CN114477331A - Treatment method of formaldehyde-containing wastewater - Google Patents
Treatment method of formaldehyde-containing wastewater Download PDFInfo
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- CN114477331A CN114477331A CN202210221463.5A CN202210221463A CN114477331A CN 114477331 A CN114477331 A CN 114477331A CN 202210221463 A CN202210221463 A CN 202210221463A CN 114477331 A CN114477331 A CN 114477331A
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- 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
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- 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
- C02F2101/34—Organic compounds containing oxygen
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Abstract
The invention discloses a method for treating wastewater containing formaldehyde, which adopts glucose and Na aiming at the defects of the method for treating high-concentration organic wastewater2SO3Jointly treating the wastewater containing formaldehyde. The invention adopts glucose and Na2SO3The method has the advantages of good environmental benefit, simple treatment method, short time, high efficiency, suitability for large-scale popularization and application, and high formaldehyde removal rate which can reach more than 98%.
Description
Technical Field
The invention belongs to the technical field of chemical industry environmental protection, and particularly relates to a treatment method of formaldehyde-containing wastewater.
Background
Formaldehyde is a micromolecular organic matter with high reaction activity, is a gas at normal temperature, has volatility and also has strong pungent smell. Formaldehyde is an organic substance which is extremely harmful to human bodies, and the formaldehyde can cause symptoms of skin allergy, red swelling, pruritus, dry eyes, congestion and the like after the human bodies contact the formaldehyde. After a certain amount of formaldehyde gas is inhaled, adverse reactions such as respiratory mucosa edema, cough, headache and the like can be caused. The long-term work and life of human body in formaldehyde environment can cause chronic poisoning, and serious patients can also cause serious consequences such as leukemia, cancer and the like.
Formaldehyde is one of the most common industrial raw materials in the pesticide industry, a large amount of formaldehyde-containing wastewater is generated in the production process, and the content of the formaldehyde is often as high as ten thousand mg/L. If the formaldehyde is not treated and directly discharged, water sources are polluted, and the formaldehyde in the wastewater is extremely easy to volatilize, so that the formaldehyde can cause serious harm to the environment and human bodies and also can cause serious economic loss to the society.
The existing treatment method of formaldehyde wastewater mainly comprises a physical method and a chemical method:
1) the physical method mainly comprises a blow-off method: the blowing-off method is characterized in that formaldehyde in production wastewater is subjected to blowing-off pretreatment by using steam by utilizing the characteristics of high water solubility, low boiling point and high volatility of the formaldehyde, so that the load of the subsequent treatment process is reduced, and the treatment effect is improved. The method has the disadvantages of high energy consumption, high equipment requirement and uneconomic operation.
2) The chemical method mainly comprises the following steps: the condensation process and the lime process. The condensation process is also called urea process. The method mainly utilizes the reaction of urea and formaldehyde under acidic condition to generate methylurea precipitate. However, this method is only suitable for formaldehyde wastewater with extremely high concentration, and cannot meet the requirement of subsequent biochemical treatment, as in the stripping method. Most of the methods are laboratory researches, and industrial application is yet to be practiced. ② the lime method is that under the condition of existence of lime, formaldehyde is converged to produce hexose. When the method is used for treating high-concentration formaldehyde wastewater, the using amount of lime is large, and meanwhile, solid waste with equal quality is generated, so that difficulty is caused for subsequent treatment.
Therefore, a method for treating formaldehyde-containing wastewater, which has simple steps and low requirements on equipment and does not generate a large amount of solid waste, is needed.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, the present invention provides a method for treating formaldehyde-containing wastewater, which uses glucose + Na to overcome the disadvantages of the method for treating high-concentration organic wastewater2SO3At the unionThe method has simple steps and low requirement on equipment, does not generate a large amount of solid waste, and can realize large-scale popularization in a short time.
