Treating method of high-salt waste water

Abstract

The invention discloses a treating method of high-salt waste water. The treating method comprises the following steps that: (1) alkali liquor is added into the high-salt waste water, stirred uniformly and then keeps standing; and the solution after standing is filtered by an ultrafiltration membrane; (2) the solution after filtering is heated and then pumped into an organic-silicon membrane component by a pump, and after separation of the organic-silicon membrane component, concentrated water solution and pure-water solution are obtained;and (3) the concentrated water solution entering an evaporation device is primarily evaporated, evaporated steam flows back into the evaporation device by a condensing device to carry out secondary evaporation, and is condensed after secondary evaporation to obtain waste water reaching the emission standard. The treating method disclosed by the invention has the advantages that the alkali liquor is added for pretreatment, the organic-silicon membrane is adopted for concentration, one part of waste water can be discharged directly, and another part of waste water is secondarily evaporated and then discharged, so that the energy is saved, the treating effect is good and the treating method is suitable for treating the high-salt waste water in the industries of petroleum chemistry, pharmacy and food.

Description

technical field [0001] The invention relates to a treatment method for high-salt wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] Saline wastewater includes saline domestic sewage, saline industrial wastewater and other saline wastewater. Hypersaline wastewater is wastewater containing organic matter and at least 3.5% (by mass) total dissolved solids (TDS). High-salt wastewater comes from a wide range of sources, one is from chemical, pharmaceutical, petroleum, printing and dyeing, papermaking, dairy product processing, food canning and other industrial production processes; the other is the direct use of high-salt water such as seawater, such as seawater for circulating cooling, Fire etc. [0003] The types and chemical properties of organic matter in high-salt organic wastewater vary greatly depending on the production process, but most of the salts contained are Cl - , SO 4 2- 、Na + , Ca 2+ and other salts. ...

AI Technical Summary

Problems solved by technology

Due to the high osmotic pressure in high-salt wastewater, it is easy to cause dehydration of microbial cells and separation of cell protoplasm, plus the salting-out effect and the poisonous effect of chloride ions on bacteria. When the salt concentration is high, the density of wastewater increases, and the activated sludge is easy to The floating loss seriously affects the purification effect of the biological treatment system. Although with the progress and development of biochemical technology, the successful isolation, cultivation and domestication of salt-tolerant halophilic bacteria have further developed the treatment of high-salt wastewater, due to the production practice The environment is complex and changeable and difficult to control. Some strains need to be used in actual production, and there are still many problems to be solved. Therefore, the pure biological method can no longer meet the treatment needs of high-salt wastewater.

In addition, currently commonly used physical and chemical treatment methods for high-salt wastewater, such as electrolysis, incineration, evaporation, membrane distillation, and advanced oxidation, all have shortcomings such as high energy consumption, high cost, and secondary pollution to varying degrees.

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