Double-membrane wastewater biological treatment system

Abstract

The invention discloses a double-membrane wastewater biological treatment system. The double-membrane wastewater biological treatment system comprises a pool (case) body, a pretreatment zone, a biomembrane reaction zone and a membrane separation reaction zone; and all the above zones are separated through a wall or a separator to form respectively independent work systems, relevant zones are communicated through water flowing ports, a high pressure fan, a membrane water outlet pump and an ultraviolet ray disinfection instrument are arranged outside the pool (case) body, and water discharged from a membrane assembly is pumped into the ultraviolet ray disinfection instrument through the membrane water outlet pump, is disinfected and is discharged outside. The wastewater biological treatment system has the advantages of simple technological structure, good treatment effect, stable running and wide application range, is suitable for the low-concentration organic sewage treatment in hospitals, health centers, rural, the country and towns, and is also suitable for the high-concentration organic wastewater treatment in the industries of bave wastewater, slaughtering wastewater, food processing and the like, so treated water reaches recycled water reuse standards, accords with Chinese energy saving, emission reduction and circular economy policies, and the system can well play an important role in the public campaigns of Wild China, Urban and Rural Cleaning at present, and has large social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a double-membrane wastewater biological treatment system composed of a pretreatment area-biofilm reaction area-membrane separation reaction area-ultraviolet sterilizer. Background technique [0002] The well-known membrane bioreactor wastewater treatment technology, referred to as "MBR" technology in English, is an advanced technology widely used in organic wastewater treatment introduced from abroad in recent years. This membrane bioreactor generally uses activated sludge + hollow fiber membrane Combination, that is, the single-membrane biological reaction process, due to the simple process flow, good treatment effect, strong sewage interception ability, and high-quality effluent water, it has been well promoted and developed in China. Wastewater is in the same working unit and mixed with sewage sludge. As the membrane separation process proceeds, the microorganisms, poll...

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Problems solved by technology

This patent replaces the activated sludge method with the method of immobilizing microorganisms, that is, biofilm technology, so that the defects and shortcomings of the above-mentioned processes are well resolved. The patented process device is mainly composed of a box, a biofilm filter layer, a membrane module, an outlet pump, The biofilm filter layer is composed of various porous filter materials such as zeolite, ceramsite, coke, activated carbon, etc., and then cultivated by biotechnology to form a biofilm, through the physical pollution interception and biosorption of the biofilm filter layer Dissolving, the effluent is discharged or reused after being sterilized by an ultraviolet sterilizer. In the above-mentioned patent invention of the inventor, although the method of immobilizing microorganisms is used to replace the conventional activated sludge method, the treatment efficiency and the service life of the membrane are improved to a certain extent. and improvement, but in the above-mentioned patented technology of the present inventor, the biomembrane filter layer and the membrane module are still in the same working environment, and the biological reaction and the membrane separation reaction cannot be effectively separated. Impurities such as organic matter can still enter the membrane module to participate in the reaction process of the membrane. On the other hand, the pollutants intercepted by the membrane module continue to accumulate, and the water quality continues to deteriorate, which will eventually affect the safety and stability of the membrane operation. In the treatment of low-concentration sewage such as water source, domestic sewage and hospital sewage, the adverse effect on the membrane module is small, and the membrane module can still work normally within the set use range and period, but for slaughter wastewater, Food processing wastewater, cocoon silk wastewater and other organic wastewater treatment with higher concentration and more complex water quality will have more serious adverse effects on membrane operation. Therefore, the above patented technology still has certain limitations and limitations in the application of wastewater treatment. Inadequacies

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