Application of membrane separation and recovery technology

[Abstract] This article briefly describes the usage conditions of membrane separation technology, combined with the water quality status of electroplating heavy metal wastewater, in order to achieve the growth of economic benefits in electroplating wastewater treatment, meet the requirements of scientific development concepts such as energy conservation, emission reduction, and clean production, and introduce comprehensive treatment and membrane separation technology into the field of electroplating wastewater recovery, We also provided a detailed introduction to our successful cases of applying membrane separation technology to various electroplating production sections in recent years. This article provides a comprehensive review of the economic and environmental benefits of membrane recovery systems, further demonstrating the necessity of promoting membrane separation technology as a clean production technology for electroplating in the industry. This article places clean production, low operating costs, and long-term economic and environmental benefits at the forefront of project engineering design. The main purpose is to ensure that the wastewater treatment and reuse system that will be put into operation meets the requirements of current and future technological innovation and continuous improvement of environmental standards. This article places clean production, low operating costs, and long-term economic and environmental benefits at the forefront of membrane separation system design, with the main purpose of ensuring that the system to be put into operation meets the requirements of current and future technological innovation and continuous improvement of environmental standards.

[Keywords] Membrane separation technology Energy conservation, emission reduction, clean production, circular economy

0 Overview

Electroplating wastewater contains heavy metal ions such as chromium, zinc, copper, cadmium, lead, nickel, etc. Among them, acids, alkalis, cyanide, chromium, etc. are highly toxic impurities, and some are highly toxic substances that cause cancer, distortion, and mutation. Therefore, strict treatment must be carried out before discharge to avoid causing harm.

Most electroplating enterprises can effectively control pollutants through the end pure chemical treatment method, but this comprehensive or mixed chemical treatment method of pollution first and then treatment has many problems and defects, especially in the absence of economic benefits and the occurrence of excessive emission events; The high investment and operating costs of governance are also important shortcomings of traditional chemical governance, and the uneconomical pollution control also brings a heavy burden to enterprises. Due to the large amount of heavy metal resources in electroplating wastewater, from an economic and environmental perspective, the comprehensive treatment process of electroplating wastewater using recycled metal and water resources for reproduction is the mainstream treatment approach for electroplating wastewater today.

The treatment of electroplating wastewater in China has a long and slow development process, and the late 1950s was the initial stage of electroplating wastewater treatment in China; From the 1960s to the mid-1970s, it began to receive attention, but it was still in the stage of pure emission control; From the mid-1970s to the 1980s, most electroplating wastewater had been effectively treated, and processes such as ion exchange and thin film evaporation and concentration were promoted and used nationwide. Reverse osmosis and electrodialysis also entered the stage of industrial use, and significant progress was made in the recovery and utilization of valuable substances in wastewater and water resources; From the 1980s to the 1990s, research began on technologies to fundamentally control pollution, and research on comprehensive prevention and control achieved gratifying results; Since the 1990s, the reform of electroplating wastewater treatment processes, recycling, and partial closed loop circulation have further developed towards comprehensive prevention and control. Diversified combination treatment combined with advanced automatic control has turned resource reuse technology into the main focus of electroplating wastewater treatment development