Efficient Treatment and Simultaneous Energy Recovery from Cattle Wastewater by the Micro-Aerated UASB and SBR Coupled System

Linji Xu, Jiansheng Huang, Lin Li, Huichuan Zhuang, Yinying Guo, Ruihao Zhang, Shao Yuan Leu, Qiang He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

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.

Original languageEnglish
JournalACS ES and T Water
DOIs
Publication statusAccepted/In press - 2023

Keywords

  • anaerobic/aerobic activated sludge granulation
  • cattle wastewater
  • energy balance
  • microbial community
  • UASB−SBR-coupled system

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Water Science and Technology

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