Methanogenic pathway and microbial succession during start-up and stabilization of thermophilic food waste anaerobic digestion with biochar

Lim, Ee Yang; Tian, Hailin; Chen, Yangyang; Ni, Kewei; Zhang, Jingxin; Tong, Yen Wah

doi:10.1016/j.biortech.2020.123751

Cited by 95 publications

(23 citation statements)

References 45 publications

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“…Such structures arise in biochars produced at high pyrolysis temperatures exceeding 700°C while those produced at lower temperatures have amorphous structures. This was supported by a recent study on biochar-amended AD conducted by LIM et al (2020), who found that the addition of 5-10 g/L of biochar produced from gasification of wood chips at 800 °C promoted the growth of electroactive Clostridia class and other electroactive bacteria. Clostridia, belonging to the phylum Firmicutes, are key microorganisms in anaerobic fermentation and the enriched homoacetogenic Clostridia are critical for elevated efficiency of syntrophic acetic acid oxidation to methane (Shin et al, 2019;WESTERHOLM et al, 2016).…”

Section: Modifications Of Molecular Structure Of Biochar and Their Impact On Microbial Interactions For Improved Ad Performancementioning

confidence: 54%

Syntrophic interactions in anaerobic digestion: how biochar properties affect them?

Johnravindar

Patria

Lee

et al. 2021

Sustainable Environment

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Biochar as a biomass derived, low cost, carbon conductive material is considered as an important supplement in the anaerobic digestion (AD) of organic matter. It functions as an electrical grid to allow direct electron transfer from fatty acid oxidizers to methanogenic archaea, thereby promoting syntophy between various microbial groups and leading to efficient methanogenesis. Specific properties of biochar play an important role in promoting syntrophic interactions in AD. As a physical indicator, surface area, porosity, particle size and surface texture of biochar play an important role in governing microbial attachment and enrichment on biochar. This influences the microbial degradation of fatty acids and their subsequent conversion to methane by methanogens. Chemical properties such as the presence of hydrophobic functional groups, molecular nature and redox active groups on biochar surface promote interaction between biochar and microorganisms and provide an increased degree of electron transfer between the attached microorganisms. The above characteristics depend on feedstock and pyrolysis conditions used for biochar production. Unlike previous reviews, herein the desired physical and chemical properties of biochar that promote syntrophy in AD and the factors that influence them have been discussed in detail. Furthermore, engineering of biochar properties by various activation methods to harness favourable characteristics of biochar as an effective AD additive is described. Such a comprehensive account would be useful for engineering efficient biochar-mediated digestions with enhanced syntrophy and overall AD performance.

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Section: Modifications Of Molecular Structure Of Biochar and Their Impact On Microbial Interactions For Improved Ad Performancementioning

confidence: 54%

Syntrophic interactions in anaerobic digestion: how biochar properties affect them?

Johnravindar

Patria

Lee

et al. 2021

Sustainable Environment

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“…Increasing biochar concentration is therefore a means to improve methanogenesis, which may further result in a promotion of waste degradation. This nding is supported by biochar properties that are likely to stabilize anaerobic digestion and rise biomethane yield (Gao et al, 2020;Lim et al, 2020). For instance, providing immobilization sites for microorganisms could explain the higher anaerobic degradation and methanogenic performance (Zhang et al, 2018;.…”

Section: Effect Of Biochar Concentrationmentioning

confidence: 92%

“…Indeed, reports have shown that methanogens that use acetate and hydrogen as substrates coexist in the anaerobic fermentation system (Madigou et al, 2019;Zhang et al, 2019). Compared to hydrogenetrophic methanogens, acetoclastic methanogens should contribute more to methane production with su cient organic substrates (Garcia-Mancha et al, 2017; Lim et al, 2020;Xiao et al, 2019a). Overall, biochar addition improves biomethane production by methanogens, yet acetoclastic and hydrogenetrophic methanogens display similar performances.…”

