Double-membrane double-circulation sewage treatment process for enhancing denitrifying phosphorus removal

Abstract

The invention relates to a double-membrane double-circulation sewage treatment process for enhancing denitrifying phosphorus removal. An anaerobic/anoxia membrane bioreactor and an aerobic membrane bioreactor are connected in series so as to enhance denitrifying phosphorus removal through a double-membrane filtration two-way circulation mode. The double-membrane double-circulation sewage treatment process comprises the steps of: firstly, carrying out anaerobic phosphorus release on phosphorus-accumulating bacteria under anaerobic condition, and storing organic matters in inflowing water as poly-beta-hydroxybutyric acid; then circulating supernate subjected to anaerobic phosphorus release to the aerobic membrane bioreactor for carrying out aerobic nitrification and degrading organic matters through a membrane assembly, circulating nitrifying liquid in the aerobic membrane bioreactor to the anaerobic/anoxia membrane bioreactor for carrying out denitrifying phosphorus removal through the membrane assembly; then filtering effluent water by utilizing the membrane assembly, and finally discharging phosphorous-rich sludge, thus realizing the phosphorous removal. According to the double-membrane double-circulation sewage treatment process, the thorough separation of nitrobacterium and phosphorous-accumulating bacteria can be realized, the carbon source competence of different microorganisms and sludge age conflict in the traditional denitrification and phosphorous removal processes can be solved, and the carbon sources and running cost can be saved; the membrane filtration can meet the requirement on the quality of sewage recycled water; the process is simple in flow and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a double-membrane double-circulation water treatment process that strengthens the denitrification and phosphorus removal of low-carbon source urban sewage. Background technique [0002] Eutrophication of water body has been widely concerned because of its serious environmental hazards. Eutrophication of water body will affect the normal reoxygenation level of the atmosphere, reduce the concentration of dissolved oxygen in the water body, and cause a large number of deaths of aquatic animals and fish. The artificial discharge of industrial wastewater and domestic sewage containing nutrients (nitrogen, phosphorus) is an important factor causing eutrophication of water bodies. Improving the denitrification and phosphorus removal efficiency of sewage treatment plants is one of the effective measures to prevent the occurrence of eutrophication in water bodies. In order t...

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Problems solved by technology

However, the dual-sludge system has to go through multiple sedimentation and multi-stage reflux. The dual-sludge system has many shortcomings such as complex

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