Utilization of centrate for the outdoor production of marine microalgae at pilot-scale in flat-panel photobioreactors

Romero-Villegas, Gabriel I.; Fiamengo, M.; Fernández, Francisco Gabriel Acién; Grima, E. Molina

doi:10.1016/j.jbiotec.2018.08.006

Cited by 28 publications

(11 citation statements)

References 49 publications

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“…While tubular PBRs showed 5 different species (Romero Villegas et al, 2017), flat-panels PBRs exhibited only two strains (Nannochloropsis g. and Geitlerinema sp.) (Romero- Villegas et al, 2018), whereas previous studies showed that monocultures of Nannochloropsis g. (Ledda et al, 2015) and Scenedesmus sp. (Morales-Amaral et al, 2015) could be obtained using wastewater in raceway PBRs.…”

Section: Microalgae Population Strainsmentioning

confidence: 84%

Utilization of centrate for the outdoor production of marine microalgae at the pilot-scale in raceway photobioreactors

Romero-Villegas

Fiamengo

Acién-Fernández

et al. 2018

Journal of Environmental Management

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In this study, the outdoor production of marine microalgae in raceway photobioreactors was investigated, modifying the centrate percentage in the culture medium (20, 30, 40 and 50%) and using two different dilution rates (0.2 day −1 and 0.3 day −1). The data obtained showed that microalgae are capable of producing biomass in addition to recovering the nutrients contained in the centrate. The best results for biomass productivity and light efficiency were obtained when the centrate was set at 20% with a dilution rate of 0.3 day −1. The biomass productivity was 32.42 g m −2 •day −1 while the photosynthetic efficiency was 0.74 g biomass •E −1 (3.66%). Regarding the nutrients, nitrogen (the majority being in the form of ammonium [NH 4 + ]) and phosphorus were only fixed into biomass when optimal conditions were set; if this was not the case, they were lost to stripping or precipitation. The maximal nutrient removal capacities under the optimal conditions were 28.72 mg N •l −1 •day −1 and 3.99 mg P •l −1 •day −1. Population changes were determined by the dilution rate set whilst the centrate percentage had little effect. Four strains were present in the culture, Nannochloropsis g. being the main one. Biochemical changes did not vary greatly between the conditions set for the culture, with a composition rich in proteins and carbohydrates being observed. One can conclude that to produce marine microalgal biomass for a range of potential commodities such as feed, biofertilizers and biofuels, it is possible to use centrate from anaerobic digestion as the sole nutrient source, as a way of reducing costs.

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Section: Microalgae Population Strainsmentioning

confidence: 84%

Utilization of centrate for the outdoor production of marine microalgae at the pilot-scale in raceway photobioreactors

Romero-Villegas

Fiamengo

Acién-Fernández

et al. 2018

Journal of Environmental Management

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“…In another study, microalgae were cultivated in controlled media to simulate the synthetic wastewater and the single-stage culture systems. The study showed a production rate of 132.8 mg/day for biomass (15).…”

Section: Introductionmentioning

confidence: 90%

Efficiency of Microalgae Scenedesmus in the Removal of Nitrogen from Municipal Wastewaters

Yengejeh

Ghaeni

2019

IJT

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Background: Due to the high content of nitrogen in the municipal wastewaters, this study evaluated the efficiency of Scenedesmus as an important microalgae in the removal of nitrate from wastewaters and its application as an appropriate culture medium. As algae have high resistance to temperature and pH changes, they can absorb low concentrations of nutrients and need simple low-cost technology. Through photosynthesis, microalgae effectively stabilize carbon dioxide at a low cost, and the oxygen produced by the photosynthesis process can reduce the biochemical oxygen demand (BOD) of wastewaters. Methods: In this research, the chemical oxygen demand (COD), BOD, pH, total nitrogen (TN), and microalgae density were measured in the samples within 14 days after sampling from the inlet and outlet of municipal wastewaters treatment plant. Results: The results showed that nitrogen removal rate from the wastewaters at the laboratory conditions was 93% in the inlet and 85% in the outlet, which are higher in efficiency than those provided by other treatment processes. Conclusion: The microalgae can be used for the removal of nitrate and the production of algae biomass in municipal wastewaters processes before entering the natural environment.

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“…Regarding PBRs, north–south orientation has been reported to be more favorable for latitudes over 35°N, while closer to the equator, the east–west orientation contributes to increasing the photosynthetic rate due to higher solar radiation (Romero‐Villegas, Fiamengo, Acién Fernández, & Molina Grima, 2018).…”

Section: Microalgae Cultivationmentioning

confidence: 99%

“…There are two main ways to operate microalgae‐based wastewater treatment systems: without biomass retention. In this case, HRT is equal to SRT (Galès et al, 2019; Romero‐Villegas, Fiamengo, Acién Fernández, & Molina Grima, 2018). Since microalgae usually present lower growth rates than bacteria, that is, in the range of 0.4–0.9 days −1 (Pachés et al, 2020; Ruiz et al, 2013), relatively long HRTs are needed to avoid microalgae washout: 3.3–10 days (Arbib et al, 2017; González‐Camejo, Jiménez‐Benítez, et al, 2019a).…”

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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Utilization of centrate for the outdoor production of marine microalgae at pilot-scale in flat-panel photobioreactors

Cited by 28 publications

References 49 publications

Utilization of centrate for the outdoor production of marine microalgae at the pilot-scale in raceway photobioreactors

Utilization of centrate for the outdoor production of marine microalgae at the pilot-scale in raceway photobioreactors

Efficiency of Microalgae Scenedesmus in the Removal of Nitrogen from Municipal Wastewaters

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

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