Effect of pyrolysis temperature on the physiochemical properties of biochar and its potential use in anaerobic digestion: A critical review

Bardi, Mohammad Javad; Mutunga, Jackline M.; Ndiritu, Hiram; Koch, Konrad

doi:10.1016/j.eti.2023.103349

Cited by 11 publications

(9 citation statements)

References 134 publications

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“…Biochar characterization studies have two main focuses. One is analyzing how the BC properties are defined by their production and, therefore, how the physicochemical process (Pecchi and Baratieri, 2019), temperature (Bardi et al, 2023) and activation methods (Nie et al, 2024) can be used as engineering tools to obtain a material with the desired properties. The other is assessing how the BC properties determine the improvement on methane yield to define the optimal values of the key parameters (Xiao et al, 2021;Chiappero et al, 2022).…”

Section: Biochar Characterizationmentioning

confidence: 99%

“…Biochar (BC) is a carbon-rich solid generated from waste biomass (agricultural and forestry residues, OFMSW, waste activated sludge, etc.) through thermochemical processes at high temperature (350oC-950 °C) under anoxic/anaerobic conditions (pyrolysis, gasification, and hydrothermal carbonization) (Zhao et al, 2021;Bardi et al, 2023;Nie et al, 2024). Among its characteristics are a relatively high surface area (SA), favorable porosity, abundant oxygen-containing functional groups, high cation exchange capacity (CEC), and good electrical conductivity (EC) (Kumar et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Regarding AD, there are several mechanisms in which BC can help overcome the main process limitations and improve overall performance. The salts and nutrients present on the BC surface increase the buffering capacity of the AD system (Bardi et al, 2023). Its porous structure and surface functional groups make BC a great adsorbent, helping mitigate inhibition by contaminants and remove biogas impurities (CO 2 , H 2 S) (Kumar et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Its porous structure and surface functional groups make BC a great adsorbent, helping mitigate inhibition by contaminants and remove biogas impurities (CO 2 , H 2 S) (Kumar et al, 2021). Besides, it serves as a support for biomass immobilization and the formation of microbial biofilms, which offers shelter to microorganisms, reduces the lag phase, and helps develop syntrophic metabolisms among anaerobic microbes (Chiappero et al, 2020;Bardi et al, 2023). Biofilm formation, together with EC and surface functional groups, promotes direct interspecies electron transfer (DIET) between methanogenic and acetogenic microorganisms (Wang et al, 2018;Shi et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

“…The main advantage of biochar is that it can be "tailor-made" controlling the feedstock and the main process parameters (temperature and activation/modification methods) in order to obtain a material with the desired physicochemical characteristics for AD (or any other application) (Chiappero et al, 2020;Bardi et al, 2023). Overall, it seems like the costs of biochar supplementation could be balanced with the increased energy production from AD (Chiappero et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of biochars of different origin and application to the anaerobic digestion of source-selected organic fraction of municipal solid waste under batch conditions and at different dosages

García-Prats,

González,

Sánchez

2024

Front. Chem. Eng.

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Anaerobic digestion (AD) is a wide-spread strategy to manage organic waste and recover valuable products but faces some limitations that could be overcome with additives like biochar (BC). The production of BC defines its properties, which in turn determine its effect on AD performance and methane yield. In this study, three biochars (BC1, BC2 and BC3) were characterized using several techniques (SEM imaging, BET, GC, ICP and FTIR). The properties of BC were found to be defined both by the feedstock and the production process. The BC were then applied to the AD of the organic fraction of municipal solid waste (OFMSW) using three doses (1, 5% and 10% w/w TS). Compared to the control, there was an increase in methane production in BC3 at doses 1% and 5% (+15 and +30%, respectively) and a decrease in BC1 and BC2 at 1% (−33% and −19%, respectively). The decrease in biogas production was often paired with an increased methane content. A two-way ANOVA analysis showed that the interaction of biochar dose and type had a significant effect on methane yield, meaning that the effect of BC on AD cannot be predicted with the dose or the type alone. When a second substrate feeding was performed, no significant differences on methane production were observed among the experimental conditions. Key aspects to properly assess the economic viability of the process have been also discussed. Further experiments could help to fill knowledge gaps and clarify the roles of BC characteristics and dose on AD performance.

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