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Combined reagent applied to deep treatment of coking wastewater to remove COD and discolor, and application thereof

A technology for coking wastewater and advanced treatment, which is applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. Influence, troublesome operation and management, etc., to achieve the effect of improving COD removal rate and chroma removal rate, improving chemical phosphorus removal effect, and good adaptability

Inactive Publication Date: 2020-10-23
众意环保科技(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fenton method: the effect is better, but there are many types of chemicals added in the process, the operation and management are troublesome, and a large amount of sludge is generated, forming secondary pollution
The construction and operation costs of biological treatment methods are relatively high, and they are easily affected by climatic conditions, and must be used in combination with other methods to achieve good results

Method used

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  • Combined reagent applied to deep treatment of coking wastewater to remove COD and discolor, and application thereof
  • Combined reagent applied to deep treatment of coking wastewater to remove COD and discolor, and application thereof
  • Combined reagent applied to deep treatment of coking wastewater to remove COD and discolor, and application thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The steps for preparing a combined agent for advanced treatment of coking wastewater to remove COD and decolor are as follows:

[0027] First purchase industrial grade calcium oxide, powder activated carbon, aluminum sulfate, polymeric ferric sulfate, polymeric aluminum ferric silicate, quaternary ammonium salt, and anionic polyacrylamide.

[0028] A combined agent suitable for the advanced treatment of coking wastewater to remove COD and decolorize. Firstly, measure 700 parts of polyferric sulfate and 300 parts of polyaluminum ferric silicate and mix to make a compound iron salt; secondly, place 80g of activated carbon in a container , Add water and stir (according to the activated carbon to water mass ratio of 3:5), adjust into a uniform paste; add 10g aluminum sulfate and 10g lime successively, stir for 30 minutes, and dry at 100℃ until the moisture is less than 5%. Then use a ball mill to grind to 200-300 mesh, and obtain modified activated carbon after sieving.

[0029] ...

Embodiment 2

[0031] A combined agent suitable for the advanced treatment of coking wastewater to remove COD and decolorize. Firstly, measure 800 parts of polyferric chloride and 200 parts of polyaluminum ferric silicate and mix them to make a compound iron salt; secondly, place 75g of activated carbon in a container Add water and stir (according to the mass ratio of activated carbon to water: 3:5) to make a uniform paste; add 13g aluminum sulfate and 8g lime in sequence, stir for 30 minutes, and dry at 100℃ until the moisture is less than 5% , Then use a ball mill to grind to 200-300 meshes, and then obtain modified activated carbon after sieving.

[0032] Weigh 10 g of compound iron salt, 5 g of modified activated carbon, and 0.1 g of anionic polyacrylamide, respectively add water to prepare 10%, 5%, and 0.1% solutions (wt%) for later use. The quaternary ammonium salt is used directly without preparation. Measure quaternary ammonium salt: compound iron salt: modified activated carbon: polyac...

Embodiment 3

[0034] A combined agent suitable for the advanced treatment of coking wastewater to remove COD and decolorize. Firstly, measure 900 parts of polyferric chloride and 100 parts of polyaluminum ferric silicate to make a compound iron salt; secondly, place 70g of activated carbon in a container Add water and stir (according to the mass ratio of activated carbon to water: 3:5) to make a uniform paste; add 15g aluminum sulfate and 5g lime successively, stir for 30 minutes, and dry at 100℃ until the moisture is less than 5% , Then use a ball mill to grind to 200-300 meshes, and then obtain modified activated carbon after sieving.

[0035] Weigh 10 g of compound iron salt, 5 g of modified activated carbon, and 0.1 g of anionic polyacrylamide, respectively add water to prepare 10%, 5%, and 0.1% solutions (wt%) for later use. The quaternary ammonium salt is used directly without preparation. Measure quaternary ammonium salt: compound iron salt: modified activated carbon: polyacrylamide=200...

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Abstract

The invention discloses a combined reagent applied to deep treatment of coking wastewater to remove COD and discolor, and application thereof. The reagent comprises, by weight, 100-200 parts of quaternary ammonium salt, 100-200 parts of compound ferric salt, 200-400 parts of modified activated carbon and 1-2 parts of anionic polyacrylamide. The compound ferric salt is prepared from 700-900 parts of polyferric sulfate or polyferric chloride and 100-300 parts of polyaluminum ferric silicate; and the modified activated carbon comprises 7-8 parts of activated carbon, 1-1.5 parts of aluminum sulfate and 0.5-1 part of lime. A quaternary ammonium salt stock solution and the compound ferric salt are respectively prepared into 10% solutions, a 5% solution is prepared from the modified activated carbon, preparing a 0.01% solution is prepared from the anionic polyacrylamide, the solutions are added into coking wastewater which is subjected to biochemical treatment in a coking plant and has COD of300-500 mg / L and chromaticity of 150-250 times, reinforced composite coagulation is carried out, and it is detected that the COD of effluent of the coking wastewater is less than 100 mg / L, thereby reaching the indirect discharge standard of the coking industry. And the effluent chromaticity is less than 20 times. Under the synergistic action of adsorption and enhanced flocculation, the combined reagent has the advantages of high COD removal efficiency, favorable precipitation effect and low operating cost, and can be widely suitable for advanced wastewater treatment of coking plants of different scales.

Description

Technical field [0001] The patent of the present invention relates to the field of industrial wastewater treatment. Specifically, it provides a combination agent applied to the advanced treatment of coking wastewater and its application in the advanced treatment of industrial wastewater. Background technique [0002] Coking and coal gasification wastewater is wastewater produced in the process of making coal gas. The main feature is that the concentration of pollutants is extremely high, and various components in the crude gas are dissolved or suspended, and contain a large amount of phenol, ammonia, sulfide, and cyanide. And tar, as well as numerous heterocyclic compounds and polycyclic aromatic hydrocarbons. [0003] The water quality of typical coking wastewater is shown in the table below: [0004] index Range mg / Lindex Range mg / L COD3000-4000 Volatile phenols<300 BOD1000-1500 Polyphenols<500 Ammonia≤150 Total alkalinity2000 Organic nitrogen30-50 Carbonate1000 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/28C02F1/52
CPCC02F1/56C02F1/281C02F1/5236
Inventor 王宇世
Owner 众意环保科技(大连)有限公司
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