56results about How to "Improve anaerobic environment" patented technology

The invention relates to a biological treatment method for removing nitrogen and phosphorus of sewage, and the biological treatment method comprises the processes of expansion hydrolysis, pre-denitrification reaction, aerobic reaction, sedimentation and separation, etc. A hydrolysis tank is utilized to replace a traditional tank during the expansion hydrolysis process, a pressure water distributor and a stirring device are further arranged, the biological treatment method does not only have good anaerobic environment and adequate retention time to ensure the phosphorus release, but can also more effectively convey phosphorus accumulating organisms after the full phosphorus release into the aerobic reaction to carry out the phosphorus absorption; suspended biological fillers are added during the aerobic reaction process for forming an aerobic biological fluidized bed, thereby fixing nitrifying bacteria and solving the sludge age contradiction for removing the nitrogen and the phosphorus; at the same time, the fillers form a plurality of micro-A / O nitrogen removal systems, thereby separating microbes with the different sludge ages and also maintaining the simple characteristic of the conventional A<2> / O technology; the biological treatment method does not use the chemical phosphorus removal method and only uses the biological treatment method for solving the contradiction for removing the nitrogen and the phosphorus in the traditional technology and simultaneously achieving the standards that TN is not more than 15mg / L and TP is not more than 0.5mg / L.