Zero discharge and circular utilization method of industrial effluent in regeneration treatment

Abstract

The invention discloses a method for reproduction treatment and zero discharge and recirculation utilization of industrial wastewater, which contains pretreatment, membrane separation, condensation liquid treatment and reflux, and sludge treatment. The pollution index of high concentration industrial wastewater pretreated SDI is less than or equal to 5; according to the requirement of clear-water quality, being separated by nano filter membrane or reverse osmosis membrane, the water applies for industrial production after disinfection; condensation liquid flows back and circulates, and is used for inverse / positive washing multiple-media filtrator, the washing condensation liquid flows back and circulates after flowing into A / O pool and generating anaerobic-aerobic reaction; sludge is dewatered to mud cake and delivered out, while the water flows back and circulates. Compared with the prior art, with the invented process, after regenerating treatment to the high concentration industrial wastewater, the produced water comes up to the requirement for clear-water used for industrial production and can be applied for production directly, which realizes the zero discharge and recirculation utilization of the industrial wastewater, and the water cost of regenerating treatment is lower than the integrated cost prior industrial water.

Description

technical field [0001] The invention relates to a zero-discharge recycling method for regeneration treatment of industrial sewage, especially high-concentration industrial sewage. Background technique [0002] my country is a water-poor country, and the per capita water resources are only 1 / 4 of the world's average level, and the water environment pollution is very serious. Half of the rivers in the country's seven major water systems are polluted, and the urban rivers are more polluted. The severe situation of "shortage of water in the south of the Yangtze River". At present, the total annual discharge of sewage (waste) water in our country is nearly 50 billion tons, of which the treated discharge is less than 50%, and a large amount of industrial sewage is directly discharged into rivers without treatment. In particular, industrial enterprises in papermaking, printing and dyeing industries are both major water users and major polluters: they take a large amount of water fr...

AI Technical Summary

Problems solved by technology

However, the disadvantage of these technologies is that the comprehensive cost of water production is relatively high due to the use of the discharged wastewater after the tertiary treatment of the sewage treatment plant as the treatment water source, because the treatment cost of treating the sewage into the discharged wastewater needs to be added

This technology overcomes the above-mentioned technical deficiencies, instead of using the wastewater after the third stage treatment, the sewage after the first stage treatment is used as the water source for treatment, which partially reduces the overall cost of water production. However, this technology is suitable for the treatment of wastewater generated by iron and steel enterprises. It is very suitable for sewage treatment of other large water-consuming enterprises such as papermaking, printing and dyeing; at the same time, reverse osmosis membrane separation is used in membrane separation technology, so that the comprehensive cost of water production is much higher than that of nanofiltration membrane

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