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| Comparative study on A/O and SBR processes for the treatment of digested effluent of swine wastewater |
| Received:August 09, 2021 |
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| KeyWord:swine wastewater;digested effluent;anoxic/oxic process;sequencing batch reactor;Stover-Kincannon model |
| Author Name | Affiliation | E-mail | | CAI Yingying | Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | | | HAN Zhigang | Fuzhou Gongchuang Environmental Technology Co., Ltd., Fuzhou 350000, China | | | DENG Liangwei | Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | dengliangwei@caas.cn | | WANG Wenguo | Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | |
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| Abstract: |
| The anoxic/oxic(A/O) process and sequencing batch reactor(SBR) process are popular aerobic biological processes for the treatment of digested effluent of swine wastewater. However,it is unclear which process has better performance. Therefore,laboratory-scale A/O and SBR processes were applied to compare their performance for the treatment of digested effluent of swine wastewater. The results showed that when the A/O and SBR processes were used to treat the digested effluent directly,the pH decreased to less than 6,thereby resulting in an average NH4+-N removal efficiency of less than 50%. However,the NH4+-N removal efficiency in the SBR process was slightly higher than that in the A/O process. After the digested effluent was supplemented with alkalinity,the NH4+-N removal efficiency in the two processes was improved to more than 99%. However,the improvement of the removal efficiencies of chemical oxygen demand (COD),total nitrogen(TN),and total phosphorus(TP) was not clear. There was no significant difference between the A/O and SBR processes in removing COD,NH4+-N,TN,and TP. Higher NH4+ oxidation and anammox activities were observed in the SBR process than in the A/O process,whereas the denitrification activity in the SBR process was much lower than that in the A/O process. The modified Stover- Kincannon model best fit the experimental data(R2>0.9). The maximum COD,TN,and NH4+-N utilization rates were 7.62,0.28,and 48.80 g·L-1·d-1 in the A/O process, and 7.18,0.13,and 65.4 g·L-1·d-1 in the SBR process,respectively. The results suggest that the SBR process is more favorable for NH + 4-N conversion,whereas the A/O process is more favorable for COD and TN removal. |
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