CN110947357B - Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof - Google Patents
Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof Download PDFInfo
- Publication number
- CN110947357B CN110947357B CN201911332877.XA CN201911332877A CN110947357B CN 110947357 B CN110947357 B CN 110947357B CN 201911332877 A CN201911332877 A CN 201911332877A CN 110947357 B CN110947357 B CN 110947357B
- Authority
- CN
- China
- Prior art keywords
- ceramsite
- iron
- ferrous
- column
- rich
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 120
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052742 iron Inorganic materials 0.000 claims abstract description 60
- 241000894006 Bacteria Species 0.000 claims abstract description 38
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000003647 oxidation Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 239000011159 matrix material Substances 0.000 claims abstract description 20
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 13
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 7
- 125000003703 phosphorus containing inorganic group Chemical group 0.000 claims abstract 2
- 238000004090 dissolution Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 230000003068 static effect Effects 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims 2
- 229910002651 NO3 Inorganic materials 0.000 claims 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 12
- 239000011574 phosphorus Substances 0.000 abstract description 12
- 239000003344 environmental pollutant Substances 0.000 abstract description 9
- 231100000719 pollutant Toxicity 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000005447 environmental material Substances 0.000 abstract description 2
- 238000003795 desorption Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 33
- 239000000243 solution Substances 0.000 description 32
- 235000013980 iron oxide Nutrition 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000001939 inductive effect Effects 0.000 description 8
- 238000002386 leaching Methods 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 230000001580 bacterial effect Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 5
- 235000017557 sodium bicarbonate Nutrition 0.000 description 5
- 235000010344 sodium nitrate Nutrition 0.000 description 5
- 239000004317 sodium nitrate Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000012295 chemical reaction liquid Substances 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000006053 organic reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000000705 flame atomic absorption spectrometry Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000033444 hydroxylation Effects 0.000 description 1
- 238000005805 hydroxylation reaction Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention belongs to the technical field of environmental materials, and discloses a method for improving the adsorption performance of ceramsite, modified ceramsite and application thereof. The method comprises the following steps: reducing ferric iron in the iron-rich matrix into ferrous iron by adopting dissimilatory iron reducing bacteria in a solution containing organic matters to obtain water containing the ferrous iron; and (3) introducing the ferrous water and the solution rich in nitrate nitrogen into the ceramsite inoculated with the ferrous oxidation denitrifying bacteria, and carrying out oxidation treatment to obtain the modified ceramsite. The method is simple, low in energy consumption and low in cost; the adsorption removal rate of the modified ceramsite to pollutants such as phosphorus, cadmium and the like can reach more than 90 percent, which is far higher than that of the original ceramsite which is not strengthened, and the adsorption effect is relatively quick and stable, and the desorption is not easy. The modified ceramsite is used for removing phosphorus-containing inorganic matters and/or cadmium-containing heavy metals in sewage.
Description
Technical Field
The invention belongs to the field of preparation of environmental materials, and particularly relates to a method for improving the adsorption performance of ceramsite, modified ceramsite and application thereof.
Background
The ceramsite is an artificial lightweight aggregate which is formed by sintering solid waste or clay and the like serving as raw materials, has the characteristics of heat resistance, light weight, good thermal shock resistance and the like, and is a common building material. In recent years, ceramsite is gradually researched and applied to the field of sewage treatment, and has the characteristics of high specific surface area, large porosity, strong chemical stability and the like, so that the ceramsite is very suitable for being used as a filter or artificial wetland filler to remove pollutants such as phosphorus, heavy metals and the like in water through filtration or adsorption. However, as the raw materials are various, the ceramsite products on the market have different adsorption performances, the pollutant adsorption and removal effect is unstable, and the adsorption performance needs to be improved through certain modification treatment before use.
