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Combined silicon removal and hardness removal technological method for coal-gasification wastewater

A technology of coal gasification wastewater and process methods, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as pipeline scaling and blockage, biofilm pollution, and affecting normal production. Achieve the effect of low equipment investment and operation cost, simple operation and good effect

Inactive Publication Date: 2018-11-16
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention aims to propose a coal gasification wastewater combined silicon removal and hardening process to overcome the above-mentioned defects in the treatment of coal chemical gasification wastewater, and reduce the silicon content and hardness in the wastewater to 30 mg / L and 30 mg / L respectively. Below 500mg / L, to avoid problems such as pipeline fouling and blockage, serious biofilm pollution, and serious impact on normal production during subsequent treatment, and ultimately achieve the purpose of reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A coal gasification wastewater combined desiliconization and hardening process, comprising the following steps:

[0031] 1) Change the volume of the tank so that the residence time of coal gasification wastewater (silicon content is 80mg / L, hardness is 1000mg / L; the flow rate entering reaction tank A is 100L / h) in reaction tank A, reaction tank B and clarification tank Respectively 5min, 5min, 5min, reaction tank A and reaction tank B start stirring, the speed is 100r / min;

[0032] 2) adding aluminum oxide into the reaction tank A at a constant speed, the mass ratio of the added amount to the silicon content in the coal gasification wastewater is 2;

[0033] 3) Potassium carbonate, polyferric sulfate, and aluminum chloride were added to the reaction tank B at a uniform speed at the same time, and the mass ratio of the added amount to the hardness in the wastewater was 0.1, 0.5%, and 0.5% respectively;

Embodiment 2

[0035] A coal gasification wastewater combined desiliconization and hardening process, comprising the following steps:

[0036] 1) Change the volume of the tank so that the residence time of the coal gasification wastewater (the silicon content is 260mg / L, the hardness is 2000mg / L; the flow rate entering the reaction tank A is 200L / h) in the reaction tank A, the reaction tank B and the clarification tank Respectively 30min, 30min, 60min, reaction tanks A and B start stirring, the speed is 300r / min;

[0037] 2) adding magnesium chloride into the reaction tank A at a uniform speed, the mass ratio of the added amount to the silicon content in the coal gasification wastewater is 10;

[0038] 3) Add sodium hydroxide, polyaluminum chloride, and ferric chloride into the reaction tank B at a uniform speed at the same time, and the mass ratios of the added amount to the hardness in the wastewater are 3, 3%, and 3%, respectively.

Embodiment 3

[0040] A coal gasification wastewater combined desiliconization and hardening process, comprising the following steps:

[0041] 1) Change the volume of the tank so that the residence time of the coal gasification wastewater (the silicon content is 100mg / L, the hardness is 1500mg / L; the flow rate entering the reaction tank A is 150L / h) in the reaction tank A, the reaction tank B and the clarification tank Respectively 10min, 5min, 5min, reaction tanks A and B start stirring, the speed is 150r / min;

[0042] 2) adding magnesium hydroxide into the reaction tank A at a uniform speed, the mass ratio of the added amount to the silicon content in the coal gasification wastewater is 5;

[0043] 3) Potassium hydroxide, potassium aluminum sulfate, and magnesium chloride are added into the reaction tank B at a uniform speed at the same time, and the mass ratio of the added amount to the hardness in the wastewater is 1, 2%, and 1% respectively;

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Abstract

The invention provides a combined silicon removal and hardness removal technological method for coal-gasification wastewater. The technological method comprises the following steps: firstly, adding anagentia A into the coal-gasification wastewater; secondly, simultaneously adding an agentia B, an agentia C and an agentia D into the coal-gasification wastewater subjected to the treatment in the first step; thirdly, standing and clarifying the coal-gasification wastewater subjected to the treatment in the second step. The combined silicon removal and hardness removal technological method for the coal-gasification wastewater, provided by the invention, has the advantages of simple operation, short process flow and low cost; silicon and the hardness in the wastewater can be better removed atnormal temperature and pressure and good economic prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical wastewater treatment, and in particular relates to a coal gasification wastewater combined silicon removal and hardening process method. Background technique [0002] my country has abundant coal resources, how to use them cleanly and efficiently has always been one of the key research areas of scientific researchers. At present, coal gasification is the main way of efficient and comprehensive utilization of coal. However, the process of coal gasification will produce a large amount of highly polluting wastewater, which not only contains organic matter, ammonia nitrogen and other pollutants, but also contains suspended solids, hardness, silicate, etc. Most of the coal chemical industry projects are located in areas rich in coal resources but scarce in water resources. The capacity of the water environment is insufficient, and the water problem has become a bottleneck restricting the developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/5236C02F1/56
Inventor 杨克俭刘文陈晨刘耀斌王聪卞明高朝阳谭中侠凌连群殷建为王军邵博刘尧宋海龙
Owner CHINA TIANCHEN ENG
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