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Journal Articles (Review Article) Biotechnology Advances Year : 2020

Purple phototrophic bacteria for resource recovery: Challenges and opportunities

Damien J Batstone
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María Grassino
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  • PersonId : 1164631
Siegfried E Vlaeminck
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  • PersonId : 1037072
Daniel Puyol
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  • PersonId : 1164632
Willy Verstraete
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Robbert Kleerebezem
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Adrian Oehmen
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Anish Ghimire
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Ilje Pikaar
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Juan M Lema
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Tim Hülsen


Sustainable development is driving a rapid focus shift in the wastewater and organic waste treatment sectors, from a "removal and disposal" approach towards the recovery and reuse of water, energy and materials (e.g. carbon or nutrients). Purple phototrophic bacteria (PPB) are receiving increasing attention due to their capability of growing photoheterotrophically under anaerobic conditions. Using light as energy source, PPB can simultaneously assimilate carbon and nutrients at high efficiencies (with biomass yields close to unity (1 g COD biomass •g COD removed −1)), facilitating the maximum recovery of these resources as different value-added products. The effective use of infrared light enables selective PPB enrichment in non-sterile conditions, without competition with other phototrophs such as microalgae if ultraviolet-visible wavelengths are filtered. This review reunites results systematically gathered from over 177 scientific articles, aiming at producing generalized conclusions. The most critical aspects of PPB-based production and valorisation processes are addressed, including: (i) the identification of the main challenges and potentials of different growth strategies, (ii) a critical analysis of the production of value-added compounds, (iii) a comparison of the different value-added products, (iv) insights into the general challenges and opportunities and (v) recommendations for future research and development towards practical implementation. To date, most of the work has not been executed under real-life conditions, relevant for full-scale application. With the savings in wastewater discharge due to removal of


Coenzyme Q10 CSTR Continuous stirred-tank reactor Dark fermentation Dissolved oxygen HRAS High-rate activated sludge HRT Hydraulic retention time HSD Honestly significant difference Internal circulation Interquartile range LED Light-emitting diode MSBR Membrane sequencing batch reactor Number of independent members of a statistical population/sample NADH Nicotinamide adenine dinucleotide NADPH Nicotinamide adenine dinucleotide phosphate NIR Near infrared OLR Organic loading rate ORP Oxidation reduction potential PAnMBR Photoanaerobic membrane bioreactor PBR Photo-bioreactor PHA Polyhydroxyalkanoate PHB Poly(3-hydroxybutyrate) PHBV Poly(3-hydroxy-butyrate-co-3-hydroxyvalerate) PF Photofermentation PNSB Purple non-sulfur bacteria PPB Purple phototrophic bacteria PRBC Photorotating biological contractor PSB Purple sulfur bacteria SBR Sequencing batch reactor SCP Single-cell protein STP Standard temperature and pressure SRT Solid retention time TCA Tricarboxylic acid TCOD Total chemical oxygen demand TS Total solids UASB Up-flow anaerobic sludge blanket UV Ultra violet VFA Volatile fatty acid VIS Visible VSS Volatile suspended solids VS Volatile solids VS frac Organic fraction of total solids Wastewater 5-ALA 5-Animolevulinic acid ⁎ Corresponding author Carotenoids Hydrogen Nutrient recovery Polyhydroxyalkanoates Purple non-sulfur bacteria Purple sulfur bacteria Single-cell protein Waste Wastewater AMBR Aerobic membrane reactor AnMBR Anaerobic membrane bioreactor ANOVA Analysis of variance ATP Adenosine triphosphate BChl Bacteriochlorophylls BOD Biochemical oxygen demand CAGR Compound annual growth rate CAS Conventional activated sludge CBB Calvin-Benson-Bassham COD Chemical oxygen demand CoQ10
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Dates and versions

hal-03777869 , version 1 (13-08-2023)



Gabriel Capson-Tojo, Damien J Batstone, María Grassino, Siegfried E Vlaeminck, Daniel Puyol, et al.. Purple phototrophic bacteria for resource recovery: Challenges and opportunities. Biotechnology Advances, 2020, 43, pp.107567. ⟨10.1016/j.biotechadv.2020.107567⟩. ⟨hal-03777869⟩


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