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Three-time sterilization technology for membrane-method recycling of printing and dyeing wastewater

A technology of printing and dyeing wastewater and membrane method, which is applied in the direction of sterilization/microdynamic water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., and can solve problems such as abnormal operation, difficult cleaning, and membrane pollution. Achieve the effect of strong killing effect, low cost and simple operation

Inactive Publication Date: 2016-05-04
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

When the membrane is reused, the membrane is often seriously polluted due to too many microorganisms. After the membrane is seriously polluted, it is difficult to clean and cannot operate normally.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] In this example, under the premise of normal pretreatment of printing and dyeing wastewater, oxidizing bactericide sodium hypochlorite is added to the biochemical flocculation tank for the first sterilization, and the residual chlorine is controlled at 0.1-0.3ppm, and the sterilization rate can reach More than 98%,

[0036] The killed microorganisms flow into the sedimentation tank;

[0037] Then add a reducing agent (the reducing agent is a reducing agent for reducing sodium hypochlorite, chlorine, etc., such as sodium sulfite) at the outlet of the sedimentation tank after the flocculation tank, and the dosage is 1-3ppm;

[0038] The water enters the reclaimed water tank, so that all residual chlorine can be reduced without causing membrane fouling.

[0039] Add non-oxidizing bactericide dodecyl dimethyl benzyl ammonium chloride to the water outlet of the medium water tank. The bactericide has a good bactericidal effect, and the dosage of 5-10ppm can remove more than ...

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Abstract

The invention provides a three-time sterilization technology for membrane-method recycling of printing and dyeing wastewater. The three-time sterilization technology is characterized in that sterilization treatment is conducted on printing and dyeing wastewater subjected to biochemical treatment for three times, wherein an oxidizing sterilizing agent is adopted as the sterilizing agent used in first-time sterilization, a non-oxidizing sterilizing agent is adopted as the sterilizing agent used in second-time sterilization, and an anionic sterilizing agent is adopted as the sterilizing agent used in third-time sterilization. According to the three-time sterilization technology for membrane-method recycling of the printing and dyeing wastewater, sterilization is conducted on printing and dyeing wastewater biochemical treatment effluent for three times through different sterilizing agents, microorganisms in water can be decreased to hundreds of or even dozens of microorganisms / ml from hundreds of thousands of microorganisms / ml, and the method is easy to operate and low in cost.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a three-time sterilization technology for membrane reuse of printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater is pretreated by flocculation and sedimentation after biochemical treatment, sand filtration, carbon filtration or ultrafiltration, and then enters reverse osmosis after being filtered by a security filter. Due to the existence of a biochemical system in the early stage, and the high temperature of printing and dyeing wastewater is suitable for the growth of microorganisms, the reverse osmosis influent water often contains microorganisms thousands or even hundreds of thousands of times higher than the requirements for membrane feed. When the membrane is reused, the membrane is often seriously polluted due to too many microorganisms. After the membrane is seriously polluted, it is difficult to clean and cannot operate normally....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/50
Inventor 张金山夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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