The iron oxide particles have the property of easy surface hydroxylation in an aqueous solution, so that the iron oxide particles have the characteristics of ampholytes, namely, the surfaces of solutions with different pH values can carry different charges, and in addition, the iron oxide particles also have higher specific surface area, so that the iron oxide particles have better adsorption effect on various ionic pollutants. The iron oxide is loaded on the surface of the ceramsite, so that the adsorption performance of the ceramsite can be greatly improved, and the ferric iron is attached to the surface of the ceramsite mainly by a physical and chemical method. The method mainly utilizes the measures of settling ferric ions under the alkaline condition, combining high-temperature calcination and the like to lead the iron oxide to be adhered and fixed on the surface of the ceramsite, and has the advantages of larger energy consumption and higher investment in the preparation process and certain safety risk. The invention provides a method for loading iron oxide driven by microorganisms on the surface of ceramsite based on the migration and transformation effects of the microorganisms on the iron oxide, and a cheap iron-rich material is used as an iron source, so that the method is safer and more economical.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for improving the adsorption performance of ceramsite, which is used for biologically modifying the interior and the surface of the ceramsite and improving the treatment effect of the ceramsite on various pollutants in water.
The invention also aims to provide the modified ceramsite obtained by the method.
The invention also aims to provide application of the modified ceramsite.
The present invention is realized by the following technical means.
A method for improving the adsorption performance of ceramsite comprises the following steps:
reducing ferric iron in the iron-rich matrix into ferrous iron by adopting dissimilatory iron reducing bacteria in a solution containing organic matters to obtain water containing the ferrous iron; and (3) introducing the ferrous water and the solution rich in nitrate nitrogen into the ceramsite inoculated with the ferrous oxidation denitrifying bacteria, and carrying out oxidation treatment to obtain the modified ceramsite.
The content of ferrous iron in the ferrous iron-containing water is more than 80mg/L, and the pH value is maintained at 6-7.
COD in the solution containing the organic matters is 1000-2000 mg/L. The pH of the organic-substance-containing solution is 4-6.
Nitrate Nitrogen (NO) in the nitrate nitrogen-rich solution3-N) concentration of 60-120 mg/L, bicarbonate radical (HCO)3 -) The concentration is 1680-3360 mg/L.
When the iron content in the modified ceramsite is at least 5.17 +/-0.25 g/kg, the oxidation treatment is completed.
The ferric iron is reduced into ferrous iron to be carried out in a ferrous iron dissolution column, an iron-rich matrix is filled in the ferrous iron dissolution column, and dissimilatory iron reducing bacteria are inoculated on the iron-rich matrix. The height of the iron-rich matrix layer in the ferrous iron leaching column is 24-30 cm. The upper layer and the lower layer of the iron-rich matrix layer are large-particle-size crushed stone layers. The lower end of the ferrous iron dissolving column is provided with a water inlet, and the upper end is provided with a water outlet. The iron-rich substrate is inoculated with dissimilatory iron-reducing bacteria, and the dosage of the iron-rich substrate and the dissimilatory iron-reducing bacteria meets the requirement that 100-1000 mL of dissimilatory iron-reducing bacteria liquid is inoculated into 8-10 kg of the iron-rich substrate. The dissimilatory iron reducing bacteria liquid is obtained by enriching from the bottom mud of the paddy soil or the river.
Inoculating dissimilatory iron reducing bacteria on the iron-rich substrate, and introducing a solution containing organic matters for standing culture; the time for the static culture was 1 week.
The oxidation treatment is carried out in a ceramsite column, ceramsite is filled in the ceramsite column, and the ceramsite is inoculated with ferrous oxide denitrifying bacteria. The height of the ceramsite layer in the ceramsite column is 37-42 cm. The upper and lower parts of the ceramic particle layer are provided with large-particle-size crushed stone layers. The lower end of the ceramsite column is provided with two water inlets, and the upper end is provided with a water outlet. The ceramsite is inoculated with ferrous oxide denitrifying bacteria, and the dosage of the ceramsite and the denitrifying bacteria meets the requirement that 100-1000 mL of denitrifying bacteria liquid is inoculated into 3-6 kg of ceramsite.
