Journal
BIORESOURCE TECHNOLOGY
Volume 259, Issue -, Pages 214-220Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.03.060
Keywords
Partial nitrification; Static magnetic field; Nitrite accumulation; Extracellular polymeric substance
Funding
- National Natural Science Foundation of China [51708263]
- Natural Science Foundation for Colleges of Jiangsu Province [15KJB610005]
- Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents
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Static magnetic field (SMF) with the intensity of 15 mT was applied during partial nitrification (PN) process to evaluate the impacts on nitrogen transformation and microbial characteristics. Results showed that the startup period of PN process at ambient temperature was markedly shortened by SMF, and the nitrite accumulation increased by 18% due to SMF exposure. The ammonia oxidizing bacteria (AOB) amoA gene copy numbers in the reactor with SMF exposure were 40% higher than that without SMF exposure, indicating the AOB abundance was enriched by SMF exposure. The characteristics of extracellular polymeric substances (EPS) changed accordingly. The extracellular protein increased by 30% due to SMF exposure, and it favored the aggregation of sludge flocs. The activated sludge with SMF exposure had a more compact structure, which was in favor of partial nitrification.
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