Microbial communities for valorizing biomass using the carboxylate platform to produce volatile fatty acids: A review

Holtzapple, Mark T.; Wu, Haoran; Weimer, Paul J.; Dalke, Rachel; Granda, Cesar B.; Mai, Jesse; Urgun‐Demirtas, Meltem

doi:10.1016/j.biortech.2021.126253

Cited by 58 publications

(57 citation statements)

References 76 publications

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“…Anaerobic fermentation enables the production of carboxylates from cheap organic matter. The technology uses microbial communities as robust and self-regenerating biocatalysts to produce a spectrum of carboxylates with one to eight carbon atoms in their chain [1, 2]. Anaerobic fermentation is basically a methane-arrested anaerobic digestion [1], hence, it can take profit from the existing infrastructure and knowledge about anaerobic digestion while producing chemicals that are more valuable and energy-dense than biogas [3].…”

Section: Introductionmentioning

confidence: 99%

“…The technology uses microbial communities as robust and self-regenerating biocatalysts to produce a spectrum of carboxylates with one to eight carbon atoms in their chain [1, 2]. Anaerobic fermentation is basically a methane-arrested anaerobic digestion [1], hence, it can take profit from the existing infrastructure and knowledge about anaerobic digestion while producing chemicals that are more valuable and energy-dense than biogas [3]. Carboxylates, in particular those with longer carbon chains, can be extracted from fermentation broths with relative ease [4] and hold promise as a bio-based platform for the chemical and fuel industry [5].…”

Section: Introductionmentioning

confidence: 99%

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Formate-induced CO tolerance and innovative methanogenesis inhibition in co-fermentation of syngas and plant biomass for carboxylate production

Baleeiro

Varchmin

Kleinsteuber

et al. 2022

Preprint

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Production of monocarboxylates using microbial communities is highly dependent on local and degradable biomass feedstocks. Syngas or different mixtures of H2, CO, and CO2 can be co-fed to a fermenter to alleviate this dependence. To understand the effects of adding these gases during anaerobic fermentation of plant biomass, a series of batch experiments was carried out with different syngas compositions and corn silage (pH 6.0, 32°C). Co-fermentation of syngas with corn silage increased the overall carboxylate yield per gram of volatile solids (VS) by up to 44% (0.36 ± 0.07 g gVS-1; in comparison to 0.23 ± 0.04 g gVS-1 with a N2/CO2 headspace), despite slowing down biomass degradation. Ethylene and CO exerted a synergistic effect in preventing methanogenesis, leading to net carbon fixation. Less than 12% of the electrons were misrouted to CH4 when either 15 kPa CO or 5 kPa CO + 1.5 kPa ethylene was used. CO increased the selectivity to acetate and propionate, which accounted for 86% (electron equivalents) of all products at 49 kPa CO, by favoring lactic acid bacteria and actinobacteria over n-butyrate and n-caproate producers. This happened even when an inoculum pre-acclimatized to syngas and lactate was used. Intriguingly, the effect of CO on n-butyrate and n-caproate production was reversed when formate was present in the broth. The concept of co-fermenting syngas and plant biomass shows promise in two aspects: by making anaerobic fermentation a carbon-fixing process and by increasing the production of propionate and acetate. Testing the concept in a continuous process could improve selectivity to n-butyrate and n-caproate by enriching chain-elongating bacteria adapted to CO and complex biomass.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formate-induced CO tolerance and innovative methanogenesis inhibition in co-fermentation of syngas and plant biomass for carboxylate production

Baleeiro

Varchmin

Kleinsteuber

et al. 2022

Preprint

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“…A leading option for converting lignocellulose to liquid hydrocarbon fuels is the carboxylate platform [ 3 – 5 ]. In this approach, biomass is biologically converted to carboxylate salts, which are then chemically converted to liquid hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Conversion of acetone and mixed ketones to hydrocarbons using HZSM-5 catalyst in the carboxylate platform

