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Deep treatment method of coking wastewater

A coking sewage and advanced treatment technology, which is applied in water/sewage treatment, neutralized water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of failure to meet the direct discharge standard, substandard treatment effect, and high treatment cost, etc. Problems, to achieve the effect of sterilization and removal of heavy metals, improve biodegradability, and increase income

Inactive Publication Date: 2018-02-09
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since conventional biochemical treatment can only degrade part of the small molecule organic pollutants in coking sewage, the effluent chromaticity and COD of coking sewage after coagulation and sedimentation treatment on this basis cr (COD cr about 150~180mg / L) still can’t meet the direct discharge standard of GB16171-2012, the main reason is that there are still many biochemical difficulties such as indole, carbazole and quinoline in the coking sewage after coagulation and sedimentation treatment. Degraded macromolecular organic pollutants, so it is necessary to use coking sewage advanced treatment technology for further purification after coagulation and sedimentation treatment
In the existing technology, commonly used coking sewage advanced treatment technologies mainly include advanced oxidation technology, membrane treatment, physical adsorption, chemical reagents, enhanced biotechnology, ozone + biological aerated filter (BAF), etc., but these coking sewage The advanced treatment technology is either good in treatment effect but expensive in treatment cost, or low in treatment cost but not up to standard in treatment effect, so there is an urgent need for an advanced treatment method for coking wastewater with low treatment cost and stable effluent quality up to standard

Method used

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  • Deep treatment method of coking wastewater

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Experimental program
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Effect test

Embodiment approach

[0019] (1) Coking sewage COD after the coagulation and sedimentation treatment cr Less than 200mg / L, preferably 150-180mg / L.

[0020] (2) The internal circulation type iron-carbon micro-electrolysis reactor can adopt the internal circulation type iron-carbon micro-electrolysis reactor disclosed in the Chinese patent of ZL201510550165.0; the internal circulation type iron-carbon micro-electrolysis reactor The inner space of the reactor is divided into an upflow zone and a downflow zone by a flow-blocking baffle inside, and in the upflow zone, it depends on aeration to rise, and in the downflow zone, it relies on its own pressure difference to drop, thus forming the internal circulation of the reactor. flow to achieve deep purification treatment of coking sewage.

[0021] (3) In the internal circulation type iron-carbon micro-electrolysis reactor, the volume ratio of iron filings and activated carbon can be 1:3~3:1, but it is preferably 1:1, and the iron-carbon volume ratio is ...

Embodiment 1

[0041] A method for advanced treatment of coking sewage, which is used for deep purification treatment of coking sewage after coagulation and sedimentation treatment with a COD concentration of 200mg / L, which specifically includes: adjusting the pH value of coking sewage after coagulation and sedimentation treatment to 3.2, Then pass into the internal circulation iron-carbon micro-electrolysis reactor for purification treatment. In the internal circulation iron-carbon micro-electrolysis reactor, the volume ratio of iron filings and activated carbon is 1:1, and the aeration rate is 0.1-0.25m 3 / h, the reaction temperature is room temperature, and the hydraulic retention time is 60-120 minutes; then it is passed into the sedimentation tank after the reaction, the pH value is adjusted to 8-9, and the effluent is obtained after standing for 30 minutes.

[0042] Specifically, the COD of the effluent obtained by the coking sewage advanced treatment method provided in Example 1 of the...

Embodiment 2

[0044] A method for advanced treatment of coking sewage, which is used for deep purification treatment of coking sewage with a COD concentration of 180 mg / L after coagulation and sedimentation treatment, which specifically includes: adjusting the pH value of coking sewage after coagulation and sedimentation treatment to 3.2, Then pass into the internal circulation iron-carbon micro-electrolysis reactor for purification treatment. In the internal circulation iron-carbon micro-electrolysis reactor, the volume ratio of iron filings and activated carbon is 1:1, and the aeration rate is 0.1-0.25m 3 / h, the reaction temperature is room temperature, and the hydraulic retention time is 60-120 minutes; then it is passed into the sedimentation tank after the reaction, the pH value is adjusted to 8-9, and the effluent is obtained after standing for 30 minutes.

[0045] Specifically, the COD of the effluent obtained by the coking sewage advanced treatment method provided in Example 2 of th...

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Abstract

The invention discloses a deep treatment method of coking wastewater to provide deep purification for coking wastewater that is subjected to coagulating sedimentation. The method of the invention comprises the specific steps of adjusting pH of the coking wastewater that is subjected to coagulating sedimentation to 2-4, and introducing the coking wastewater into an internal cycle iron-carbon micro-electrolysis reactor for the purpose of purification, wherein hydraulic retention time of the internal cycle iron-carbon micro-electrolysis reactor is 60-120 min; introducing the wastewater into a post-reaction settling tank, adjusting pH to 8-9, and allowing standing and precipitating for 30 min. The quality of outgoing water treated via the method of the invention reaches the direct discharge standard in Emission Standard of Pollutants for Coking Chemical Industry GB16171-2012, the quality of the outgoing water is stable, the treatment cost is low, and benefit can be increased for enterprises.

Description

technical field [0001] The invention relates to the field of advanced treatment of coking sewage, in particular to a method for advanced treatment of coking sewage. Background technique [0002] In recent years, my country's coal chemical industry has developed rapidly. According to the statistics of the National Bureau of Statistics, the coke output in 2015 reached 448 million tons. However, with the rapid development of the coal chemical industry, the pollution problem of coking sewage is becoming more and more serious. The annual discharge of coking sewage in my country is about 300 million tons. Coking sewage is a high-concentration, refractory, and highly toxic production sewage containing dozens of pollutants such as ammonia nitrogen, phenols, cyanides, and polycyclic aromatic hydrocarbons; Serious negative impact on biological survival. With the enhancement of human's awareness of environmental protection and the improvement of the pollutant discharge system, in 201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/46176C02F1/467C02F1/52C02F1/66C02F9/00C02F2001/007C02F2301/04C02F2301/08
Inventor 韩严和张雷刘美丽齐蒙蒙张思韬
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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