Bio-Based Processes for Material and Energy Production from Waste Streams under Acidic Conditions

Cetecioglu, Zeynep; Atasoy, Merve; Cenian, Adam; Sołowski, Gaweł; Trček, Janja; Uğurlu, Ayşenur; Sedláková-Kaduková, Jana

doi:10.3390/fermentation8030115

Cited by 8 publications

(5 citation statements)

References 114 publications

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“…For instance, during the dark fermentation of 4% and 6% SCG medium-containing reactors, the pH dropped by 4.5 after the first day of fermentation, but interestingly, on the sixth and seventh days of fermentation, an increase in the pH to ~5.2 was observed, which consequently resulted in a hydrogen generation, especially in the 6% SCG-containing reactors, of ~1.2 dm 3 kg V.S −1 (Figure 4b). This fact once again underscores the importance of pH management for the optimal production and high yield of H 2 [39].…”

Section: The Effect Of Pretreatment On Biogas and Biohydrogen Productionmentioning

confidence: 78%

Biogas and Biohydrogen Production Using Spent Coffee Grounds and Alcohol Production Waste

2022

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In this study, alternative uses for lignocellulosic waste by considering them a source of eco-friendly and renewable energy generation with the application of the anaerobic digestion of treated and untreated waste for biogas and biohydrogen generation were investigated. The diluted sulfuric acid method was used for both the substrates and inoculum. Hydrogen production was absent when untreated spent coffee grounds (SCG) and alcohol waste (AW) were both used with the inoculum at pH 5.5 and pH 7.5. Meanwhile, the highest biogas yield of 320 dm3 kg V.S−1 was obtained when using AW at pH 7.5, with a 190 dm3 kg V.S−1 yield of methane. Instead, hydrogen production was observed when initially 4% (w/v) and 6% (w/v) SCG-containing hydrolysates were used as the substrates at pH 5.5, yielding 2.9 ± 0.09 dm3 kg V.S−1 and 3.85 ± 0.12 dm3 kg V.S−1, respectively. The further optimization of pretreatment technologies and pH control could lead to increased and prolonged hydrogen production.

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Section: The Effect Of Pretreatment On Biogas and Biohydrogen Productionmentioning

confidence: 78%

Biogas and Biohydrogen Production Using Spent Coffee Grounds and Alcohol Production Waste

2022

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“…The pH value has tendency to evolve (i.e. acidify) during fermentation, but its control and stabilization as well as process microaeration showed increased H 2 yield (Cetecioglu et al 2022 ).…”

Section: Production Of Fuels Under Low Ph Conditionsmentioning

confidence: 99%

“…In order to make the process of biohydrogen production technically and economically feasible one needs to overcome several barriers and challenges which include: (i) the choice of inoculum and its pretreatment (stressing) in order to eliminate hydrogen consuming bacteria; (ii) the choice of substrate and suitable pretreatment methods (they vary for different substrates); (iii) lack of trace elements, especially iron and nickel, essential for hydrogenases (including (Fe), (NiFe)-, and (NiFeSe)-hydrogenase); (iv) high hydrogen partial pressure, which results in the reduction of oxidized ferredoxin, thus hindering hydrogen production; (v) scale-up methods—however, there are cases (still rare) of full-scale installation for biomethane, e.g. Ignaciuk and Ignaciuk (2018 ), Cetecioglu et al ( 2022 ); and (vi) low hydrogen yield (and inhibition caused by by-products, e.g. acetate, butyrate, and propionate).…”

Section: Production Of Fuels Under Low Ph Conditionsmentioning

confidence: 99%

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Exploitation of microbial activities at low pH to enhance planetary health

Atasoy,

Álvarez Ordóñez,

Cenian

et al. 2023

FEMS Microbiology Reviews

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Awareness is growing that human health cannot be considered in isolation but is inextricably woven with the health of the environment in which we live. It is however under-recognised that the sustainability of human activities strongly relies on preserving the equilibrium of the microbial communities living in/on/around us. Microbial metabolic activities are instrumental for production, functionalization, processing and preservation of food. For circular economy, microbial metabolism would be exploited to produce building blocks for the chemical industry, to achieve effective crop protection, agri-food waste revalorization or biofuel production, as well as in bioremediation and bioaugmentation of contaminated areas. Low pH is undoubtedly a key physical-chemical parameter that needs to be considered for exploiting the powerful microbial metabolic arsenal. Deviation from optimal pH conditions has profound effects on shaping the microbial communities responsible for carrying out essential processes. Furthermore, novel strategies to combat contaminations and infections by pathogens rely on microbial-derived acidic molecules that suppress/inhibit their growth. Herein, we present the state-of-the-art of the knowledge on the impact of acidic pH in many applied areas and how this knowledge can guide us to use the immense arsenal of microbial metabolic activities for their more impactful exploitation in a Planetary Health perspective.

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“…There is a need for development of alternative methods of organic waste transformation into commercially profitable products, such as lipids, biomass, organic acids, biomethane, biohydrogen and others [3,4]. Recently, it was indicated that the little-known waste EAF is an excellent substrate with which to produce isocitric acid using the yeast Yarrowia lipolytica [5].…”

Section: Introductionmentioning

confidence: 99%

Selection of Producer of α-Ketoglutaric Acid from Ethanol-Containing Wastes and Impact of Cultivation Conditions

Kamzolova

Morgunov

2022

Fermentation

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Ester–aldehyde fraction (EAF) is a by-product of ethyl-alcohol-producing companies whose purification requires an expensive process. The results of this study illustrate the environmentally friendly and alternative possibility of using EAF to increase their value as substrate to produce α-ketoglutaric acid (KGA) using different yeasts. It was found that some species of the genera Babjeviella, Diutina, Moesziomyces, Pichia, Saturnispora, Sugiyamaella, Yarrowia and Zygoascus grown under thiamine deficiency accumulate KGA in the medium with an EAF as the sole carbon source. The strain Y. lipolytica VKM Y-2412 was selected as the producer. To reach the maximum production of KGA, the cultivation medium should contain 0.3 µg/L thiamine during cultivation in flasks and 2 µg/L in the fermentor; the concentration of (NH4)2SO4 should range from 3 to 6 g/L; and the optimal concentrations of Zn2+, Fe2+ and Cu2+ ions should be 1.2, 0.6 and 0.05 mg/L, respectively. EAF concentration should not exceed 1.5 g/L in the growth phase and 3 g/L in the KGA synthesis phase. At higher EAF concentrations, acetic acid was accumulated and inhibited yeast growth and KGA production. Under optimal conditions, the producer accumulated 53.8 g/L KGA with a yield (Yp/s) of 0.68 g/g substrate consumed.

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Bio-Based Processes for Material and Energy Production from Waste Streams under Acidic Conditions

Cited by 8 publications

References 114 publications

Biogas and Biohydrogen Production Using Spent Coffee Grounds and Alcohol Production Waste

Biogas and Biohydrogen Production Using Spent Coffee Grounds and Alcohol Production Waste

Exploitation of microbial activities at low pH to enhance planetary health

Selection of Producer of α-Ketoglutaric Acid from Ethanol-Containing Wastes and Impact of Cultivation Conditions

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