Selection of cyanobacteria over green algae in a photo-sequencing batch bioreactor fed with wastewater

Arias, Dulce M.; Rueda, Estel; García-Galán, María Jesús; Uggetti, Enrica; García, Jesús Miguel Bairán

doi:10.1016/j.scitotenv.2018.10.342

Cited by 34 publications

(12 citation statements)

References 40 publications

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“… 45 Cyanobacteria remained the dominant clade in the three photobioreactors throughout the entire experimental period for PBR-0%, PBR-15%, and PBR-25%, ranging from a minimum of 55, 65, and 55% to a maximum of 80, 72, and 73% respectively ( Figure 3 , G). These results support the studies performed by Arias et al, 23 , 27 where cyanobacterial cocultures were used to treat secondary effluents, highlighting the relevance of cyanobacteria’s dual-role of treating wastewater and producing valuable products. 46 Average abundance of cyanobacteria in the biomass grown in PBR-0% (60 ± 6%) was significantly lower than in PBR-15% (68 ± 4%, p-value = 3.1 × 10 –5 ) and PBR-25% (65 ± 5%, p-value = 0.033), while there was no significant difference between the last two (p-value = 0.089).…”

Section: Resultssupporting

confidence: 90%

“…Biomass flocs were dissociated by homogenizing the sample for 1 min at 10 000 rpm (Polytron PT 2500 E Homogenizer, Kinematica, U.S.A.). Cell counts were performed fortnightly, with 25 μL of homogenized sample, at 40× and alternating bright field and fluorescence microscopy with an excitation filter (510–560 nm), emission filter (590 nm), and dichroic beam splitter (575 nm) following the microscopic area counting protocol proposed by Arias et al 27 and Guillard and Sieracki. 28 A detailed description of the method used for cell counting can be found in the Supporting Information file.…”

Section: Methodsmentioning

confidence: 99%

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Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Arashiro

Ferrer

Pániker

et al. 2020

ACS Sustainable Chem. Eng.

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This study assessed the recovery of natural pigments (phycobiliproteins) and bioenergy (biogas) from microalgae grown in wastewater. A consortium of microalgae, mainly composed by Nostoc , Phormidium , and Geitlerinema , known to have high phycobiliproteins content, was grown in photobioreactors. The growth medium was composed by secondary effluent from a high rate algal pond (HRAP) along with the anaerobic digestion centrate, which aimed to enhance the N/P ratio, given the lack of nutrients in the secondary effluent. Additionally, the centrate is still a challenging anaerobic digestion residue since the high nitrogen concentrations have to be removed before disposal. Removal efficiencies up to 52% of COD, 86% of NH 4 + -N, and 100% of phosphorus were observed. The biomass composition was monitored over the experimental period in order to ensure stable cyanobacterial dominance in the mixed culture. Phycocyanin and phycoerythrin were extracted from harvested biomass, achieving maximum concentrations of 20.1 and 8.1 mg/g dry weight, respectively. The residual biomass from phycobiliproteins extraction was then used to produce biogas, with final methane yields ranging from 159 to 199 mL CH 4 /g VS. According to the results, by combining the extraction of pigments and the production of biogas from residual biomass, we would not only obtain high-value compounds, but also more energy (around 5–10% higher), as compared to the single recovery of biogas. The proposed process poses an example of resource recovery from biomass grown in wastewater, moving toward a circular bioeconomy.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Arashiro

Ferrer

Pániker

et al. 2020

ACS Sustainable Chem. Eng.

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“…Furthermore, Faleschini et al (2012) reported maximum biochemical oxygen demand (BOD 5 ) load of 60 kg BOD 5 ·ha −1 days −1 for a WSP operated in a temperate climate region. On the other hand, long HRTs can make the culture be nutrient‐limited, thus favoring the proliferation of superior organisms such as protozoa and rotifers which can compete with and/or predate microalgae (Arias et al, 2019; González‐Camejo, Jiménez‐Benítez, et al, 2019a). decoupling SRT from HRT.…”

Section: Microalgae Cultivationmentioning

confidence: 99%

Outdoor microalgae‐based urban wastewater treatment: Recent advances, applications, and future perspectives

et al. 2021

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Although microalgae‐based wastewater treatment has been traditionally carried out in extensive waste stabilization ponds, recent trends focus on the use of microalgae to apply the circular economy principles in the wastewater treatment sector due to the capacity of algae to absorb carbon dioxide while recovering nutrients from sewage. To this aim, the development of new intensive microalgae‐based systems with higher efficiency and level of process control is required. Results obtained for these systems at lab scale are generally promising. However, upscaling to outdoor conditions is often uncertain. Some advances have been made in terms of applying open systems at large scale. However, there are still some issues related to land requirements and the economic feasibility and robustness of the process that have to be overcome to widely implement these systems. This article aims at describing the main design and operating factors regarding outdoor microalgae cultivation. It will also explain some microalgae cultivation technologies to treat wastewater, showing their advantages, disadvantages, and the possibility to treat different wastewater streams with microalgae cultures. Future perspectives of this biotechnology will be commented as well. This article is categorized under: Engineering Water > Engineering Water

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“…and Pseudanabaena sp. [50,67,81,[83][84][85]. SRTs of less than 8 days promote species of green algae such as Scenedesmus sp.…”

Section: -Other Operational Factorsmentioning

confidence: 99%

Production of polymers by cyanobacteria grown in wastewater: Current status, challenges and future perspectives

2020

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Cyanobacteria are prokaryotic oxygenic phototrophs receiving attention in a wide variety of technological applications such as food and feed supplements, and production of valuable polymers. Among these, carbohydrates (e.g. glycogen) and polyhydroxyalkanoates (PHAs) are of increasing interest due to their potential as a biofuel substrate and bioplastics, respectively. However, biofuels and bioplastics from cyanobacteria have seen many years of effort towards commercialization with only limited success. Their main limitation for polymer production is the high cost of the nutrient source; wastewater, as an inexpensive and widely available alternative, may overcome this bottleneck. Though cyanobacteria have demonstrated a capacity to treat wastewater effluents, their cultivation in such a variable environment involves certain challenges of which the chief one is linked to contamination by other species, especially green algae. This would represent a serious drawback during cyanobacterial biomass production and affects further PHA and carbohydrate production. The present study reviews the potential of cyanobacteria to grow in wastewater effluents from different sources. Conditions favoring them in mixed-culture reactors are described, focusing on nutritional and operational aspects. Current advances and future prospects in PHA and carbohydrate production are explored and discussed.

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Selection of cyanobacteria over green algae in a photo-sequencing batch bioreactor fed with wastewater

Cited by 34 publications

References 40 publications

Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Natural Pigments and Biogas Recovery from Microalgae Grown in Wastewater

Outdoor microalgae‐based urban wastewater treatment: Recent advances, applications, and future perspectives

Production of polymers by cyanobacteria grown in wastewater: Current status, challenges and future perspectives

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