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.