In order to achieve the above objects and other related objects, the present invention provides a method for treating formaldehyde-containing wastewater, comprising the steps of adjusting the pH of the formaldehyde-containing wastewater to more than 10, adding glucose and/or an alkali metal sulfite with or without heating;
further, the method specifically comprises the following steps: adjusting the pH value of the formaldehyde-containing wastewater to be more than 10, adding glucose and/or alkali metal sulfite under the condition of heating or not, and heating or not;
still further, specifically: adjusting the pH value of the formaldehyde-containing wastewater to be more than 10, adding glucose and/or alkali metal sulfite under the condition of no heating, and heating;
further, adjusting the pH value of the formaldehyde-containing wastewater to be more than 11;
further, adjusting the pH value of the formaldehyde-containing wastewater to be more than 12;
further, the alkali metal is selected from Na or K;
still further, the alkali metal is Na;
further, the heating condition is heating to 80-95 ℃ for at least 10 minutes;
further, the heating condition is heating to 90 ℃ for 60 minutes;
further, the mass ratio of the glucose to the alkali metal sulfite is 1-5: 1-5;
still further, the mass ratio of the glucose to the alkali metal sulfite is 1: 1;
further, the adding amount of the glucose is 1-5% of the mass of the wastewater;
further, the adding amount of the glucose is 2-3% of the mass of the wastewater;
further, the adding amount of the glucose is 3% of the mass of the wastewater;
further, the adding amount of the alkali metal sulfite is 1-5% of the mass of the wastewater;
further, the adding amount of the alkali metal sulfite is 2-3% of the mass of the wastewater;
further, the adding amount of the alkali metal sulfite is 3 percent of the mass of the wastewater;
further, removing the precipitate after adjusting the pH value of the formaldehyde-containing wastewater to be more than 10;
still further, the manner of removing the precipitate includes, but is not limited to, filtration, suction filtration or centrifugation;
further, the removal rate of formaldehyde in the wastewater is more than or equal to 95.0 percent; the content of formaldehyde in the wastewater is 1000-50000 mg/L;
furthermore, the removal rate of formaldehyde in the wastewater is more than or equal to 98.0 percent;
further, when the formaldehyde content of the wastewater is 1000-20000mg/L, the adding amounts of the glucose and the alkali metal sodium sulfite are respectively 1-2% of the mass of the wastewater;
furthermore, when the formaldehyde content of the wastewater is 10000-20000mg/L, the adding amount of the glucose and the alkali metal sodium sulfite is 1-2% of the mass of the wastewater respectively;
further, when the formaldehyde content of the wastewater is 20000-30000mg/L, the adding amounts of the glucose and the alkali metal sodium sulfite are respectively 2-3% of the mass of the wastewater;
further, when the formaldehyde content of the wastewater is 30000-40000mg/L, the adding amount of the glucose and the alkali metal sodium sulfite is 3-4% of the mass of the wastewater respectively;
further, when the formaldehyde content of the wastewater is 40000-50000mg/L, the adding amount of the glucose and the alkali metal sodium sulfite is 4-5% of the mass of the wastewater respectively.
Due to the adoption of the technology, compared with the prior art, the invention has the remarkable advantages that:
1) the formaldehyde can be heated under the alkaline condition to carry out saccharification reaction, the reaction can be catalyzed by glucose, the reaction speed is improved, and the invention adopts glucose and Na2SO3The formaldehyde in the wastewater is removed in a combined manner, so that the formaldehyde removal efficiency is excellent; by taking Na alone2SO3Is only suitable for wastewater with formaldehyde concentration not more than 10000mg/L, and when the formaldehyde concentration is too high, Na is singly used2SO3The cost is very high and the effect is not satisfactory enough; where glucose is used aloneWhen high-concentration formaldehyde wastewater is treated, the removal rate of formaldehyde is not good, and even the dosage of glucose is increased, the removal rate of formaldehyde is not obviously increased;
2) the method has the advantages of low requirement on equipment, low requirement on wastewater components, easiness in reaction, no generation of solid waste, good environmental benefit, simple treatment method, short time and high efficiency, and is suitable for large-scale popularization and application;
3) the invention overcomes the problem of high cost caused by adopting a single catalyst when treating high-concentration formaldehyde wastewater in the prior art, and Na2SO3The chemical equation for the reaction with formaldehyde is: na (Na)2SO3 + HCOH + H2O = HOCH2SO3Na + NaOH. Thereby removing formaldehyde in the wastewater, reducing the toxic action of the formaldehyde in the wastewater on microorganisms and improving the removal effect of the microorganisms on organic matters in the wastewater. The removal rate of formaldehyde in the process can reach more than 98 percent.
