Effects of biochar on anaerobic treatment systems: Some perspectives

Zhang, Liqiu; Chen, Zhuo-Kun; Zhu, Shishu; Li, Shugeng; Wei, Chun-Hai

doi:10.1016/j.biortech.2022.128226

Cited by 19 publications

(5 citation statements)

References 113 publications

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“…(1) Bacteria can communicate with each other by secreting signaling molecules in different microbial systems, which promotes biofilm formation [54]. Due to the high specific surface area and porosity of biochar, microorganisms can readily adhere and grow to form a biofilm on its surface [55]. However, signaling molecules also can be effectively adsorbed on biochar, which is attributed to properties of hydrophobic action, hydrogen bond, and functional group complexation [56], which may affect the type of microbial communities that attach.…”

Section: Changes In Archaeal Communitiesmentioning

confidence: 99%

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Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources

Ding,

Zhen,

Kong

et al. 2024

Fermentation

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Biochar has attracted increasing attention as an additive for enhancing the performance of anaerobic digestion (AD), but the effect of biochar on microbial regulatory mechanisms in enhancing AD performance is unclear. To investigate how biochar modulates the process of AD, different inoculum sources including cellulose–peptone–swine inoculum (CPI) and swine manure inoculum (SMI) were designed to determine the effect of biochar on the performance and microbial communities of anaerobic digestion of the feedstock concentration from 1 to 6%. The results showed that the methane yields of CPI seeds were higher 20.3–38.7% than those of SMI seeds without a biochar addition, whereas the biochar addition reduced 5.3 and 23.1% of the corresponding methane yield of CPI and SMI, respectively. The biochar enhances the accumulation of volatile fatty acids (VFAs) and weakens the potential ammonia inhibition by adsorption, and it can improve the degradation rate of organic content of soluble COD for different inoculum sources. Microbial community analyses showed that the biochar addition could facilitate the growth of Bacteroidetes and Clostridiales, and it enriched the relative abundance of hydrogenotrophic methanogens Methanobrevibacter and Methanobacterium. Overall, although the modulation of biochar possessed different effects on the anaerobic digestion performance, it contributed to the stability and degradation efficiency of the digestion system. The recycling implication of biochar is critical to realizing a low-carbon and renewable treatment system for organic wastes.

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Section: Changes In Archaeal Communitiesmentioning

confidence: 99%

“…(3) More biochar may release excessive toxicants, which inhibit methanogenic archaea metabolism [55]. Although biochar can act as an electron mediator to accelerate electron transfer, it also can act as an activator to induce the generation of extracellular and intracellular reactive oxygen species (ROS) [64].…”

Section: Changes In Archaeal Communitiesmentioning

confidence: 99%

Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources

Ding,

Zhen,

Kong

et al. 2024

Fermentation

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“…Except for the toxicants, the structural stability of biochar also needs to be considered. The structure of biochar may be damaged after application in microbial systems, resulting in the deterioration of biochar and the reduction of electrochemical activity [117]. Furthermore, although the porosity of biochar can be a habitat for microorganisms, it can adsorb some signaling molecules, such as DSF and c-di-GMP, and inhibit the occurrence of quorum sensing [118].…”

Section: Challenges Of Biochar In Practical Applicationmentioning

confidence: 99%

“…The effects of biochar with different particle sizes on AD performance have been widely elucidated in laboratory-scale operations. Except for 1-3 cm particle sizes of biochar, Zhang et al found that biochar with different particle sizes (<100 µm) has no significant difference in methane production [117]. However, the small particle size of biochar density is generally lower than the density of water, resulting in a tendency of biochar to be washed away [70].…”

Section: Challenges Of Biochar In Practical Applicationmentioning

confidence: 99%

“…However, the small particle size of biochar density is generally lower than the density of water, resulting in a tendency of biochar to be washed away [70]. Moreover, it is difficult to recycle biochar in practical engineering because of the incorporation of biochar and microbial systems [117]. Lu et al indicated that biogenic Fe (II), generated from the coupling of Fe-bearing biochar and microorganisms, not only significantly facilitated the reduction of nitrobenzene, but biochar could be separated with magnets from microbial systems [119].…”

Section: Challenges Of Biochar In Practical Applicationmentioning

confidence: 99%

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Biochar Facilitated Direct Interspecies Electron Transfer in Anaerobic Digestion to Alleviate Antibiotics Inhibition and Enhance Methanogenesis: A Review

Zhang

Deng

Liu

et al. 2023

IJERPH

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Efficient conversion of organic waste into low-carbon biofuels such as methane through anaerobic digestion (AD) is a promising technology to alleviate energy shortages. However, issues such as inefficient methane production and poor system stability remain for AD technology. Biochar-facilitated direct interspecies electron transfer (DIET) has recently been recognized as an important strategy to improve AD performance. Nonetheless, the underlying mechanisms of biochar-facilitated DIET are still largely unknown. For this reason, this review evaluated the role of biochar-facilitated DIET mechanism in enhancing AD performance. First, the evolution of DIET was introduced. Then, applications of biochar-facilitated DIET for alleviating antibiotic inhibition and enhancing methanogenesis were summarized. Next, the electrochemical mechanism of biochar-facilitated DIET including electrical conductivity, redox-active characteristics, and electron transfer system activity was discussed. It can be concluded that biochar increased the abundance of potential DIET microorganisms, facilitated microbial aggregation, and regulated DIET-associated gene expression as a microbial mechanism. Finally, we also discussed the challenges of biochar in practical application. This review elucidated the role of DIET facilitated by biochar in the AD system, which would advance our understanding of the DIET mechanism underpinning the interaction of biochar and anaerobic microorganisms. However, direct evidence for the occurrence of biochar-facilitated DIET still requires further investigation.

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Improved Short-Chain Fatty Acids Production and Protein Degradation During the Anaerobic Fermentation of Waste-Activated Sludge via Alumina Slag-Modified Biochar

Tang,

Chen,

Zhang

et al. 2024

Appl Biochem Biotechnol

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Effects of biochar on anaerobic treatment systems: Some perspectives

Cited by 19 publications

References 113 publications

Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources

Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources

Biochar Facilitated Direct Interspecies Electron Transfer in Anaerobic Digestion to Alleviate Antibiotics Inhibition and Enhance Methanogenesis: A Review

Improved Short-Chain Fatty Acids Production and Protein Degradation During the Anaerobic Fermentation of Waste-Activated Sludge via Alumina Slag-Modified Biochar

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