A Composite Membrane Separation Method Applicable to Sewage Desalination and Reuse

Abstract

Disclosed is a composite membrane separation method applicable to desalting and recycling of sewage. The method achieves desalting of the sewage through a filtering and adsorbing effect of a conductive composite membrane reactor. The conductive composite membrane reactor consists of a water inlet system (1), a power source system (2), a membrane reactor (3), a water outlet control system (4) and a clean water tank (5). The membrane reactor (3) consists of a reaction tank, a composite membrane module (6) and a stirring system. The composite membrane module (6) has a flat sheet membrane configuration and consists of a cathode composite membrane (8), an anode composite membrane (9) and a separation layer (10), wherein the cathode composite membrane (8) is formed by adhering, using a polymeric material, a cathode electrode (12) with a cathode current collector (11) and the anode composite membrane (9) is formed by adhering, using a polymeric material, an anode electrode (13) with an anode current collector (14). The cathode composite membrane (8) and the anode composite membrane (9) are separated by the separation layer (10) to avoid a short circuit. The cathode current collector (11) is disposed on the same side as a water inlet, the anode current collector (14) is disposed on the same side as a water outlet. Influent water first flows through the cathode current collector (11) and the cathode electrode (12), then the separation layer (10), and then the anode electrode (13) and the anode current collector (14), and is discharged from the conductive composite membrane reactor in the form of membrane effluent water.

Description

technical field [0001] The invention relates to a composite membrane separation method suitable for sewage desalination and reuse, which uses the coupling principle of membrane filtration and electric adsorption to remove ions in sewage and improve the quality of effluent, belonging to the field of sewage (waste) water treatment. Background technique [0002] With the rapid development of social economy, the environmental situation is becoming more and more severe. Among many environmental problems, the shortage of water resources is becoming more and more serious, which has become a major bottleneck restricting the sustainable development of social economy. Under such circumstances, simply advocating water conservation is not enough to meet the current water demand. It is urgent to develop and utilize unconventional water sources, such as desalination of brackish water, recycling of industrial wastewater, and advanced treatment and reuse of municipal wastewater. Groundwater...

AI Technical Summary

Problems solved by technology

However, the existing research results and literature reports mainly focus on the optimization of the electro-adsorption process, and the results related to desalination in the domestic patents are also concentrated on the operating conditions of membrane separation and electro-adsorption alone, such as Takafumi Kiuchi (membrane separation device and Membrane separation method invention patent publication number 103052437), Chang Zheng (a kind of selective removal of Fe from industrial wastewater by electro-adsorption technology 2+ and / or Fe 3+ method (invention patent publication number 104609518), but there are few reports on the coupling process of membrane separation and electrosorption

One of the few processes that combines the two, such as Zhang Hongtao (a membrane-electroadsorption device for desalination system invention patent publication number 103693718) uses ion-exchange membranes combined with electro-adsorption processes to desalinate wastewater, which adds cation exchange membranes and The purpose of the anion-exchange membrane is to increase the selective permeability of cations and anions respectively, and the ion-exchange membrane cannot filter sewage; secondly, the system still cannot solve the damage of particle pollutants to the device itself, and the cost of the ion-exchange membrane is high, and the operation Maintenance is more troublesome

Images