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Achieving nitrogen and phosphorus removal at low C/N ratios without aeration through a novel phototrophic process

Carvalho, V.C.F. ; Kessler, M. ; Fradinho, J.C. ; Oehmen, A. ; Reis, M.A.M.

The Science of the total environment, 2021-11, Vol.793, p.148501-148501, Article 148501 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Achieving nitrogen and phosphorus removal at low C/N ratios without aeration through a novel phototrophic process
  • Autor: Carvalho, V.C.F. ; Kessler, M. ; Fradinho, J.C. ; Oehmen, A. ; Reis, M.A.M.
  • Assuntos: Biological nutrients removal (BNR) ; Greenhouse gases (GHG) ; Microalgae-bacterial consortium ; Nitrogen removal ; No aeration ; Polyphosphate accumulating organisms (PAOs)
  • É parte de: The Science of the total environment, 2021-11, Vol.793, p.148501-148501, Article 148501
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Conventional wastewater treatment technologies for biological nutrient removal (BNR) are highly dependent on aeration for oxygen supply, which represents a major operational cost of the process. Recently, phototrophic enhanced biological phosphorus removal (photo-EBPR) has been suggested as an alternative system for phosphorus removal, based on a consortium of photosynthetic microorganisms and chemotrophic bacteria, eliminating the need for costly aeration. However, wastewater treatment plants must couple nitrogen and phosphorus removal to achieve discharge limits. For this reason, a new microalgae-bacterial based system for phosphorus and nitrogen removal is proposed in this work. The photo-BNR system studied here consists of a sequencing batch reactor operated with dark anaerobic, light aerobic, dark anoxic and idle periods, to allow both N and P removal. Results of the study show that the photo-BNR system was able to remove 100% of the 40 mg N/L of ammonia fed to the reactor and 94 ± 3% of the total nitrogen (Influent COD:N ratio of 300:40, similar to domestic wastewater). Moreover, an average of 25 ± 9.2 mg P/L was simultaneously removed in the photo-BNR tests, representing the P removal capacity of this system, which exceeds the level of P removal required from typical domestic wastewater. Full ammonia removal was achieved during the light phase, with 67 ± 5% of this ammonia being assimilated by the microbial culture and the remaining 33 ± 5% being converted into nitrate. The assimilated P corresponded to 2.8 ± 0.23 mg P/L, which only represented, approximately, 1/9 of the P removal capacity of the system. Half of the nitrified ammonia was subsequently denitrified during the dark anoxic phase (50 ± 24%). Overall, the photo-BNR system represents the first treatment alternative for N and P from domestic wastewater with no need of mechanical aeration or supplemental carbon addition, representing an alternative low-energy technology of interest. [Display omitted] •A novel Photo - Biological Nutrient removal process was developed.•Photosynthetic-Chemoheterotrophic bacteria consortium selected under dark/light cycles.•Efficient N removal at a low COD/N ratio was achieved mainly by biomass assimilation.•High concentrations of P and N removed without the need of aeration.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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