Detailed Description
For a better understanding of the present invention, the present invention is described in further detail below with reference to specific embodiments. These examples are provided to illustrate the main reactions and essential features of the present invention, and are not limited by the following embodiments, and the implementation conditions used in the embodiments can be further adjusted according to specific requirements, and the implementation conditions not mentioned are generally the conditions in routine experiments.
The present invention will be further illustrated by the following description of examples in conjunction with the accompanying drawings.
Example 1
1) Pretreatment: adjusting the pH value of the formaldehyde wastewater to 11-12 by using NaOH, carrying out suction filtration, and removing precipitates to obtain a supernatant;
2) removing formaldehyde: the formaldehyde content in the supernatant was measured to be 27184 mg/L. Putting the wastewater into a water bath at 90 ℃, and adding 3 percent (mass ratio) of glucose and 3 percent (mass ratio) of Na simultaneously in the stirring process2SO3. After the reaction is carried out for 60min, the formaldehyde in the wastewater is reduced from 27184mg/L to 491mg/L, the formaldehyde removal rate is 98.19 percent, the treated water sample is distilled, and the formaldehyde concentration in the fraction is further reduced to 304 mg/bambooL, the removal rate reaches 98.89%.
Example 2
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 21261mg/L, firstly, adjusting the pH of the wastewater to 11-12 by using NaOH;
2) removing formaldehyde: adding 2% glucose and 2% Na simultaneously2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 21261mg/L to 201mg/L, and the formaldehyde removal rate is 99.05%.
Example 3
1) Pretreatment: taking industrial formaldehyde wastewater, regulating the pH of the wastewater to 11-12 by using NaOH, wherein the measured formaldehyde concentration is 24193 mg/L;
2) removing formaldehyde: adding 2% glucose and 2% Na2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 24193mg/L to 356mg/L, and the formaldehyde removal rate is 98.53%.
Example 4
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 45322mg/L, firstly, adjusting the pH of the wastewater to 11-12 by using NaOH;
2) removing formaldehyde: adding 4% glucose and 4% Na simultaneously2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 45322mg/L to 811mg/L, and the formaldehyde removal rate is 98.21%.
Example 5
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 6483mg/L, firstly, adjusting the pH of the wastewater to 11-12 by using NaOH;
2) removing formaldehyde: adding 1% glucose and 1% Na simultaneously2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 6483mg/L to 189mg/L, and the formaldehyde removal rate is 97.08%.
Example 6
1) Pretreatment: treating formaldehyde wastewater with the concentration of 13725mg/L, firstly, adjusting the pH of the wastewater to 11-12 by NaOH;
2) removing formaldehyde: adding 5% glucose, and reacting at 90 deg.C for 60 min. The formaldehyde in the wastewater is reduced from 13725mg/L to 6786mg/L, and the removal rate of the formaldehyde is 50.56%.
Example 7
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 12279mg/L, firstly, adjusting the pH of the wastewater to 11-12 by using NaOH;
2) removing formaldehyde: adding 5% Na2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 12279mg/L to 8539mg/L, and the formaldehyde removal rate is 30.45%.
Example 8
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 31261 mg/L;
2) removing formaldehyde: adding 5% glucose and 5% Na2SO3And reacting at 90 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 31261mg/L to 24214mg/L, and the formaldehyde removal rate is 22.54%.
Example 9
1) Pretreatment: treating formaldehyde wastewater with the formaldehyde concentration of 34697mg/L, firstly, adjusting the pH of the wastewater to 11-12 by using NaOH;
2) removing formaldehyde: adding 5% glucose and 5% Na simultaneously2SO3And reacting at 75 ℃ for 60 min. The formaldehyde in the wastewater is reduced from 34679mg/L to 12120mg/L, and the removal rate of the formaldehyde is 65.05 percent.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, and equivalents including technical features of the claims, i.e., equivalent modifications within the scope of the present invention.
Claims (10)
1. A method for treating formaldehyde-containing wastewater, which is characterized by comprising the steps of adjusting the pH of the formaldehyde-containing wastewater to be more than 10 and adding glucose and/or alkali metal sulfite with or without heating.
