Heavy metal wastewater treatment process

Abstract

The invention discloses a heavy metal wastewater treatment process. The heavy metal wastewater treatment process comprises steps as follows: S1, wastewater is pumped into a pH regulating tank; S2, cation exchange resin is added, and cations are adsorbed; S3, the wastewater is pumped into a middle water tank, anion exchange resin is added, anions are adsorbed, and a supernatant liquid is drained upto standard or recycled; S4, wastewater at the bottom of the middle water tank is conveyed to a coagulating sedimentation reactor, the supernatant liquid is subjected to reduced pressure distillationtreatment at the low temperature, produced condensate is drained up to standard or recycled, and sludge at the bottom is discharged into a sludge tank; S5, a concentrated distillation liquid and thesludge are mixed and dewatered by a plate-and-frame filter press, and a sludge cake is outsourced and treated; S6, resin in S2 is reused, and metal copper or nickel is removed through an electrolyticreaction; S7, filter pressed effluent and electrolytic residual fluids are mixed and conveyed to the coagulating sedimentation reactor. By means of the scheme, heavy metal copper / nickel can be directly recovered, energy consumption is low, resin is easy to regenerate, and the effluent has good quality.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a heavy metal wastewater treatment process for electroplating copper-containing wastewater or electroplating nickel-containing wastewater. Background technique [0002] The effluent salinity of the traditional heavy metal wastewater treatment device is high, and the discharge water up to the standard is still harmful to the environment. The traditional heavy metal wastewater treatment device produces a large amount of metal sludge. The heavy metal content in the sludge is high, which is easy to cause secondary pollution. At the same time It also causes a lot of waste of resources. The traditional heavy metal wastewater treatment process involves evaporation and crystallization. The evaporation and crystallization device consumes a lot of energy, and the pipeline is easy to block during the evaporation and crystallization process. Based on the above defects and deficie...

AI Technical Summary

Problems solved by technology

[0002] The effluent salinity of the traditional heavy metal wastewater treatment device is high, and the discharge water up to the standard is still harmful to the environment. The traditional heavy metal wastewater treatment device produces a large amount of metal sludge. The heavy metal content in the sludge is high, which is easy to cause secondary pollution. At the same time It also causes a lot of waste of resources. The traditional heavy metal wastewater treatment process involves evaporation and crystallization. The evaporation and crystallization device consumes a lot of energy, and the pipeline is easy to block during the evaporation and crystallization process. Based on the above defects and deficiencies, it is necessary to improve the existing technology

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