Abstract: A pilot-scale, pre-anoxic-anaerobic oxidation ditch (OD) was used in this study to treat municipal wastewater with limited carbon source. A novel return activated sludge (RAS) pre-concentration tank was adopted for promoting the phosphorus removal efficiency and the effects of different RAS pre-concentration ratios were also studied. Under the optimal operational condition, the STP and the TP removal efficiencies were around 58.9% and 63.9% respectively and the effluent PO43--P was lower than 0.8mg/L. The reasons are that: with the optimal RAS pre-concentration ratio, nitrate could be completely removed with endogenous carbon source and the secondary phosphorus release could also be strictly restrained in the pre-anoxic tank. Therefore, the anaerobic phosphorus release and the carbon source uptake by PAOs in the sludge, extremely important to the phosphorus removal process, will be fully satisfied. Furthermore, ORP (Oxidation-Reduction Potential) was proved to be novel modified system was also beneficial for PAOs accumulation.
刘巍 杨殿海. Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal Improvement in a Novel Oxidation Ditch [J]. .
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