Influence of carbon sources on nutrient removal in A²/O-MBRs: Availability assessment of internal carbon source

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• 作者：Rongle Xu¹ ; ² ; ^{lele870709@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yaobo Fan² ; ^{ybfan@rcees.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yuansong Wei² ; Yawei Wang² ; Nan Luo² ; Min Yang² ; Xing Yuan² ; Rong Yu¹
• 关键词：Carbon source ; Nutrient removal ; Mass balance ; Cost analysis
• 刊名：Journal of Environmental Sciences
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：48
• 期：Complete
• 页码：59-68
• 全文大小：637 K

文摘

Both internal carbon source and some external carbon sources were used to improve the nutrient removal in Anaerobic-Anoxic-Oxic-Membrane Bioreactor (A²/O-MBRs), and their technical and cost analysis was investigated. The experimental results showed that the nutrient removals were improved by all the carbon source additions. The total nitrogen and phosphorus removal efficiency were higher in the experiments with external carbon source additions than that with internal carbon source addition. It was found that pathways of nitrogen and phosphorus transform were different dependent on different carbon source additions by the mass balance analysis. With external carbon source addition, the simultaneous nitrification and denitrification occurred in aerobic zone, and the P-uptake in aerobic phase was evident. Therefore, with addition of C-MHP (internal carbon source produced from sludge pretreatment by microwave-H₂O₂ process), the denitrification and phosphorus-uptake in anoxic zone was notable. Cost analysis showed that the unit nitrogen removal costs were 57.13 CNY/kg N of C-acetate addition and 54.48 CNY/kgN of C-MHP addition, respectively. The results indicated that the C-MHP has a good technical and economic feasibility to substitute external carbon sources partially for nutrient removal.