Factors Influencing Biochar-Strengthened Anaerobic Digestion of Cow Manure

Pan, Jiangang; Sun, Jiahui; Ao, Narisu; Xie, Yuanyuan; Zhang, Aiai; Chen, Zhuoxing; Liu, Cai

doi:10.1007/s12155-022-10396-3

Cited by 11 publications

(17 citation statements)

References 53 publications

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“…Investigations of different biochar types concerning feedstocks or pyrolysis temperatures in AD processes have been reported in previous studies (Fagbohungbe et al 2016, Kaur et al 2019, Zhang et al 2019, Chiappero et al 2021, Deng et al 2021, Pan et al 2022. For example, Deng et al (2021) demonstrated distinct effects on digesting whiskey draff in AD processes using biochar produced at pyrolyzing temperatures of 500 °C, 700 °C, and 900 °C.…”

Section: Introductionmentioning

confidence: 83%

“…The authors proposed that biochar at 700 °C, was characterized by moderate graphitization and abundant active surface functional groups, promoted interspecies electron transfer, consequently enhancing methane production. Similarly, Pan et al (2022) investigated biochar produced at different temperatures. Their experiments, conducted under organic substrate overloading conditions, used biochar derived from mushroom bran at 400 °C, 450 °C, 500 °C, 550 °C, and 600 °C.…”

Section: Introductionmentioning

confidence: 99%

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Improving acid-stressed anaerobic digestion processes with biochar - towards a combined biomass and carbon management system

Hu,

Wachendorf,

Gwenzi

et al. 2024

Environ. Res. Commun.

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Interest in biochar as an additive to enhance anaerobic digestion (AD) has grown in the context of biomass cascading use and the 2050 net-zero goal. However, few studies have investigated the effects of biochar on AD from a biochar production perspective, including biomass feedstocks and pyrolysis temperatures. To valorise biomass and better understand the mechanisms and environmental implications of using biochar in AD, we investigated the effects of distinct biochar types on AD under acid stress-induced process inhibition using batch tests. The results demonstrated that biochar can mitigate acid stress and enhance the methane production rate. The kinetic rate constant of methane production is positively related to the buffer capacity of the tested biochars (R2 = 0.88). The choice of feedstocks is a crucial factor (P = 0.003), particularly the best-performing biochars derived from raw grass silage. In contrast, the pyrolysis temperature effect was less significant (P = 0.18). Furthermore, the analysis of biochar indicates that the alkali (K) and alkaline earth (Ca, Mg) metals contained in biochar may be one of the important factors contributing to buffer capacity (R2 = 0.82 to 0.86). Hence, buffer capacity is a crucial quality criteria when evaluating biochar for AD applications. Raw grass silage biochars are promising for acid stress mitigation due to their high buffer capacity, while carbon-rich woody biochars have high CO2 sequestration potential. A compromise between mitigating acid stress and sequestering carbon is the use of pre-treated grass biochar. Overall, the use of biochar-enriched digestate offers a potential way to close material loops and complete the biomass-to-biochar value chain.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Improving acid-stressed anaerobic digestion processes with biochar - towards a combined biomass and carbon management system

Hu,

Wachendorf,

Gwenzi

et al. 2024

Environ. Res. Commun.

View full text Add to dashboard Cite

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“…Despite rigorous research works, AD is restricted by several challenges like low methane production; instability [ 8 , 25 , 26 ]; methane quality due to complexity in the physical and chemical properties of substrates [ 28 , 29 ]; quality assurance of the digestate [ 29 ]; the need to conduct additional process such as size reduction [ 30 , 31 ] to hasten degradation [ 29 , 33 ]; complexity in balancing fermentative and methanogenic microorganism [ 7 ]; and low organic loading rate (OLR) (3.5 gVS l −1 d −1 ) [ 34 ] are yet to be solved. Furthermore, small variations in the AD process can have an adverse effect, especially at the sensitive stage [ 19 , 35 ].…”

Section: Challenges In An Ad Systemmentioning

confidence: 99%

“…The addition of BC, because of its large specific surface area (SSA), enriched the genus Clostridium which shortened the fermentation period in the AD system [ 7 ]. Wang et al [ 39 ] observed that Methanosaeta and Methanosarcina were slightly inhibited at high organic loading shock but they are relatively abundant comprising around 62.08% and 10.66% of the archaeal population in the BC-amended reactor as compared to the control with the relative abundance of 29.12% and 3.34%, respectively.…”

Section: Diet-related Microorganismsmentioning

confidence: 99%

“…The influence of biochar supplementation in AD can be further explained by the composition of enriched bacteria. The most enriched group of bacteria were Firmicutes , Bacteroidota , Proteobacteria , and Actinobacteriota were relatively abundant as measured toward the end of the AD process and constitute around 52% of the total taxonomic bacterial community at the phylum level [ 7 , 65 , 68 , 69 , 93 , 94 , 148 , 161 , 182 ]. Pan et al [ 7 ] reported similar observation of relatively abundant bacteria from AD amended with mushroom biochar pyrolyzed at 550 °C in addition to Synergistetes , Acidobacteria , and Euryarchaeota with Proteobacteria Firmicutes being enriched.…”

Section: Diet-related Microorganismsmentioning

confidence: 99%

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Direct interspecies electron transfer mechanisms of a biochar-amended anaerobic digestion: a review

Valentin,

Luo,

Zhang

et al. 2023

Biotechnol Biofuels

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This paper explores the mechanisms of biochar that facilitate direct interspecies electron transfer (DIET) among syntrophic microorganisms leading to improved anaerobic digestion. Properties such as specific surface area (SSA), cation exchange capacity (CEC), presence of functional groups (FG), and electrical conductivity (EC) were found favorable for increased methane production, reduction of lag phase, and adsorption of inhibitors. It is revealed that these properties can be modified and are greatly affected by the synthesizing temperature, biomass types, and residence time. Additionally, suitable biochar concentration has to be observed since dosage beyond the optimal range can create inhibitions. High organic loading rate (OLR), pH shocks, quick accumulation and relatively low degradation of VFAs, and the presence of heavy metals and toxins are the major inhibitors identified. Summaries of microbial community analysis show fermentative bacteria and methanogens that are known to participate in DIET. These are Methanosaeta, Methanobacterium, Methanospirillum, and Methanosarcina for the archaeal community; whereas, Firmicutes, Proteobacteria, Synergistetes, Spirochetes, and Bacteroidetes are relatively for bacterial analyses. However, the number of defined cocultures promoting DIET is very limited, and there is still a large percentage of unknown bacteria that are believed to support DIET. Moreover, the instantaneous growth of participating microorganisms has to be validated throughout the process. Graphical abstract

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Anaerobic digestion and biochar/hydrochar enhancement of antibiotic-containing wastewater: Current situation, mechanism and future prospects

Zhao,

He,

Pang

et al. 2025

Environmental Research

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Factors Influencing Biochar-Strengthened Anaerobic Digestion of Cow Manure

Cited by 11 publications

References 53 publications

Improving acid-stressed anaerobic digestion processes with biochar - towards a combined biomass and carbon management system

Improving acid-stressed anaerobic digestion processes with biochar - towards a combined biomass and carbon management system

Direct interspecies electron transfer mechanisms of a biochar-amended anaerobic digestion: a review

Anaerobic digestion and biochar/hydrochar enhancement of antibiotic-containing wastewater: Current situation, mechanism and future prospects

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