Abstract：
:Dissolved oxygen (DO) level is crucial in shaping bacterial community and impacts biological nitrogen removal and nitrous oxide (N2O) emission. Online gaseous and off-line dissolved N2O under varying DO levels through aeration rate alternations were measured in lab-scale anoxic-oxic reactors. It showed that sharp changes in DO levels caused immediate N2O emission increase, while the total average gaseous N2O emission stabilized at 0.011%, 0.046%, 0.308% and 0.229% of influent nitrogen as DO in oxic tanks averaged at 0.58, 1.67, 3.2 and 6.12 mg/L, respectively. Process with an average DO concentration of 1.67 mg/L had the highest microbial diversity and relative abundances of potential denitrifers and ammonia-oxidizing bacteria (NOB), while the least ammonia-oxidizing bacteria (AOB) were detected, which contributed to efficient nitrogen removal and minor N2O emission. In conclusion, regulation and control of denitrifiers, AOB and NOB with the determination of a proper DO set point is feasible for N2O mitigation.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Guo J,Cong Q,Zhang L,Meng L,Ma F,Zhang Jdoi
10.1016/j.biortech.2019.121809subject
Has Abstractpub_date
2019-11-01 00:00:00pages
121809eissn
0960-8524issn
1873-2976pii
S0960-8524(19)31039-9journal_volume
291pub_type
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