Combined desalination wastewater treatment system for synchronous recovery of salt differential energy and chemical energy in wastewater

Abstract

The invention discloses a combined desalination wastewater treatment system for synchronous recovery of salt differential energy and chemical energy in wastewater. The system is composed of a microbial reverse electrodialysis tank and an electrodialysis tank. The system is characterized in that the microbial reverse electrodialysis tank is used for recycling the salt differential energy between high concentration salt wastewater and low concentration salt fresh water and the chemical energy of organic matter in the high concentration salt wastewater, and electric energy is generated; the electrodialysis tank is used for desalting the high concentration salt wastewater by using the electric energy generated by the microbial reverse electrodialysis tank; the microbial reverse electrodialysistank includes an anode chamber and a cathode chamber which are separated by a membrane assembly. An anode carbon brush is arranged in the anode chamber, and electricity producing microorganisms are attached onto the surface of the anode carbon brush; an air cathode is arranged in the cathode chamber. The membrane assembly includes an anion exchange membrane, a cation exchange membrane, a high concentration salt wastewater flow channel and a low concentration salt fresh water flow channel. The system can be further widely used in the fields of energy, chemical industry, environmental protection and the like.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a combined desalination waste water treatment system for synchronous recovery of salinity difference energy and sewage chemical energy. Background technique [0002] In recent years, the pickled mustard industry has developed rapidly, and sales have increased sharply. However, during the production process, a large amount of wastewater with high salt and high concentration of organic matter will be discharged. According to statistics, only about 5 million tons of pickled mustard wastewater is produced in the Three Gorges reservoir area every year, and its discharge shows a trend of increasing year by year. If these wastewater flows into the Three Gorges reservoir area without treatment, its high salinity and organic content (chemical oxygen demand, COD value 3000-20000mg / L) will easily cause serious impact on the ecological environment of the reservoir area. [0003] At pre...

AI Technical Summary

Problems solved by technology

According to field investigations, the salt concentration in mustard pickling wastewater is as high as 200g / L. In order to avoid dehydration and death of anaerobic fermentation microorganisms in a high-salt environment, and to ensure that the wastewater can meet the national discharge standard of salinity <20g / L, the traditional method uses Tap water directly dilutes pickled mustard wastewater, resulting in a serious waste of water resources

Moreover, it is difficult to collect the products after anaerobic fermentation, so that a large amount of chemical energy contained in the organic matter in the wastewater is wasted

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