Inoculating ferrous oxide denitrifying bacteria on the ceramsite, and then introducing a solution rich in nitrate nitrogen for standing culture; the time for the static culture was 1 week.
The ferrous iron dissolving-out column is connected with the ceramsite column in series, and ferrous iron-containing water and a nitrate nitrogen-rich solution in the ferrous iron dissolving-out column are respectively introduced into the ceramsite column from two water inlets on the ceramsite column. When ferric iron is reduced into ferrous iron, the solution containing organic matters is continuously introduced into a ferrous iron dissolution column; during the oxidation treatment, ferrous-containing water and a nitrate nitrogen-rich solution in the ferrous iron dissolution column are respectively and continuously introduced into the ceramsite column from two water inlets on the ceramsite column.
When the ferric iron is reduced into ferrous iron, the flow rate of the solution containing the organic matters is 3-5 mL/min; the flow rate of the solution rich in nitrate nitrogen during the oxidation treatment is 3-6 mL/min.
In the oxidation treatment process, the effluent of the ceramsite column meets the condition that the ferrous concentration is maintained below 6 mg/L.
When the ferrous iron in the effluent of the ferrous iron dissolution column is continuously lower than 50mg/L, the iron-rich matrix in the column can be replaced, and the sufficient ferrous iron input of the ceramsite column is ensured; when the concentration of the ferrous iron in the effluent of the ceramsite column is continuously higher than 10mg/L or the pH value of the effluent cannot be maintained above 7, the use amounts of the sodium bicarbonate and the sodium nitrate in the nitrate nitrogen reaction liquid are increased so as to ensure that the ceramsite column can carry out the iron oxide attachment process at the maximum reaction efficiency. Periodically taking out the ceramsite, monitoring the iron content of the ceramsite by using a hydrochloric acid leaching method, stopping the reaction system when the iron content at least reaches 5.17 +/-0.25 g/kg, taking out the ceramsite in the ceramsite column, namely the reinforced ceramsite with improved adsorption performance, and storing the reinforced ceramsite after air-drying.
A modified ceramsite is obtained by the method.
The modified ceramsite is used for removing inorganic matters and/or heavy metals and the like in sewage, and particularly removing phosphorus and cadmium in the sewage.
Compared with the prior art, the invention has the following advantages and effects:
(1) the iron oxide reinforced ceramsite has a good adsorption effect on pollutants such as inorganic matters, heavy metals and the like in sewage, and is suitable for advanced treatment of sewage.
(2) The method has simple, convenient and safe strengthening process of the ceramsite, and the obtained iron oxide strengthened ceramsite is easy to store.
(3) The adsorption removal rate of the reinforced ceramsite prepared by the method for preparing the reinforced ceramsite to pollutants such as phosphorus, cadmium and the like can reach more than 90 percent, and is far higher than that of the original ceramsite which is not reinforced.
(4) The adsorbent prepared by the invention has a quick and stable adsorption effect and is not easy to desorb.
(5) The preparation process of the adsorbent has less economic investment and lower cost than the common low-concentration heavy metal sewage treatment method (membrane treatment technology).
Drawings
FIG. 1 is a schematic view of an apparatus used in the method for improving the adsorption performance of ceramsite according to the invention;
FIG. 2 is a graph showing the phosphorus adsorption removal rate of the modified ceramsite (reinforced ceramsite) according to the present invention;
FIG. 3 is a graph showing the change of the removal rate of cadmium adsorption by the modified ceramsite (reinforced ceramsite) according to the present invention with time.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto. The iron dissimilatory reducing bacteria enriched bacterial liquid can be obtained by enrichment from rice soil or river bottom mud (100 g of air-dried rice soil (rice soil of test base of southern agricultural university, south China) is taken, 500mL of distilled water is added, after full stirring, a preservative film is used for sealing, a 30 ℃ culture box is used for standing culture for 24h, and supernatant is taken as an inoculation bacterial liquid); the enriched bacterial liquid of the ferrous oxidation denitrifying bacteria can be obtained from the enrichment of soil or river bottom mud. The iron-rich matrix can be selected from red soil, brick red soil, iron ore and other materials containing easily reducible iron oxides.
