Journal
CHEMOSPHERE
Volume 261, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.127670
Keywords
Mainstream anammox; Partial nitrification; Hybrid system; Intermittent aeration; NOB suppress
Categories
Funding
- National Key Research and Development Program of China [2016YFC0401103]
- National Natural Science Foundation of China [51978007]
- Beijing Municipal Commission of Education
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Intermittent aeration is favorable for maintaining a long-term sewage partial nitrification-anammox (PN/ A) process but the underlying mechanism is not yet fully understood. In this study, mainstream PN/A was established in an integrated fixed film activated sludge (IFAS) PN/A reactor and nitrite oxidization bacteria (NOB) activity was continuously suppressed. The suppression of NOB was significantly affected by the dissolved oxygen (DO) concentration during the aeration period as well as the duration of anoxic period. NOB was more suppressed in the hybrid system under a low DO level (0.5 mg/L) than under a high DO level (1.5-1.8 mg/L). Meanwhile, shortening the anoxic time from 40 to 20 min and keeping low DO during the intermittent aeration cycle could still suppress NOB activity, increasing the nitrogen removal rate by 40%. Biomass segregation was also enhanced by low DO, which favors the NOB inhibition in IFAS PN/A system. Overall, under an optimized intermittent aeration, a stable and high nitrogen removal efficiency (80-89%) with a nitrogen removal rate of 0.101 kg-N/(m(3).d). This study is useful to supports the application of PN/A in sewage treatment. (C) 2020 Elsevier Ltd. All rights reserved.
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