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Method for treating and utilizing coal gasification wastewater

A coal gasification wastewater purification treatment technology, applied in the field of water treatment, can solve the problems of lack of economical and effective emission reduction measures, and achieve the effects of resource utilization, carbon dioxide emission reduction, and consumption reduction

Inactive Publication Date: 2014-03-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the coal-to-natural gas production process emits a large amount of CO 2 , and the lack of cost-effective emission reduction measures is another environmental protection problem facing the development of the coal-to-natural gas industry

Method used

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  • Method for treating and utilizing coal gasification wastewater
  • Method for treating and utilizing coal gasification wastewater
  • Method for treating and utilizing coal gasification wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] This embodiment is used to illustrate the treatment and utilization method of coal gasification wastewater provided by the present invention.

[0093] (1) Biochemical treatment:

[0094] Biochemical treatment includes sequential anaerobic biological treatment and aerobic biological treatment, wherein, the anaerobic biological treatment is figure 1 Carried out in the shown anaerobic sludge expanded bed reactor, the sludge concentration in the acid-producing bacteria accumulation area 22 and the methanogen accumulation area 23 is 30g / L, and the high 18m of described anaerobic sludge expanded bed reactor, The diameter is 14m, the height of the acid-producing bacteria gathering area 22 is 4.2m, and the height of the methanogenic bacteria gathering area 23 is 8.4m. The aerobic biological treatment in figure 2 Carried out in the shown aerobic biofilm reactor, wherein, the sludge concentration is 5g / L;

[0095] Under the conditions of a temperature of 34°C and a pH value o...

Embodiment 2

[0105] This embodiment is used to illustrate the treatment and utilization method of coal gasification wastewater provided by the present invention.

[0106] (1) Biochemical treatment:

[0107] Biochemical treatment includes sequential anaerobic biological treatment and aerobic biological treatment, wherein, the anaerobic biological treatment is figure 1 The anaerobic sludge expanded bed reactor shown is carried out, wherein, the sludge concentration in the acid-producing bacteria accumulation area 22 and the methanogen accumulation area 23 is 10g / L, and the described anaerobic sludge expanded-bed reactor is high The height of the acid-producing bacteria gathering area 22 is 4.8 m, and the height of the methanogenic bacteria gathering area 23 is 8.4 m. The aerobic biological treatment in figure 2 Carried out in the shown aerobic biofilm reactor, wherein, the sludge concentration is 4g / L;

[0108] Under the conditions of a temperature of 37°C and a pH value of 7, the pretre...

Embodiment 3

[0118] This embodiment is used to illustrate the treatment and utilization method of coal gasification wastewater provided by the present invention.

[0119] (1) Biochemical treatment:

[0120] Biochemical treatment includes sequential anaerobic biological treatment and aerobic biological treatment, wherein, the anaerobic biological treatment is figure 1 Carried out in the shown anaerobic sludge expanded bed reactor, the sludge concentration in the acid-producing bacteria accumulation area 22 and the methanogen accumulation area 23 is 50g / L, and the high 18m of described anaerobic sludge expanded bed reactor, The height of the acid-producing bacteria gathering area 22 is 4.8m, and the height of the methanogenic bacteria gathering area 23 is 9.6m. The aerobic biological treatment in figure 2 Carried out in the shown aerobic biofilm reactor, wherein, the sludge concentration is 3g / L;

[0121] Under the conditions of a temperature of 36°C and a pH value of 8, the pretreated c...

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Abstract

The invention provides a method for treating and utilizing coal gasification wastewater. The method comprises: sequentially carrying out pretreatment on to-be-treated coal gasification wastewater, biochemical treatment, denitrification treatment, advanced treatment and microalgae purification treatment. The method provided by the invention is used for treating the coal gasification wastewater so as to greatly reduce the COD value and contents of total phenolics and total nitrogen in the wastewater, and the water quality index of the final effluent meets the requirements of GB8978-1996 integrated wastewater discharge primary standard.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for treating and utilizing coal gasification wastewater. Background technique [0002] my country is a country rich in coal resources. In order to cope with the energy shortage brought about by the dwindling oil and natural gas resources, it is in line with the needs of my country's national conditions to step up the efficient and clean utilization of coal. With the improvement of my country's urban progress and people's living standards, the demand for gaseous clean fuels is increasing, and coal-to-natural gas (SNG) products will be the mainstream to replace oil and natural gas. [0003] In recent years, Lurgi crushed coal pressurized gasification process is preferred in the selection of coal gasification process. The main advantage of the Lurgi gasification process lies in the high methane content in the gasified crude gas, but the biggest disadvantage is that the gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 于广欣纪钦洪张振家卿人韦缪晓玲
Owner CHINA NAT OFFSHORE OIL CORP
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