Bioelectrochemical systems using microalgae – A concise research update

Saratale, Ganesh Dattatraya; Kuppam, Chandrasekar; Mudhoo, Ackmez; Sivagurunathan, Periyasamy; Zhen, Guangyin; Koók, László; Bakonyi, Péter; Nemestóthy, Nándor; Kumar, Gopalakrishnan

doi:10.1016/j.chemosphere.2017.02.132

Cited by 96 publications

(16 citation statements)

References 87 publications

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“…Microalgae production in municipal wastewaters has been studied for energy production [108,109]. Microalgal lipidic profile, particularly the triacylglycerides (i.e., C14:0, C16:0, C16:1, C18:0, C18:2 and C18:3), through transesterferication have been shown to be suitable for biofuel production.…”

Section: Discussionmentioning

confidence: 99%

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Pacheco

Rocha

Garcia³

et al. 2021

Applied Sciences

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The need to reduce the costs associated with microalgae cultivation encouraged scientific research into coupling this process with wastewater treatment. Thus, the aim of this work was to assess the growth of Chlorella vulgaris (Chlorophyta) in different effluents from a municipal wastewater treatment plant (WWTP), namely secondary effluent (SE) and sludge run-off (SR). Assays were performed, under the same conditions, in triplicate with 4 dilution ratios of the wastewaters (25%, 50%, 75% and 100%) with the standard culture medium bold basal medium double nitrated (BBM2N) as a control. The capability of C. vulgaris for biomass production, chlorophyll synthesis and nutrients removal in the SE and SR was evaluated. The 25% SE and 25% SR showed increased specific growth rates (0.47 and 0.55 day−1, respectively) and higher biomass yields (8.64 × 107 and 1.95 × 107 cells/mL, respectively). Regarding the chlorophyll content, the 100% SR promoted the highest concentration of this pigment (2378 µg/L). This green microalga was also able to remove 94.8% of total phosphorus of SE, while in 50% SR, 31.2% was removed. Removal of 73.9% and 65.9% of total nitrogen in 50% and 100% SR, respectively, was also observed. C. vulgaris growth can, therefore, be maximized with the addition of municipal effluents, to optimize biomass production, while cleansing the effluents.

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Section: Discussionmentioning

confidence: 99%

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Pacheco

Rocha

Garcia³

et al. 2021

Applied Sciences

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“…All of these parameters can be analyzed in further studies to facilitate the main steps in microalgal production. New technologies are constantly being studied to optimize future processes; for example, bioelectrogenesis with microbial fuel cells (MFCs) consists of treating different types of wastewater and producing electrical energy, and microalgae can potentially be used in bioelectrochemical systems for power generation and removal of unwanted nutrients . These ideas are of great interest for the future development in processes with long‐term sustainability and environmental benefits.…”

Section: Future Trendsmentioning

confidence: 99%

Microalgae and Clean Technologies: A Review

Souza

Hoeltz

Benitez

et al. 2019

CLEAN Soil Air Water

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The search for clean technologies needs to be continued to offer alternatives for achieving sustainable energy production and a sustainable economy. This concern is particularly related to the demands of both producing enough renewable energy to meet future needs and reducing greenhouse gas (GHG) emissions. Microalgae are recognized for several benefits they offer, and in recent years, the use of life cycle assessment (LCA) to evaluate the benefits resulting from microalgae cultivation, harvesting/dewatering, biomass drying, extraction, and byproduct development has stimulated research in this area. Considering the importance of microalgae and clean technologies and the increasing number of publications on these subjects, this review aims to perform bibliometric mapping of such studies from 2008 to 2018. Web of Science and Scopus databases are used to identify leading trends. Visualization of similarities viewer (VOSviewer) software is applied to analyze the interactions among keywords. The results of this study indicate an association of microalgae and clean technologies and demonstrate that LCA is one of the most common tools used for such analyses. Bibliometric mapping provides relevant data to reinforce this association and understand the main bottlenecks that must be overcome in this field for future progress to be made.

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“…After extraction of lipids from microalgal biomass to produce biodiesel, the residual biomass can be fermented in two steps to produce hydrogen and methane, so-called bio-hythane [11]. Moreover, the application of microalgae in microbial fuel cells, producing electricity, is being explored [12].…”

Section: Introductionmentioning

confidence: 99%

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

et al. 2021

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The interest in microalgae products has been increasing, and therefore the cultivation industry is growing steadily. To reduce the environmental impact and production costs arising from nutrients, research needs to find alternatives to the currently used artificial nutrients. Microalgae cultivation in anaerobic effluents (more specifically, digestate) represents a promising strategy for increasing sustainability and obtaining valuable products. However, digestate must be processed prior to its use as nutrient source. Depending on its composition, different methods are suitable for removing solids (e.g., centrifugation) and adjusting nutrient concentrations and ratios (e.g., dilution, ammonia stripping). Moreover, the resulting cultivation medium must be light-permeable. Various studies show that growth rates comparable to those in artificial media can be achieved when proper digestate treatment is used. The necessary steps for obtaining a suitable cultivation medium also depend on the microalgae species to be cultivated. Concerning the application of the biomass, legal aspects and impurities originating from digestate must be considered. Furthermore, microalgae species and their application fields are essential criteria when selecting downstream processing methods (harvest, disintegration, dehydration, product purification). Microalgae grown on digestate can be used to produce various products (e.g., bioenergy, animal feed, bioplastics, and biofertilizers). This review gives insight into the origin and composition of digestate, processing options to meet requirements for microalgae cultivation and challenges regarding downstream processing and products.

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Bioelectrochemical systems using microalgae – A concise research update

Cited by 96 publications

References 87 publications

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Microalgae and Clean Technologies: A Review

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

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