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Coking wastewater pretreatment method

A coking wastewater pretreatment technology, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of poor ammonia nitrogen treatment effect, compaction, channeling and other problems in the pretreatment of coking wastewater, and achieve The effect of widening the pH range, reducing the treatment cost and improving the treatment effect

Inactive Publication Date: 2010-12-15
南京洁水科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a coking wastewater pretreatment method that can effectively solve the problems of poor ammonia nitrogen treatment effect, compaction, and channel flow in coking wastewater pretreated by micro-electrolysis

Method used

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Embodiment 1

[0023] A kind of coking waste water pretreatment method of the present invention comprises the following steps: (1) coking waste water enters the adjustment pond, carries out water quality adjustment, and influent COD, ammonia nitrogen and chromaticity are respectively about 3000mg / L, 150mg / L, 600 times (2) The coking waste water that comes out from regulating pond enters micro-electrolysis reactor, reacts with the filler in the micro-electrolysis reactor, and filler is industrial waste iron shavings, scrap copper scrap and zeolite, and its mass ratio is 10: 2: 1 ; The pH of the micro-electrolysis reactor inlet water is 2.0, the hydraulic retention time is 60min, air aeration is used, and industrial waste iron shavings are replenished every 3 days; (3) The effluent of the micro-electrolysis reactor enters the sedimentation tank for flocculation and precipitation, and the effluent of the sedimentation tank is COD 1500-2000mg / L, ammonia nitrogen 90-110mg / L, and chroma 50-100 time...

Embodiment 2

[0025] A kind of coking waste water pretreatment method of the present invention comprises the following steps: (1) coking waste water enters the adjustment pond, carries out water quality adjustment, and influent COD, ammonia nitrogen and chromaticity are respectively about 4500mg / L, 60mg / L, 1000 times (2) The coking waste water that comes out from regulating tank enters micro-electrolysis reactor, reacts with the filler in the micro-electrolysis reactor, and filler is industrial waste iron shavings, waste copper scrap and zeolite, and its mass ratio is 8: 1: 0.2 ; Micro-electrolysis reactor inlet water pH = 4.0, hydraulic retention time 20min; (3) Micro-electrolysis reactor effluent enters the sedimentation tank for precipitation, and the effluent COD of the sedimentation tank is 3000-3600mg / L, ammonia nitrogen is 30-40mg / L, color The degree is 100 to 300 times.

Embodiment 3

[0027] A kind of coking waste water pretreatment method of the present invention comprises the following steps: (1) coking waste water enters the adjustment pond, carries out water quality adjustment, and influent COD, ammonia nitrogen and chromaticity are respectively about 4500mg / L, 60mg / L, 1000 times (2) The coking waste water that comes out from regulating pool enters micro-electrolysis reactor, reacts with the filler in the micro-electrolysis reactor, and filler is industrial waste iron shavings, waste copper scrap and zeolite, and its mass ratio is 12: 3: 3 ; Micro-electrolysis reactor inlet water pH=12.0, hydraulic retention time 40min; (3) Micro-electrolysis reactor effluent enters the sedimentation tank for precipitation, and the COD of the sedimentation tank effluent is 2500-3000mg / L, ammonia nitrogen is 25-35mg / L, color The degree is 100 to 150 times.

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Abstract

The invention discloses a coking wastewater pretreatment method. The method comprises the steps of adjusting water quality in an adjusting tank, reacting the wastewater and filler in a micro electrolysis reactor, settling the reaction product in a sedimentation tank and the like. Waste iron scrap, cooper scrap and zeolite are used as the filler; the pH of the inlet water is 2.0 to 12.0; the hydraulic retention time is 20 to 60 minutes; and B/C of the pretreated outlet water reaches over 0.5 by adopting air aeration. The method can effectively solve the problems of poor ammonia nitrogen treatment effect, hardening, channeling and the like during pre-treating the coking wastewater by using a micro electrolysis method, has the advantages of simple operation, low cost, economy and feasibility, is favorable for popularization and use, and can effectively improve and solve the pollution problem of the coking wastewater to the environment.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for pretreatment of coking wastewater before entering a biochemical treatment system. Background technique [0002] Coking wastewater is the wastewater formed during the high-temperature dry distillation process of coal, gas purification, and chemical product refining process, which contains dozens of pollutants such as phenol, ammonia nitrogen, cyanide, benzene, pyridine, indole, quinoline, and thiocyanate. , with complex components, high pollutant concentration, high chroma, high toxicity, very stable properties, poor biodegradability, and its BOD 5 The ratio to COD is 0.28-0.32, and the content of ammonia nitrogen and total nitrogen is high. It is a kind of difficult-to-treat wastewater with extremely complex components. Its excessive discharge has caused great harm to humans, aquatic products, and crops. How to improve and solve the pollution of coking wastewater to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461
Inventor 严佳珺胡开亮严莲荷肖波陶魄廖东海王鑫海顾慧娟
Owner 南京洁水科技有限公司
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