Regulate oxygen concentration using a co-culture of activated sludge bacteria and Chlorella vulgaris to maximize biophotolytic hydrogen production

Javed, Muhammad Asad; Zafar, Abdul Mannan; Hassan, Ashraf Aly

doi:10.1016/j.algal.2022.102649

Cited by 30 publications

(14 citation statements)

References 39 publications

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“…12 However, using waste resources such as activated sludge as a source of bacteria has also shown a signicant enhancement in bioH 2 . 3,13 Thus, Chlorella vulgaris has been observed to have a higher biodegradation ability than in the earlier studies with a high conversion efficiency of 50%. 14 A low conversion efficiency of 30% has also been reported for digestion by Scenedesmus obliquus.…”

Section: Introductionmentioning

confidence: 80%

“…1 At present, a sustainable goal is lowcost biological hydrogen gas (bioH 2 ) production using microalgae as a feedstock (dry biomass) or as photosynthetic microorganisms (living culture). 2,3 Hydrogen (H 2 ) has a high energy content and as a biofuel it does not emit carbon dioxide (CO 2 ). 4 On the other hand, biomethane contributes toward greenhouse gas (GHG) emissions.…”

Section: Introductionmentioning

confidence: 99%

“…16 The bioH 2 production through batch reactors suffers from a variety of inhibitory elements during anaerobic digestion, such as the accumulation of volatile fatty acids (VFAs) in the medium, low pH at the end of incubation, degradation of microalgal cells, reduction in the amount of chlorophyll, and reduced consumption of carbon substrates. 3 These factors reduce the efficiency of AD metabolism and result in the ceasing of bioH 2 production aer a few days. Compared to bioH 2 generation through batch reactors, bioH 2 yield through continuous or sequential reactors is much more effective in reducing the inhibitory factors and sustaining the bioH 2 production for a more extended period, and is less laborious in terms of medium replacement.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photo fermentative biohydrogen production potential using microalgae–activated sludge co-digestion in a sequential flow batch reactor (SFBR)

Javed

Hassan

2022

RSC Adv.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photo fermentative biohydrogen production potential using microalgae–activated sludge co-digestion in a sequential flow batch reactor (SFBR)

Javed

Hassan

2022

RSC Adv.

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“…Each ratio including control was performed in duplicates. The H 2 production and O 2 content data with glucose as the carbon substrate was taken from the previous study . In addition to this, the co-cultures with sorbitol and mannitol supplementation, as presented in this study, were exclusively evaluated further for specific H 2 yield, acetate, chlorophyll, ATP, and total organic carbon (TOC) concentration.…”

Section: Methodsmentioning

confidence: 99%

Exogenous Carbon Substrates for Biohydrogen Production and Organics Removal Using Microalgal-Bacterial Co-Culture

Javed

Zafar

Al‐Zuhair

et al. 2022

ACS Sustainable Chem. Eng.

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The co-culture of microalgae and bacteria is the most effective and appropriate pathway for synergetic H 2 production using photofermentative and biophotolytic metabolic pathways. The integration of wastewater activated sludge as a waste resource in co-culture acts as a bacterial partner. This study assessed the co-culture of Chlorella vulgaris and real wastewater activated sludge with different carbon substrates for the improvement of H 2 production and simultaneous organics removal. Three different inoculum ratios of 1.5:1, 1:1, and 1:1.5 v/v (microalgae/activated sludge) were used with glucose, sorbitol, and mannitol at 10 g/L as exogenous carbon substrates. A high-value activated sludge of 15.1 g chemical oxygen demand (COD)/L was used as the bacterial source. The highest H 2 production of 1246 mL/L was observed in 1:1.5 v/v inoculum ratio using glucose, followed by 831 and 340 mL/L in co-cultures with sorbitol and mannitol addition, respectively. The inoculum ratio of 1:1.5 v/v also achieved ∼33% COD and ∼47% TS removal efficiencies in O 2 -deficient tris-acetate-phosphate (TAP) medium. This study demonstrated, based on experimental data, that the model glucose supplementation was hierarchically the most appropriate carbon substrate for a higher H 2 yield and substantial organics removal in co-culture. A lower H 2 yield is expected when decomposing actual food waste containing different sugars and complex organics.

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“…In 2012, researches performed by the US Department of Energy in the Pacific Northwest Laboratory found a bacterium called cyanothece that is capable of producing both hydrogen and oxygen for 100 h uninterrupted, 139 supposing a great improvement to previous technologies. Recent studies distinguish Na 2 SO 3 as oxygen scavenger, and enhanced production with Chlorella vulgaris and Chlamydomonas reinhardtii 140‐145 …”

Section: Sun Heat and Electricity For Water Splitting‐based Hydrogen ...mentioning

confidence: 99%

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

Mancera

Segura

Andújar

et al. 2022

Intl J of Energy Research

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Summary Water‐based hydrogen production is currently an attractive research field, as it provides a greener method to produce hydrogen than existing alternatives. Green hydrogen is expected to progressively replace fossil fuels, which are highly harmful environmentally. This paper presents a critical analysis over time of the main water splitting technologies currently in use for sustainable hydrogen production. As a result of the critical analysis, all the studied techniques have been ordered chronologically in the way that it is possible to understand how new materials have driven to new techniques, more efficient and less expensive. This allows having a complete vision of these technologies. A high level of maturity has been reached in electrolysis, while other techniques still have a long way to go, although many improvements and relevant advancements have been made over the years. The paper offers a global and comparative vision of each technology. From this, it is possible to identify the different paths where efforts are needed to make water‐based hydrogen production a mature, stable and efficient technology.

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Regulate oxygen concentration using a co-culture of activated sludge bacteria and Chlorella vulgaris to maximize biophotolytic hydrogen production

Cited by 30 publications

References 39 publications

Photo fermentative biohydrogen production potential using microalgae–activated sludge co-digestion in a sequential flow batch reactor (SFBR)

Photo fermentative biohydrogen production potential using microalgae–activated sludge co-digestion in a sequential flow batch reactor (SFBR)

Exogenous Carbon Substrates for Biohydrogen Production and Organics Removal Using Microalgal-Bacterial Co-Culture

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

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