Treatment method of coal gasification wastewater

A technology of coal gasification wastewater and treatment method, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. complex issues

Inactive Publication Date: 2014-01-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used biochemical treatment methods usually include anaerobic biological treatment, activated sludge method, biological contact oxidation method, sequential batch activated sludge method, etc.; for example, Harbin Institute of Technology uses a two-stage external circulation anaerobic sludge bed reactor As an anaerobic unit, followed by a multi-stage series A / O activated sludge device, as an aerobic treatment unit, comprehensively treats the coal gasification wastewater of Harbin Gasification Plant, and realizes the discharge of wastewater up to standard. However, the process still has a long process, Disadvantages such as complicated device and high energy consumption
In addition, using the existing treatment process to treat coal gasification wastewater, although the wastewater ammonia nitrogen can be treated up to the standard, it only converts the wastewater ammonia nitrogen into nitrate nitrogen, and the total nitrogen content of the wastewater has not been substantially reduced. Direct discharge of waste water may easily cause eutrophication of the water body

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  • Treatment method of coal gasification wastewater

Examples

Experimental program
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Embodiment 1

[0053] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0054] The anaerobic biological treatment in figure 1 The anaerobic sludge expanded bed reactor shown is carried out, wherein, the sludge concentration in the acidogenic bacteria accumulation area 2 and the methanogen accumulation area 3 is 30g / L; the described anaerobic sludge expanded bed reactor is high 18m and a diameter of 14m, the height of the acid-producing bacteria gathering area 2 is 4.2m, and the height of the methanogenic bacteria gathering area 3 is 8.4m. The aerobic biological treatment in figure 2 The aerobic biofilm reactor shown is carried out, wherein the sludge concentration is 5g / L.

[0055] Under the conditions of a temperature of 34°C and a pH value of 6, the coal gasification wastewater to be treated is continuously introduced from the water inlet pipe 1 of the anaerobic sludge expanded bed reactor and passed through t...

Embodiment 2

[0059] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0060] The anaerobic biological treatment in figure 1 Carry out in the shown anaerobic sludge expanded bed reactor, wherein, the sludge concentration in acidogenic bacteria accumulation area 2 and methanogen accumulation area 3 is 10g / L; Described anaerobic sludge expanded bed reactor is high The height of the acid-producing bacteria gathering area 2 is 4.8 m, and the height of the methanogenic bacteria gathering area 3 is 8.4 m. The aerobic biological treatment in figure 2 The aerobic biofilm reactor shown is carried out, wherein the sludge concentration is 4g / L.

[0061]Under the conditions of a temperature of 37°C and a pH value of 7, the coal gasification waste water to be treated is continuously introduced from the water inlet pipe 1 of the anaerobic sludge expanded bed reactor and passed through the water distributor 11 so that the for...

Embodiment 3

[0065] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0066] The anaerobic biological treatment in figure 1 In the shown anaerobic sludge expanded bed reactor, wherein, the concentration of sludge in the acidogenic bacteria accumulation area 2 and the methanogen accumulation area 3 is 50g / L; the anaerobic sludge expanded bed reactor is high The height of the acid-producing bacteria gathering area 2 is 4.8 m, and the height of the methanogenic bacteria gathering area 3 is 9.6 m. The aerobic biological treatment in figure 2 The aerobic biofilm reactor shown is carried out, wherein the sludge concentration is 3g / L.

[0067] Under the conditions of a temperature of 36°C and a pH value of 8, the coal gasification wastewater to be treated is continuously introduced from the water inlet pipe 1 of the anaerobic sludge expanded bed reactor and passed through the water distributor 11 so that the formed a...

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Abstract

The invention provides a treatment method of coal gasification wastewater, which comprises the following steps: the coal gasification wastewater is sequentially subjected to anaerobic biological treatment, aerobic biological treatment and denitrification treatment; by using the methods and conditions of the anaerobic biological treatment and aerobic biological treatment, the COD (chemical oxygen demand) value of the coal gasification wastewater after the aerobic treatment and before the denitrification treatment is 350-500 mg/L, the total phenol content is 60-100 mg/L, the BOD (biochemical oxygen demand) value is 35-50 mg/L, and the total nitrogen content is 200-400 mg/L; and by using the conditions of the denitrification treatment, the COD (chemical oxygen demand) value of the coal gasification wastewater is lower than 350 mg/L, and the total nitrogen content is not higher than 60 mg/L. The method for treating coal gasification wastewater has the advantages of simple procedures, short treatment time and high efficiency, and can effectively remove total nitrogen in the wastewater to avoid eutrophication of the water body.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a treatment method for coal gasification wastewater. Background technique [0002] Coal gasification process is an important part of the coal chemical industry, which refers to the process of converting coal into gas, specifically refers to the process of thermochemical reaction between coal and gasification agent under high temperature conditions to obtain reaction gas. The coal gasification process will produce a large amount of coal gasification wastewater, and its water quality characteristics are related to the type of coal and the type of gasifier. The Lurgi crushed coal pressurized gasification process is one of the most widely used coal gasification processes at present, and the wastewater produced by it has the most complex quality and high concentration of pollutants. The typical Lurgi gasification process mainly includes: put coal on the grate of the gasifier, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/78
Inventor 张振家于广欣纪钦洪王建伟崔徳春盛金鹏常乐
Owner CHINA NAT OFFSHORE OIL CORP
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