The iron reduction inducing solution is rich in easily degradable organic matters, can contain ammonia nitrogen and phosphorus, can be prepared by adopting compounds such as glucose, starch and the like, and can also use organic wastewater with corresponding characteristics, such as starch production wastewater; the COD of the solution is 1000-2000 mg/L.
Ferrous oxidation solution, solution rich in nitrate nitrogen and having certain pH buffering capacity, can be prepared from sodium nitrate and sodium bicarbonate, nitrate Nitrogen (NO)3-N) concentration of 60-120 mg/L, bicarbonate radical (HCO)3 -) The concentration is kept between 1680 and 3360 mg/L.
FIG. 1 is a schematic view of the apparatus used in the method for improving the adsorption performance of ceramsite according to the present invention. The device adopted by the method comprises a ferrous iron dissolving-out column and a ceramsite column, wherein the lower end and the upper end of the ferrous iron dissolving-out column are respectively provided with a water inlet and a water outlet, the lower end of the ceramsite column is provided with two water inlets, and the upper end of the ceramsite column is provided with a water outlet; the water outlet of the ferrous iron dissolving column is connected with a water inlet of the ceramsite column, and a solution (organic reaction solution) containing organic matters enters the ferrous iron dissolving column from the water inlet of the ferrous iron dissolving column through a pump; the solution containing nitrate nitrogen enters the ceramsite column from the other water inlet of the ceramsite column through the pump, and the effluent of the ceramsite column flows out from the water outlet.
A bearing layer, an iron-rich matrix layer and a covering layer are respectively arranged in the ferrous iron leaching column from bottom to top, a water inlet is positioned at the bearing layer, and a water outlet is positioned at the covering layer; the ceramsite column is provided with a bearing layer, a ceramsite layer and a covering layer from bottom to top respectively, the water inlet is positioned at the bearing layer, and the water outlet is positioned at the covering layer.
The organic reaction liquid enters the ferrous dissolution column from a water inlet of the ferrous dissolution column through a pump, flows out from a water outlet through the reaction of dissimilatory iron reducing bacteria of the iron-rich matrix layer, then enters the ceramsite column from a water inlet of the ceramsite column, and simultaneously enters the ceramsite column from another water inlet of the reaction liquid of nitrate nitrogen, and flows out from a water outlet of the ceramsite column under the action of denitrifying bacteria in the ceramsite column.
Example 1 construction of reaction System
(1) Constructing a system: the reaction column material is a PVC circular tube and is divided into a ferrous iron dissolution column with the height of 52cm and a filler column (ceramsite column) with the height of 67cm, iron-rich soil widely distributed in the south China is used as an iron supply source (iron-rich matrix layer) of the system in the ferrous iron dissolution column, and ceramsite with the particle size of 1-2cm to be modified is arranged in the filler column (ceramsite column), so that the adsorption performance is poor;
the ferrous iron leaching column is respectively provided with a lower water inlet and an upper water outlet at positions 4.5cm and 40cm away from the bottom of the side edge, wherein the lower water inlet is used for inputting an iron reduction inducing liquid (solution containing organic matters) into the ferrous iron leaching column, and the upper water outlet is used for outputting water containing ferrous iron to a filler column (ceramsite column); paving broken stones as bearing layers at the bottom and the uppermost part of the interior of the column, wherein the height is 5cm, and the middle part is filled with a 24cm iron-rich matrix layer; the packing column is respectively provided with a water outlet at a position 56cm away from the bottom of the side edge, and two water inlets with opposite positions, namely a water inlet A and a water inlet B, are arranged at a position 4.5cm away from the bottom of the packing column, wherein the water inlet A is connected with the upper water outlet of the ferrous iron dissolution column through a silicone tube and is used for inputting ferrous iron into the packing column, and the water inlet B is used for inputting a ferrous iron oxidation solution (a solution rich in nitrate nitrogen); paving a crushed stone bearing layer with the height of 5cm on the bottom and the upper part in the ceramsite column, and filling a ceramsite layer with the height of 42cm in the middle;