2. The process according to claim 1, wherein the pH of the formaldehyde-containing waste water is adjusted to a value of more than 11.
3. The treatment method according to claim 1, wherein the alkali metal is selected from Na or K.
4. The process according to claim 1, wherein the heating conditions are a heating to a temperature of 80 to 95 ℃ for a period of at least 10 minutes.
5. The treatment method according to claim 1, wherein the glucose is added in an amount of 1 to 5% by mass based on the mass of the wastewater.
6. The process according to claim 5, wherein the glucose is added in an amount of 2 to 3% by mass based on the mass of the wastewater.
7. The treatment method according to claim 1, wherein the alkali metal sulfite is added in an amount of 1 to 5% by mass based on the mass of the wastewater.
8. The treatment method according to claim 7, wherein the alkali metal sulfite is added in an amount of 2 to 3% by mass based on the mass of the wastewater.
9. The process according to claim 1, wherein the precipitate is removed after the pH of the formaldehyde-containing wastewater is adjusted to a value of more than 10.
10. The treatment method according to claim 1, wherein the removal rate of formaldehyde in the wastewater is 95.0% or more; the content of formaldehyde in the wastewater is 1000-50000 mg/L.
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| CN202210221463.5A CN114477331A (en) | 2022-03-09 | 2022-03-09 | Treatment method of formaldehyde-containing wastewater |
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| CN202210221463.5A CN114477331A (en) | 2022-03-09 | 2022-03-09 | Treatment method of formaldehyde-containing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117701902A (en) * | 2023-12-08 | 2024-03-15 | 江铜国兴(烟台)铜业有限公司 | Treatment process of silver reduced liquid in copper anode slime wet smelting |
Citations (5)
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|---|---|---|---|---|
| GB1377806A (en) * | 1971-02-27 | 1974-12-18 | Asahi Chemical Ind | Process for treating aldehyde-containing gases or solutions |
| CN101830604A (en) * | 2010-05-13 | 2010-09-15 | 同济大学 | Method for treating high-concentration formaldehyde wastewater by using waste alkali |
| CN102515384A (en) * | 2011-11-24 | 2012-06-27 | 重庆锐致环保科技有限公司 | Technology for turning wastewater of melamine resin production into resource |
| WO2013146852A1 (en) * | 2012-03-29 | 2013-10-03 | 栗田工業株式会社 | Method for membrane-treating formaldehyde-containing discharge water |
| CN107879502A (en) * | 2017-10-18 | 2018-04-06 | 江苏蓝必盛化工环保股份有限公司 | A kind of processing method of formaldehyde waste water |
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Patent Citations (5)
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|---|---|---|---|---|
| GB1377806A (en) * | 1971-02-27 | 1974-12-18 | Asahi Chemical Ind | Process for treating aldehyde-containing gases or solutions |
| CN101830604A (en) * | 2010-05-13 | 2010-09-15 | 同济大学 | Method for treating high-concentration formaldehyde wastewater by using waste alkali |
| CN102515384A (en) * | 2011-11-24 | 2012-06-27 | 重庆锐致环保科技有限公司 | Technology for turning wastewater of melamine resin production into resource |
| WO2013146852A1 (en) * | 2012-03-29 | 2013-10-03 | 栗田工業株式会社 | Method for membrane-treating formaldehyde-containing discharge water |
| CN107879502A (en) * | 2017-10-18 | 2018-04-06 | 江苏蓝必盛化工环保股份有限公司 | A kind of processing method of formaldehyde waste water |
Non-Patent Citations (2)
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| 辛坤等: "甲醛合成乙醇醛研究及其应用进展", 天然气化工(C1化学与化工), vol. 41, no. 05, pages 88 - 94 * |
| 黄俊逸: "DMBA(2, 2-二羟甲基丁酸)生产废水处理的应用研究", 中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑, no. 12, pages 027 - 792 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117701902A (en) * | 2023-12-08 | 2024-03-15 | 江铜国兴(烟台)铜业有限公司 | Treatment process of silver reduced liquid in copper anode slime wet smelting |
| CN117701902B (en) * | 2023-12-08 | 2025-09-30 | 江铜国兴(烟台)铜业有限公司 | A process for treating silver reduction liquid in copper anode mud hydrometallurgy |
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