Taco-Vasquez

Holtzapple

2022

PLoS ONE

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In this study, two different feeds were treated to produce hydrocarbons: (1) reagent-grade acetone, and (2) mixed ketones obtained from lignocellulosic biomass via the carboxylate platform. Acetone and mixed ketones underwent catalytic self-condensation over HZSM-5. For acetone, HZSM-5(80) was used, and the experiments were conducted in two sets: (1) vary temperature (305–415°C) at P = 101 kPa (abs) and weight hourly space velocity (WHSV) = 1.3 h–1; (2) vary WHSV (1.3–7.9 h–1) at T = 350 and 415°C, and P = 101 kPa (abs). For acetone over HZSM-5(280), the experiments were conducted in two sets: (1) vary WHSV (1.3–6.5 h–1) at T = 415°C, and P = 101 kPa (abs); and (2) vary WHSV (1.3–11.8 h–1) at P = 790 kPa (abs) and T = 415°C. For mixed ketones, HZSM-5(280) was used at WHSV = 1.9 h–1, T = 430–590°C, and P = 101 kPa (abs). For acetone at higher temperatures, the conversion was 100% and the liquid products were aromatics centered on C8. At low temperatures, conversion was less and the carbon liquid distribution was centered on C9 (mainly mesitylene). For mixed ketones, catalyst deactivation was higher causing product concentrations to change over time, and the highest conversion reached was 40%.

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“…However, the sugar platform requires expensive enzymes and is better suited for feedstocks with a more homogeneous composition. Conversion of heterogeneous mixtures such as food waste through the sugar platform is costly and results in low product yields (Holtzapple et al, 2022). which can be distilled at atmospheric pressure (Agler et al, 2011;Lee et al, 2014).…”

Section: Carboxylate Platform For Resource Recovery From Food Wastementioning

confidence: 99%

“…Analogous to a petrochemical refinery where fossil fuels are converted to different materials and energy, a biorefinery refers to the production of bioenergy, biochemicals, and biofuels from various biomass sources (Coma et al, 2017;Igbokwe et al, 2022;Bhatt et al, 2020). The typical biorefinery platforms include the sugar and synthesis gas platform (Holtzapple et al, 2022;Molina-Peñate et al, 2022). Recently, a new platform, the carboxylate platform has been introduced into the biorefinery platform and has the lowest capital costs amongst the various platforms Jones et al, 2021;Atasoy et al, 2018;Ramos-Suarez et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Acidogenic Fermentation of Food Waste in a Leachate Bed Reactor at High Organic Loading: Effect of Granular Activated Carbon (GAC) and Inoculum

Radadiya¹

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Food waste forms a major fraction of municipal solid waste worldwide, constituting 15-30% of municipal solid waste. If the post-harvest losses are included, the global food waste generation exceeds 1.3 billion tons a year, with economic losses exceeding $1 trillion.Landfilling is the primary method of food waste disposal in most countries, resulting in the loss of a valuable resource (food waste) and causing adverse health and environmental effects such as greenhouse gas emissions, pollution of the subsurface environment, and loss of habitat. To ensure environmental and public health, sustainable and cost-effective approaches for food waste stabilization are being intensively researched. Technologies that can stabilize and transform food waste into valuable products present a tangible solution to this challenge. Acidogenic fermentation is emerging biotechnology that transforms food waste to high-value biochemicals such as short-chain fatty acids (SCFAs); thereby combining sustainable management of food waste with resource recovery. Dry fermenters iii AcknowledgmentFirstly, I would like to thank my supervisor, Dr. Abid Hussain, for giving me the opportunity to work on this research project, and for his endless support, guidance, and patience throughout the research project. I am genuinely grateful for his availability around the clock during all the challenges in research work. Your meticulous planning, constructive criticism, and relentless pursuit of perfection were not only important to the successful completion of this research project, but also to the development of my knowledge and skills.I would also like to extend my gratitude to Dr. Marie Tudoret and Dr. Muhammad Salam for helping me in the setup of my reactor, ordering the supplies, and many moreit would not have been possible without your assistance. I am also thankful to Richard Kibbee and Dr. Jianqun Wang for their technical guidance.Many thanks to Shreya and Sunny for their constant motivational and moral support. I am also thankful to Nupur, Jaydeep, Tushar, Hiren, and other friends for making me feel relaxed during the tough times. I am grateful to my parents, Nandlal and Jigna, and my brother Priyansh for their never-ending love, care, and understanding.

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Microbial communities for valorizing biomass using the carboxylate platform to produce volatile fatty acids: A review

Cited by 58 publications

References 76 publications

Formate-induced CO tolerance and innovative methanogenesis inhibition in co-fermentation of syngas and plant biomass for carboxylate production

Formate-induced CO tolerance and innovative methanogenesis inhibition in co-fermentation of syngas and plant biomass for carboxylate production

Conversion of acetone and mixed ketones to hydrocarbons using HZSM-5 catalyst in the carboxylate platform

Acidogenic Fermentation of Food Waste in a Leachate Bed Reactor at High Organic Loading: Effect of Granular Activated Carbon (GAC) and Inoculum

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