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Biochemical method for pre-treating coal gasification wastewater through denitrification

A coal gasification wastewater and denitrification technology, which is applied in chemical instruments and methods, multi-stage water treatment, natural water treatment, etc., can solve the problems of large investment, long hydraulic retention time, high operating cost, etc., to improve mass transfer rate, The effect of changing the structure of organic matter and improving biodegradability

Inactive Publication Date: 2017-09-26
CHINA TIANCHEN ENG +1
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  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the operation cases that the above process can remove most of the pollutants in the wastewater and reduce the toxicity of the wastewater, but the effluent still contains a large amount of organic matter and ammonia nitrogen, and the effluent is far from meeting the reuse or discharge standards, and is vulnerable to incoming water quality, The impact of water volume fluctuations causes the system processing efficiency to drop sharply, and it takes a long time to return to normal
These processes also have the problem of too long hydraulic retention time, resulting in large project area, large investment and high operating costs.

Method used

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  • Biochemical method for pre-treating coal gasification wastewater through denitrification
  • Biochemical method for pre-treating coal gasification wastewater through denitrification
  • Biochemical method for pre-treating coal gasification wastewater through denitrification

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specific Embodiment approach

[0025] A new type of coal gasification wastewater treatment system in this embodiment includes anoxic denitrification tank (A1), aerobic decarbonization tank (O1), anaerobic hydrolysis tank (A2) and aerobic nitrification tank (O2) connected in sequence. ).

[0026] Among them, the effective reaction volume of the anoxic denitrification tank (A1) is 6L, and the HRT is 18h. It adopts the operation mode of biological fixed bed + stirring, and the upper and lower sides of the fixed bed inside the nitrification tank are respectively equipped with stirring blades.

[0027] The aerobic decarburization tank (O1) is filled with BF elastic filler, the filling ratio is 70%, the effective reaction volume is 8L, and the HRT is 24h; an online DO detection interlocking control aeration device is installed to maintain a low dissolved oxygen concentration in the tank (DO 0.5~ 1mg / L).

[0028] The design parameters of the intermediate settling tank and the secondary settling tank are the same,...

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Abstract

The invention belongs to a method for efficiently treating coal gasification wastewater in a biochemical mode. Specifically, a logical sequence of units in a conventional A2O2 process is re-arranged according to pollutant removal characteristics; reaction conditions are improved, removal efficiency, on a respective specific pollutant, of each unit is improved, efficient removal of the pollutants in wastewater is realized by a system, and water quality of outlet water is improved.

Description

technical field [0001] The invention belongs to a method for highly efficient biochemical treatment of coal gasification wastewater, specifically, the traditional A 2 o 2 The logical sequence of each unit in the process is rearranged according to its pollutant removal characteristics, and the reaction conditions are improved to strengthen the removal efficiency of each unit for its own characteristic pollutants, realize the efficient removal of pollutants in the system, and improve the quality of effluent water. Background technique [0002] Lurgi coal gasification waste water is the waste water produced in the process of producing coal gas by using the Lurgi furnace crushed coal pressurized gasification process, in which the water vapor entrained in the raw coal gas passes through the primary condenser and the cooling water formed is called residual ammonia water , containing high concentrations of phenol, ammonia, cyanide and tar, etc., which are the most important source...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/16C02F101/30C02F103/36
CPCC02F3/30C02F3/302C02F2101/16C02F2101/30C02F2103/36C02F2301/046C02F2301/08
Inventor 王子兴谭中侠宋海龙花绍龙田涛陈晨邢艳梅刘文杨琦武
Owner CHINA TIANCHEN ENG
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