Sodium sulfate wastewater treatment device and recycling method

Abstract

The invention discloses a sodium sulfate wastewater resource utilization treatment process, which belongs to the field of industrial sewage treatment methods. Biological bacteria in a biochemical reaction unit in the method are efficient composite microbial bacteria, the sodium sulfate wastewater is subjected to biochemical treatment by fully utilizing the salt tolerance of the bacteria, most of organic matters are degraded, then an electrodialysis unit is added to the tail end of the biochemical unit, biochemical treatment effluent is subjected to concentration treatment, concentrated water is subjected to MVR evaporation treatment, and sodium sulfate is recycled. While organic matters in the sodium sulfate wastewater are degraded, sodium sulfate can be concentrated and recycled, so thatwaste is turned into wealth, and secondary utilization of the sodium sulfate wastewater is realized. The effluent quality is stable, the maintenance is convenient, and the method is suitable for industrial application.

Description

technical field [0001] The invention relates to a resource utilization treatment process of sodium sulfate wastewater, belonging to the technical field of industrial wastewater treatment. It specifically relates to the treatment of sodium sulfate wastewater and a method for recovering sodium sulfate in the wastewater. Background technique [0002] The chemical industry produces a large amount of sodium sulfate wastewater. The sodium sulfate content is about 60-180 g / L, the COD content reaches 50,000-100,000 mg / L, and the total nitrogen content is 50-100 mg / l (mainly inorganic ammonia). Due to the high salt content and high COD concentration in the wastewater, if it is directly discharged into the natural environment without purification treatment, it will cause water and soil pollution, damage the soil structure, and cause soil compaction, which is not conducive to the growth of animals and plants. pollute the environment. On the one hand, due to the high concentration of ...

AI Technical Summary

Problems solved by technology

Due to the high salt content and high COD concentration in the wastewater, if it is directly discharged into the natural environment without purification treatment, it will cause water and soil pollution, damage the soil structure, and cause soil compaction, which is not conducive to the growth of animals and plants. pollute the environment

On the one hand, due to the high concentration of COD in the wastewater, it contains a large amount of highly toxic and difficult-to-degrade organic matter, which is difficult to directly biodegrade. On the other hand, high-salt wastewater will affect the survival of bacteria in the biochemical system, so it cannot be completely treated directly by biological methods

[0003] At present, the domestic treatment of sodium sulfate wastewater is evaporative desalination process. The difficulty faced by this process is that it is difficult to achieve effective and stable operation of evaporative desalination devices with high concentration of COD and high concentration of salt.

The disadvantage is that there are many equipments, complex structures, cumbersome operations, and high operating costs. After evaporation, a large amount of mother liquor and crystallized salts become hazardous wastes, which require further disposal and high disposal costs.

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