High-salt-content concentrated water zero-discharge treatment system and process method

Abstract

The problem that COD (chemical oxygen demand) and scaling ions in high-salt-content concentrated water form scales and block a subsequent membrane device is effectively solved by adopting the technology of combining electric flocculation and a tube micro-filtration membrane. The high-salt-content concentrated water is concentrated by adopting an electrodialysis process, so that the salt content in the concentrated water can be concentrated to 12-15 times, and the volume of the concentrated water can be reduced to 5-10% of the original volume. With the adoption of an MVR (Mechanical Vapor Recompression) evaporator, only a minute quantity of vapor is needed, the operating cost of enterprises is greatly reduced, and the environmental pollution is reduced. Waste hot steam emission is avoided, and the energy-saving effect is very obvious. Because a heat source is provided by a compressor, compared with the traditional evaporator, the MVR evaporator has small temperature difference and can achieve moderate evaporation, the product quality is greatly improved, and scale formation is reduced. Moreover, a condenser is not needed, and the system is extremely simple in structure and process flow, is operated in a full-automatic manner, can be continuously operated and is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a zero-discharge treatment system and process method for high-salt concentrated water. Background technique [0002] In recent years, with the rapid development of petrochemical, electric power, metallurgy, coal chemical industry and other industries, the amount of wastewater containing complex components produced in the process of industrial production has also increased year by year. The problem of how to dispose and utilize these wastewater containing complex components has been widely Pay attention to. Especially in areas where water resources are scarce, how to make good use of this part of wastewater and realize zero discharge of wastewater is of great importance to protect the surrounding environment and natural water bodies on which we live, to further improve the comprehensive utilization efficiency of water resources, and to alleviate the tension o...

AI Technical Summary

Problems solved by technology

[0004] At present, the treatment methods for high-salt concentrated water include: high-efficiency reverse osmosis, DTRO, ultra-frequency vibrating membrane, forward osmosis, membrane distillation, etc., but these process equipment have problems such as high investment and operation costs, fouling and scaling during operation, etc. Moreover, the overall system is limited, and the economic and technical aspects are not strong

Traditional COD degradation methods include biochemical and physical chemical methods. COD in high-salt concentrated water is mostly difficult to biodegrade COD, and biochemical methods are not suitable for treatment.

Physical and chemical methods include Fenton oxidation method and activated carbon adsorption method. These methods have high operating costs and generate more solid waste

Traditional methods for removing hardness include lime softening method and ion exchange method. Lime softening method is easy to cause scaling and blockage of pipeline equipment, and at the same time produces more solid waste. Ion exchange method regenerated wastewater is difficult to treat

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