Treatment method of gasification wastewater of coal chemical industry

A treatment method and technology of coal chemical industry, applied in degassed water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of difficulty in reclaimed water reuse and large fluctuations in sewage treatment effect

Inactive Publication Date: 2020-09-04
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a treatment method for coal chemical gasification wastewater, which

Method used

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  • Treatment method of gasification wastewater of coal chemical industry
  • Treatment method of gasification wastewater of coal chemical industry
  • Treatment method of gasification wastewater of coal chemical industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] This example is to illustrate the treatment of coal chemical gasification wastewater by using the method of the present invention.

[0092] The first part of the process:

[0093] (1-1) Coal chemical gasification wastewater from the pump outlet of the slag water section (wherein, the components of the coal chemical gasification wastewater include a pH value of 8.5, COD Cr is 1200mg / L, oil content is 1mg / L, ammonia nitrogen is 500mg / L, total phosphorus is 3mg / L in terms of P, dissolved solids are 4000mg / L, and suspended solids are 200mg / L), after adding lye and mixing into the gray water feed tank;

[0094] Boost the pressure to 0.3MPaG by a pump and send it into the gray water reactor, add alkali liquor and polymer A as a flocculant in the gray water reactor (polymer A is a coagulant containing iron salt and / or aluminum salt) In order to promote the settlement of suspended solids in the gray water, the pH in the reactor is controlled to be 11, and the fully stirred gr...

Embodiment 2

[0128] The coal chemical gasification wastewater was treated in the same manner as in Example 1, except that the conditions adopted were different, specifically, as shown in Table 1.

[0129] Results The method can ensure the stable treatment effect of treated sewage; COD Mn ≤2mg / L, pH value is 7.5, oil content is 0.01mg / L, ammonia nitrogen is 0.5mg / L, total phosphorus is 0.2mg / L in terms of P, dissolved solids are 200mg / L, and suspended solids are 0.1mg / L; it can be reused as reclaimed water for further advanced treatment; the accompanying crystalline salt (sodium chloride) can be used as a qualified product.

Embodiment 3

[0131] The coal chemical gasification wastewater was treated in the same manner as in Example 1, except that the conditions adopted were different, specifically, as shown in Table 1.

[0132] Results The method can ensure the stable treatment effect of treated sewage; COD Mn ≤2mg / L, pH value is 7.5, oil content is 0.01mg / L, ammonia nitrogen is 0.1mg / L, total phosphorus is 0.2mg / L in terms of P, dissolved solids are 200mg / L, and suspended solids are 0.1mg / L; it can be reused as reclaimed water for further advanced treatment; the accompanying crystalline salt (sodium chloride) can be used as a qualified product.

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Abstract

The invention relates to the technical field of coal chemical industry sewage treatment, and discloses a treatment method of gasification wastewater of the coal chemical industry. The method comprisesthe following steps: sequentially carrying out grey water pretreatment, biochemical treatment and reuse water treatment on the gasification wastewater of the coal chemical industry to obtain purifiedproduced water, wherein the grey water pretreatment comprises pretreatment, clarification treatment and steam stripping treatment which are carried out in sequence. According to the method, the ammonia nitrogen content can be reduced to 350 mg/L or below, the hardness can be reduced to 1200 mg/L or below, and COD is smaller than or equal to 2 mg/L.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry wastewater treatment, in particular to a treatment method for coal chemical gasification wastewater. Background technique [0002] Coal gasification is the first unit process of coal chemical industry, using coal water slurry gasification technology to produce H 2 In this process, a large amount of complex sewage will be produced, and due to the high concentration of COD and ammonia nitrogen, the treatment of such sewage has become a difficult problem in water treatment and has become one of the main pollution sources of the water environment. [0003] The composition of coal gasification wastewater is complex, containing a variety of inorganic pollutants such as ammonia, sulfate, carbonate, cyanide, etc., and also contains a variety of organic substances such as phenolic compounds, fatty acids, tar, ketones and amines. Among them, the concentration of calcium, magnesium ions and s...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01D3/04C01D3/14C01D5/10C01D5/16C02F101/16C02F101/38
CPCC02F9/00C01D3/04C01D3/14C01D5/10C01D5/16C02F1/66C02F1/56C02F1/5236C02F1/001C02F1/02C02F1/04C02F1/20C02F2001/007C02F3/302C02F7/00C02F3/10C02F5/02C02F1/444C02F1/441C02F5/06C02F1/042C02F1/041C02F2101/16C02F2101/38C02F2301/08C02F2001/425
Inventor 李成贺飞闫彦龙叶飞郭勇程新明朱德汉莘振东武海杰吴银生张秀云刘义李玉林李晓华
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD
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