SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (6): 1027-1034.DOI: 10.1016/j.cjche.2014.11.013

• 能源、资源与环境技术 • 上一篇    下一篇

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. 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
  • 收稿日期:2014-06-21 修回日期:2014-10-14 出版日期:2015-06-28 发布日期:2015-07-09
  • 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).

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. 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:2015-06-28 Published:2015-07-09
  • 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).

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

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