Sewage treatment process for recovering N-methyl pyrrolidone

A methyl pyrrolidone and sewage treatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of inability to meet discharge requirements, high concentration, complex components, etc. , to achieve the effects of reduced energy consumption, high mud age and short hydraulic retention time

Inactive Publication Date: 2020-03-20
镇江新纳环保材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These wastewaters need to be treated to meet the takeover standards of sewage treatment plants. These wastewaters have high concentrations of organic matter, complex components, stable structures, and contain a certain amount of toxic substances that inhibit biological growth. Direct biochemical treatment cannot meet the discharge requirements.

Method used

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  • Sewage treatment process for recovering N-methyl pyrrolidone

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Comparison scheme
Effect test

Embodiment 1

[0082] The sewage treatment process of N-methylpyrrolidone recovery is characterized in that the process comprises the following steps:

[0083] Step (1) high-concentration wastewater pretreatment; now the high-concentration wastewater is pretreated, and the pretreatment includes catalytic cracking, high-voltage pulse electrolysis and coagulation precipitation in turn; obtain pretreatment wastewater;

[0084] Step (2) biochemical treatment; the pretreated wastewater in step (1) is sequentially mixed and homogenized, anaerobic reaction, hydrolytic acidification and contact oxidation; biochemically treated water is obtained;

[0085] Step (3) guarantee treatment; the biochemically treated water in step (2) is subjected to precipitation reaction, multimedia filtration and activated carbon filtration in sequence to complete the recovery.

[0086] Further, the catalytic cracking in step (1) adopts "Fenton's reagent method"; Fe in Fenton's reagent 2+ As a homogeneous catalyst, whil...

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Abstract

The invention discloses a sewage treatment process for recovering N-methyl pyrrolidone. The sewage treatment process comprises the following steps: pretreating high-concentration wastewater, wherein the pretreating sequentially comprises catalytic cracking, high-voltage pulse electrolysis and coagulating sedimentation; obtaining pretreated wastewater; carrying out biochemical treatment; sequentially carrying out mixing homogenization, anaerobic reaction, hydrolytic acidification and contact oxidation on the pretreated wastewater in the step (1); obtaining biochemical treatment water; ensuringtreatment; and sequentially carrying out precipitation reaction, multi-medium filtration and active carbon filtration on the biochemical treatment water in the step (2) to finish recovery. The methodhas the advantages of low process cost, high efficiency, good recovery effect and good wastewater treatment effect, and can be widely popularized and used.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment process for recovering N-methylpyrrolidone. Background technique [0002] N-methylpyrrolidone, Chinese alias: NMP; 1-methyl-2-pyrrolidone; N-methyl-2-pyrrolidone. Colorless transparent oily liquid with slight amine odor. Low volatility, good thermal and chemical stability, can volatilize with water vapor. Hygroscopic. Sensitive to light. It is easily soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds. N-methylpyrrolidone is widely used in industries such as lithium batteries, medicine, pesticides, pigments, cleaning agents, and insulating materials. [0003] The current carbon nanotube slurry production wastewater contains N-methylpyrrolidone, and the carbon nanotube slurry production wastewater is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20C02F101/22C02F101/30C02F101/34C02F101/38
CPCC02F1/001C02F1/283C02F1/40C02F1/463C02F1/465C02F1/4672C02F1/4674C02F1/4678C02F1/5236C02F1/56C02F1/722C02F1/725C02F3/30C02F9/00C02F2101/20C02F2101/203C02F2101/206C02F2101/22C02F2101/30C02F2101/34C02F2101/38C02F2303/04C02F2305/026
Inventor 顾德华李亚东孙敏
Owner 镇江新纳环保材料有限公司
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