Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

Chin.J.Chem.Eng. ›› 2012, Vol. 20 ›› Issue (4): 747-753.

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles Next Articles

Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

LIU Wei¹, YANG Dianhai¹, XU Li¹, JIA Chuan¹, LU Wenjian¹, BOSIRE Omosa Isaiah², SHEN Changming¹

1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Sciences and Engineering, Tongji University, Shanghai 200092, China;
2. UNEP-TONGJI Institute of Environment for Sustainable Development, College of Environmental Sciences and Engineering, Tongji University, 200092 Shanghai, China

Received:2011-03-08 Revised:2011-09-15 Online:2012-09-15 Published:2012-08-28
Supported by:
Supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2008ZX07316)

Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

刘巍¹, 杨殿海¹, 徐立¹, 贾川¹, 卢文建¹, BOSIRE Omosa Isaiah², 沈昌明¹

1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Sciences and Engineering, Tongji University, Shanghai 200092, China;
2. UNEP-TONGJI Institute of Environment for Sustainable Development, College of Environmental Sciences and Engineering, Tongji University, 200092 Shanghai, China

通讯作者: YANG Dianhai, E-mail:yangdianhai@tongji.edu.cn
基金资助:
Supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2008ZX07316)

Abstract

Abstract: A pilot-scale,pre-anoxic-anaerobic oxidation ditch 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 improving the phosphorus removal efficiency and the effects of RAS preconcentration ratio were studied.Under the optimal operational condition,the suspended total phosphorus(STP) and the total phosphorus(TP) removal efficiencies were around 58.9% and 63.9% respectively and the effluent PO₄^3--P was lower than 0.8 mg·L^-1.The reason is that with the optimal RAS pre-concentration ratio,nitrate is completely removed with endogenous carbon source and the secondary phosphorus release is strictly restrained in the pre-anoxic tank.Therefore,the anaerobic phosphorus release and the carbon source uptake by phosphorus accumulation organisms(PAOs) in the sludge,which are extremely important to the phosphorus removal process,can be fully satisfied.Furthermore,the oxidation-reduction potential is proved to be suitable for controlling the RAS pre-concentration ratio due to influent fluctuation and varied conditions.The novel modified system is also beneficial for PAO accumulation.

Key words: denitrifying phosphorus removal, nitrate, oxidation ditch, phosphorus, return activated sludge pre-concentration, secondary phosphorus release

摘要： A pilot-scale,pre-anoxic-anaerobic oxidation ditch 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 improving the phosphorus removal efficiency and the effects of RAS preconcentration ratio were studied.Under the optimal operational condition,the suspended total phosphorus(STP) and the total phosphorus(TP) removal efficiencies were around 58.9% and 63.9% respectively and the effluent PO₄^3--P was lower than 0.8 mg·L^-1.The reason is that with the optimal RAS pre-concentration ratio,nitrate is completely removed with endogenous carbon source and the secondary phosphorus release is strictly restrained in the pre-anoxic tank.Therefore,the anaerobic phosphorus release and the carbon source uptake by phosphorus accumulation organisms(PAOs) in the sludge,which are extremely important to the phosphorus removal process,can be fully satisfied.Furthermore,the oxidation-reduction potential is proved to be suitable for controlling the RAS pre-concentration ratio due to influent fluctuation and varied conditions.The novel modified system is also beneficial for PAO accumulation.

关键词: denitrifying phosphorus removal, nitrate, oxidation ditch, phosphorus, return activated sludge pre-concentration, secondary phosphorus release

LIU Wei, YANG Dianhai, XU Li, JIA Chuan, LU Wenjian, BOSIRE Omosa Isaiah, SHEN Changming. Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch[J]. Chin.J.Chem.Eng., 2012, 20(4): 747-753.

刘巍, 杨殿海, 徐立, 贾川, 卢文建, BOSIRE Omosa Isaiah, 沈昌明. Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch[J]. Chinese Journal of Chemical Engineering, 2012, 20(4): 747-753.

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Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

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