Processing method for performing standard treatment on electroplating wastewater and recycling heavy metal in water

Abstract

The invention discloses a processing method for performing standard treatment on the electroplating wastewater and recycling a heavy metal in the water. The processing method comprises a split-flow pretreatment step and additionally comprises the following steps: (a) removing and recycling the heavy metal: removing the heavy metal in the electroplating wastewater split-flow pretreated by an electrocoagulation float-down method and a coagulation film filtering method, and recycling the heavy metal reaction product in the electroplating wastewater; (b) removing the residual difficultly-decomposed organic matters: removing the residual difficultly-decomposed organic matters in the electroplating wastewater of step (a) in which plenty of heavy metals are removed and recycled by an oxidizing technology, a biological fluidizing technology and an absorbing technology, and further enriching the low-concentration electroplating wastewater, separating the standard effluent which can be directly discharged, and rinsing to generate the high-concentration electroplating wastewater; and (c) standard treating the condensed effluent: desalting the enriched high-concentration electroplating wastewater in step (b) by a limit integrated membrane system, and separating the standard concentrated solution which can be directly discharged and the standard recovery solution which can be directly standardized and recycled.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment, in particular to a process method for treating electroplating wastewater up to the standard and recovering heavy metals in the water. Background technique [0002] The electroplating industry is an important processing industry in my country. At present, galvanizing, copper plating, chrome plating and nickel plating are distributed in machine manufacturing, light industry, electronics, aviation and instrumentation manufacturing; it is understood that the annual discharge of electroplating wastewater in the country More than 400 million tons have caused serious environmental pollution. With the official implementation of the new "Electroplating Pollutant Discharge Standard" (GB21900-2008), the pollution emission control requirements of the electroplating industry have become more stringent. According to preliminary statistics, about 60% of electroplating enterprises in ...

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Problems solved by technology

[0004] 1. Generally, the content of heavy metals in electroplating wastewater is low, and the amount of water treatment is large, resulting in a large amount of chemical dosage, which is easy to cause secondary pollution;

[0005] 2. The process equipment occupies a large area, the operation cost is high, and the fixed investment is relatively large;

[0006] 3. The technological operation process is more complicated and the operation is more difficult;

[0007] 4. Most of the existing processes for the treatment of electroplating wastewater cannot effectively recover the low-concentration metals in the wastewater, and at the same time cannot effectively realize the reuse of electroplating wastewater, resulting in serious secondary pollution;

[0008] 5. The promulgation and implementation of the new electroplating pollutant discharge standard (GB21900-2008) has made the electroplating industry's pollutant discharge standard increasingly strict, and some of the existing domestic electroplating wastewater treatment technologies have been unable to meet the requirements of the new discharge standard

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