Conversion of full nitritation to partial nitritation/anammox in a continuous granular reactor for low-strength ammonium wastewater treatment at 20 °C
- 15 January 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Biodegradation
- Vol. 32 (1), 87-98
- https://doi.org/10.1007/s10532-020-09923-w
Abstract
The feasibility of converting full nitritation to partial nitritation/anammox (PN/A) at ambient temperature (20 °C) was investigated in a continuous granular reactor. The process was conducted without anammox bacteria inoculation for the treatment of 70 mg L−1 of low-strength ammonium nitrogen wastewater. Following the stepwise increase of the nitrogen loading rate from 0.84 to 1.30 kg N m−3 d−1 in 320 days of operation, the removal efficiency of total inorganic nitrogen (TIN) exceeded 80% under oxygen-limiting conditions. The mature PN/A granules, which had a compact structure and abundant biomass, exhibited a specific TIN removal rate of 0.11 g N g−1 VSS d−1 and a settling velocity of 70.2 m h−1. This was comparable with that obtained at above 30 °C in previous reports. High-throughput pyrosequencing results revealed that the co-enrichment of aerobic and anaerobic ammonium-oxidizing bacteria identified as genera Nitrosomonas and Candidatus Kuenenia, which prompted a hybrid competition for oxygen and nitrite with nitrite-oxidizing bacteria (NOB). However, the overgrowth of novel NOB Candidatus Nitrotoga adapted to low temperatures and low nitrite concentration could potentially deteriorate the one-stage PN/A process by exhausting residual bulk ammonium under long-term excessive aeration.Keywords
Funding Information
- National Natural Science Foundation of China (41807142, 51878430)
- Open Project of National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology (No.2019KF02)
- Jiangsu graduate research and practice innovation program, China (SJCX20_1101)
- Qinglan Project for Jiangsu Colleges and Universities, China
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