Method for processing coal gasification wastewater

A technology for coal gasification wastewater and treatment method, which is applied in the fields of gaseous effluent wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Problems such as low COD removal efficiency

Active Publication Date: 2010-02-24
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent has disadvantages: its biological treatment part has poor resistance to high-concentration coking wastewater, and also has poor resistance to changes in influent water; its physical and chemical treatment part has low removal efficiency for wastewater chroma and COD
The disadvantages of this patent are: the p

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  • Method for processing coal gasification wastewater
  • Method for processing coal gasification wastewater
  • Method for processing coal gasification wastewater

Examples

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Embodiment 1

[0042] The method of the present invention is used to carry out small-scale experimental treatment of the coal gasification summary wastewater of a certain company whose COD and ammonia nitrogen are about 5000-8000 mg / L and 500-800 mg / L respectively. Each reactor is made of plexiglass, and the waste water enters the coagulation sedimentation tank after passing through the flat grease trap. The coagulants added are polyaluminum chloride (PAC) and polyacrylamide (PAM), and the dosage is 200-300mg respectively / L and 3-6mg / L, after stirring, coagulation and sedimentation, the wastewater enters the regulating tank. It is mixed with the company's domestic sewage in the adjustment tank. The mixing ratio of coal gasification wastewater and domestic sewage is 3:1, and then the pH value of the mixed wastewater is controlled at 6-9. After mixing, the waste water is pumped into O1, which uses granular carbon felt filler, the filling volume of the filler is 70%, the acclimatization time o...

Embodiment 2

[0046] The comprehensive coal gasification wastewater COD and ammonia nitrogen produced in various sections of a coal chemical company are 3000-4000mg / L and 300-400mg / L respectively, and the process of the present invention is used for pilot treatment. Wastewater is treated by oil separation and coagulation (PAC and PAM dosages are 200-300mg / L and 3-6mg / L respectively) and then pumped directly into O1, which uses a mixture of granular carbon felt, granular plastic and mesh plastic Filler, the filling amount is 80%, the acclimatization time of film formation is 20 days, the hydraulic retention time is 15h, the dissolved oxygen is controlled at 3-6mg / L, and the pH is controlled at 6.5-8.5. The materials of the anode and cathode of BEC are all carbon felts, and the surface of the cathode is coated with a hydrogen evolution catalyst (60% Ni, 30% Al, 2% Co, 8% Sn), and the two poles are connected to the external power supply by wires. There is an anaerobic sludge layer, the acclima...

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PUM

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Abstract

The invention discloses a method for processing coal gasification wastewater. The method sequentially comprises the following steps: a. carrying out preprocessing on the coal gasification wastewater in a preprocessing step comprising oil removal processing, coagulation processing and optional adjustment processing; then b. leading the preprocessed coal gasification wastewater to sequentially flowthrough a first-class bio-contact oxidation reactor, a biological electrochemical reactor, a second-class bio-contact oxidation reactor and an optional third-class or multi-class bio-contact reactor to carry out biological processing; and c. leading the biologically processed coal gasification wastewater to carry out catalytic oxidation processing in a catalytic oxidation reactor.

Description

field of invention [0001] The invention relates to a treatment method of coal gasification wastewater, more specifically, the invention relates to the treatment of coal gasification wastewater by a method comprising three steps of pretreatment, biological treatment and catalytic oxidation treatment in sequence. Background technique [0002] The application of coal as energy and chemical raw materials has been paid more and more attention. Coal gasification is a clean and efficient coal utilization method, but the coal gasification process produces a large amount of highly polluted coal gasification wastewater, which contains a variety of pollutants, such as phenol, cyanide, ammonia nitrogen and several aliphatic and aromatic compounds, It needs to be treated effectively before it can be discharged. [0003] In the field of wastewater treatment, indicators such as COD, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, and chromaticity are often used to indicate the type ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/18
Inventor 贾永强李伟
Owner ENN ENVIROTECH CO LTD
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