Method for biochemically treating coking wastewater

A technology for coking wastewater and biochemical treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor ammonia nitrogen treatment effect, large amount of sludge and complex process of coking wastewater and other problems, to achieve the effect of reducing the dosage of alkalinity, occupying less land, and simple process

Active 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

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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 biochemical treatment method that can solve the problems of poor ammonia nitrogen treatment effect, large amount of sludge, complicated process and high cost in the biochemical treatment of coking wastewater

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  • Method for biochemically treating coking wastewater
  • Method for biochemically treating coking wastewater

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Embodiment 1

[0025] A kind of coking wastewater biochemical treatment method of the present invention comprises the following steps: (1) coking wastewater is pretreated, and the pretreatment process can be a micro-electrolysis process; (2) coking wastewater after pretreatment enters an anaerobic tank for Anaerobic treatment, influent COD, ammonia nitrogen, volatile phenol and cyanide are about 2600mg / L, 120mg / L, 160mg / L and 32mg / L respectively; the anaerobic tank is a mechanically stirred upflow anaerobic sludge bed ( UASB), the pH of the anaerobic pool is 6.8-7.2, and the hydraulic retention time is 24h; (3) The wastewater after anaerobic treatment enters the aerobic three-phase fluidized bed for aerobic treatment; the aerobic three-phase fluidized bed is Internal circulation three-phase fluidized bed, in which light carrier is added to cultivate a large number of microorganisms in the form of fluidized biofilm. The pH of the aerobic three-phase fluidized bed is 7.8, the hydraulic retentio...

Embodiment 2

[0027] A kind of coking wastewater biochemical treatment method of the present invention comprises the following steps: (1) coking wastewater is pretreated, and the pretreatment process can be a micro-electrolysis process; (2) coking wastewater after pretreatment enters an anaerobic tank for Anaerobic treatment, influent COD, ammonia nitrogen, volatile phenol and cyanide are about 3500mg / L, 55mg / L, 950mg / L and 36mg / L respectively; the anaerobic tank is a mechanically stirred upflow anaerobic sludge bed ( UASB), the pH of the anaerobic tank is 6.5, and the hydraulic retention time is 30h; (3) The wastewater after anaerobic treatment enters the aerobic three-phase fluidized bed for aerobic treatment, and the aerobic three-phase fluidized bed is the internal circulation Type three-phase fluidized bed, in which immobilized microorganisms are directly added, the pH of the three-phase fluidized bed is 8.2, the hydraulic retention time is 20h, the dissolved oxygen is 3mg / L, and the ef...

Embodiment 3

[0029] A biochemical treatment method of coking wastewater of the present invention comprises the following steps: (1) pretreatment of coking wastewater, the pretreatment process may be a flocculation process; (2) pretreated coking wastewater enters an anaerobic tank Oxygen treatment, influent COD, ammonia nitrogen, volatile phenol and cyanide are about 3100mg / L, 65mg / L, 910mg / L and 31mg / L respectively; the anaerobic tank is a mechanically stirred upflow anaerobic sludge bed (UASB ), the pH of the anaerobic pool is 6.0, and the hydraulic retention time is 8h; (3) The wastewater after anaerobic treatment enters the aerobic three-phase fluidized bed for aerobic treatment, and the aerobic three-phase fluidized bed is an internal circulation type Three-phase fluidized bed, in which immobilized microorganisms are directly added, the pH of the three-phase fluidized bed is 7.5, the hydraulic retention time is 8h, the dissolved oxygen is 2mg / L, and the effluent COD, ammonia nitrogen, v...

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Abstract

The invention discloses a method for biochemically treating coking wastewater. The method comprises the following steps of: pretreating coking wastewater; feeding pretreated coking wastewater into an anaerobic tank for anaerobic treatment; and feeding the treated wastewater into an aerobic three-phase fluidized bed for anaerobic treatment, wherein the pH of the anaerobic tank is between 6.0 and 7.5; the hydraulic retention time is between 8 and 30 hours; the pH of the aerobic three-phase fluidized bed is between 7.5 and 8.5; the hydraulic retention time is between 8 and 24 hours; the dissolved oxygen content is between 2 and 4mg/L; and effluent COD, ammonia nitrogen, volatile phenol and cyanide meet the steel industrial water pollutant effluent standard (GB13456-92) and the primary standard of the integrated wastewater effluent standard (GB 8978-1996). The method can effectively solve the problems of bad treatment effect, large amount of sludge, complicated process, high cost and the like caused by biochemically treating the coking wastewater by ammonia nitrogen and has the advantages of simple operation, low cost, economic feasibility, contribution to popularization, and capability of effectively improving and solving the problem of environment pollution caused by the coking wastewater.

Description

technical field [0001] The invention relates to a waste water treatment method, in particular to a biochemical treatment method for coking waste water without setting a sedimentation tank and without returning sludge, waste water or mixed liquor. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 严佳珺严莲荷胡开亮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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