期刊
ECOLOGICAL ENGINEERING
卷 99, 期 -, 页码 199-208出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2016.11.030
关键词
Denitrifying phosphate-accumulating bacterium; Screening; Identification; Biological characteristics
资金
- Fundamental Research Funds for Central Universities of South-Central University for Nationalities [CZW15054]
A new denitrifying phosphorus-accumulating bacterium HW-15 was screened out from phosphorus-rich wastewater and was identified as Enterobacter cloacae sp. based on its physiological-biochemical characteristics and 16S rDNA sequence analysis. The shift in microbial community structure during acclimation was determined through high-throughput sequencing and Enterobacter was found to be the dominant genus. Strain HW-15 exhibited efficient simultaneous denitrifying and phosphorus removal, and achieved both heterotrophic nitrification and aerobic denitrification process, and demonstrated a preference for consuming nitrogen sources in order of NH+ 4-N > NO- 3-N > NO- 2-N. The application of strain HW-15 in real wastewater samples resulted in NH+ 4-N, NO- 3-N, NO- 2-N and PO3-4-P removal efficiencies of 99%, 88%, 59%, and 73%, respectively. Besides, strain HW-15 was found to simultaneously remove nutrient and arsenic(V) at an arsenic(V) concentration lower than 1.5 mg/L. During anaerobic-aerobic culture period, the polyhydroxyalkanoate (PHA) content in HW-15 cells presented a dynamic change, and resulted in PO3- 4-P removal efficiency of 61.97%. Strain HW-15 could process NH+ 4-N to NO- 2-N and then to gaseous nitrogen. (C) 2016 Elsevier B.V. All rights reserved.
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