The challenges of monitoring and manipulating anaerobic microbial communities

Innard, Nathan; Chong, James P. J.

doi:10.1016/j.biortech.2021.126326

Cited by 7 publications

(3 citation statements)

References 125 publications

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“…This opti-mization could be done through different strategies, including, for example, by increasing the recovery of organic compounds in the liquid fraction during the screw press, improving the UASB digester design, increasing the initial COD of the feed, adding a pre-hydrolysis step before the UASB [22] and enhancing biomass granulation with chemical additives [38]. In the future, the implementation of novel in-line monitoring and control strategies to maximize the OLR without perturbating the microbial community could also potentially improve the performance of the process [39]. The effect of the TAN concentration on the conversion of FVW in a UASB digester would also need to be addressed.…”

Section: Comparison Of the Strategies For Converting Fruit And Vegeta...mentioning

confidence: 99%

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

Tanguay-Rioux,

Spreutels,

Roy

et al. 2023

Bioengineering

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Anaerobic digestion of food waste still faces important challenges despite its world-wide application. An important fraction of food waste is composed of organic material having a low hydrolysis rate and which is often not degraded in digesters. The addition of this less hydrolysable fraction into anaerobic digesters requires a longer hydraulic residence time, and therefore leads to oversizing of the digesters. To overcome this problem, the conversion of the highly biodegradable liquid fraction from fruit and vegetable waste in a up-flow anaerobic sludge blanket (UASB) digester is proposed and demonstrated. The more easily biodegradable fraction of the waste is concentrated in the liquid phase using a 2-stage screw press separation. Then, this liquid fraction is digested in a 3.5 L UASB digester at a high organic loading rate. A good and stable performance was observed up to an organic loading rate (OLR) of 12 g COD/(Lrx.d), with a specific methane production of 2.6 L CH4/(Lrx.d) and a degradation of 85% of the initial total COD. Compared to the conversion of the same initial waste with a continuously stirred tank reactor (CSTR), this new treatment strategy leads to 10% lower COD degradation, but can produce the same amount of methane with a digester that is twice as small. The scale-up of this process could contribute to reduced costs related to the anaerobic digestion of food waste, while reducing management efforts associated with digestate handling and increasing process stability at high organic loading rates.

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Section: Comparison Of the Strategies For Converting Fruit And Vegeta...mentioning

confidence: 99%

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

Tanguay-Rioux,

Spreutels,

Roy

et al. 2023

Bioengineering

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“…Mixed anaerobic microbial communities signi cantly affect the valorization of waste biomass via the process of anaerobic digestion (Innard & Chong, 2022). As shown in Fig.…”

Section: Microbial Abundance At Phylum Levelmentioning

confidence: 99%

The Pungency Impact of 6-Gingerol on the Methane Generation from Food Waste by Anaerobic Digestion: Batch and Two Stages Performance

Xue

Zhou²,

Huang

et al. 2022

SSRN Journal

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“…Regarding the use of community GEMs, being able to monitor different microbial populations and quantifying their relative ratios in the community can improve the quality and applicability of the models. Techniques like FISH (fluorescence in-situ hybridization), qPCR (quantitative PCR), FAST (fluorescence-activated cell sorting), microscopy, and others have been employed for monitoring cell populations, and have recently been applied in syngas fermentation and chain elongation studies (Bäumler et al, 2023;Innard & Chong, 2022;Robles et al, 2023;Schneider et al, 2021).…”

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confidence: 99%

Synthetic microbial communities for syngas-driven odd-chain elongation

Parera Olm

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The last century has seen an unprecedented rise in carbon dioxide (CO 2 ) emissions into the atmosphere, causing average global temperatures to rise to levels never seen before (Intergovernmental Panel on Climate Change [IPCC], 2018[IPCC], , 2023. Human activities with a large environmental footprint such as burning fossil fuels, deforestation, and industrial processes have contributed to this increase. The rise in CO 2 emissions is recognized as a major driver of climate change, which has already resulted in profound societal and environmental impacts. Among others, these include rising sea levels, intensified heatwaves, diminished rainforests, heightened risks of species extinction, and compromised food security. Unfortunately, current projections indicate that the emission reduction commitments outlined by countries under the 2015 Paris Climate Agreement (United Nations Framework Convention on Climate Change, 2015) are unlikely to be fulfilled (Climate Action Tracker).Considering the projected growth of the human population in the next decades (United Nations Department of Economic and Social Affairs, Population Division, 2022), it is expected that, if no actions are taken, the future scenario regarding climate change will worsen, although it is important to note that anthropogenic emissions alone are not the sole contributor (IPCC, 2018(IPCC, , 2023. Natural climate fluctuations and geological events also play a role in climate change. Nevertheless, population growth is a factor that strongly influences the demand for resources and energy consumption, making anthropogenic emissions a key factor in the equation. It is widely recognized that humanity is exceeding the planet's ecological limits (Global Footprint Network). This concept is often referred to as ecological overshoot, where human demand for resources and ecological services exceeds the regenerative capacity of Earth.It is therefore crucial to implement sustainable practices across all sectors (IPCC, 2023). These include transitioning to cleaner energy sources, improving forest-and crop-land management, and reducing food waste, all attainable strategies that should be incentivised and supported with effective policies. In this thesis, we address one of these necessary practices: the sustainable production of chemicals.11 General introduction and Thesis outline The syngas fermentation era and the rise of acetogensRecent years have witnessed a growing interest on C1 feedstocks (i.e., syngas, methanol, formate) for microbial conversion to biochemicals. This approach holds promise in reducing reliance on fossil fuels and minimizing carbon emissions. Furthermore, advancements in biotechnology and microbial engineering have expanded our understanding of C1 utilization pathways, paving the way for innovative approaches in converting these feedstocks into valuable chemicals (

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The challenges of monitoring and manipulating anaerobic microbial communities

Cited by 7 publications

References 125 publications

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

The Pungency Impact of 6-Gingerol on the Methane Generation from Food Waste by Anaerobic Digestion: Batch and Two Stages Performance

Synthetic microbial communities for syngas-driven odd-chain elongation

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