Advanced microalgae-based renewable biohydrogen production systems: A review

Goswami, Rahul Kumar; Mehariya, Sanjeet; Obulisamy, Parthiba Karthikeyan; Verma, Pradeep

doi:10.1016/j.biortech.2020.124301

Cited by 124 publications

(50 citation statements)

References 108 publications

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“…The environmental and economic benefits are occurring by the conjugation of wastewater treatment process with microalgae cultivation for biofuel production. Several studies reported that the different types of wastewater have been successfully utilized for cultivation of different species of microalgae, which can substantially decrease the operational costs of wastewater treatment and biofuel production [3,26]. While during microalgae growth water and nutrients, light and CO 2 are necessary, among them, wastewater provides water and nutrients, while sunlight and atmospheric CO 2 can be used for cost effective cultivation [4].…”

Section: Wastewater Treatment Processesmentioning

confidence: 99%

“…For these reasons, the development of microalgal biorefineries could be effective for reducing the demand of fossil fuel and lowering greenhouse gas (GHG) emissions, which mitigates the problems associated with global warming and climate changes. Microalgal biomass is considered essential feedstock for biofuel production, because microalgae can be cultivated through the year with higher productivity [2][3][4][5]. Moreover, they are highly potential candidates for resource recovery from different types of nutrient-rich wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…In the first step, microalgae are cultivated in wastewater under aerobic conditions, while in the second step they are used for biofuel production under anaerobic conditions [13,[15][16][17]. Moreover, lipids can be extracted for biodiesel production from microalgal biomass [18], while the residual/leftover biomass can converted into different liquid and gases biofuel including bio-alcohols through fermentation [19], bio-H 2 through dark fermentation [3], and bio-CH 4 via anaerobic co-digestion [20,21]. Recent studies reported that algae technology has the potential to produce bioelectricity by a technology based on photosynthetic microbial fuel cells (PhotoMFC) [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Integrated Approach for Wastewater Treatment and Biofuel Production in Microalgae Biorefineries

et al. 2021

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The increasing world population generates huge amounts of wastewater as well as large energy demand. Additionally, fossil fuel’s combustion for energy production causes the emission of greenhouse gases (GHG) and other pollutants. Therefore, there is a strong need to find alternative green approaches for wastewater treatment and energy production. Microalgae biorefineries could represent an effective strategy to mitigate the above problems. Microalgae biorefineries are a sustainable alternative to conventional wastewater treatment processes, as they potentially allow wastewater to be treated at lower costs and with lower energy consumption. Furthermore, they provide an effective means to recover valuable compounds for biofuel production or other applications. This review focuses on the current scenario and future prospects of microalgae biorefineries aimed at combining wastewater treatment with biofuel production. First, the different microalgal cultivation systems are examined, and their main characteristics and limitations are discussed. Then, the technologies available for converting the biomass produced during wastewater treatment into biofuel are critically analyzed. Finally, current challenges and research directions for biofuel production and wastewater treatment through this approach are outlined.

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Section: Wastewater Treatment Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated Approach for Wastewater Treatment and Biofuel Production in Microalgae Biorefineries

et al. 2021

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“…Hydrogen is an energy carrier with a high calorific value of 122 kJ/g, which is about 2.75 folds than fossil fuels, and it is also an environmentally friendly molecule since it only gives water as a by-product of its combustion [62]. For this reason, hydrogen environmental damage ratio has been estimated as 1, compared to that of several hydrocarbon fuels about 20 times higher [8,63].…”

Section: Fuel Cellmentioning

confidence: 99%

“…For example, water electrolysis requires temperatures ranging from 20 • C to 100 • C [65], while thermochemical processes can reach 2000 • C [66]. Moreover, fossil thermochemical conversions release high amounts of CO 2 [62]. Theoretically, it could be possible to convert these technologies into green ones by pairing them to mechanism that prevent CO 2 releasing into the atmosphere.…”

Section: Fuel Cellmentioning

confidence: 99%

Biohydrogen from Microalgae: Production and Applications

et al. 2021

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The need to safeguard our planet by reducing carbon dioxide emissions has led to a significant development of research in the field of alternative energy sources. Hydrogen has proved to be the most promising molecule, as a fuel, due to its low environmental impact. Even if various methods already exist for producing hydrogen, most of them are not sustainable. Thus, research focuses on the biological sector, studying microalgae, and other microorganisms’ ability to produce this precious molecule in a natural way. In this review, we provide a description of the biochemical and molecular processes for the production of biohydrogen and give a general overview of one of the most interesting technologies in which hydrogen finds application for electricity production: fuel cells.

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Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

Sravan,

Hemalatha,

Mohan

2023

Advanced Sustainable Systems

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Single‐chambered electrofermentation (EF) bioreactors are operated using spent wash to evaluate the effect of applied voltage (EF/AV; −0.6 V) against closed‐circuit (EF/CC; 100 Ω) and control (EF/C; no voltage/resistance) operations using deoiled microalgae biomass‐derived biochar electrodes (anode) on increasing acidogenesis rate/efficiency. Higher total volatile fatty acids (VFA) production (mg L−1) is observed in EF/AV (2866), depicting 31% and 57% increments than EF/CC (1984) and EF/C (1224), respectively. The VFA profiles (C2–C4) in EF/AV are higher with acetic/butyric/propionic acids (1922/704/240 mg L−1) and biogas co‐generation [H2 (22%) and CH4 (3%)] than EF/CC and EF/C. The applied voltage (EF/AV) helps in electron flux regulation for increasing substrates conversion and VFA generation. Residual VFA‐rich effluents from EF process is utilized as substrate to mixotrophic microalgae cultivation (nutrient‐ and stress‐phase) that resulted in biomass production with simultaneous wastewater treatment. EF/AV depicted higher biomass growth (0.72 g L−1; 4th day) and substrate removal (63%) than other operations. Integrations of electrofermentation with photosynthetic processes operated with the residual resources in effluents towards product valorization and wastewater polishing, accounts for low‐carbon economy.

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Advanced microalgae-based renewable biohydrogen production systems: A review

Cited by 124 publications

References 108 publications

Integrated Approach for Wastewater Treatment and Biofuel Production in Microalgae Biorefineries

Integrated Approach for Wastewater Treatment and Biofuel Production in Microalgae Biorefineries

Biohydrogen from Microalgae: Production and Applications

Cascading Integration of Electrofermentation and Photosynthesis—Low‐Carbon Biorefinery in Closed Loop Approach

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