Artificial leather effluent treating process

A waste water treatment and artificial leather technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as difficult to meet standards, difficult process treatment, complex overall composition of waste water, etc., to achieve The effect of good economic benefits

Active Publication Date: 2006-08-02
江苏中宜金大环保产业技术研究院有限公司
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Problems solved by technology

[0003] In addition to the high concentration of DMF, artificial leather wastewater also contains auxiliaries, dyes and other difficult-to-degrade pollutants. The overall composition of the wastewater is complex, and it is difficult to treat the process. It is difficult to meet the standard with a single physical and chemical method or biochemical method.
[0004] At present, the artificial leather wastewater treatment method generally mixes various wastewater together and adopts anaerobic-aerobic treatment process. This treatment process effluent COD, NH 3 -N concentration is high, it is difficult to meet the requirements of national discharge standards, the treatment of artificial leather wastewater must take into account the impact of a large amount of ammonia nitrogen produced after DMF anaerobic hydrolysis on biological treatment

Method used

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  • Artificial leather effluent treating process

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[0019] The main structures in the process flow of the artificial leather wastewater treatment method of the present invention include: the main types of wastewater are: ① collecting wastewater from washing towers, coagulation tanks, recycling tanks and recycling barrels, ② tower top water, and ③ other wastewater. A kind of artificial leather wastewater treatment method of the present invention comprises the following steps:

[0020] (1) Collecting pool: collect the wastewater from flushing tower water, coagulation tank, recycling tank and recycling barrel, and the volume of the collecting tank is not less than the maximum discharge of any kind of wastewater.

[0021] (2) Regulating pool 1: collect the top water, and adjust for 18 hours.

[0022] (3) Regulating pool 2: Collect mixed wastewater and adjust for 15 hours.

[0023] (4) DMF wastewater press filter system: The wastewater containing high concentration of DMF in the collected water passes through the filter press syste...

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Abstract

The artificial leather effluent treating process has different treating steps for different kinds of effluent with different COD and DMF concentrations. Effluent with high COD and DMF concentration is first treated in a DMF recovering system to recover DMF, then anaerobic treated and blown to eliminate generated ammonia nitrogen, and finally mixed with other low COD concentration effluent and further treated anaerobic/aerobic + coagulating precipitation process to reach the draining standard. The process has high treating effect, especially on high DMF content effluent.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, in particular to the treatment of artificial leather production wastewater. Background technique [0002] Artificial leather wastewater has complex components and large fluctuations in water quality. The wastewater mainly contains COD, SS, DMF (dimethylformamide) and other pollutants. Especially the concentration of COD and DMF in flushing tower wastewater is 30,000-100,000mg / L, and the concentration of COD and DMF in cleaning wastewater from coagulation tank, recovery tank and recovery barrel is about 15,000mg / L. The content of DMF in this kind of wastewater is relatively high, and DMF is an organic solvent with high price and high recovery value. The COD and DMF in the top water are about 1600mg / L, and the DMF content is still relatively high. After anaerobic hydrolysis of DMF, a large amount of ammonia nitrogen will be produced. [0003] In addition to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F101/30C02F101/38
Inventor 任洪强严永红
Owner 江苏中宜金大环保产业技术研究院有限公司
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