Light attenuation in enriched purple phototrophic bacteria cultures: Implications for modelling and reactor design

Capson-Tojo, Gabriel; Batstone, Damien J.; Grassino, María; Hülsen, Tim

doi:10.1016/j.watres.2022.118572

Cited by 17 publications

(14 citation statements)

References 55 publications

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“…The work of Durán et al (2020) was used as base to represent non-PPB S-related processes. Different studies were used for PPB-related processes (Capson-Tojo et al, 2022, 2021Egger et al, 2020;Puyol et al, 2020Puyol et al, , 2017. Predation was modelled according to Ni et al (2011) and Moussa et al (2005), and microalgae growth according to Wágner et al (2016).…”

Section: Components Processes and Inhibitory Factorsmentioning

confidence: 99%

“…The Steele's equation was used to represent the influence of light intensity on uptake rates of algae (Béchet et al, 2013;Ruiz-Martínez et al, 2016;Wágner et al, 2016). For PPB, a Monod inhibition function was used (no photoinhibition was observed in common illumination ranges) (Capson-Tojo et al, 2022;Puyol et al, 2017). The general expression is as follows:…”

Section: Changing Environmental Conditions: Influence Of Light Intens...mentioning

confidence: 99%

“…Light attenuation through the culture was modelled using the Lambert-Beer equation, applying an empirical power relationship to model the effect of biomass concentration on the attenuation coefficients (Capson-Tojo et al, 2022). The average light intensity in the growth media (I ave ) was used as input for biological growth (Béchet et al, 2013).…”

Section: Changing Environmental Conditions: Influence Of Light Intens...mentioning

confidence: 99%

“…To do so, main physico-chemical processes have also been considered (e.g., speciation and chemical equilibria of main species, or gasliquid mass transfer). The impact of varying temperatures and light intensities on PPB growth rates, as well as light attenuation through the culture, have also been included (Capson-Tojo et al, 2022). The model was calibrated and validated using data from different operational periods from a demonstration-scale flat plate reactor (Hülsen et al, 2022b), and with batch tests.…”

Section: Introductionmentioning

confidence: 99%

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Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors

2023

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Section: Components Processes and Inhibitory Factorsmentioning

confidence: 99%

Section: Changing Environmental Conditions: Influence Of Light Intens...mentioning

confidence: 99%

Section: Changing Environmental Conditions: Influence Of Light Intens...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors

2023

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“…The major advantage of such a setup is the energy and cost savings associated with using natural light for photosynthesis (Costa and de Morais 2014). A drawback to this type of reactor is the insufficient penetration of sunlight through the depth of the pond, as concentrated PNSB cultures reportedly permit 5 cm light penetration, negatively impacting biomass yields (Capson-Tojo et al 2022). Also, there is the relative ease of contamination due to outdoor exposure and the requirement for a large area of land for largescale setup (Murthy 2011).…”

Section: Reactor Designmentioning

confidence: 99%

Single-cell protein production from purple non-sulphur bacteria-based wastewater treatment

Wada

Vincent

Mackey

2022

Rev Environ Sci Biotechnol

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Large-scale production of single-cell protein (SCP) has the potential not only to solve some of the food insecurity and water scarcity crises that plague a significant portion of our world today but also holds the promise to reduce the cost associated with the treatment of industrial and agricultural wastewater. Resource recovery of SCP from organic waste by microbes like yeast and microalgae is commonly documented. However, recently, a class of phototrophic bacteria, purple non-sulphur bacteria (PNSB), has emerged as a favourable option in terms of both wastewater treatment and resource recovery. PNSB are metabolically versatile and tolerant to a wide range of conditions, hence their ability to thrive in diverse waste streams. Besides its rich protein content, PNSB contains other nutritionally valuable bioproducts like carotenoids, coenzyme Q10, 5-aminolevulinic acid, and pantothenic acid. Recent evidence also indicates that PNSB-based aquafeed enhances growth and boosts immunity in certain aquaculture trials. It does not possess the same toxicity as most gram-negative bacteria due to its comparatively less potent lipopolysaccharide composition. With diverse promising prospects of PNSB-based SCP, it is critical to extensively examine the landscape from a holistic standpoint, highlighting the potential challenges large-scale SCP production may pose. Thus, this review explores the comparative advantages of utilizing PNSB for SCP production, essential components of PNSB-based SCP processing, and possible environmental and economic gains associated with the process. Current challenges with PNSB-based SCP production and future outlooks are also examined.

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Converting Fuel‐Synthesis Process Water to Aquaculture Feed by Purple Non‐Sulfur Bacteria

et al. 2023

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The availability of agricultural wastewater in arid climes limits the possibility of exploiting purple non‐sulfur bacteria (PNSB) to recover aqua‐feed bioproducts. Thus, this study examines the feasibility of recovering such bioproducts using fuel‐synthesis process water (FSPW) as a feedstock. Experiments were performed under varying light conditions. The results revealed that PNSB cultured in the zero‐nitrogen feedstock had over 40 % protein content, contained substantial lipids and pigments, and reduced FSPW organics by over 70 %. The light intensity significantly impacted biomass constituents and treatment efficiency. The results are promising for the potential development of a circular economy to convert FSPW to aqua‐feed.

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Light attenuation in enriched purple phototrophic bacteria cultures: Implications for modelling and reactor design

Cited by 17 publications

References 55 publications

Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors

Expanding mechanistic models to represent purple phototrophic bacteria enriched cultures growing outdoors

Single-cell protein production from purple non-sulphur bacteria-based wastewater treatment

Converting Fuel‐Synthesis Process Water to Aquaculture Feed by Purple Non‐Sulfur Bacteria

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