Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 302, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2021.114069
Keywords
Piggery wastewater; High ammonia; Anaerobic-aerobic process; Partial nitrification-anammox; Nitrogen removal
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Funding
- National Natural Science Founda-tion of China [51908163, 51778171]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201928]
- Heilongjiang Provin-cial Natural Science Foundation of China [LH2021E069]
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A biofilm-based anaerobic-aerobic (A(2)O(2)) reactor was constructed for treating manure-free piggery wastewater, achieving high-level nutrient removal with NH4+-N, TN, and COD removal efficiencies as high as 99.4%, 91.7%, and 79.4%, respectively. The results showed that COD and nitrogen removal occurred mainly in the anaerobic and aerobic phases, respectively.
A biofilm-based anaerobic-aerobic (A(2)O(2)) reactor was constructed to treat manure-free piggery wastewater. The reactor contained four compartments, among which the first two were anaerobic (A phase) and the last two were aerobic (O phase). Throughout around one-year operation, high-level nutrient removal was demonstrated. At an optimal reflux ratio of 100%, the average NH4+-N, TN, and COD removal efficiencies were high as 99.4%, 91.7%, and 79.4%, respectively, with the influent concentration of 220.6, 231.6 and 332 mg/L, respectively. The NH4+-N, TN, and COD concentrations in the final effluent were only 1.4, 18.5 and 65 mg/L, respectively. COD and nitrogen removal were mainly removed in the A phase and O phase, respectively. This result revolutionizes the previous perception that nitrogen is only removed in the A phase of conventional A-O configuration. Achievement of PN/A in the O phase was critical to the efficient nitrogen removal. Heterotrophic denitrification in the anaerobic compartments removed the nitrate produced by anammox, ensuring the high-level nitrogen removal. Anaerobic organic degradation was a major pathway for COD removal, as abundant methanogens detected in the A phase. This study provides a feasible technical scheme for the efficient nutrient removal from ammonium-rich wastewater.
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