Pilot Plant And Full-scale Research On Biological Phosphorus Removal Of A/O Process

With The growing phenomenon of eutrophication, reducing effluent phosphorus content become the main objective of wastewater treatment plant operation. Especially in the south of China, the stability of nitrogen and phosphorus removal of wastewater treatment plant was affected because of the lower concentration of municipal sewage.A/O pilot-plant process was analoged in XinZhiYuan wastewater treatment Co., Ltd Foshan Water Group.The A/O process's operation parameters and its'influencing factors was studied combined with the practical operation of Foshan Zhen'an wastewater treatment plant.The grit chamber effluent of the first period Zhen'an wastewater treatment plant was used by pilot plant water, achieving good phosphorus removal by adjusting the operation of the system parameters. The results showed that the effect of sludge concentration on the impact of phosphorus removal is significant. In the three sludge concentration (1500mg / L, 2500mg / L, 3500mg / L) case, the TP removal rates were 5.74%,66.30%,55.56%; Sludge Loading did not show a strict positive and negative ratio with TP removal, the result of phosphorus removal is better when the sludge loading's range is 0.5 ~ 0.6 kgCOD / (kgMLSS·d), the effluent TP concentration remained below 1mg / L; The sludge volume index (SVI) value in 60mL/g fluctuations around, sludge have good settling characteristics.Through the pilot plant and the actual wastewater treatment plant fed with different Hydraulic Retention Time(HRT) ratio of aerobic and anaerobic we conclude that the effect of phosphorus removal is more stable when is 1:1 than the HRT ratio are 1:3 and 2:3; in this three HRT ratios case, both effluent COD and ammonia nitrogen reached a municipal wastewater treatment plant emission standards Grade A standards(GB18918-2002). Better phosphorus removal was achieved when using two anaerobic distributary than one anaerobic distributary, phosphorus removal of wastewater treatment plant can be improved by multi-point distribution. Anaerobic phosphorus release and aerobic phosphorus uptake dynamics model were established and the substrate removal rate constant was derived by analyzing the A/O biological phosphorus removal process dynamics, which was validated by the datas of the First Period Zhen An Wastewater Treatment Plant.