Method and system for treating high-concentration wastewater with high chlorine salt, high ammonia nitrogen and high organic matters

Abstract

The invention discloses a method and a system for treating high-concentration wastewater with high chlorine salt, high ammonia nitrogen and high organic matters. Chlorine ions and hydrogen ions are removed from the high-concentration wastewater through a chloride ion efficient electrolysis system, the chloride ions with relatively high corrosivity are removed, meanwhile, the high-concentration wastewater becomes strongly alkaline, ammonia nitrogen in the high-concentration wastewater overflows in a large amount in the form of ammonia gas, and ammonia gas is recovered. High-concentration watercan form a thin high-efficiency liquid film evaporation layer on a reactor of a drum liquid film evaporation system, evaporated water enters a two-stage condensation system, and condensed water entersa conventional EGSB for a degradation treatment. A salt and carbon mixture generated by solid high-temperature pyrolysis in the drum liquid film evaporation system is dissolved in water and filteredso as to separate salt from carbon, salt in water is recycled through re-crystallization, and near-zero emission is achieved. The harmless treatment of high-concentration wastewater is realized, meanwhile the high-concentration wastewater is converted into resources, difficulty is reduced for subsequent conventional sewage treatment systems, and stability of subsequent processes is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a treatment method and system for high-concentration wastewater with high chloride salt, high ammonia nitrogen and high organic matter. Background technique [0002] At present, more than 90% of productive enterprises are facing the problem of high salt content, high ammonia nitrogen, and high concentration organic wastewater, especially the chemical industry, which produces an average of 20 tons of high concentration wastewater every day. According to statistics from the National Bureau of Statistics, in 2018, my country's total wastewater discharge was 70.88 billion tons, of which high-concentration wastewater accounted for 6 million tons. This type of wastewater comes from the complex situation of production process wastewater, workshop cleaning wastewater, reactor flushing wastewater, and a variety of acid-base residual liquid mixtures. This k...

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Problems solved by technology

3) Disposal of organic matter in high-concentration water, direct landfilling of this part of organic matter will not only pollute the environment, but also waste energy

4) High ammonia nitrogen treatment in high-concentration wastewater: high ammonia nitrogen components will bring great difficulties to subsequent biochemical treatment

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