4.8 Article

A novel Pseudomonas aeruginosa strain performs simultaneous heterotrophic nitrification-aerobic denitrification and aerobic phosphate removal

期刊

WATER RESEARCH
卷 221, 期 -, 页码 -

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118823

关键词

Heterotrophic nitrification-aerobic denitrification; Simultaneous nitrogen and phosphate removal; Aerobic phosphate removal model; Nitrogen removal pathway; Phosphorus species

资金

  1. National Nat- ural Science Foundation of China [51878010, 52170064]
  2. Project of High-level Teachers in Beijing Municipal Universities in the Period of the 13th Five-year Plan [CIT TCD20190310]

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A novel strain affiliated with Pseudomonas aeruginosa was isolated in this study, which was capable of heterotrophic nitrification-aerobic denitrification and aerobic phosphate removal. Under optimal conditions, the strain showed high removal efficiencies of ammonium (87%) and phosphate (97%). Gene amplification experiments revealed that the ammonium removal followed the complete HN-AD pathway, while phosphate removal only occurred under aerobic conditions.
Nitrogen and phosphate removal from wastewater relies on different functional bacteria. In this study, a novel strain affiliated with Pseudomonas aeruginosa was isolated from activated sludge by gradient dilution and per-formed heterotrophic nitrification-aerobic denitrification and aerobic phosphate removal (HNADPR). The strain showed an ammonium removal efficiency of 87% and a phosphate removal efficiency of 97% under optimal conditions, such as C/N ratio of 10, P/N ratio of 0.1, temperature of 30C, and pH of 7.5-8.5. The modified Gompertz model could fit well the heterotrophic ammonium nitrification, aerobic nitrite/nitrate denitrification, and aerobic phosphate removal processes. Functional gene amplification indicated that ammonium removal followed the complete HN-AD pathway (NH4+ -> NH2OH -> NO2- -> NO3? -> NO2- -> NO -> N2O -> N-2). Phosphate removal only occurred under aerobic conditions and ceased under anaerobic conditions. In successive aerobic cycles, the strain persistently took up phosphate. In wastewater, phosphate was aerobically converted into cell membrane, intracellular and extracellular polymeric substrates (EPS). Phosphorus in the form of phosphate monoester was pooled in EPS. A hypothetic aerobic phosphate removal model for strain SNDPR-01 is proposed to improve our understanding of the novel bacterial function of HNADPR.

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