Section: Methanogenic Speciesmentioning

confidence: 99%

Biochar promotes methane production during anaerobic digestion of organic waste

et al. 2021

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Climate change and energy demand are calling more sustainable fuels such as biomethane produced by anaerobic digestion of organic waste. Biochar addition to waste is presumed to enhance the e ciency of methane production, yet individual reports disclose contradictory results. Therefore, we performed a meta-analysis of 27 selected publications containing 156 paired measurements of control and biocharamended treatments to assess the impact of biochar on methanogenic performance. Results show that biochar promotes biomethane production substantially with a high Hedge's d value of 5.7 ± 1.04, yet sporadic publications report a methane decline. Methanogenic performance is statistically controlled by feedstock type, pyrolysis temperature and biochar concentration, but not controlled by pH, size, surface area and methanogen species. Our ndings should help to tune the parameters of anaerobic digestion with biochar to optimize biomethane productions.

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“…Though pH is not an early indicator of process steadiness, it is crucial to control also the VFAs to alkalinity ratio to decide about feeding the digester. From an OLR of 3.5 kg VS/m 3 •d, the VFA:TAC ratio was around 0.67 ± 0.04, associated with a fall in pH over a value of 6, thereby hindering methanogen growth, leading to an excessive amount of CO 2 formation and causing R2 inhibition [31]. Similar findings were found by Hegde et Trabold, (2019) who reported that the pH of the substrate used supported a faster acclimatization of the microorganisms [65], allowing easy uptake of certain required nutrients, and revealed that the maximum methane yield was observed for mono-digested and co-digested FW, with CM under an OLR of 2.8 kg VS/m 3 •d, and for a range of pH from 6.8 and 7.3.…”

Section: Earlymentioning

confidence: 99%

“…To this end, Rasapoor et al, (2020) investigated the effects of different AC and biochar additions on biogas generation yield during AD of complex organic waste rather than mono-substrate waste and revealed that biochar improved the methane yield and adsorbed ammonia nitrogen better than AC [30]. In fact, this might be due to the potential of biochar to enhance the biodegradation performance, as it is characterized by a porous structure favoring the colonization of functional microbial communities [29,31]. From a biological point of view, biochar was considered as having a microbial-support function by exchanging electrons from a donor to an acceptor [32].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions

Chaher

Nassour

Hamdi

et al. 2021

Foods

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This study proposed the selection of cost-effective additives generated from different activity sectors to enhance and stabilize the start-up, as well as the transitional phases, of semi-continuous food waste (FW) anaerobic digestion. The results showed that combining agricultural waste mixtures including wheat straw (WS) and cattle manure (CM) boosted the process performance and generated up to 95% higher methane yield compared to the control reactors (mono-digested FW) under an organic loading rate (OLR) range of 2 to 3 kg VS/m3·d. Whereas R3 amended with unmarketable biochar (UBc), to around 10% of the initial fresh mass inserted, showed a significant process enhancement during the transitional phase, and more particularly at an OLR of 4 kg VS/m3·d, it was revealed that under these experimental conditions, FW reactors including UBc showed an increase of 144% in terms of specific biogas yield (SBY) compared to FW reactors fed with agricultural residue. Hence, both agricultural and industrial waste were efficacious when it came to boosting either FW anaerobic performance or AD effluent quality. Although each co-substrate performed under specific experimental conditions, this feature provides decision makers with diverse alternatives to implement a sustainable organic waste management system, conveying sufficient technical details to draw up appropriate designs for the recovery of various types of organic residue.

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Methanogenic pathway and microbial succession during start-up and stabilization of thermophilic food waste anaerobic digestion with biochar

Cited by 95 publications

References 45 publications

Syntrophic interactions in anaerobic digestion: how biochar properties affect them?

Syntrophic interactions in anaerobic digestion: how biochar properties affect them?

Biochar promotes methane production during anaerobic digestion of organic waste

Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions

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