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Coking wastewater treatment method

A treatment method and technology of coking wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unstable effluent indicators, easy inhibition or poisoning of microorganisms, etc. Achieve the effect of reducing organic load and toxicity inhibition, compact structure and reasonable combination

Active Publication Date: 2014-07-23
SHANDONG SUNYON GRP
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to the difficulty of the above-mentioned treatment, when coking wastewater is directly treated by ordinary biological treatment methods, microorganisms are easily inhibited or poisoned, and the effluent indicators after treatment are unstable. Therefore, coking wastewater needs to be pretreated before biological treatment to remove Toxic substances, improve biochemical properties, and adapt to the water quality requirements of biological treatment

Method used

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  • Coking wastewater treatment method

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Embodiment 1

[0036] The process wastewater produced by a coking plant is mainly ammonia distillation wastewater and domestic sewage, and the water quality of ammonia distillation wastewater is shown in Table 1. Adopt processing method of the present invention to process, operate as follows:

[0037] The process wastewater enters the grease trap to remove heavy oil and then enters the air flotation degreasing machine. After the oil droplets and microbubbles in the wastewater adsorb each other to form an oil slick, the oil layer is discharged through the scraper coating machine, and the lower layer of wastewater is discharged through the bottom pipeline into the denitrification tank; adding Na 2 CO 3 Adjust wastewater pH to 9, according to Mg 2+ :PO 4 3- :NH 4 + =1.2:1:1 (molar ratio) by adding MgCl 2 and K 2 HPO 4 , forming MgNH 4 PO 4 .6H 2 O precipitation makes NH in wastewater 4 + can be removed; after denitrification, the wastewater enters the reaction pool, according to Fe...

Embodiment 2

[0040] The process wastewater produced by a coking plant is mainly ammonia distillation wastewater and domestic sewage. The water quality of ammonia distillation wastewater is shown in Table 2. Adopt processing method of the present invention to process, operate as follows:

[0041] The process wastewater enters the grease trap to remove heavy oil and then enters the air flotation degreasing machine. After the oil droplets and microbubbles in the wastewater adsorb each other to form an oil slick, the oil layer is discharged through the scraper coating machine, and the lower layer of wastewater is discharged through the bottom pipeline into the denitrification tank; adding Na 2 CO 3 Adjust wastewater pH to 9, according to Mg 2+ :PO 4 3- :NH 4 + =1.5:1:1 (molar ratio) by adding MgCl 2 and K 2 HPO 4 , forming MgNH 4 PO 4 .6H 2 O precipitation makes NH in wastewater 4 + can be removed; after denitrification, the wastewater enters the reaction pool, according to Fe 2+...

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Abstract

The invention provides a coking wastewater treatment method. High-concentration coking wastewater with 7000-8000mg / L of COD (Chemical Oxygen Demand), 6000-6500mg / L of ammonia nitrogen, 800-900mg / L of volatile phenol and 100-200mg / L of cyanide is treated through the steps of: pretreatment; alkaline microelectrolysis; average value regulation; biological treatment; precipitation, drainage and the like. The method is high in efficiency for removing ammonia, phenol, cyanogen and suspended matters and stable in water quality of effluent.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for coking waste water. Background technique [0002] Coking wastewater is the wastewater of a large number of aromatic compounds and heterocyclic compounds produced in the process of coal coke, gas purification and coking product recovery. Coking wastewater is a recognized industrial wastewater that is difficult to biodegrade. The difficulty of its treatment lies in the high content of cyanide and phenols, the difficulty of biodegradation of polycyclic aromatic hydrocarbons and heterocyclic compounds, poor biodegradability, and high concentration of ammonia nitrogen inhibits biological activity. The denitrification effect is not good. [0003] At present, the treatment method of coking wastewater mainly adopts biological method for treatment. However, due to the difficulty of the above-mentioned treatment, when coking wastewater is directly t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 殷自道高桂富殷云华
Owner SHANDONG SUNYON GRP
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