Who contributes more to N2O emission during sludge bio-drying with two different aeration strategies, nitrifiers or denitrifiers? | Zendy

Junya Zhang | Zendy; Yuanyue Wang | Zendy; Dawei Yu | Zendy; Juan Tong | Zendy; Meixue Chen | Zendy; Qianwen Sui | Zendy; Buhe Chulu | Zendy; Yuansong Wei | Zendy

Open Access

Who contributes more to N2O emission during sludge bio-drying with two different aeration strategies, nitrifiers or denitrifiers?

Author(s) -

Junya Zhang,

Yuanyue Wang,

Dawei Yu,

Juan Tong,

Meixue Chen,

Qianwen Sui,

Buhe Chulu,

Yuansong Wei

Publication year - 2016

Publication title -

applied microbiology and biotechnology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.074

H-Index - 221

eISSN - 1432-0614

pISSN - 0175-7598

DOI - 10.1007/s00253-016-8018-2

Subject(s) - aeration , denitrification , nitrous oxide , nitrification , environmental science , environmental chemistry , environmental engineering , aerobic denitrification , chemistry , denitrifying bacteria , pulp and paper industry , nitrogen , engineering , organic chemistry

Global warming effects have drawn more and more attention to studying all sources and sinks of nitrous oxide (N 2 O). Sludge bio-drying, as an effective sludge treatment technology, is being adopted worldwide. In this study, two aeration strategies (piles I and II) were compared to investigate the primary contributors to N 2 O emission during sludge bio-drying through studying the evolution of functional genes involved in nitrification (amoA, hao, and nxrA) and denitrification (narG, nirS, nirK, norB, and nosZ) by quantitative PCR (qPCR). Results showed that the profile of N 2 O emission can be divided into three stages, traditional denitrification contributed largely to N 2 O emission at stage I (days 1-5), but N 2 O emission mainly happened at stage II (days 5-14) due to nitrifier denitrification and NH 2 OH accumulation by ammonia-oxidizing bacteria (AOB), accounting for 51.4% and 58.2% of total N 2 O emission for piles I and II, respectively. At stage III (days 14-21), nitrifier denitrification was inhibited because sludge bio-drying proceeded mainly by the physical aeration, thus N 2 O emission decreased and changed little. The improved aeration strategy availed pile I to reduce N 2 O emission much especially at stages II and III, respectively. These results indicated that nitrifier denitrification by AOB and biological NH 2 OH oxidation due to AOB made more contribution to N 2 O emission, and aeration strategy was crucial to mitigate N 2 O emission during sludge bio-drying.

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