Method for treating waste acetonitrile water with high salt content in zero-discharge mode and special device of method

A special device and high salt content technology, applied in the field of environmental engineering, can solve the problem of high oxygen utilization rate, achieve high oxygen utilization rate, strengthen biological denitrification, and start quickly

Pending Publication Date: 2019-07-05
NANJING FORESTRY UNIV
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  • Claims
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Problems solved by technology

[0006] Purpose of the invention: for the problems existing in the prior art, the purpose of the invention is to provide a method for zero-discharge treatment of high-salt acetonitrile waste water, utilize various microorganisms in the activated sludge to degrade acetonitrile, and adopt membrane separation to separate acetonitrile and The separation of inorganic salts effectively avoids the inhibition of microorganisms by inorganic salts entering the bioreactor; the separated acetonitrile molecules enter the membrane aerated bioreactor for biodegradation, and the membrane aerated bioreactor uses a silicone rubber membrane for membrane aeration , high oxygen utilization rate, can avoid the problem of secondary pollution caused by the stripping of volatile acetonitrile by bubble aeration, and has industrial application prospects

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  • Method for treating waste acetonitrile water with high salt content in zero-discharge mode and special device of method
  • Method for treating waste acetonitrile water with high salt content in zero-discharge mode and special device of method
  • Method for treating waste acetonitrile water with high salt content in zero-discharge mode and special device of method

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Experimental program
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Effect test

Embodiment 1

[0034] like figure 1Shown, is the integrated membrane aeration biological reaction system (IMABS) that is used for the highly saline acetonitrile waste water of zero discharge treatment, comprises feed liquid bottle 1, air compressor 5, membrane separator 10 and bioreactor 11; The liquid bottle 1 is connected to the tube side of the membrane separator 10 through the feed liquid pump 2 and the pipeline to form a loop; a membrane aeration zone 8 and a non-aeration zone 9 are arranged in the bioreactor 11, and the membrane separator 10 is set in the bioreactor 11. Inside the reactor 11, located below the membrane aeration zone 8, the air compressor 5 communicates with the membrane aeration zone 8 through a ball valve 6 and a pressure gauge 7; ceramsite is provided in the non-aeration zone 9.

[0035] The integrated membrane aeration biological reaction system uses the feed liquid pump 2 to flow the high-salt acetonitrile wastewater in the feed liquid bottle 1 from one end of the ...

Embodiment 2

[0041] The thickened sludge and an amount of salt-free acetonitrile waste water that will be retrieved are added in the reaction system of embodiment 1, so that the VSS of the sludge in the bioreactor is 3g / L, and the concentration of acetonitrile is 250mg / L. Under the conditions of 25±1°C, no circulation, no reflux, aeration pressure of 0.01MPa and membrane separator not activated, the bioreactor will be aerated for 2 days to domesticate the activated sludge, so that the membrane aeration area and the non-aeration area Different types of acetonitrile degrading bacteria as well as nitrifying and denitrifying bacteria are produced.

[0042] It was determined that the acetonitrile concentration in the IMABS bioreactor decreased to 17 mg / L after 2 days of stuffy exposure, and the TOC in the bioreactor continued to decrease from 185 mg / L to 20 mg / L, while the ammonia nitrogen concentration increased by 10 mg / L, indicating that the bioreactor Microbes in the reactor began to degrad...

Embodiment 3

[0045] Carry out the treatment of high-salt acetonitrile wastewater in the successfully started reaction system of embodiment 2, treatment condition is: high-salt acetonitrile wastewater 1L, acetonitrile concentration is 500mg / L, and salt content is 5% in terms of NaCl, and temperature is 25±1℃, the aeration pressure is 0.01MPa, the circulation ratio is 1, the reflux ratio is 1, HRT B 24h, HRT M It is 36min.

[0046] The reaction system was run for 5 days. It has been determined that the separation rate of acetonitrile in the membrane separator of IMABS is 40%, no acetonitrile is detected in the bioreactor, and the removal rate of acetonitrile is 100%. TOC, TN and ammonia nitrogen in the bioreactor of IMABS at the end of the working condition are respectively 0.8mg / L , 3mg / L and 2.6mg / L. By detecting the conductivity of high-salt acetonitrile wastewater in the feed bottle of IMABS, it was found that the conductivity in the feed bottle did not change significantly during the...

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Abstract

The invention discloses a method for treating waste acetonitrile water with high salt content in a zero-discharge mode and a special device of the method. A designed membrane aeration bioreactor system with the combination effect of two devices, namely a membrane reactor and a membrane aeration bioreactor is utilized, and acetonitrile in the waste acetonitrile water with the high salt content is separated and degraded. The method comprises the specific steps that the waste acetonitrile water with the high salt content is subjected to circulating separation treatment by the membrane separator,and the acetonitrile and salt water are obtained; the acetonitrile enters the membrane aeration bioreactor with a non-aeration area and a membrane aeration area for a degradation reaction, and water in the membrane aeration bioreactor flows back to the membrane separator for circulating separation of the acetonitrile; after acetonitrile separation by the membrane separator, the salt water can be further recycled. According to the method and the special device, the system adaptability is high, the operation is stable, it is effectively avoided that salt enters the membrane aeration bioreactor and inhibits microorganisms, zero-discharge treatment for the waste acetonitrile water with the high salt content is achieved, that is, the acetonitrile is completely separated and degraded, the salt water is recycled, there is no secondary pollution, and there is no waste water discharge of the system.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a treatment method for salt-containing acetonitrile wastewater, in particular to a zero-discharge method for treating high-saline acetonitrile wastewater and a special device thereof. Background technique [0002] The acetonitrile wastewater discharged by the fluorine chemical industry contains a lot of salt, which is a kind of high-salt toxic organic chemical wastewater with high organic content, volatile and strong toxicity. The existing acetonitrile wastewater treatment methods mainly include physical and chemical methods and biological methods. The physical and chemical method is mainly aimed at high-concentration acetonitrile wastewater, using the extensive solubility characteristics of acetonitrile to separate and recover it, and adding chemicals to destroy the azeotropic system of acetonitrile and other solvents to achieve the purpose of separation and reco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/38
CPCC02F3/12C02F1/44C02F2101/38
Inventor 梅翔李鹏鹏沈怡君郭中伟王一涵沈文天杨扬毕书祺刘娟丁洋吴宇欣
Owner NANJING FORESTRY UNIV
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