Study On The New Aerated Biofilter For Municipal Wastewater Treatment

Shortage of water resource is an important restricting-factor of the economy and society development in China, and a great deal of municipal sewage directly draining into water body without any treatment or with little treatment is a main cause why the quality of water environment has been deteriorating as a whole. So it is urgent to research and develop simple . high-efficient . low-consumptive treatment techniques for municipal sewage correspond to the situation of China. Landscape orientation aerated biofilter is one of the important technical approaches to resolve the problem. The study focuses on municipal sewage treatment using a landscape orientation aerated biofilter in which enzyme-promoted media is used. It includes start-up of the filter under condition of natural temperature, and performance of the filter treating municipal sewage under condition of natural temperature, and the effects of the parameters correlated to the filter.We do the experiment at school from Augest to December.The inflow COD% SS, pH is 200~500mg/l , 90~170mg/l and 7.3~8.2mg/l.The experiment have five periods .We do it in different HRT,COD and SS removal efficiency is above 80% and 90%, thereafter, the device was been done some progress.And moved to wastewater factory from April to December.The inflow COD, SS, pH is 189~553mg/K 100-149mg/l and 7.4-7.8mg/l.The experiment also have five periods and have same flux behind the front experiment .HRT is 4.8, 6.3, 7.7, 8.9 and 11.1 hours.Under less HRT(4.8h and 6.3h),the COD and SS removal efficiency also is above 80% and 90%. From this experiment we can draw a conclution the basic parameter is we should keep the mount of oxygen is less 0.15mg/l in anaerobic area and more 2mg/l in aerobic area.HRT is not less 4.8 hours.The results demonstrate: It takes about two weeks to complete the start-up under the normal condition with the nitrified sludge as seed. When the COD in influent varies between 200~500mg/l, and HRT is above 7.0h, and organic volume loading rate of media layer is below 4.954KgCOD/(m3 d), the COD removal efficiency can stabilize above 70% under the condition of 11.0~25.0C, and the SS in effluent is below 1 Omg/1. Besides, N, P in influent can be remove to some degree.The result of research is active guide effect to middle of small wastewater factory.