Abstract：
:Bioaugmentation was used to upgrade the nitrification process in a full-scale municipal WWTP with an A2/O system. A mixture of nitrifying bacteria was inoculated into the bioreactor for a final concentration of 1% (v/v). The upgrade process took 25 days, and the NH4+-N removals reached 94.6% (increased at least by 75%). The effluent concentrations of COD and NH4+-N stabilized at <30 mg/L and <4 mg/L even when the corresponding influent concentrations were over 300 mg/L and 60 mg/L, which met the first-class requirement of the National Municipal Wastewater Discharge Standards of China (COD ≤ 50 mg/L, NH4+-N ≤ 5 mg/L). The succession of the microbial community showed the enhanced NH4+-N removal efficiency mainly resulted from the persistence of introduced ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), which increased from 0% to 0.4% and from 0.01% to 2.1%, respectively. This bioaugmentation was shown as an effective technology for upgrading or retrofitting conventional systems to tertiary-level.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Liu F,Hu X,Zhao X,Guo H,Zhao Y,Jiang Bdoi
10.1016/j.biortech.2017.10.076subject
Has Abstractpub_date
2018-02-01 00:00:00pages
1062-1065eissn
0960-8524issn
1873-2976pii
S0960-8524(17)31905-3journal_volume
249pub_type
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