Persulfate Pretreatment-Vibrating Membrane Reactor Removal of Organic Matter in Membrane Concentrate

Abstract

The invention provides a process adopting persulfate pretreatment-vibrating membrane reactor to remove organic matter from membrane concentrated water. Target concentrated water subjected to advanced oxygenolysis with ultraviolet activated sodium persulfate enters a vibrating membrane reactor for completion of further degradation treatment of the organic matter. By means of sulfate radicals having strong oxidizing ability and produced by persulfate under an activated condition, refractory organic matter in the concentrated water is degraded into low-toxic non-toxic small-molecular substances such as organic acid, carbon dioxide, water and the like, the vibrating membrane reactor is used for further treating the pretreated organic matter after the biodegradability of the original organic matter in the concentrated water is improved, the vibrating membrane reactor replaces a traditional membrane reactor to achieve the purpose of membrane pollution reduction, so that concentration of the organic matter in the concentrated water is reduced, the membrane pollution degree in a follow-up membrane treatment process for salt separation and zero emission of the concentrated water is reduced, and wastewater is discharged up to the standard.

Description

technical field [0001] The invention relates to an industrial wastewater treatment technology, in particular to a persulfate pretreatment-vibrating membrane reactor process for removing organic matter in membrane concentrated water. Background technique [0002] With the advancement of sewage treatment technology, more and more wastewater is treated by membrane bioreactors. Membrane bioreactors can not only improve the removal efficiency of pollutants, but in many cases, the effluent can be directly reused as regenerated water. Therefore, membrane bioreactors The reactor process occupies a certain share in the treatment of urban sewage and industrial wastewater, but when the sewage is treated through the membrane, it usually produces about one-third of the concentrated water, which contains high concentrations of inorganic salts and organic substances, as well as some endocrine disruptors, Dissolved organic matter of drugs or pathogenic bacteria, the enrichment of these subs...

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Problems solved by technology

[0002] With the advancement of sewage treatment technology, more and more wastewater is treated by membrane bioreactors. Membrane bioreactors can not only improve the removal efficiency of pollutants, but in many cases, the effluent can be directly reused as regenerated water. Therefore, membrane bioreactors The reactor process occupies a certain share in the treatment of urban sewage and industrial wastewater, but when the sewage is treated through the membrane, it usually produces about one-third of the concentrated water, which contains high concentrations of inorganic salts and organic substances, as well as some endocrine disruptors, Dissolved organic matter of drugs or pathogenic bacteria, the enrichment of these substances in water will greatly affect the treatment and safe discharge of concentrated water, and usually the concentrated water is derived from the biochemical treatment process, both the composition of COD in the concentrated water and the refractory microbial degradation or Non-degradable organic matter is the main part, so simply using conventional biochemical methods to treat concentrated water will have problems of difficult degradation or high treatment costs

[0003] At present, the common processes for treating concentrated water in my country include: reflux method, reflux of concentrated water to improve recovery rate, but with the enrichment of various substances in concentrated water, the burden on the membrane will increase, the life of the membrane will be shortened, and the treatment cost will be increased; Used as water for production, when the concentrated water does not contain environmental priority pollutants, it can be used as cooling water, dust removal water, etc. after simple treatment; resource utilization, used for salt production in seawater desalination plants, and used for mariculture or Using power exchangers or pressure exchangers to make use of residual pressure to produce capacity; evaporation and concentration, using temperature differences to concentrate and crystallize concentrated water as much as possible under normal pressure, but this process has not yet been developed; advanced oxidative degradation, using activated free radical degradation treatment Refractory organic matter improves the biochemical properties of concentrated water, etc.

[0004] The application of membrane separation technology in sewage treatment has been paid more attention, and it is mainly used to replace the sludge mixture in the secondary sedimentation tank. However, although membrane separation technology has high energy conversion rate and purification of substances without changing its original physical and chemical properties, The separation process does not require dosing of chemicals, strong adaptability, convenient operation and maintenance, and easy to realize automatic control, but the investment cost of equipment is high, the membrane is easily polluted and the life of the membrane is short, and mechanical or chemical methods are required before membrane separation treatment. Method to remove impurities

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