Studies On The New Biological Denitrification Technology By Adsorption Of Immobile Organisms For Wastewater Treatment In West Lake In Response To Diversion Works

Hang Zhou West Lake is a typical of the shallow lake of eutrophication. In order to improve the water quality in West Lake, our government has taken many actions, one of which is the water diversion project The second large-scale diversion project in 2003.Comparing the diversion project of Qian Tang River in 2003 with that in 1986, there are two big improvements.1:the diversion of water increased significantly,2: Before introducing the Qian Tang River water into the lake, the water must be treated by two settling tanks, through the treatment of which the transparency is dramatically increased and total phosphorus content drop. This topic is a method that the effluent of Mount Yu Huang is used as the inflow of the aerobic denitrification reactor before the diversion into the lake of the Qian Tang River, which makes water contain high nitrogen and low carbon in comparison of the quality of the surface runoff water.The main device used in the topic for testing is the aerobic denitrification reactor. Aerobic denitrification reactor is made by organic glass materials and it's cylindrical in shape. Filler is hung by combination. Cultivating aerobic denitrification bacteria to form a membrane, and then fix the infill to the reactor.Three sets of the device work at the same time. The infill of the first aerobic denitrification reactor is natural fiber LS, to which biological membrane directly attached. The infill of the second set of aerobic denitrification reactor is natural fiber LS improved by alginate and biological membrane attach to sodium alginate. The infill of the third set of aerobic denitrification reactor is natural fiber LS improved by AGAR and biological membrane attached to AGAR. Through the comparison of the water quality of the same hydraulic retention time, natural fibers filler LS can be used as carbon sources of aerobic biochemical denitrifying bacteria.Changing the hydraulic retention time constantly during the test. When the hydraulic retention time is 6h, aerobic denitrification reactors of total nitrogen removal reached more than 90%.When hydraulic retention time is 4h, aerobic denitrification reactors of total nitrogen removal reached more than 75%. When hydraulic retention time is 2h, aerobic denitrification reactors of total nitrogen removal reached more than 40%. This topic achieves good effect of nitrogen removal using aerobic denitrifying bacteria to deal with high nitrogen treatment and low carbon water.