Treatment system for high-salinity and high-COD industrial wastewater

Abstract

The invention provides a treatment system for high-salinity and high-COD industrial wastewater, and relates to the field of industrial wastewater treatment. The treatment system comprises the steps that industrial wastewater sequentially passes through a primary sedimentation tank, a hydrolytic acidification tank, an anaerobic tank, an aerobic tank, a secondary sedimentation tank, a sludge concentration digestion tank and a MVR system of the treatment system according to the flow direction of the wastewater so that COD-containing high-salinity water is treated by the treatment system, solid industrial superior-grade salt can be obtained and recycled, waste is turned into wealth and hazardous waste is eradicated; and the condensed water from the MVR system can be preliminarily recycled so that the high-salinity and high-COD industrial wastewater can be treated, and zero discharge of the wastewater is truly realized.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a treatment system for high-salinity and high-COD industrial wastewater. Background technique [0002] In high-salt and high-COD industrial wastewater, the content of inorganic salts is high, and the concentration of organic matter COD is high and contains toxic substances. Therefore, when industrial wastewater with high salt and high COD directly enters the conventional biochemical system, the high-concentration inorganic salts and toxic substances in the wastewater will be harmful to the environment. The microbial activity in the conventional biochemical system is highly inhibitory and destructive, and directly entering the MVR system will not only cause different degrees of blockage and efficiency reduction, but also affect the grade of the back-end industrial salt. To solve this problem, the engineering In practice, pretreatment technology is often used to make ...

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Problems solved by technology

[0002] In high-salt and high-COD industrial wastewater, the content of inorganic salts is high, and the concentration of organic matter COD is high and contains toxic substances. Therefore, when industrial wastewater with high salt and high COD directly enters the conventional biochemical system, the high-concentration inorganic salts and toxic substances in the wastewater will be harmful to the environment. The microbial activity in the conventional biochemical system is highly inhibitory and destructive, and directly entering the MVR system will not only cause different degrees of blockage and efficiency reduction, but also affect the grade of the back-end industrial salt. To solve this problem, the engineering In practice, pretreatment technology is often used to make up for this defect. The pretreatment technologies for high-salt and high-COD industrial wastewater currently used mainly include Fenton oxidation, electrochemical oxidation, wet catalytic oxidation, ozone oxidation, and photochemical oxidation. Oxidation methods, etc., mostly have defects such as harsh operation control conditions, expensive equipment, and complicated process technology. Among them, the Fenton oxidation method requires a large amount of chemicals and produces a large amount of sludge, and the electrochemical oxidation method, ozone oxidation method, and photochemical oxidation method Oxidation methods have disadvantages such as low oxidation efficiency, large equipment footprint, and single oxidation conditions. The wet catalytic oxidation method needs to be operated under high temperature and high pressure conditions, which consumes a lot of energy and is highly dangerous. Therefore, it is necessary to address the above shortcomings and defects. From the perspective of the entire process flow, design and develop a set of energy-saving, high-efficiency, and rapid start-up high-salt and high-COD industrial wastewater treatment systems and processes to meet the standards or reuse treatment of existing and upcoming high-salt and high-COD industrial wastewater, so as to Meet the needs of production, life and environmental protection

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