Combined treatment method of N, N-dimethylformamide (DMF) wastewater

A technology of dimethylformamide and a treatment method is applied in the field of environmental protection water pollution control, can solve the problems of low efficiency, difficult regeneration, secondary pollution and the like, and achieves the effects of economical treatment, avoiding secondary pollution and high degradation efficiency

Inactive Publication Date: 2013-12-18
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process combines physicochemical method and biological method to form a combined process of stripping-biological trickling filtration-biochemical method. This process realizes the efficient and economical treatment of DMF wastewater and solves the problems of existing adsorption, extraction, chemical oxidation, etc. The treatment method is prone to secondary pollution, difficult regeneration, low efficiency and other problems

Method used

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  • Combined treatment method of N, N-dimethylformamide (DMF) wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Take a certain volume of DMF wastewater, add 10g / L sodium hydroxide and enter the stripping tower, control the gas-liquid ratio to 1000:1, the reaction temperature is 25°C, the stripping reaction time is 1h, measure the TOC and DMF concentration, the experimental results are as follows:

[0029] project DMF (mg / L) TOC (mg / L) B / C Before blowing off 30186 28400 0.12 After blow off 16832 20500 0.34

[0030] 2. Biological trickling method: the residence time of dimethylamine gas in the tower is 60s, and the spray density of the spray liquid is 0.2m 3 / m 2 d, the reaction temperature is 25°C, air is introduced, and the device is operated for a period of time until the device is stable, and the concentration of dimethylamine at the inlet and outlet of the biological trickling filter is measured. The specific experimental results are as follows:

[0031] project Dimethylamine (mg / L) TOC (mg / L) before processing 985 ...

Embodiment 2

[0035] 1. Take a certain volume of DMF wastewater, add 20g / L sodium hydroxide and enter the stripping tower, control the gas-liquid ratio to 2000:1, the reaction temperature is 35°C, the stripping reaction time is 1.5h, measure the TOC of the wastewater before and after stripping and DMF concentration, the experimental results are as follows:

[0036] project DMF (mg / L) TOC (mg / L) B / C Before blowing off 30186 28400 0.12 After blow off 13510 16100 0.36

[0037] 2. Biological trickling method: the residence time of dimethylamine gas in the tower is 30s, and the spray density of the spray liquid is 0.25m 3 / m 2 d, the reaction temperature is 25°C, air is introduced, and the device is operated for a period of time until the device is stable, and the concentration of dimethylamine at the inlet and outlet of the biological trickling filter is measured. The specific experimental results are as follows:

[0038] project Dimethylamine (...

Embodiment 3

[0042] 1. Take a certain volume of DMF wastewater, add 30g / L sodium hydroxide and enter the stripping tower, control the gas-liquid ratio to 3000:1, the reaction temperature is 40°C, the stripping reaction time is 2h, measure the TOC and DMF concentration, the experimental results are as follows:

[0043] project DMF (mg / L) TOC (mg / L) B / C Before blowing off 30186 28400 0.12 After blow off 6737 14200 0.39

[0044] 2. Biological trickling method: the residence time of dimethylamine gas in the tower is 50s, and the spray density of the spray liquid is 0.2m 3 / m 2 d, the reaction temperature is 25°C, air is introduced, and the device is operated for a period of time until the device is stable, and the concentration of dimethylamine at the inlet and outlet of the biological trickling filter is measured. The specific experimental results are as follows:

[0045] project Dimethylamine (mg / L) TOC (mg / L) before processing 932 1...

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Abstract

The invention discloses a combined treatment method of N, N-dimethylformamide (DMF) wastewater, relates to the field of environment protection and water pollution treatment, and in particular relates to a combined treatment method for treating the N, N-DMF wastewater. The method specifically comprises the following steps: firstly decomposing the DMF wastewater into dimethylamine and formate under an alkali condition, then carrying out air stripping, introducing the dimethylamine waste gas generated in the air stripping into a bio-trickling tower for treatment, and directly carrying out biochemical treatment on the air-stripped wastewater. According to the combined treatment method disclosed by the invention, a physic-chemical method and a biological method are combined, a feasible process for treating the DMF wastewater is provided, the toxicity of the DMF wastewater is reduced by means of the physical-chemical method, the biodegradability of the DMF wastewater is improved, and the generated dimethylamine organic waste gas and wastewater are subjected to advanced treatment by means of the bio-chemical method. By adopting the combined treatment method disclosed by the invention, the effective and economical treatment of the DMF wastewater is achieved, and the problems of secondary pollution, difficult regeneration, low efficiency and the like easily caused by the existing treatment methods of adsorption, extraction, chemical oxidization and the like are solved.

Description

technical field [0001] The invention relates to a combined treatment method for N,N-dimethylformamide wastewater, which relates to the field of environmental protection and water pollution treatment, and in particular to a combined treatment method for N,N-dimethylformamide wastewater treatment. Background technique [0002] N,N-Dimethylformamide (DMF) is an organic solvent with stable chemical properties, high boiling point and excellent performance. It is widely used in synthetic leather production, polyacrylonitrile spinning, butadiene extraction and other processes. . There is a large amount of DMF in the wastewater discharged from the production process of chemical products, and the DMF-containing wastewater discharged by the leather industry alone is about 100 million tons every year. DMF is stable in nature, poor in biodegradability, can irritate and damage human eyes, and cause liver dysfunction. The United States has identified DMF as a possible carcinogen for huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/38
Inventor 沈树宝陈英文邱玉廖延广李兵
Owner NANJING TECH UNIV
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