Self-reflux sludge nucleation electroplating wastewater heavy metal removal system and method

Abstract

The invention discloses a self-reflux sludge nucleation electroplating wastewater heavy metal removal system and method, and the system comprises a comprehensive raw water tank, a reaction unit, a first sedimentation tank and a self-reflux sedimentation tank which are sequentially connected through pipelines, and the first sedimentation tank is connected with the reaction unit through a pipeline; the self-reflux sedimentation tank is connected with the comprehensive raw water tank and the reaction unit through pipelines; the reaction unit is used for reducing and decomplexing heavy metal ions in the wastewater to be treated to obtain flocculate and treated wastewater; the first sedimentation tank is used for performing mud-water separation on the flocculate and the treated wastewater to obtain primarily separated sludge and primarily separated wastewater; and the self-reflux sedimentation tank is used for carrying out mud-water separation on the primarily separated wastewater to obtain secondarily separated sludge and secondarily separated wastewater. The electroplating wastewater heavy metal removal system is high in automation degree, high in heavy metal ion removal rate, short in technological process, low in equipment construction cost, high in system adaptability and capable of achieving resource recycling.

Description

technical field [0001] The invention relates to the technical field of water treatment engineering, in particular to a system and method for removing heavy metals from electroplating wastewater nucleated from returning sludge. Background technique [0002] Electroplating is to modify the surface of metal materials by electrochemical methods, change their physical or chemical properties, and obtain the required materials. The electroplating industry involves many heavy metal substances, which are very easy to cause harm to the ecological environment. According to relevant reports, the total amount of electroplating wastewater discharged by the electroplating industry is as high as billions of cubic meters each year. At the same time, the composition of the wastewater in the electroplating industry is complex. -2008), the discharge will cause certain harm to the surrounding ecological environment. [0003] The electroplating industry wastewater often uses chemical precipitati...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a self-reflux sludge nucleation electroplating wastewater heavy metal removal system and method for the above-mentioned defects of the prior art, aiming to solve the existing heavy metal ion removal rate in the electroplating industry wastewater treatment device Low cost, complex process, high equipment construction cost

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