Treatment method for removing zinc in electroplating wastewater

Abstract

The invention discloses a treatment method for removing zinc in electroplating wastewater. The wastewater is sequentially treated by a water collecting well, a coarse screen, a primary sedimentation tank, a pH value adjusting tank, a pulse high-voltage electricity-microbial flocculation reaction tank, an aeration oxidation tank, a biological denitrification tank, a secondary sedimentation tank anda water purification tank. According to the method, the microbial flocculation characteristics of common beer yeast and bacillus licheniformis are creatively utilized; the adsorption bridging characteristic of beer yeast and bacillus licheniformis to zinc ions is excited through a pulse high-voltage discharge process with a specific peak voltage value, so that the zinc ions in the wastewater aresubjected to flocculation reaction on the surfaces of the microorganisms to gradually form flocculate with a larger diameter, and finally, the flocculate is removed through a precipitation process. Meanwhile, the beer yeast and the bacillus licheniformis are common microorganisms, are easy to obtain and low in cost, thereby greatly reducing the material cost of wastewater treatment.

Description

technical field [0001] The invention relates to a treatment method for removing zinc ions in electroplating wastewater, which belongs to the field of wastewater treatment in environmental protection. Background technique [0002] With the rapid development of industrial production, heavy metal pollution in water is becoming more and more serious, among which zinc is one of the toxic pollutants in electroplating wastewater. After being directly discharged into the environment without treatment, zinc-containing wastewater can circulate through the food chain, reach a certain concentration level in some organisms, and eventually accumulate in the human body and endanger human health. Therefore, the development of economical and effective methods to control heavy metal pollution such as zinc has become an important content of current water pollution control, and more and more people pay attention to it. Methods for treating heavy metal pollution such as zinc in electroplating w...

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Problems solved by technology

Compared with the chemical precipitation method, the electrolysis method has the advantages of short cycle, low operating cost, and low energy consumption, which is beneficial to the recovery of zinc and salvage ineffectiveness, but the anode material iron consumes a lot and occupies a large area

[0008] At present, the existing zinc-containing electroplating wastewater treatment methods have the disadvantages of high cost, low efficiency, high energy consumption and secondary pollution.

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