EFFICIENT COMBINED ADVANCED TREATMENT METHOD OF ELECTROPLATING WASTE WATER

摘要

An efficient combined advanced treatment method of electroplating wastewater is disclosed, which belongs to the technical field of electroplating wastewater treatment. The method includes: after pretreatments including cyanide breaking, dechromisation and coagulating sedimentation, introducing the electroplating wastewater to a contact oxidation tank for biochemical treatment, and settling the effluent from the contact oxidation tank down in an inclined pipe of a secondary sedimentation tank to realize the separation of the sludge from water; charging the effluent to a coagulating sedimentation tank, and undergoing coagulating sedimentation with the aid of a flocculant and a coagulant aid added; feeding the effluent, as an influent, to a resin adsorption tank for adsorption with a magnetic resin; and after passing through a filter, flowing the effluent after adsorption to a fixed bed resin adsorption unit, so as to realize the discharge up to standard and recycle of the effluent.

主权项

1. An efficient combined advanced treatment method of electroplating wastewater, comprising:
(1) bio-contact oxidation: after subjecting the electroplating wastewater to pretreatments including cyanide breaking, dechromisation and coagulating sedimentation, introducing the effluent, as an influent, to a contact oxidation tank for biochemical treatment, and settling the effluent from the contact oxidation tank down in an inclined pipe of a secondary sedimentation tank to realize the separation of sludge from water, wherein after pretreatments, the quality indexes of the effluent are: the concentrations of the heavy metals Cu2+ and Ni2+: below 2.0 mg/L, the concentration of cyanide: below 2.0 mg/L, and COD: 80 to 200 mg/L; (2) coagulating sedimentation: charging the effluent from the step (1) to a coagulating sedimentation tank, and undergoing coagulating sedimentation with the aid of a flocculant and a coagulant aid added, to further remove the suspended solids, and the heavy metals Cu2+ and Ni2+ in the effluent after biochemical treatment; (3) magnetic resin adsorption: feeding the effluent from the step (2), as an influent, to a resin adsorption tank for adsorption with a magnetic resin; and (4) fixed bed resin adsorption: after passing through a filter, flowing the effluent from the step (3) to a fixed bed resin adsorption unit, to realize discharge up to standard or recycle of the effluent.