Effect of operational parameters, environmental conditions, and biotic interactions on bacterial communities present in urban wastewater treatment photobioreactors

Collao, Javiera; Morales-Amaral, María del Mar; Acién-Fernández, Francisco Gabriel; Bolado, Silvia; Fernandez‐Gonzalez, Nuria

doi:10.1016/j.chemosphere.2021.131271

Cited by 23 publications

(18 citation statements)

References 39 publications

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“…The effect of environmental conditions on the macromolecular composition of the produced biomass is shown in Table 1. The composition of the biomass can be strongly affected by environmental and operational conditions [34,37]. The median macromolecular composition of microalgae was reported to be 32.2% protein, 17.3% lipid, 15.0% carbohydrate, 17.3% ash, and 5.7% RNA [38].…”

Section: Discussionmentioning

confidence: 99%

Production of Scenedesmus almeriensis Using Pilot-Scale Raceway Reactors Located inside a Greenhouse

et al. 2022

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The microalga S. almeriensis was produced in spring and summer using 80 m2 raceway reactors located inside a greenhouse in Almería, Spain. This microalga was selected because it is a fast-growing and robust strain with potential applications in the production of functional foods and feeds or as a high-value agricultural biostimulant. Overall, the biomass productivity obtained in summer was 24.9 ± 0.9 g·m−2·day−1. This value was higher than that obtained in spring, with an average value of 21.4 ± 1.3 g·m−2·day−1 (p < 0.05). The Fv/Fm value of the cultures at the stationary phase was comparable and around 0.6, which is the optimum of this strain. No major differences in the macromolecular composition of the biomass were observed between seasons, with an average protein, lipid, ash, and carbohydrate content of 37.9, 4.6, 10.8, and 46.7%, respectively. The data reported herein were used to validate a previously described model. The differences between the experimental and the predicted biomass productivities were below 5% in spring and 8% in summer, although a larger dataset is needed to validate the model. Overall, results supported the robustness of the selected strain and its utilisation in different industrial sectors.

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Section: Discussionmentioning

confidence: 99%

Production of Scenedesmus almeriensis Using Pilot-Scale Raceway Reactors Located inside a Greenhouse

et al. 2022

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“…Moreover, a recent study suggested that the dilution rate as well as environmental conditions play a key role in the composition of the consortia, with heterotrophs and phototrophs mainly from the family Rhodobacteraceae dominating Scenedesmus sp. cultures (Collao et al, 2021). Further studies on this topic are needed as the microbial community present during microalgae cultivation highly influences the performance of the system in terms of both, biomass production and nutrient recoveries (Lian et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Annual production of microalgae in wastewater using pilot-scale thin-layer cascade photobioreactors

et al. 2021

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Microalgae based wastewater treatment has been suggested as an alternative to polluting and energy-consuming conventional processes. The main advantage of this strategy is the dual role of microalgae: they recover nutrients from waste and simultaneously produce biomass with varied industrial applications. In the current study, biomass of Scenedesmus sp. was produced using primary wastewater in two pilot-scale thin-layer cascade photobioreactors (63 and 126 m 2 ). The wastewater used for microalgal growth was not subjected to any conventional treatment process, besides removal of solids, and contained a variable N-NH4 + content of 83.0-210.6 mg•L -1 . Biomass productivity values were comparable to those obtained when operating using freshwater and commercial chemicals as nutrient sources. When operating at a dilution rate of 0.3 day -1 , the average annual productivity was 24.8 g•m -2 •day -1 (82.0 t•ha -2 •year 1 ) with a maximum of 32.8 g•m -2 •day -1 in summer. Inorganic nitrogen and phosphorus removal rates varied between 695.4-2383.4 and 70.4-111.8 mg•m -2 •day -1 respectively. Production of Scenedesmus sp. using wastewater would allow not only to process large volumes of water that could be reused for agricultural irrigation or safely disposed into water streams, but also reduce production costs by 0.44 €•kg -1 , based on a preliminary economic analysis. Overall, results demonstrate that thin-layer cascade reactors can be used to effectively remove nutrients from wastewater while simultaneously produce valuable biomass with potential applications in agriculture or animal feed production.

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“…Large 11.8 m 3 raceway reactors were used and operated in semi-continuous mode. Fluctuations in culture and environmental conditions can influence microbial diversity and therefore, depuration efficiency [27]. The current study will also discuss the effect of environmental conditions namely temperature and solar radiation on the performance of the system.…”

Section: Introductionmentioning

confidence: 98%

Year-long evaluation of microalgae production in wastewater using pilot-scale raceway photobioreactors: Assessment of biomass productivity and nutrient recovery capacity

et al. 2021

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Effect of operational parameters, environmental conditions, and biotic interactions on bacterial communities present in urban wastewater treatment photobioreactors

Cited by 23 publications

References 39 publications

Production of Scenedesmus almeriensis Using Pilot-Scale Raceway Reactors Located inside a Greenhouse

Production of Scenedesmus almeriensis Using Pilot-Scale Raceway Reactors Located inside a Greenhouse

Annual production of microalgae in wastewater using pilot-scale thin-layer cascade photobioreactors

Year-long evaluation of microalgae production in wastewater using pilot-scale raceway photobioreactors: Assessment of biomass productivity and nutrient recovery capacity

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