A kind of pu leather wastewater treatment method

A wastewater treatment and wastewater technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Problems such as low process efficiency, to achieve the effects of large water quality fluctuations, reduced operating costs, and good economic benefits

Active Publication Date: 2011-12-28
ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD
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Problems solved by technology

[0003] At present, the general PU leather wastewater treatment method adopts A / O (anaerobic-aerobic) or A2 / O (anaerobic-anoxic-aerobic) process. The concentration of ammonia nitrogen after oxygen decomposition is as high as 200-1000mg / l. The traditional denitrification process has low efficiency, weak impact load resistance, and high concentration of COD and ammonia nitrogen in the effluent. It is difficult to meet the current "Synthetic Leather and Artificial Leather Industrial Pollutant Discharge Standard" GB21902-2008 standard

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  • A kind of pu leather wastewater treatment method
  • A kind of pu leather wastewater treatment method
  • A kind of pu leather wastewater treatment method

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Embodiment Construction

[0030] Such as figure 1 Shown, a kind of PU leather wastewater treatment method of the present invention comprises the following steps:

[0031] Step 1: Classify and dispose of the wastewater in PU leather production

[0032] a. Collect PU leather wet-normal line wastewater, PU leather wet-normal line spray and absorption wastewater, PU leather dry-normal line spray and absorb wastewater, and PU leather wet-normal line equipment cleaning wastewater into high-concentration wastewater collection pool 1. Concentrated wastewater collection tank 1 is built separately or jointly according to the site, and its volume is greater than the maximum discharge of wastewater; the wastewater in high-concentration wastewater collection tank 1 is introduced into the DMF refining recovery system to recover DMF, and the recovered wastewater is collected into the tower top water collection tank , the water sump at the top of the tower is open and naturally cooled;

[0033] b. collecting the tow...

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Abstract

The invention discloses a PU (Poly Urethane)-leather wastewater-processing method, which comprises the following steps of: step 1, carrying out classified processing for wastewater in PU-leather production; step 2, carrying out biological preprocessing; step 3, carrying out high-efficiency ammonia-nitrogen blowing processing; step 4, carrying out coagulating-sedimentation processing; step 5, carrying out two-stage A1 / O1-A2 / O2 biological-denitrification processing; step 6, carrying out air-flotation processing; and step 7, carrying out mechanical-filtration processing. Through the PU-leather wastewater-processing method, COD (Chemical Oxygen Demand) and ammonia nitrogen in the wastewater can be removed, the wastewater being processed is ensured to be discharged after reaching standards, the problems of impacts of the high-concentration wastewater to a wastewater-processing system and the influence of biological-denitrifying capability reduction caused by the increase of ammonia-nitrogen concentration after the anaerobic hydrolysis of DMF (Dimethyl Formamide) in the wastewater are solved, the operating expenses are reduced, the wastewater processed can be used for production, and a good economic benefit is generated.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for treating PU leather wastewater. Background technique [0002] Wastewater in PU leather production mainly comes from PU leather dry normal line spray absorption wastewater, PU leather wet normal line production wastewater (coagulation tank DMF wastewater, coagulation tank cleaning wastewater, waste gas spray absorption system spray absorption wastewater), auxiliary Engineering production wastewater (water tanning wastewater, DMF rectification recovery system washing tower wastewater, tower top water, barrel washing wastewater, equipment cleaning wastewater, vacuum pump tail water, ground washing wastewater, desulfurization and dust removal cycle overflow wastewater and cooling tower overflow wastewater ), domestic water, etc. PU leather wastewater mainly contains COD (chemical oxygen demand), dimethylformamide (DMF), toluene (C 7 h 8 ), butanone (CH 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 佘浩郑展望
Owner ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD
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