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Biochemical method for treating synthetic leather wastewater containing dimethylformamide

A technology of dimethylformamide and synthetic leather, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high production costs, achieve good removal effect, good Enrichment effect, effect of high removal potential

Active Publication Date: 2014-04-02
NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"Environmental Pollution and Prevention" 2009, 31 (3) 48-51, Deng Haihua, Shen Bin, etc.: "Research on Biointensive Treatment of High Ammonia Nitrogen Tannery Wastewater in Aerated Biological Fluidization Pool", through the addition of high-efficiency denitrification microbial agents Bioaugmentation technology treats high-ammonia-nitrogen wastewater, and the treatment of high-ammonia nitrogen tannery wastewater has achieved good treatment results, but this process requires a large number of high-efficiency strains, but the cultivation of specific high-efficiency strains requires high production costs

Method used

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  • Biochemical method for treating synthetic leather wastewater containing dimethylformamide
  • Biochemical method for treating synthetic leather wastewater containing dimethylformamide
  • Biochemical method for treating synthetic leather wastewater containing dimethylformamide

Examples

Experimental program
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Embodiment 1

[0046] A synthetic leather tanning company, a large-scale enterprise with an annual output of 240,000 meters of PU leather, has a wastewater discharge of about 80,000 tons per year. The characteristics of its wastewater are quite representative in the domestic tanning industry. The original process is hydrolysis + contact oxidation + Coagulation and sedimentation, the effluent index is ammonia nitrogen 150-180mg / L, of which the ammonia nitrogen exceeds the standard seriously. But apply the biochemical method of the present invention, the pollutant index that comprises total nitrogen, ammonia nitrogen all can reach standard discharge, and concrete processing step is:

[0047]Step 1: Pass the synthetic leather wastewater containing dimethylformamide to be treated into a membrane bioreactor with an aerobic sludge-anaerobic filler structure, and control the influent water quality index of the synthetic leather wastewater to: CODcr is 166-1276mg / L, ammonia nitrogen is 169-311mg / L,...

Embodiment 2

[0054] A synthetic leather tanning company discharges about 50,000 tons of wastewater per year, and its ammonia nitrogen cannot meet the standard all year round, and the ammonia nitrogen exceeds the standard seriously. Applying the biochemical method of the present invention, the pollutant indicators including total nitrogen and ammonia nitrogen can reach the discharge standard, and the specific processing steps are:

[0055] Step 1: Pass the synthetic leather wastewater containing dimethylformamide to be treated into a membrane bioreactor with an aerobic sludge-anaerobic filler structure, and control the influent water quality index of the synthetic leather wastewater to: CODcr is 166-1276mg / L, ammonia nitrogen is 169-311mg / L, total nitrogen is 203-360mg / L all can, in the present embodiment, influent water quality index is as shown in table 2, the membrane bioreactor of this aerobic sludge-anaerobic packing structure Including aerobic zone 5 and anaerobic zone 6, the aerobic...

Embodiment 3

[0062] A synthetic leather tanning company discharges about 50,000 tons of wastewater per year, and its ammonia nitrogen cannot meet the standard all year round, and the ammonia nitrogen exceeds the standard seriously. Applying the biochemical method of the present invention, the pollutant indicators including total nitrogen and ammonia nitrogen can reach the discharge standard, and the specific processing steps are:

[0063] Step 1: Pass the synthetic leather wastewater containing dimethylformamide to be treated into a membrane bioreactor with an aerobic sludge-anaerobic filler structure, and control the influent water quality index of the synthetic leather wastewater to: CODcr is 166-1276mg / L, ammonia nitrogen is 169-311mg / L, total nitrogen is 203-360mg / L all can, in the present embodiment, influent water quality index is as shown in table 3, the membrane bioreactor of this aerobic sludge-anaerobic packing structure Including aerobic zone 5 and anaerobic zone 6, the aerobic...

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Abstract

Disclosed is a biochemical method for treating synthetic leather wastewater comprising dimethylformamide. The present invention relates to the field of wastewater treatment. The biochemical method comprises the following steps: introducing to-be-treated synthetic leather wastewater into a new membrane bioreactor with an aerobic sludge-anaerobic packing structure, the new membrane bioreactor comprising an aerobic zone and an anaerobic zone; firstly enabling the to-be-treated synthetic leather wastewater to enter the aerobic zone in which specifically domesticated activated sludge with nitrifying bacteria as a dominant bacterial community is used, controlling the sludge return ratio of the aerobic zone to 100 to 300%, and adjusting the pH value of the aerobic zone to 8 to 9; enabling the synthetic leather wastewater treated in the aerobic zone to enter the anaerobic zone which is filled with a suspended filler and has a volumetric ratio of 30 to 60%; and discharging the synthetic leather wastewater treated in the anaerobic zone from the new membrane bioreactor with the aerobic sludge-anaerobic packing structure. By using the method of the present invention, the ammonia nitrogen and total nitrogen of outflow water can stably reach the Discharge Standard of Synthetic Leather and Artificial Leather Industrial Pollutants (GB21902-2008).

Description

technical field [0001] The invention relates to the technical field of synthetic leather and tannery wastewater treatment, more specifically, the invention relates to a biochemical method for treating synthetic leather wastewater containing dimethylformamide. Background technique [0002] Synthetic leather wastewater generally comes from the following streams of wastewater: water mixing wastewater, CODcr300-1500mg / L, ammonia nitrogen is less than 50mg / L; washing tank water, CODcr10000-20000mg / L, this wastewater enters the recovery system; tower washing wastewater , between CODcr5000~20000mg / L, ammonia nitrogen is less than 100mg / L; tower top water is used as product production water, so this kind of waste water is basically not discharged; ground water and bucket washing water, CODcr10000~20000mg / L; spraying water, very difficult processing, discontinuous discharge. [0003] DMF (dimethylformamide) is used in the surface treatment of PU synthetic leather, and the chemical f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/30C02F3/305C02F3/301C02F2101/38
Inventor 王庆丁原红任洪强王艳茹任鑫坤刘敏敏
Owner NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST
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