TY - JOUR
T1 - Efficient Treatment and Simultaneous Energy Recovery from Cattle Wastewater by the Micro-Aerated UASB and SBR Coupled System
AU - Xu, Linji
AU - Huang, Jiansheng
AU - Li, Lin
AU - Zhuang, Huichuan
AU - Guo, Yinying
AU - Zhang, Ruihao
AU - Leu, Shao Yuan
AU - He, Qiang
N1 - Funding Information:
The authors would like to acknowledge the National Natural Science Foundation of China (U20A20326), Environment and Conservation Fund ECF (102/2021), Technology Innovation and Application Demonstration Special Key R & D project of Chongqing (cstc2018jszx-zdyfxmX0001), Scientific Research Project of Chongqing Ecology Environment Bureau (No. 2019-91), and Provincial and Ministerial Co-constructive of Collaborative Innovation Center for MSW Comprehensive Utilization (shljzyh2021-09) for the financial support. The authors would like to thank the anonymous referees for their constructive comments regarding this manuscript.
Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023
Y1 - 2023
N2 - The present study introduces a coupled system comprising an upflow anaerobic sludge blanket (UASB) and a sequencing batch reactor (SBR) to treat intensive cattle farming wastewater. The results confirmed that the optimal conditions for UASB were an organic load rate of 9.98 kg-COD m-3·day-1, a C/N ratio of 22, and a hydraulic retention time (HRT) of 1.5 h. For the SBR reactor, the optimal conditions are a dissolved oxygen (DO) concentration of 6.08 mg L-1 and the S2 aeration mode. Under these optimal conditions, the study achieved anaerobic and aerobic sludge granules (0.25-0.5 and 0.5-0.75 mm) with excellent properties due to the cooperation of a functional microbial community, including Synergistetes, Thermotogae, Acidobacteria, Proteobacteria, Chloroflexi, and Hyd24-12 in UASB and Paracoccus, Proteobacteria, Chloroflexi, and Acinetobacter in SBR. This hybrid system contributed 94% of chemical oxygen demand (COD), 90% of NH4+-N, 90% of TN, and 61% of TP. Additionally, it achieved 18% net energy recovery from the real cattle wastewater, indicating that the UASB-SBR-coupled system holds potential as an approach for treating and recovering energy from cattle wastewater.
AB - The present study introduces a coupled system comprising an upflow anaerobic sludge blanket (UASB) and a sequencing batch reactor (SBR) to treat intensive cattle farming wastewater. The results confirmed that the optimal conditions for UASB were an organic load rate of 9.98 kg-COD m-3·day-1, a C/N ratio of 22, and a hydraulic retention time (HRT) of 1.5 h. For the SBR reactor, the optimal conditions are a dissolved oxygen (DO) concentration of 6.08 mg L-1 and the S2 aeration mode. Under these optimal conditions, the study achieved anaerobic and aerobic sludge granules (0.25-0.5 and 0.5-0.75 mm) with excellent properties due to the cooperation of a functional microbial community, including Synergistetes, Thermotogae, Acidobacteria, Proteobacteria, Chloroflexi, and Hyd24-12 in UASB and Paracoccus, Proteobacteria, Chloroflexi, and Acinetobacter in SBR. This hybrid system contributed 94% of chemical oxygen demand (COD), 90% of NH4+-N, 90% of TN, and 61% of TP. Additionally, it achieved 18% net energy recovery from the real cattle wastewater, indicating that the UASB-SBR-coupled system holds potential as an approach for treating and recovering energy from cattle wastewater.
KW - anaerobic/aerobic activated sludge granulation
KW - cattle wastewater
KW - energy balance
KW - microbial community
KW - UASB−SBR-coupled system
UR - http://www.scopus.com/inward/record.url?scp=85169051461&partnerID=8YFLogxK
U2 - 10.1021/acsestwater.3c00241
DO - 10.1021/acsestwater.3c00241
M3 - Journal article
AN - SCOPUS:85169051461
SN - 2690-0637
JO - ACS ES and T Water
JF - ACS ES and T Water
ER -