Study On The OGO Process For Flow Pattern, Denitrification And Dephosphorization

OGO process has been developed based on the modification of OCO process through experimental research. As a innovatory technology, it has the charateristics of facilitation,effectiveness and economics with the functions of phosphorus removal and denitrification. OGO technology has already been approved as Utility Model Patent (ZL2005 2 0010545.7). According to the characteristics of OGO system, study on the effects of submerged propeller in different place on flow pattern and biological nitrogen and phosphorus removal effect is carried out in the paper.The main coentens of the paper are as the followings:(1) The flow pattern study of OGO system;(2) Mathematical Simulation of OGO system through FLUENT;(3) Research the effects of biological nitrogen and phosphorus removal in different submerged propeller station;(4) Research of the phenomenon of the denitrifying phosphorus uptake in OGO system.The research results shows that :the flow patterns of OGO system is mix in whole and plug flow in part, but for different submerged propeller station-- second station(A and B)and first station(only B)is different: the plug flow on second station is stronger than first station; the N on second station is big than first station; the dead zone on second station is small than first station. Set up the mathematical model through the FLUENT to get the flow pattern in different submerged propeller station. Comparing the measure date and simulation date, the result indicates that this simulation is feasible. Research the effects of biological nitrogen and phosphorus removal in different submerged propeller station. The average removal efficiencies of COD,TN,NH3-N,PO43--P,TP achieve 90.03%, 71.94%, 82.51%, 8.38% and 87.03% at first station. The effect of second station is better than first station. The average removal efficiencies of COD,TN,NH3-N,PO43--P,TP are 91.33%,76.12%,83.97%,83.47% and 89.21%. Combine with the flow pattern study, the second station is more reasonable than first station. Study the denitrifying phosphorus removal and affect factors at second station.The study contents belong to a part of Netherlands government grant projects (economic feasible processes and demonstrations for environmental infrastructures in western China's small towns) and the research are also supported by state's natural science foundation. This research acquired the values of important parameters that could be used in actual design and control as well as provide support for the engineering utilization of OGO in municipal wastewater treatment.