CN106734046A - A kind of coking sludge method for innocent treatment - Google Patents

Abstract

The invention discloses a harmless treatment method for coking sludge. The specific process of this method is as follows: the coking sludge is placed in a container, the functional material modified cyclodextrin is wrapped in a filter screen, placed in the coking sludge, and the coking sludge is stirred to make the two contact, To achieve the purpose of harmless treatment. The present invention uses modified cyclodextrin to treat coking sludge for the first time, and the concentration of organic pollutants such as benzene and phenol organic pollutants in the coking sludge treated by modified cyclodextrin is reduced from 50000mg/L to 20mg/L ; The content of heavy metal ions (Cr, Ni plasma) is reduced from 10000mg/L to 10mg/L; effectively removes the odor of coking sludge; this kind of modified cyclodextrin can also be regenerated, and can treat coking sludge The cost is reduced from 0.5-20,000 yuan/ton of sludge to less than 0.5 million yuan/ton of sludge; the harmless treated coking sludge can be reused as resources; the impact of coking sludge on the environment is reduced and reduced Pollution, to avoid secondary pollution in the process of processing.

Description

A method for harmless treatment of coking sludge

technical field

The invention belongs to the field of environmental chemical industry, in particular to a harmless treatment method of coking sludge.

Background technique

Coking wastewater treatment is a difficult problem in the coking industry. The composition of coking wastewater is complex, and there are more than 100 harmful substances that can be detected. The treated coking wastewater is discharged, and the remaining sludge has no treatment measures. After analysis, it is found that the coking sludge contains pollutants such as benzene, phenols, and polycyclic aromatic hydrocarbons, as well as a variety of heavy metal ions and metal oxides. It undergoes harmless treatment to reduce or remove its pollutants. At present, coking sludge is often sent to coal yards for combustion or coking without any harmless treatment. In this way, the pollutants continue to remain in the sludge, causing secondary pollution and causing great pollution to the environment. Zhou Yuqing et al. (Chemical Reaction Engineering and Technology, 2011, 27(5):477-480) mentioned in the article "Treatment of Phenol Wastewater with New Cross-linked β-cyclodextrin" that the regeneration adsorption rate of cross-linked cyclodextrin reached More than 88%, this regenerative adsorption is under the condition that the loss amount is constantly replenished. The article does not mention the loss of cross-linked β-cyclodextrin in the adsorption and regeneration process, and how to solve this loss. Wang Haijun et al. (Bioprocessing, 2013, 11(6): 82-85) found in "HDI-modified β-cyclodextrin and its coking wastewater treatment" that the adsorption performance of HDI-β-CD can be regenerated and regenerated The adsorption rate was still 58.1% after 10 times, and the mass loss of HDI-β-CD during use was not studied. Li Zhongjin et al. (Fine Chemical Industry, 2010, 27(7): 692-695) used epichlorohydrin as a crosslinking agent in "Synthesis and Characterization of β-cyclodextrin Polymer Microspheres" and synthesized by inverse emulsion method β-cyclodextrin polymer microspheres with a particle size of 10 μm were studied, but their application and regeneration were not studied.

Contents of the invention

In order to solve the harmless treatment of coking sludge, the present invention provides a method for harmless treatment of coking sludge, specifically using self-made modified cyclodextrin (see patent CN 201410639016.7 for the specific preparation method), allowing it to be compared with After the coking sludge is fully mixed, it will be treated innocuously. In order to reduce the pollution of coking sludge to the environment, the coking sludge will be reused after harmless treatment.

To achieve the above object, the present invention adopts the following technical solutions:

The coking sludge is placed in the container, and the functional material modified cyclodextrin is wrapped in the filter screen, placed in the coking sludge, and the coking sludge is stirred to make the two contact to achieve the purpose of harmless treatment.

Specific steps are as follows:

A Dry the prepared modified cyclodextrin in vacuum drying above 50°C for 24-32 hours;

B Add a certain amount of coking sludge into the container;

C Wrap the modified cyclodextrin in the filter screen;

D Place the modified cyclodextrin in the filter in the coking sludge;

E Stir the coking sludge.

Preferably, in step B, the sludge may be coking sludge, or sludge after treatment of other industrial wastewater.

