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A zero-discharge treatment method for concentrated salty sewage

A treatment method and zero-discharge technology, applied in water/sewage treatment, multi-stage water/sewage treatment, biological water/sewage treatment, etc., can solve the problems of difficult reuse of treated effluent and difficulty in the treatment of concentrated salty sewage

Active Publication Date: 2018-11-27
中石油吉林化工工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the difficulty in the treatment of concentrated salt sewage in the coal chemical industry and the difficulty in reusing the treated water, the present invention proposes a zero-discharge treatment method for concentrated salt sewage

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  • A zero-discharge treatment method for concentrated salty sewage
  • A zero-discharge treatment method for concentrated salty sewage

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0017] The concentrated brine sewage produced by the Shell gasifier mainly includes gasification wastewater, concentrated water for reuse and refined water from condensate. The typical water quality is shown in Table 1, Table 2 and Table 3, respectively.

[0018] Table 1 Water quality table of gasification wastewater (except mg / L pH)

[0019]

[0020] Table 2 Concentrated water quality table for reuse water (except mg / L pH)

[0021] pH

[0022] Table 3 Condensate Refined Water Q...

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Abstract

The invention discloses a concentrated salt sewage zero-discharge treatment method. The method comprises the following steps: cyanide breaking; defluorination; softening pretreatment; MBR (membrane bioreactor) biological treatment; nanofiltration reverse osmosis deep treatment; MVR (mechanical vapor recompression) evaporative crystallization treatment. The concentrated salt sewage zero-discharge treatment method is mainly applied in the field of treatment of sewage in the coal chemical industry and is especially suitable for treating cyanide containing sewage generated by Shell gasifiers. The treated effluent can reach the Reuse of Urban Recycling Water-Water Quality Standard for Industrial Uses, can be directly used for replenishing the industrial circulating water, can be widely applied in industrial production and has good treatment effects. The problems that the concentrated salt sewage in the coal chemical industry is difficult to treat and the treated effluent is difficult to reuse are solved by adopting the method.

Description

technical field [0001] The invention relates to the field of coal chemical sewage treatment, and more specifically, relates to a zero-discharge treatment method for concentrated salt sewage. Background technique [0002] As a comprehensive coal utilization technology, coal gasification is the basis of coal chemical industry, hydrogenation, coal liquefaction and other processes. At present, there are three kinds of coal gasification used in my country: Lurgi gasifier (Lurgi fixed bed gasifier), Shell gasifier (Shell gasifier), Texaco gasifier (Texaco coal-water slurry gasifier) In the process, the Shell gasifier adopts the pressurized airflow pulverized coal gasification technology, the gasification temperature is about 1400-1700 ℃, the carbon conversion rate is as high as over 99%, the product gas is relatively clean, does not contain heavy hydrocarbons, and the methane content is extremely low. Effective gas in gas (CO+H 2 ) up to more than 90%, so the gasification process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/08C02F1/5245C02F1/56C02F1/66C02F1/722C02F3/1268C02F9/00
Inventor 邵志国林清武胡良张宇张锐锋叶万东王淑萍谢晓峰王利刚苏俊涛
Owner 中石油吉林化工工程有限公司