Potential of the cyanobacteria Anabaena sp. and Dolichospermum sp. for being produced using wastewater or pig slurry: Validation using pilot-scale raceway reactors

Morillas-España, Ainoa; Sánchez-Zurano, Ana; Gómez-Serrano, Cintia; Ciardi, Martina; Acién, Gabriel; Clagnan, Elisa; Adani, Fabrizio; Lafarga, Tomás

doi:10.1016/j.algal.2021.102517

Cited by 22 publications

(2 citation statements)

References 42 publications

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“…and Dolichospermum sp. ( Morillas-España et al, 2021a ). Assuming a biomass phosphorus content of 2%, 30%–65% of the total phosphorus that entered the system was assimilated into biomass, while 20%–70% was still present in the outlet effluent.…”

Section: Resultsmentioning

confidence: 99%

Integrating microalgae-based wastewater treatment, biostimulant production, and hydroponic cultivation: a sustainable approach to water management and crop production

Morillas-España,

Pérez-Crespo,

Villaró-Cos

et al. 2024

Front. Bioeng. Biotechnol.

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A natural appearing microalgae-bacteria consortium was used to process urban wastewater. The process was done in an 80 m2 raceway reactor and the results were compared to an identical reactor operated using freshwater supplemented with commercial fertilisers. The biomass harvesting was done using commercial ultrafiltration membranes to reduce the volume of culture centrifuged. The membrane allowed achieving a biomass concentration of ∼9–10 g L−1. The process proposed avoids the use of centrifuges and the drying of the biomass, two of the most energy consuming steps of conventional processes. The specific growth rate in freshwater and the wastewater-based media was estimated as 0.30 ± 0.05 and 0.24 ± 0.02 days−1, respectively (p < 0.05). The maximum concentration reached at the end of the batch phase was 0.96 ± 0.03 and 0.83 ± 0.07 g L−1 when the biomass was produced using freshwater and wastewater, respectively (p < 0.05). The total nitrogen removal capacity of the system was on average 1.35 g m−2·day−1; nitrogen assimilation into biomass represented 60%–95% of this value. Furthermore, the P-PO43− removal capacity of the system varied from 0.15 to 0.68 g m−2·day−1. The outlet effluent of the reactor was used as a nutrient source in the hydroponic production of zucchini seedlings, leading to an increase in the root dry weight and the stem diameter compared to the water alone. The produced biomass showed potential for use as feedstock to produce plant biostimulants with positive effects on root development and chlorophyll retention.

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Section: Resultsmentioning

confidence: 99%

Integrating microalgae-based wastewater treatment, biostimulant production, and hydroponic cultivation: a sustainable approach to water management and crop production

Morillas-España,

Pérez-Crespo,

Villaró-Cos

et al. 2024

Front. Bioeng. Biotechnol.

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“…According to this, many studies have been carried out where cyanobacteria are used as a bioremediation tool in order to treat wastewater e uents of various origins including pig slurries, domestic activities, aqua culture systems e.t.c (Ansari et al 2017;Morillas-España et al 2021;Winayu et al 2021;Samiotis et al 2021). Worth mentioning that some cyanobacteria strains may produce cyanotoxins, while other species such as Synechococcus elongatus PCC 7942 (hereafter S7942) do not produce cyanotoxins and under saline stress can increase its intracellular sucrose accumulation leading to increased yields of biofuels (biodiesel, bioethanol, biogas, bio-hydrogen) or/and relevant industrial products from S7942 (Stamatakis et al 1999;Vayenos et al 2000;Nowruzi et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Wastewater Substrate Disinfection for Application of Synechococcus Elongatus PCC 7942 Cultivation as Tertiary Treatment

Samiotis

Ziagova

Amanatidou

2021

Preprint

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The cultivation of microalgae or/and cyanobacteria in nutrient-rich wastewaters presents a significant opportunity for enhancing sustainability of tertiary wastewater treatment processes via resources/energy recovery/production. However, maintaining a monoculture in wastewater-media constitutes a significant challenge to be addressed, as a plethora of antagonistic and predating microorganisms exist is such media. In this regard, the present work assesses the efficiency of the low-cost wastewater substrate disinfection techniques of filtration, use of NaClO, H2O2 or Fe(VI), in terms of antagonistic or/and predating microbial species growth inhibition in Synechococcus elongatus PCC 7942 cultivations. Nitrates and phosphates removal rates were also experimentally assessed. The results showed that filter thickness has a greater effect on disinfection efficiency than that of filter’s pore size. Furthermore, the disinfection efficiency of Fe(VI), which was produced on-site by electrosynthesis via a Fe0/Fe0 cell, was greater than that of NaClO and H2O2. Filtration at ≤ 1.2 µm pore size coupled with chemical disinfection leads to unhindered S7942 growth and efficient nitrates and phosphates removal rates, at dosages of CT ≥ 270 mg min L−1 for NaClO and CT ≥ 157 mg min L−1 for Fe(VI). The coagulation action of Fe(III) species that result from Fe(VI) reduction and the oxidation action of Fe(VI) can assist in turbidity, organic compounds and phosphorous removal from wastewater-media. Moreover, the residual iron species can assist in S7942 harvesting and may enhance photosynthesis rate. Thus, the utilization of wastewaters for S7942 cultivation as tertiary treatment seems a promising and novel alternative to common nutrient removal processes that can reduce environmental footprint and operational costs of wastewater treatment plants.

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Reduction in water consumption during the production of microalgae using diluted pig slurry in thin-layer cascade photobioreactors

et al. 2022

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Potential of the cyanobacteria Anabaena sp. and Dolichospermum sp. for being produced using wastewater or pig slurry: Validation using pilot-scale raceway reactors

Cited by 22 publications

References 42 publications

Integrating microalgae-based wastewater treatment, biostimulant production, and hydroponic cultivation: a sustainable approach to water management and crop production

Integrating microalgae-based wastewater treatment, biostimulant production, and hydroponic cultivation: a sustainable approach to water management and crop production

Wastewater Substrate Disinfection for Application of Synechococcus Elongatus PCC 7942 Cultivation as Tertiary Treatment

Reduction in water consumption during the production of microalgae using diluted pig slurry in thin-layer cascade photobioreactors

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