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Synchronous desulfurization and decyanation method and device for gas-making sewage of coal chemical industry

A technology for desulfurization and decyanation and coal chemical industry, which is applied in the field of synchronous desulfurization and decyanation of coal chemical gas-making sewage and its device field, which can solve the problems of complex system equipment configuration, high operation and management requirements, and complex components of gas-making sewage, and eliminate Biological toxicity, guaranteed normal operation effect

Pending Publication Date: 2020-09-18
德州金智环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition of gas-generating sewage, the effect of decyanation by alkaline chlorination is not ideal, and the first-order reaction needs to be carried out at a pH value above 10, and a large amount of acid and alkali are required to adjust the pH value of sewage. Chlorine or sodium hypochlorite are toxic and harmful chemicals. There are certain safety risks; the removal of sulfide and cyanide needs to be completed in two steps, the system equipment configuration is complicated, and the operation and management requirements are high

Method used

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  • Synchronous desulfurization and decyanation method and device for gas-making sewage of coal chemical industry
  • Synchronous desulfurization and decyanation method and device for gas-making sewage of coal chemical industry

Examples

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example 1

[0036] Example 1: A company's gas-making sewage pretreatment project, the treated water volume: 60m 3 / h.

[0037] Comparison of water quality before and after treatment of gas-making sewage by this technology:

[0038] serial number index unit before processing after treatment Removal rate 1 pH 8-9 6.2-6.5 -- 2 Sulfide mg / L ≤40 ≤5 ≥87.5％ 3 cyanide mg / L ≤30 ≤3 ≥90％ 4 suspended matter mg / L ≤100 ≤30 ≥70％ 5 COD mg / L ≤1500 ≤1200 ≥20％

[0039] The sulfide of gas-making sewage before treatment in this project: 40mg / L, cyanide: 30mg / L, after using this technology to treat, the system effluent sulfide: 5mg / L, cyanide: 3mg / L, sulfide and cyanide The removal rates were 87.5% and 90%, respectively. The treated gas-generating sewage no longer has an inhibitory effect on the activated sludge microorganisms in the subsequent biological treatment unit, and the subsequent biological treatment unit operates stably....

example 2

[0040] Example 2: Gas-making sewage pretreatment project of company B, water volume to be treated: 100m 3 / h.

[0041] Comparison of water quality before and after treatment of gas-making sewage by this technology:

[0042] serial number index unit before processing after treatment Removal rate 1 pH 6-9 6.2-6.5 -- 2 Sulfide mg / L ≤50 ≤5 ≥90％ 3 cyanide mg / L ≤30 ≤3 ≥90％ 4 suspended matter mg / L ≤200 ≤60 ≥80％ 5 COD mg / L ≤3000 ≤2700 ≥10％

[0043] Before the treatment of this project, the sulfide of gas-making sewage: 50mg / L, cyanide: 30mg / L, after using this technology to treat, the sulfide of the system effluent: 5mg / L, cyanide: 3mg / L, the content of sulfide and cyanide The removal rates are 90% and 90%, respectively. The treated gas-generating sewage no longer has an inhibitory effect on the activated sludge microorganisms in the subsequent biological treatment unit, and the subsequent biological treat...

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Abstract

The invention discloses a synchronous desulfurization and decyanation method and device for gas-making sewage of the coal chemical industry. The method comprises the following steps: S1, conveying thegas-making sewage to a pipeline mixer through a sewage pump, and measuring the amount of the gas-making sewage flowing into the pipeline mixer through an electromagnetic flowmeter installed on a pipeline; and S2, measuring the pH value of the effluent of the pipeline mixer in real time by using an online pH meter, and adjusting the flow of an acid dosing metering pump through a PLC to guaranteedthat the pH value of the effluent of the pipeline mixer is controlled to be in a range from 6.2 to 6.5. According to the invention, the pH value of the gas-making sewage is adjusted, a certain proportion of ferrous sulfide is added to react with sulfide and cyanide in the gas-making sewage, and the sewage is separated from precipitates by virtue of an inclined tube precipitator, so sulfide and cyanide in the gas-making sewage are effectively removed, the biotoxicity of the gas-making sewage is eliminated, and the normal operation of a subsequent biological treatment unit is ensured.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for synchronous desulfurization and decyanation of coal chemical gas-making sewage and a device thereof. Background technique [0002] Coal chemical gas production sewage is the sewage produced when the gas scrubber and dust removal tower wash and cool the gas. The pollutant composition and concentration in the gas production sewage vary greatly with the gasification raw materials, operating conditions and other factors. It mainly contains sulfide, Pollutants such as cyanide, phenols, ammonia nitrogen, and suspended solids, and gas-generating sewage are generally treated by sewage treatment processes based on biological methods. The sulfide and cyanide in gas-making sewage have strong biological toxicity to activated sludge microorganisms. It is generally believed that when the sulfide concentration reaches 10 mg / L or the cyanide concentration rea...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/18
CPCC02F9/00C02F1/66C02F1/5245C02F2001/007C02F2101/101C02F2101/18
Inventor 李士安褚刚肖强张晓丽
Owner 德州金智环保科技有限公司
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