inoculating dissimilatory iron reducing bacteria in an iron-rich matrix layer of the ferrous dissolution column as a reaction strain (inoculating 1000mL of iron dissimilatory iron reducing bacteria enriched bacterial liquid in 10kg of iron-rich matrix), and inoculating ferrous oxidation denitrifying bacteria in a ceramsite layer of the packed column (ceramsite column) as a reaction strain (inoculating 1000mL of denitrifying bacteria in 5kg of ceramsite);
(2) preparing a reaction solution: the iron reduction inducing liquid is prepared from glucose and tap water, wherein the COD concentration is 1600-2000 mg/L, and the iron reduction inducing liquid is used for inducing the reduction reaction of the dissimilatory iron in the ferrous iron dissolving-out column; the ferrous oxidation solution is prepared by sodium nitrate, sodium bicarbonate and tap water, wherein NO is3HCO with-N concentration of 60-120 mg/L3 -The concentration is 3360mg/L, sodium nitrate is used for providing an electron acceptor of the ferrous oxidation denitrifying bacteria, and sodium bicarbonate is used for buffering the acidity and alkalinity of the solution in the packed column;
(3) respectively introducing an iron reduction inducing liquid and a ferrous oxidation solution into the ferrous dissolution column and the ceramsite column to submerge the filler in the column, and standing and culturing for a week; then, starting continuous operation, and starting the preparation process of the modified ceramsite; introducing an iron reduction inducing liquid from a water inlet at the lower part of the ferrous dissolution column (the flow rate of the iron reduction inducing liquid is 4mL/min), reducing ferric iron in the iron-rich matrix into ferrous ions by organic matters under the action of dissimilatory iron reducing bacteria, enabling effluent to flow out from a water outlet at the upper part with the ferrous ions, then enabling the effluent and ferrous oxidation solution (the flow rate of the ferrous oxidation solution is 5mL/min) to enter the ceramsite column from the water inlet at the lower part, oxidizing the ferrous iron into ferric iron by nitrate nitrogen under the action of ferrous oxidation denitrifying bacteria, forming fine particles and organic matters such as bacterial thallus or secreted viscous polysaccharide and the like to be adhered to the surface of the ceramsite, reducing the nitrate nitrogen into nitrogen, and discharging effluent from an outlet at the upper part of the ceramsite column; during the operation of the system, the ferrous leaching amount of the ferrous leaching column is kept above 80mg/L and the pH of effluent is kept between 6 and 7 by adjusting the load of organic matters; the ferrous iron in the effluent of the ceramsite column is maintained below 6mg/L by adjusting the concentration of nitrate nitrogen and sodium bicarbonate in the ferrous oxidation solution to ensure that most of the ferrous iron entering the ceramsite column is oxidized and settled;
(4) monitoring of the reaction system: in the running period, the ferrous concentration difference of inlet and outlet water of the ceramsite column, the pH value of outlet water, the particle porosity, the iron oxide deposition amount of a unit bed body and the like are used as evaluation indexes; when the ferrous iron in the effluent of the ferrous iron dissolution column is continuously lower than 50mg/L, the iron-rich matrix in the column can be replaced, and the sufficient ferrous iron input of the ceramsite column is ensured; when the concentration of the ferrous iron in the effluent of the ceramsite column is continuously higher than 10mg/L or the pH value of the effluent cannot be maintained above 7, the use amounts of the sodium bicarbonate and the sodium nitrate in the nitrate nitrogen reaction liquid are increased so as to ensure that the ceramsite column can carry out the iron oxide attachment process at the maximum reaction efficiency. Periodically taking out the ceramsite, monitoring the iron content of the ceramsite by using a hydrochloric acid leaching method, and stopping a reaction system when the iron content at least reaches 5.17 +/-0.25 g/kg;
(5) collecting modified ceramsite: and after the reaction system is stopped, taking out the ceramsite in the packed column, namely the modified ceramsite with improved adsorption performance, and storing the modified ceramsite after air drying.
