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A Coal Chemical Wastewater Treatment Process

A technology for coal chemical wastewater and treatment process, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve high wastewater treatment costs, COD and ammonia nitrogen pollution, and total nitrogen removal Low efficiency and other problems, to achieve the effect of low energy consumption, electricity consumption and low cost of chemicals

Inactive Publication Date: 2015-12-09
SHANDONG ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These processes have solved the pollution problems of COD and ammonia nitrogen in wastewater to a certain extent, but the removal efficiency of total nitrogen in wastewater is low, and the traditional "nitrification-denitrification" mode of removing total nitrogen leads to higher wastewater treatment costs ( Mainly including the electricity consumption of biochemical treatment and the consumption of denitrification carbon source), the traditional anammox denitrification method needs to add nitrite to the wastewater, which increases the economic burden of coal chemical enterprises to a certain extent

Method used

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  • A Coal Chemical Wastewater Treatment Process
  • A Coal Chemical Wastewater Treatment Process
  • A Coal Chemical Wastewater Treatment Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Coal chemical wastewater from a synthetic ammonia coal chemical enterprise in Shandong, the index is: COD Cr 375mg / L, ammonia nitrogen 186mg / L, total nitrogen 213mg / L, SS136mg / L.

[0039] The above-mentioned coal chemical industry wastewater is treated by the following treatment process:

[0040] (1) Pass the coal chemical industry wastewater in the regulating tank into the coagulation sedimentation tank and add polyaluminum chloride and anionic polyacrylamide, the addition of polyaluminum chloride is 100mg / L, and the addition of anionic polyacrylamide is 1.5mg / L; After 4 hours of flocculation and sedimentation, coagulation sedimentation wastewater and sedimentation sludge were obtained;

[0041] (2) the coagulation sedimentation waste water that step (1) makes is passed in the air flotation machine, in the air flotation machine, add polyaluminum chloride and anionic polyacrylamide, the add-on of polyaluminum chloride is 100mg / L, The amount of anionic polyacrylamide a...

Embodiment 2

[0059] Wastewater from a coal chemical enterprise producing alcohol hydrocarbon ester products in Shandong, the index is: COD Cr 467mg / L, ammonia nitrogen 216mg / L, total nitrogen 264mg / L, SS237mg / L.

[0060] The above-mentioned coal chemical industry wastewater is treated by the following treatment process:

[0061] (1) Pass the coal chemical industry wastewater in the regulating tank into the coagulation sedimentation tank and add polyaluminum chloride and anionic polyacrylamide, the addition of polyaluminum chloride is 150mg / L, and the addition of anionic polyacrylamide is 1mg / L; After 5 hours of flocculation and sedimentation, coagulation sedimentation wastewater and sedimentation sludge were obtained;

[0062] (2) the coagulation sedimentation wastewater that step (1) makes is passed in the air flotation machine, adds polyaluminum chloride and anionic polyacrylamide in the air flotation machine, the add-on of polyaluminum chloride is 50mg / L, The amount of anionic polyacr...

Embodiment 3

[0080] Wastewater from a coal chemical enterprise producing coking in Shandong, the index is: COD Cr 3632mg / L, ammonia nitrogen 469mg / L, total nitrogen 657mg / L, SS461mg / L.

[0081] The above-mentioned coal chemical industry wastewater is treated by the following treatment process:

[0082] (1) Pass the coal chemical industry wastewater in the regulating tank into the coagulation sedimentation tank and add polyaluminum chloride and anionic polyacrylamide, the addition of polyaluminum chloride is 125mg / L, and the addition of anionic polyacrylamide is 1.25mg / L; After 4.5h of flocculation and sedimentation, coagulation sedimentation wastewater and sedimentation sludge were obtained;

[0083] (2) the coagulation sedimentation waste water that step (1) makes is passed in the air flotation machine, adds polyaluminum chloride and anionic polyacrylamide in the air flotation machine, the add-on of polyaluminium chloride is 75mg / L, The amount of anionic polyacrylamide added is 1.25 mg / ...

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Abstract

The invention relates to a high-efficiency energy-saving treatment process for coal chemical industry wastewater. The process comprises the following steps: (1) adding a flocculating agent into coal chemical industry wastewater in a regulating reservoir, performing flocculating settling, thereby preparing coagulating settling wastewater and settling sludge; (2) introducing the coagulating settling wastewater into an air floatation machine, thereby preparing air floatation wastewater and air floatation sludge; (3) respectively introducing the air floatation wastewater into a low oxygenic aeration activated sludge pool and a high oxygenic aeration activated sludge pool for treatment, thereby preparing low oxygenic aeration wastewater and high oxygenic aeration wastewater; (4) introducing the low oxygenic aeration wastewater into a secondary sedimentation tank (I), performing sludge and water separation, preparing aerobic biochemical effluent (I) and aerobic settled sludge (I), and refluxing the aerobic settled sludge (I) back into the low oxygenic aeration activated sludge pool; and (5) mixing the aerobic biochemical effluent (I) with aerobic biochemical effluent (II), treating the effluent in an anaerobic reaction tank, thereby preparing the treated wastewater. According to the process disclosed by the invention, total nitrogen in the wastewater can be efficiently removed, and the aims of saving energy and efficiently treating the wastewater are achieved.

Description

technical field [0001] The invention relates to a coal chemical wastewater treatment process, which belongs to the technical field of industrial wastewater treatment. Background technique [0002] The wastewater discharged by coal chemical enterprises is mainly high-concentration coal gas washing wastewater, which contains a large amount of toxic and harmful substances such as phenol, cyanide, oil, ammonia nitrogen, etc. Low refractory chemical wastewater. [0003] At present, my country's coal chemical wastewater has been selected and optimized through years of engineering practice, and has formed a treatment process dominated by biological treatment, such as SBR, A / O, A 2 / O, invert A 2 / O, CASS, etc. [0004] Chinese patent document CN102633359A (application number 201210119771.3) discloses a treatment method suitable for total nitrogen in nitrogen-containing chemical wastewater, the method includes pre-aeration tank treatment and two-stage A / O treatment process; the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 陈爱忠洪卫刘杰刘勃孙淑杰邹晓凤刘战修张涛王凯谭心
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI