Electroplating wastewater zero discharge treatment system

Abstract

The invention discloses an electroplating wastewater zero-discharge treatment system, and belongs to the technical field of electroplating wastewater treatment. The electroplating wastewater zero discharge treatment system comprises a pretreatment system, a membrane treatment system, a purification and sterilization (EDI + UV) system and an evaporation, concentration and drying system, wherein the pretreatment system comprises an air flotation separation system and a reduction separation system, and a membrane separation system comprises a 1# membrane separation system and a 2# membrane separation system. According to the invention, wastewater containing nickel and wastewater containing chromium are treated separately, the reverse osmosis concentrated water of the 1# membrane separation system and the 2# membrane separation system flows to the evaporation, concentration and drying system, the distillate of the evaporation, concentration and drying system returns to the air flotation separation system to be circularly treated, the hazardous waste of the evaporation, concentration and drying system is subjected to outsourcing treatment, and the reverse osmosis fresh water of the 1# membrane separation system and the 2# membrane separation system flows to a fresh water storage tank, is purified and sterilized and then flows to a pure water storage tank. According to the invention, wastewater is greatly recovered and reused, the water quality of produced water is stabilized, and the sludge production amount and the hazardous waste treatment cost are reduced.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment, in particular to a zero-discharge treatment system for electroplating wastewater. Background technique [0002] The electroplating production process produces a large amount of wastewater containing heavy metals, acids, alkalis and high COD organic matter, which is very harmful to the environment and must be strictly treated to meet the standards before it can be discharged. Moreover, the electroplating production process consumes a lot of water resources. [0003] Traditional chemical methods, electrolytic methods and other methods of treating electroplating wastewater, because a certain amount of chemicals are added in the treatment process, even if heavy metals, COD (chemical demand) and other items meet the discharge standards, but in the treated wastewater, TDS ( Dissolved solids / total salt content) is difficult to meet the discharge standard of less than 1600 sti...

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Problems solved by technology

[0002] The electroplating production process produces a large amount of wastewater containing heavy metals, acids, alkalis, and high-COD organic matter, which is very harmful to the environment and must be strictly treated to meet the standards before it can be discharged, and the electroplating production process consumes a lot of water resources

[0003] Traditional chemical methods, electrolytic methods and other methods of treating electroplating wastewater, because a certain amount of chemicals are added in the treatment process, even if heavy metals, COD (chemical demand) and other items meet the discharge standards, but in the treated wastewater, TDS ( Dissolved solids / total salt content) is difficult to meet the discharge standard of less than 1600 stipulated by the state (although this indicator is not mandatory in many places), such long-term discharge will lead to salinization of water and soil, and the consequences are equally serious

[0004] In the currently disclosed zero-discharge treatment process of electroplating wastewater, there are varying degrees of high energy consumption in the evaporation process, high operating costs, low water reuse rate, low water quality, and long-term recycling of water is prone to produce microorganisms that cause odor and deterioration. Regular replacement of new water and other issues

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