Application Of SBR With Jet Aeration On Treatment Of Small-scale Town Sewage

As one important part of social development in China, lots of small towns have gained tremendous achievement during last decades. But more and more severe pollution brought during the development not only blocked the succeeding economic advance, but also threatened local environment. So it is necessary to sutdy the technology and equipment suiting the small town's sewage treatment in our country.After fully considering the characteristic of our country's small town sewage and widely used sewage treatment process and equipment, Sequencing Batch Reactors (SBR) equipped with Jet Aerator was elected to use in the piaot test. The whole test consisted of two parts: the parameters optimization test on Jet Aerator and the pilot-scale test of sewage treatment used SBR equipped with Jet Aerator.In the parameters optimization test on Jet Aerator, first put the Separate Structure Jet Aerator which was own designed and developed through Computational fluid dynamics (CFD) in the clean water test and gained under the third slenderness ratio. 1.6 kilogram jet pressure and the 7 meter water-depth, our jet aerator's inspiratory capacity was between 900 L/min and 1100L/min Then the running parameters of the Separate Structure Jet Aerator were obtained in the pilot-scale test reactor and general understand the Jet Aerator' running in the reactor.The sewage treatment test consisted of two parts: Aerobic SBR and Phosphorus and Nitrogen removal. The capability of organic contamination removal was studied in the aerobic SBR test, then the sedimentation and biologic characteristics were researched as well. Three cases were included in the Phosphorus and Nitrogen removal test. During each one, the results of phosphorus and nitrogen removal were studied under different aerobic reaction time and anoxic reaction time. The result of treatment was COD under secondary standard for discharge of pollutants (GB18918-2002), NH₄-N under primary standard for discharge of pollutants and TP between secondary and tertiary standard for discharge of pollutants. Final technique and economical analysis was made about the SBR equipped with Jet Aerator.In the finality, the problems requiring further studies are discussed.