Example 2 adsorption of phosphorus and cadmium by modified Haydite
And respectively measuring the adsorption performance of the modified ceramsite on phosphorus and cadmium in water through a static adsorption experiment. A150 mL conical flask is used as an adsorption device, and phosphorus and cadmium reaction solutions are prepared according to the primary discharge standard of pollutant discharge Standard of urban wastewater and Sewage treatment plant (GB18918-2002) and the water pollution discharge limit of newly-built enterprises in the discharge Standard of electroplating pollutants (GB 21900-2008). Respectively testing the adsorption removal performance of the original ceramsite and the modified ceramsite (the total iron content of the modified ceramsite in example 1 is 93.1-103 mg/g), wherein the solid-liquid ratio is 5: 100 (mass ratio), oscillating for 24 hours at the constant temperature of 25 ℃, 150r/min and the pH value of 7, determining the residual Total Phosphorus (TP) and Cd in the solution, wherein the TP is determined by adopting a molybdate colorimetric method, and the heavy metal Cd is determined by adopting a flame Atomic Absorption Spectrometry (AAS) machine. The experimental result shows that the adsorption removal rate of the modified ceramsite to phosphorus is improved by more than 80% (figure 2). The adsorption removal rate of cadmium is improved by more than 30 percent (figure 3), adsorption kinetics experiments show that the adsorption rate of the modified ceramsite to cadmium is far higher than that of the original ceramsite, and the maximum adsorption removal rate can be achieved within 10 minutes (figure 3).
FIG. 2 is a graph showing the phosphorus adsorption removal rate of the modified ceramsite (reinforced ceramsite) according to the present invention; FIG. 3 is a graph showing the change of the removal rate of cadmium adsorption by the modified ceramsite (reinforced ceramsite) according to the present invention with time.
In fig. 2, the original ceramsite removal rate is 2.61 ± 2.26%, and the modified ceramsite (reinforced ceramsite) removal rate is 82.30 ± 2.26%). In the adsorption experiment of cadmium in fig. 3, samples are taken and measured for 0min, 10min, 30min, 1h, 5h, 12h and 24h, and the adsorption removal rate of the original ceramsite is 62.22 +/-4.80% at 24h, and the adsorption removal rate of the modified ceramsite is 94.81 +/-0.34%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332877.XA CN110947357B (en) | 2019-12-20 | 2019-12-20 | Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332877.XA CN110947357B (en) | 2019-12-20 | 2019-12-20 | Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110947357A CN110947357A (en) | 2020-04-03 |
| CN110947357B true CN110947357B (en) | 2021-11-26 |
Family
ID=69983421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911332877.XA Active CN110947357B (en) | 2019-12-20 | 2019-12-20 | Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110947357B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106083B (en) * | 2021-04-15 | 2022-06-21 | 浙江大学 | Cadmium-reducing biologically modified ceramsite and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803703A (en) * | 2014-02-25 | 2014-05-21 | 合肥工业大学 | Method for simultaneously removing phosphorous and nitrogen through synergistic effect of nanoscale-iron and microbes |
| CN106914224A (en) * | 2015-12-24 | 2017-07-04 | 华南农业大学 | A kind of biological source ferriferous oxide adsorbent and preparation method and application |
| CN108816178A (en) * | 2018-06-07 | 2018-11-16 | 暨南大学 | A kind of porous ceramic grain and preparation method loading nano-iron oxide |
| CN109126733A (en) * | 2018-09-29 | 2019-01-04 | 哈尔滨工业大学（深圳） | It is a kind of for adsorbing the preparation method of the modification haydite composite filling of pollutant |
| CN110280127A (en) * | 2019-06-21 | 2019-09-27 | 深圳职业技术学院 | A kind of method of biologic packing material and preparation method thereof and processing VOCs |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2925964C (en) * | 2013-10-04 | 2023-06-13 | Bioteq Environmental Technologies Inc. | Removal of dissolved selenium from aqueous solutions |
