Biotechnology Bulletin ›› 2017, Vol. 33 ›› Issue (3): 116-121.doi: 10.13560/j.cnki.biotech.bull.1985.2017.03.017

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Screening and Identification of Two Aerobic Denitrifying Phosphorus-accumulating Strains,and Denitrifying Biological Phosphorus Removal

NIE Yi-lei1, JIA Wei1, ZENG Yan-bing2, LUO Li-jing1, CHEN Xing-wei1, ZHUANG Hong1, CHEN Hong1   

  1. 1. Fujian Institute of Microbiology,Fujian Provincial Key Laboratory of Screening for Novel Microbial Products,Fuzhou 350007;
    2. Agricultural Product Quality Safety and Standards Institute, Jiangxi Academy of Agricultural Sciences,Nanchang 330200
  • Received:2016-06-16 Online:2017-03-26 Published:2017-03-07

Abstract: It is aimed to screen highly-efficient aerobic denitrification bacterium simultaneously removing nitrogen and phosphorus(P)from the piggery wastewater sample in a pig farm of Fuzhou. Two effective strains,named as N1 and N2,were acquired by culturing with medium for denitrification strain,then isolating with the BTB streak plate,further screening with the blue- and white-colored spot,and finally dyeing with metachromatic granules and PHB(poly-β-hydroxybutyrate)granule. By 16S rRNA gene sequence analyses,two strains were identified as Achromobacter sp. and Brevundimonas sp.,respectively. Combined strain FIM-1 was formulated with N1 and N2. The effectiveness of their removing the nitrogen and phosphorus in artificial wastewater and eutrophic water was investigated. The results showed that the removal rate of nitrogen by N1,N2,and FIM-1 at 40 h was 9.20%,17.16%,and 32.84% respectively,and the removal rate of total P at 18 h was 14.04%,8.77%,and 28.95%,respectively,indicating that FIM-1 performed better than the single ones.

Key words: aerobic denitrification, phosphorus-accumulating organisms(PAOs), nitrogen and phosphorus removal, eutrophication