Zero-discharge treating system and zero-discharge treating method for industrial high-salinity wastewater with abundant refractory organics

Abstract

The invention discloses a zero-discharge treating system and a zero-discharge treating method for industrial high-salinity wastewater with abundant refractory organics. The zero-discharge treating system comprises a wastewater pond, a filtering pretreatment mechanism, an electrodialysis concentrating and separating mechanism, a desalination liquid pond, an advanced oxidation mechanism, a reverse osmosis membrane concentration mechanism and a nanofiltration membrane concentration mechanism which are communicated successively, the electrodialysis concentrating and separating mechanism is connected with a concentrated liquid pond, the concentrated liquid pond is communicated with a crystalizing and salt producing mechanism, and a water outlet end of the nanofiltration membrane concentration mechanism is connected to the filtering pretreatment mechanism and a concentrated liquid pond with the refractory organics. The zero-discharge treating method and a process route have the advantages that in a process of treating the industrial high-salinity wastewater with the abundant refractory organics, blockage problem of the organics can be alleviated, a chemical cleaning period can be prolonged, service lives of membranes can be prolonged, normal operation of a salt distribution and crystallization system is guaranteed, purities of sodium sulfate crystal salt and sodium chloride crystal salt are guaranteed, the amount of mother liquid discharge is decreased, operation cost of the integral zero-discharge treating system is reduced, and increasement of investment cost on the system is not significant.

Description

technical field [0001] The invention relates to the technical field of environmental protection water treatment, in particular to a zero-discharge treatment system and method for industrial high-salt wastewater rich in refractory organic matter. Background technique [0002] Among all concentration technologies, electrodialysis is currently the most mature and economical high-salt wastewater concentration technology, because it can concentrate soluble inorganic salts to a mass concentration of more than 20% at one time, which is close to the saturation solubility. It reduces the processing scale of the evaporation and crystallization unit with high energy consumption and high investment, and has been gradually applied by industrial enterprises such as electric power and coal chemical industry to projects of zero discharge of high-salt wastewater. However, when electrodialysis concentrates the inorganic salts to a mass concentration of 20%, the organic matter in the feed wate...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a zero-discharge treatment system and method for industrial high-salt wastewater rich in refractory organic matter. The method can not only solve organic film fouling, crystallization salt purity, reduce mother liquor discharge, etc. problems, and reduce the investment and operating costs of the entire high-salt wastewater reuse and zero discharge system

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