Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

doi:10.1016/j.cjche.2014.11.013

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (6): 1027-1034.DOI: 10.1016/j.cjche.2014.11.013

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

Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

Qin Lu¹, Haiyan Wu², Haoyan Li³, Dianhai Yang¹

1 State Key Lab. of Pollution Control and Resources Reuse, College of Environmental Sciences and Engineering, Tongji University, Shanghai 200092, China;
2 Xylem (China) Co., Ltd., Shanghai 200051, China;
3 Shanghai Plant Biomass Co., Ltd., Shanghai 200092, China

Received:2014-06-21 Revised:2014-10-14 Online:2015-07-09 Published:2015-06-28
Contact: Dianhai Yang
Supported by:
Supported by the Major Science and Technology Program forWater Pollution Control and Treatment-Crucial Technology Research and Engineering Sample Subject on Municipal Wastewater Treatment Process Updated to Higher Drainage Standard (2008ZX07317-02) belonging to Wuhan Water Pollution Control and the Water Environment Administer Technology and Synthetic Sample Project in Cities and Towns (2008ZX07317).

Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

Qin Lu¹, Haiyan Wu², Haoyan Li³, Dianhai Yang¹

1 State Key Lab. of Pollution Control and Resources Reuse, College of Environmental Sciences and Engineering, Tongji University, Shanghai 200092, China;
2 Xylem (China) Co., Ltd., Shanghai 200051, China;
3 Shanghai Plant Biomass Co., Ltd., Shanghai 200092, China

通讯作者: Dianhai Yang
基金资助:
Supported by the Major Science and Technology Program forWater Pollution Control and Treatment-Crucial Technology Research and Engineering Sample Subject on Municipal Wastewater Treatment Process Updated to Higher Drainage Standard (2008ZX07317-02) belonging to Wuhan Water Pollution Control and the Water Environment Administer Technology and Synthetic Sample Project in Cities and Towns (2008ZX07317).

Abstract

Abstract: A pilot-scale modified carbon source division anaerobic anoxic oxic (AAO) process with pre-concentration of returned activated sludge (RAS) was proposed in this study for the enhanced biological nutrient removal (BNR) of municipal wastewater with limited carbon source. The influent carbon source was fed in step while a novel RAS pre-concentration tank was adopted to improve BNR efficiency, and the effects of an influent carbon source distribution ratio and a RAS pre-concentration ratiowere investigated. The results showthat the removal efficiency of TN is mainly influenced by the carbon source distribution ratio while the TP removal relies on the RAS pre-concentration ratio. The optimum carbon source distribution ratio and RAS pre-concentration ratio are 60% and 50%, respectively, with an inner recycling ratio of 100% under the optimum steady operation of pilot test, reaching an average effluent TN concentration of 9.8 mg·L^-1 with a removal efficiency of 63% and an average TP removal efficiency of 94%. The mechanism of nutrient removal is discussed and the kinetics is analyzed. The results reveal that the optimal carbon source distribution ratio provides sufficient denitrifying carbon source to each anoxic phase, reducing nitrate accumulation while the RAS pre-concentration ratio improves the condition of anaerobic zone to ensure the phosphorus release due to less nitrate in the returned sludge. Therefore, nitrifying bacteria, denitrifying bacteria and phosphorus accumulation organisms play an important role under the optimum condition, enhancing the performance of nutrient removal in this test.

Key words: Modified AAO process, Carbon source distribution ratio, Returned activated sludge pre-concentration, Biological nutrient removal

摘要： A pilot-scale modified carbon source division anaerobic anoxic oxic (AAO) process with pre-concentration of returned activated sludge (RAS) was proposed in this study for the enhanced biological nutrient removal (BNR) of municipal wastewater with limited carbon source. The influent carbon source was fed in step while a novel RAS pre-concentration tank was adopted to improve BNR efficiency, and the effects of an influent carbon source distribution ratio and a RAS pre-concentration ratiowere investigated. The results showthat the removal efficiency of TN is mainly influenced by the carbon source distribution ratio while the TP removal relies on the RAS pre-concentration ratio. The optimum carbon source distribution ratio and RAS pre-concentration ratio are 60% and 50%, respectively, with an inner recycling ratio of 100% under the optimum steady operation of pilot test, reaching an average effluent TN concentration of 9.8 mg·L^-1 with a removal efficiency of 63% and an average TP removal efficiency of 94%. The mechanism of nutrient removal is discussed and the kinetics is analyzed. The results reveal that the optimal carbon source distribution ratio provides sufficient denitrifying carbon source to each anoxic phase, reducing nitrate accumulation while the RAS pre-concentration ratio improves the condition of anaerobic zone to ensure the phosphorus release due to less nitrate in the returned sludge. Therefore, nitrifying bacteria, denitrifying bacteria and phosphorus accumulation organisms play an important role under the optimum condition, enhancing the performance of nutrient removal in this test.

关键词: Modified AAO process, Carbon source distribution ratio, Returned activated sludge pre-concentration, Biological nutrient removal

Qin Lu, Haiyan Wu, Haoyan Li, Dianhai Yang. Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration[J]. Chin.J.Chem.Eng., 2015, 23(6): 1027-1034.

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Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

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