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Pretreatment device for DMF (dimethyl formamide)-containing wastewater

A pretreatment device and wastewater technology, applied in water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of high cost and economic value of DMF recovery, secondary pollution, and low DMF concentration. Achieve stable treatment effect, increase service life, and improve biochemical performance

Inactive Publication Date: 2015-08-12
NANTONG DAHENG ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CH can be used for higher concentration DMF wastewater 2 Cl 2 , chloroform, dichlorobenzene, benzene, etc. are used as extractants to recover DMF, but the concentration of DMF targeted by this program is not high, the cost of recovering DMF is much greater than the economic value produced, and organic solvents may also cause secondary pollution

Method used

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  • Pretreatment device for DMF (dimethyl formamide)-containing wastewater
  • Pretreatment device for DMF (dimethyl formamide)-containing wastewater
  • Pretreatment device for DMF (dimethyl formamide)-containing wastewater

Examples

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Embodiment

[0032] The high-concentration DMF waste water of a certain food additives Co., Ltd. is passed into the water inlet pipe 4 of the reactor body 1 of the present invention, and alkali is added through the alkali dosing pipe 5 at the same time, and steam is passed into the reactor body 1 through the steam pipe 7 to carry out the process. Heating, using the air distribution pipe 6 inside the reactor body 1 to diffuse the steam, heating under this alkaline condition, when the wastewater reaches 60°C, DMF reacts with NaOH, after 30 minutes of degassing, DMF has been completely decomposed, and the wastewater after removing DMF is discharged Empty pipe is discharged.

[0033] Through experiments, we have concluded that the removal rate of DMF in this wastewater pretreatment device can reach 95%. And after alkaline hydrolysis treatment, the biochemical performance of wastewater is greatly improved.

[0034] The design principle of the present invention is to integrate the DMF-conta...

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Abstract

The present invention discloses a pretreatment device for DMF (dimethyl formamide)-containing wastewater. The device comprises a reaction body which is of a cuboid steel structure. An unloading opening which is fixedly communicated with an unloading pipe is formed in the side wall at the lower end of the body, and a steam inlet hole is formed in the side wall at the upper end of the body. A water inlet and an alkali feeding opening are formed in the top of the body, the water inlet is fixedly communicated with the water inlet pipe, and the alkali feeding opening is fixedly communicated with an alkali feeding pipe. A plurality of air distributing pipes which are arranged in parallel are mounted on the bottom face inside the body, a steam pipeline which is perpendicularly communicated among the plurality of air distributing pipes is an integrally formed L-shaped structure comprising a section communicated with the air distributing pipes and a section parallel to the side face of the body, and the steam pipeline is communicated with the end opening of the section parallel to the side face of the body and the steam inlet hole. According to the device disclosed by the present invention, the biodegradable performance of the treated wastewater can be greatly improved, and the treated wastewater does not cause a great influence on the surrounding environment and is directly discharged into air. The treatment effect is stable, and the subsequent bio-treatment is facilitated, and the device is simple in structure and convenient to mount and operate.

Description

technical field [0001] The invention relates to a wastewater pretreatment device, in particular to a DMF-containing wastewater pretreatment device. Background technique [0002] DMF: Chinese name: dimethylformamide, chemical formula:, molecular formula: C 3 h 7 NO, molecular weight: 73.09. [0003] Dimethylformamide (DMF) is an excellent organic solvent with high boiling point, low freezing point, and good chemical and thermal stability. It can be completely miscible with water, ethers, ketones, esters and other compounds. It is difficult to hydrolyze and other characteristics, so DMF is not easy to remove. In addition, DMF is biologically toxic and has an inhibitory effect on the subsequent biochemical treatment. Therefore, the wastewater containing DMF needs to be pretreated to remove DMF before subsequent related treatment. [0004] The main treatment goal of DMF-containing wastewater pretreatment is to remove DMF while reducing COD and improving biodegradability. DM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F101/34C02F101/38
Inventor 杨佳丽周爱霞李培王东升朱晓慧黄振宇王汉芹陈跃朱伟峰
Owner NANTONG DAHENG ENVIRONMENTAL ENG CO LTD
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