Wastewater zero discharge system

Abstract

The invention relates to the technical field of wastewater treatment, especially to a wastewater zero discharge system. The system comprises a low concentration wastewater treatment system used for processing low pollutant concentration wastewater and a high concentration wastewater treatment system used for processing high pollutant concentration wastewater. The high concentration wastewater treatment system is provided with an evaporator which is used for evaporating treatment of high concentration wastewater from the high concentration wastewater treatment system. Low concentration wastewater formed by evaporating treatment of the evaporator is output to the low concentration wastewater treatment system. According to the system, high pollutant concentration wastewater and low pollutant concentration wastewater are separately treated, and only high concentration wastewater is evaporated. Thus, evaporation capacity of wastewater is minimized, and operating cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater zero discharge system. Background technique [0002] In the coating wastewater treatment system, the conventional zero-discharge process is that the comprehensive wastewater produced by the coating line undergoes physical and chemical pretreatment, is filtered by the filtration system, and then reused after pure water purification by the ultrafiltration system and reverse osmosis system. [0003] There are two main types of coating wastewater, one is the pre-degreasing and degreasing wastewater generated by the coating line, which has a small amount of water and a high concentration of pollutants. One is the washing water of the coating line, which has a large amount of water and a low concentration of pollutants. There are the following defects: waste water is not classified and collected, resulting in a less targeted treatment process, shortening the ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of large energy consumption and high cost in the comprehensive treatment of painting wastewater, and to provide a zero-discharge system for wastewater, which is characterized in that it includes a low-concentration wastewater treatment system for treating wastewater with low pollutant concentration, For the high-concentration wastewater treatment system for treating high-concentration wastewater, the high-concentration wastewater treatment system is provided with an evaporator; The formed low-concentration wastewater is output to the low-concentration wastewater treatment system

Images