Zero-emission treatment method for high-concentration wastewater

Abstract

The invention relates to a zero-emission treatment method for high-concentration wastewater. The treatment method comprises the following steps: S1, adjusting the pH of the high-concentration wastewater, adjusting the pH after adding a reducing agent, performing coarse filtering, performing filtering again by the MCR technology, performing filtering and concentrating by using the STUF membrane system technology, and performing evaporating and separating to obtain an outlet water; and S2, performing coarse filtering on the outlet water, performing filtering by the MCR technology, performing ion-exchanging, performing carbon filtration and then successively performing UF membrane and tertiary reverse osmosis RO membrane treatment, wherein the RO produced water is recyclable water, and the ROconcentrated water is subjected to repeated S1and S2 treatment as high-concentration wastewater. The treatment method performs targeted treatment on high-concentration wastewater, and adopts an all-physical separation process technology which only introduces a small amount of external medicaments, the wastewater after treatment can reach the industrial reuse water standard, the conductivity is low, the membrane is not easy to be blocked, the wastewater reuse rate is 99% or more, only about 1% of waste liquid is produced after treatment, and thus zero-emission of wastewater can be realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a zero-discharge treatment method for high-concentration wastewater. Background technique [0002] Electroplating process wastewater contains a large amount of chelating agents, heavy metals, high COD and other pollutants. There are many types of chelation in wastewater, and it has a strong chelating ability for heavy metals such as nickel, and heavy metals such as nickel do not precipitate under alkaline conditions. Wastewater treatment is difficult, the cost is high, and the problem of not being able to meet the standards stably has always plagued the development of the electroplating industry. [0003] At present, electroplating wastewater is generally treated by pretreatment + UF + Ro membrane method, but this method has the disadvantages of high conductivity of the produced water and easy membrane blockage. [0004] Therefore, it is of great research s...

AI Technical Summary

Problems solved by technology

Wastewater treatment is difficult, costly, and the problem of not being able to meet the standards stably has been plagued by the development of the electroplating industry

[0003] At present, electroplating wastewater is generally treated by pretreatment + UF + Ro membrane method, but this method has the disadvantages of high conductivity of produced water and easy membrane clogging

Images