The modified cyclodextrin of the invention not only has adsorption effect on benzene and phenol organic pollutants in sludge, but also has better removal effect on heavy metal ions.

The beneficial effects of the present invention are:

1. The present invention uses modified cyclodextrin to treat coking sludge for the first time, and the concentration of organic pollutants such as benzene and phenol organic pollutants in the coking sludge treated by modified cyclodextrin is reduced from 50000mg/L to 20mg /L;

2. The content of heavy metal ions (Cr, Ni plasma) is reduced from 10000mg/L to 10mg/L;

3. Effectively remove the odor of coking sludge;

4. This kind of modified cyclodextrin can also be regenerated, which can reduce the cost of coking sludge treatment from 5,000-20,000 yuan/ton of sludge to less than 5,000 yuan/ton of sludge;

5. The harmless treated coking sludge can be reused as resources;

6. Reduce and reduce the pollution of coking sludge to the environment, and avoid secondary pollution during the treatment process.

Description of drawings

Figure 1 is untreated coking sludge.

Fig. 2 is coking sludge treated by the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and those skilled in the art should understand that the embodiments are only for illustration and do not constitute any limitation to the present invention.

Example 1

Take 1000ml of non-dehydrated coking sludge containing 50000mg/L of organic pollutants and 1% of heavy metal ions in a beaker, weigh 20g of modified cyclodextrin and place it in the filter screen, and place the filter screen in the coking sludge In the mud, use a magnetic stirrer to stir for 2 hours, take out the sludge for centrifugation, take the supernatant, measure its concentration as 500mg/L, and analyze the heavy metal ion of the lower layer of sludge as 100mg/L, modified cyclodextrin Regeneration, after coking sludge is centrifuged, the wastewater is sent to the wastewater treatment plant, and the sludge is air-dried and used as backfill.

Example 2

Take 1000ml of undehydrated coking sludge containing 25000mg/L of organic pollutants and 0.5% of heavy metal ions in a beaker, then weigh 15g of modified cyclodextrin and place it on the filter screen, and place the filter screen on the coking sludge. In the mud, use a magnetic stirrer to stir for 2 hours, take out the sludge for centrifugation, take the supernatant, measure its concentration as 100mg/L, and analyze the heavy metal ion of the lower layer of sludge as 40mg/L, modified cyclodextrin Regeneration, after coking sludge is centrifuged, the wastewater is sent to the wastewater treatment plant, and the sludge is air-dried and used as backfill.

Example 3

Take 1000ml of undehydrated coking sludge containing 1000mg/L of organic pollutants and 100mg/L of heavy metal ions and put it in a beaker, then weigh 15g of modified cyclodextrin and put it on the filter screen, and place the filter screen on the coking In the sludge, use a magnetic stirrer to stir for 2 hours, take out the sludge for centrifugation, take the supernatant, measure its concentration as 20mg/L, and analyze the heavy metal ion of the lower layer of sludge as 10mg/L, modified cyclopaste Fine regeneration, coking sludge is centrifuged, the waste water is sent to the wastewater treatment plant, and the sludge is air-dried and used as backfill.

Claims (4)

1. a kind of coking sludge method for innocent treatment, it is characterised in that coking sludge is positioned in container, function Material modification cyclodextrin is wrapped in filter screen, is put in coking sludge, is stirred by coking sludge, connects the two Touch, reach the purpose of harmless treatment.

2. coking sludge method for innocent treatment according to claim 1, it is characterised in that comprise the following steps that：

A dries 24~32h during the modified cyclodextrin for preparing is vacuum dried more than 50 DEG C；

B in container to adding coking sludge；

Be wrapped in modified cyclodextrin in filter screen by C；

Be positioned over modified cyclodextrin in filter screen in coking sludge by D；

E is stirred to coking sludge.

3. coking sludge method for innocent treatment according to claim 2, it is characterised in that in step B, sludge Can also be the sludge after other Industrial Wastewater Treatments.

4. coking sludge method for innocent treatment according to claims 1 to 3, it is characterised in that modified cyclodextrin pair Benzene class, phenols organic pollution and heavy metal ion in sludge have Adsorption to act on.