Journal
BIOCHEMICAL ENGINEERING JOURNAL
Volume 143, Issue -, Pages 34-40Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2018.12.009
Keywords
Semiconductor wastewater; Partial nitrification; Ammonia-oxidizing bacteria activity; Nitrite-oxidizing bacteria activity; Microbial community structure and composition; Online monitoring of nitrifier activity
Funding
- New Energy and Industrial Technology Development Organization from Japan [11813001d]
- Japan Society for the Promotion of Science (JSPS) International Research Fellowship from Japan [P17052]
- National Natural Science Foundation of China [41877344]
- One -Hundred Scholar Award of Chinese Academy of Sciences [Y82Z08-1-401, Y75Z01-1-401]
- National Water Science and Technology Projects from China [2018ZX07208001]
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The aims of this study were to investigate the feasibility of partial nitrification (PN) in a sequencing batch reactor (SBR) fed with real wastewater discharged from the washing process at a semiconductor factory, to evaluate the efficacy of online control for nitrite buildup, and to examine the microbial community composition. To this end, online monitoring of NH4+ and NO3- concentrations in an SBR was implemented to track the extant activities of ammonia-oxidizing (AOB) and nitrite-oxidizing bacteria (NOB). The results showed that the rate of NH4+ oxidation by AOB increased during the first 20 days of the operation, and were maintained as high as a maximum volumetric rate of NH4+ removal of 2.17 kg-N/m(3)/day with an NH4+ removal efficiency of 94.1-99.8%. Successful nitrite buildup (> 99.9%) has been achieved after day 20 when AOB activity was 8.11-times higher than NOB activity. High-throughput sequencing of 16S rRNA genes manifested that the relative abundance of cluster 7 Nitrosomonas species in the family Nitrosomonadaceae increased from 0.2% to 50% over total bacteria. On the other hand, the relative abundance of Nitrospira spp. as the predominant NOB decreased from 1.0% to 0.05%, indicating NOB out-selection during SBR operations. A positive correlation was noted between the abundance of the dominant AOB and NH4+ oxidation rate, suggesting that a simple nitrifier community regulated high-rate PN.
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