-
2019
- 2019-12-20 CN CN201911332877.XA patent/CN110947357B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803703A (en) * | 2014-02-25 | 2014-05-21 | 合肥工业大学 | Method for simultaneously removing phosphorous and nitrogen through synergistic effect of nanoscale-iron and microbes |
| CN106914224A (en) * | 2015-12-24 | 2017-07-04 | 华南农业大学 | A kind of biological source ferriferous oxide adsorbent and preparation method and application |
| CN108816178A (en) * | 2018-06-07 | 2018-11-16 | 暨南大学 | A kind of porous ceramic grain and preparation method loading nano-iron oxide |
| CN109126733A (en) * | 2018-09-29 | 2019-01-04 | 哈尔滨工业大学（深圳） | It is a kind of for adsorbing the preparation method of the modification haydite composite filling of pollutant |
| CN110280127A (en) * | 2019-06-21 | 2019-09-27 | 深圳职业技术学院 | A kind of method of biologic packing material and preparation method thereof and processing VOCs |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110947357A (en) | 2020-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107540094B (en) | Constructed wetland sewage treatment system | |
| CN104071945B (en) | A kind of processing unit and its method of mine heavy-metal acid waste water | |
| CN104150592B (en) | A kind of burnt pyrite that utilizes is as the method for filtrate deeply treating wastewater | |
| CN105776506A (en) | Fe/C composite porous structure material as well as preparation method and application thereof | |
| CN105126749A (en) | Domestic sludge-based charcoal preparation method, and application of charcoal | |
| CN101920191A (en) | A kind of activated carbon modified material and its application in removing arsenic from water | |
| CN109206148B (en) | Preparation method and application of ceramsite | |
| Nie et al. | Composite functional particle enhanced gravity driven ceramic membrane bioreactor for simultaneous removal of nitrogen and phosphorus from groundwater | |
| CN111097374A (en) | Preparation method of oxygen-carrying + adsorption composite functional material and its application in water body remediation | |
| CN106986501B (en) | Method and device for treating sewage by coupling electric osmosis reaction wall and constructed wetland | |
| CN104192976B (en) | The method of total nitrogen/total phosphorus/heavy metal is gushed in a kind of Zero-valent Iron process river | |
| Feng et al. | Production of sorption functional media (SFM) from clinoptilolite tailings and its performance investigation in a biological aerated filter (BAF) reactor | |
| CN106180140B (en) | A kind of minimizing technology of Heavy Metal Pollution in Municipal Solid Waste object | |
| Dashti et al. | Calcined limestone horizontal roughing filter for treatment of palm oil mill effluent polishing pond | |
| CN110947357B (en) | Method for improving adsorption performance of ceramsite, modified ceramsite and application thereof | |
| CN114605032A (en) | Reinforced composite ecological filter bed for treating low-pollution mine water | |
| CN103848495A (en) | Application of copper-adsorbed fly ash ceramsite | |
| CN102500325A (en) | Preparation method of adsorption material for hexavalent chromium wastewater treatment | |
| Hong et al. | Enhancement of nitrate removal in synthetic groundwater using wheat rice stone | |
| CN103193363A (en) | Device and method for biologically treating cadmium in wastewater | |
| CN110575812B (en) | Environment-friendly adsorbing material for efficient phosphorus removal of argil/pyrolusite and preparation method thereof | |
| Ren et al. | Optimization of four kinds of constructed wetlands substrate combination treating domestic sewage | |
| CN202849197U (en) | Deep purification and combined denitrification system for polluted ground water | |
| CN102531140B (en) | Method for using Bacillus mucitaginosus to treat mercury-containing waste water | |
| CN116924605A (en) | Mine acid wastewater ecological treatment system and treatment method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |