Fast development of purple nonsulfur bacteria (PNSB) in a bubble column photobioreactor: influence of carbon source and dissolved O2 availability on wastewater treatment performance

Photobioreactors with purple nonsulfur bacteria (PNSB) constitute a promising technology for wastewater treatment, gas purification, and high value-added bioproducts. In this work, different operational strategies were tested to investigate their impacts on photobioreactor performance, biomass properties, and microbial community. It showed that the operational conditions significantly influence the performance and microbial composition of PNSB photobioreactors. Anaerobic conditions favored the dominance of Rhodopseudomonas spp. and moderate COD removal efficiency (36.7%), while aerobic conditions significantly enhanced COD removal efficiency (91.7%) but altered the microbial community composition from PNSB to aerobic heterotrophic microorganisms, such as Delftia sp. and Microbacterium sp.. The removal ratio of chemical oxygen demand (COD):N:P was 100:10:2 under anaerobic conditions with continuous CO2 supply, while it was 100:1:1 under aerobic conditions with continuous supply of a CO2/O2 mixture. Net CO2 removal efficiencies of 2.8% and 5.4% were recorded under anaerobic conditions with and without the addition of organic carbon, respectively. The outlet CO2 concentration showed that CO2 uptake occurred under dark and anaerobic conditions without organic carbon. The reduced production of extracellular polymeric substances (EPS) was observed after COD was removed from the influent, preventing granule formation.

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Work Title Fast development of purple nonsulfur bacteria (PNSB) in a bubble column photobioreactor: influence of carbon source and dissolved O2 availability on wastewater treatment performance
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Open Access
Creators
  1. Tengge Zhang
  2. Guillermo Quijano
  3. Meng Wang
Keyword
  1. Anaerobic condition
  2. CO2 uptake
  3. COD removal
  4. Microbial community
  5. 36 Wastewater treatment
License In Copyright (Rights Reserved)
Work Type Article
Acknowledgments
  1. This work was funded by the U.S. National Science Foundation under grant #2105726. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The technical support from Dr. Gratia Deii Flores Salgado is gratefully acknowledged.
Publisher
  1. Journal of Water Process Engineering
Publication Date August 2024
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.jwpe.2024.105885
Deposited November 04, 2024

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Version 1
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  • Updated Publisher Identifier (DOI), Description, Publication Date Show Changes
    Publisher Identifier (DOI)
    • https://doi.org/10.1016/j.jwpe.2024.105885
    Description
    • Photobioreactors with purple nonsulfur bacteria (PNSB) constitute a promising technology for wastewater treatment, gas purification, and high value-added bioproducts. In this work, different operational strategies were tested to investigate their impacts on photobioreactor performance, biomass properties, and microbial community. It showed that the operational conditions significantly influence the performance and microbial composition of PNSB photobioreactors. Anaerobic conditions favored the dominance of Rhodopseudomonas spp. and moderate COD removal efficiency (36.7%), while aerobic conditions significantly enhanced COD removal efficiency (91.7%) but altered the microbial community composition from PNSB to aerobic heterotrophic microorganisms, such as Delftia sp. and Microbacterium sp.. The removal ratio of chemical oxygen demand (COD):N:P was 100:10:2 under anaerobic conditions with continuous CO2 supply, while it was 100:1:1 under aerobic conditions with continuous supply of a CO2/O2 mixture. Net CO2 removal efficiencies of 2.8% and 5.4% were recorded under anaerobic conditions with and without the addition of organic carbon, respectively. The outlet CO2 concentration showed that CO2 uptake occurred under dark and anaerobic conditions without organic carbon. The reduced production of extracellular polymeric substances (EPS) was observed after COD was removed from the influent, preventing granule formation.
    Publication Date
    • 2024-07
  • Updated Acknowledgments Show Changes
    Acknowledgments
    • This work was funded by the U.S. National Science Foundation under grant #2105726. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The technical support from Dr. Gratia Deii Flores Salgado is gratefully acknowledged.
  • Added Creator Tengge Zhang
  • Added Creator Guillermo Quijano
  • Added Creator Meng Wang
  • Added Manuscript_revision_nomark.pdf
  • Updated
  • Updated License Show Changes
    License
    • https://rightsstatements.org/page/InC/1.0/
  • Published
  • Updated
  • Updated Keyword, Publisher, Publication Date Show Changes
    Keyword
    • Anaerobic condition , CO2 uptake , COD removal , Microbial community , 36 Wastewater treatment
    Publisher
    • Journal of Water Process Engineering
    Publication Date
    • 2024-07
    • 2024-08