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Double-reflux denitrification membrane-bioreactor (MBR) process for treating dry acrylic fiber waste water

A dry-process acrylic fiber and double-reflux technology, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of incomplete nitrification and denitrification process and increase engineering sewage treatment facilities Infrastructure costs and operating costs, the total nitrogen content of the effluent cannot meet the standards, etc.

Inactive Publication Date: 2011-07-06
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

Due to the incomplete ammonification, nitrification and denitrification process, the effluent still contains a certain amount of nitrate and nitrogen-containing organic matter, the total nitrogen content of the effluent cannot reach the standard, and the high reflux ratio greatly increases the infrastructure cost and cost of the actual engineering sewage treatment facilities. operating costs

Method used

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  • Double-reflux denitrification membrane-bioreactor (MBR) process for treating dry acrylic fiber waste water
  • Double-reflux denitrification membrane-bioreactor (MBR) process for treating dry acrylic fiber waste water

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Embodiment example

[0020] Using the above embodiment as a biochemical treatment unit to treat the effluent from the anaerobic pond of a dry-process acrylic fiber factory in Northeast China, the full analysis shows that the refractory nitriles, nitrogen-containing heterocycles, alkanes and amino organic compounds in the effluent account for more than 86%. , influent COD Cr 950~1200mg / L, BOD 5 150~300mg / L, NH 4 + -N is about 80mg / L, TN is about 160mg / L, B / C is 0.15~0.25, which is difficult for biodegradable wastewater. The size of the reactor is: L 48cm×B 37cm×H 65cm, V 前置缺氧池 :V 好氧池 :V 后置缺氧池 :V 膜分离池 =1:4:1:1.5, the total effective volume is 99L, the reflux ratio of the nitrifying liquid in the aerobic tank is 150%, the reflux ratio of the sludge concentrate in the membrane separation tank is 70-100%, and the total residence time is 30h. Effluent COD 190~360mg / L, NH 4 + -N<5mg / L, TN 30~40mg / L, the average COD removal rate is 70~80% COD, the ammonia nitrogen removal rate is over 97%, and th...

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Abstract

The invention belongs to a double-reflux denitrification membrane-bioreactor (MBR) process for treating dry acrylic fiber waste water, mainly aiming at treatment of high organic nitrogen with denitrification requirement and petrified dry acrylic fiber waste water which is difficult to degrade. The process comprises the following steps: feeding petrified dimethylformamide (DMF) dry acrylic fiber waste water into a front anoxic pool 2 from a water inlet 1, converting partial organic nitrogen into ammonia nitrogen under the anoxic condition, carrying out denitrification on a nitration liquid 10 refluxing to the front anoxic tank 2 by fully utilizing a waste water carbon source, and simultaneously compensating basicity 3 to the waste water; and then feeding entering the waste water into an aerobic pool 4, carrying out organism aerobic oxidation, organic nitrogen aerobic oxidation and ammonia nitrogen nitration under the abundant basicity, wherein the effluent contains a large amount of nitrates; refluxing the partial effluent to the front anoxic pool 2 for denitrification, and feeding the other effluent into a membrane separation pool 7; carrying out denitrification by utilizing an additionally arranged carbon source; and sucking with a micro-filter membrane assembly 8 so as to generate effluent 9, and refluxing a sludge concentrated liquid 11 to the front anoxic pool 2. The process is high in nitrogen removal efficiency.

Description

technical field [0001] The invention belongs to a membrane bioreactor treatment process, mainly aimed at the treatment of high organic nitrogen and refractory petrochemical dry-process acrylic fiber wastewater with denitrification requirements, and specifically a double-reflux denitrification MBR process for treating dry-process acrylic fiber wastewater. Background technique [0002] The composition of petrochemical dry-process acrylic fiber wastewater is extremely complex, due to the addition of dimethylformamide (DMF), acrylonitrile (AN), methyl acrylate (MA), sodium styrene sulfonate (SSS), sulfur dioxide, EDTA, nonyl There are more than 20 kinds of raw materials and additives such as phenol polyoxyethylene ether, and various high polymers (polyacrylonitrile) and by-products of different molecular weights are produced at the same time during the polymerization reaction. Therefore, there are more pollutants in acrylic fiber wastewater, up to more than 40 kinds. , mainly co...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 田智勇杨崇臣宋永会崔荣涛涂响钱锋魏健李斌
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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