Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 748, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141367
Keywords
Anammox; Nitrogen removal; Redox-active biochar; Surface functional groups; Microbial community
Categories
Funding
- Shanghai Pujiang Program [18PJ1406300]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- National Natural Science Foundation of China [21908144]
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Biochar is an inexpensive redox-active carbon material that has been demonstrated to enhance microbial nitrogen-transforming processes. However, how redox-active biochar affects anammox remains unclear. Here, the effects of three functionally distinct biochars produced from corn stover biomass at varied pyrolysis temperatures (C5300, CS500, CS800) were evaluated as additives on the anammox performance in three reactors (R300, R550, R800) over the long term, during which nitrogen loading rate was either increased drastically (pulse strategy) or gradually (gradual strategy). Nitrogen removal was achieved at 86.5% (R300), 77.1% (Control), 59.3% (R550) and 57.7% (R800) under pulse strategy, and at 95.4% (R300), 92.3% (R550), 862% (Control) and 82.0% (R800) under gradual strategy, respectively. Compared with Control, addition of CS300 increased abundance of Candidatus Kuenenia with superior anammox activity. (3300 enriched with reduced functional groups (phenolic/hydroquinone) could donate electrons to support bioenergetics of anammox metabolism, whereas electron-accepting CS800 functioned inversely. Overall this study highlights the importance of surface functional groups and redox property of biochar such that determines whether its addition impose stimulatory or suppressive effect on anammox process. (C) 2020 Elsevier B.V. All rights reserved.
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