The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

Ma, Haiyuan; Hu, Yujin; Kobayashi, Takuro; Xu, Kaiqin

doi:10.1016/j.btre.2020.e00515

Cited by 34 publications

(17 citation statements)

References 26 publications

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“…At least in the short term, no significant differences between the treatments were detected (p = 0.637). This is surprising and contradicts previous reports of an accelerated degradation of fibrous biomass [66], even though the authors suggested an optimum biochar concentration of 15 g L -1 , which is approximately six times and three times higher than seen for the low and the high concentration in this study, respectively. This may at least partially explain the divergence of both studies; however, more research is needed to investigate the degradation of lignocellulose-rich biomass at 45°C, since it represents one of the major drawbacks of AD when treating agricultural residues.…”

Section: Gas Measurement and Physico-chemical Analysiscontrasting

confidence: 99%

Can the addition of biochar improve the performance of biogas digesters operated at 45°C?

Masebinu

Fanoro

Insam

et al. 2021

Environmental Engineering Research

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Biogas from anaerobic digestion (AD) may contribute towards a green energy scene in the future. Despite many benefits, AD plant operators are still challenged by limitations of the technology. This study aimed at evaluating the effect of biochar addition to AD reactors operated at 45°C to optimize productivity, efficiency and stability of the process. Biochar is characterized by a large surface area and may therefore facilitate the creation of biofilms on the one hand and remove environmental contaminants on the other hand. Moreover, biochar may serve as pH control agent due to its alkaline properties, counteracting reactor acidification. Our results showed that the addition of biochar reduced efficiently the amount of H2S that initially occurred in the headspace during reactor start-up. Nevertheless, no impact on biogas- and methane yields was observed. This might be explained with an already well-working AD system without any severe disturbances, where the balancing nature of biochar did hardly count. Future studies, however, need to evaluate the effect on stressed systems. The microbiome analysis provided a detailed view of the microbial dynamics during the start-up phase, revealing Methanosarcina as dominant methanogen in the end. The addition of biochar did not alter the microbial community composition.

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Section: Gas Measurement and Physico-chemical Analysiscontrasting

confidence: 99%

Can the addition of biochar improve the performance of biogas digesters operated at 45°C?

Masebinu

Fanoro

Insam

et al. 2021

Environmental Engineering Research

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“…First, the lower pH value caused by the formation of volatile fatty acids can be offset by some functional groups in the biochar, where the amine group adsorbs hydronium ion and acts as an electron acceptor media. Biochar's exceptional buffering capability against the formation of volatile fatty acids in anaerobic digesters operating at a higher organic loading rate was previously reported (Ma et al 2020 ). Second, the inorganic metals contained in biochar, such as calcium, magnesium, potassium, sodium, silicon, iron, aluminium, and sulphur, can contribute to the biochar's alkalinity characteristics (Zhang et al 2018b ).…”

Section: Anaerobic Digestionmentioning

confidence: 68%

“…For example, it was reported that the addition of 10 g L −1 of substrate biochar to thermophilic semi-continuous anaerobic digestion of food waste improved the pH value from 7.7 to 8.2 and mitigated the formation of total volatile fatty acids due to its buffering capacity (Lim et al 2020 ). Similarly, a decreased lag phase of up to 44% and a 25% increase in methane productivity were reported as a result of the buffering effect of the 15 g L −1 addition (Ma et al 2020 ).…”

Section: Anaerobic Digestionmentioning

confidence: 80%

“…Various authors demonstrated that the addition of biochar improved the stability and neutral capacity of the anaerobic digestion system (Ma et al 2020 ), which resulted in an increase in the maximum methane generation rate and a decrease in the lag time during anaerobic digestion of biowaste. For example, it was reported that the addition of 10 g L −1 of substrate biochar to thermophilic semi-continuous anaerobic digestion of food waste improved the pH value from 7.7 to 8.2 and mitigated the formation of total volatile fatty acids due to its buffering capacity (Lim et al 2020 ).…”

Section: Anaerobic Digestionmentioning

confidence: 99%

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Biochar for agronomy, animal farming, anaerobic digestion, composting, water treatment, soil remediation, construction, energy storage, and carbon sequestration: a review

et al. 2022

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In the context of climate change and the circular economy, biochar has recently found many applications in various sectors as a versatile and recycled material. Here, we review application of biochar-based for carbon sink, covering agronomy, animal farming, anaerobic digestion, composting, environmental remediation, construction, and energy storage. The ultimate storage reservoirs for biochar are soils, civil infrastructure, and landfills. Biochar-based fertilisers, which combine traditional fertilisers with biochar as a nutrient carrier, are promising in agronomy. The use of biochar as a feed additive for animals shows benefits in terms of animal growth, gut microbiota, reduced enteric methane production, egg yield, and endo-toxicant mitigation. Biochar enhances anaerobic digestion operations, primarily for biogas generation and upgrading, performance and sustainability, and the mitigation of inhibitory impurities. In composts, biochar controls the release of greenhouse gases and enhances microbial activity. Co-composted biochar improves soil properties and enhances crop productivity. Pristine and engineered biochar can also be employed for water and soil remediation to remove pollutants. In construction, biochar can be added to cement or asphalt, thus conferring structural and functional advantages. Incorporating biochar in biocomposites improves insulation, electromagnetic radiation protection and moisture control. Finally, synthesising biochar-based materials for energy storage applications requires additional functionalisation.

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“…In fact, the continuous increase in the VFA: TAC ratio from 0.67 to 0.89 revealed that R2 was overloaded, marking the process failure of the digesters fed with mixed food waste and agricultural residue, at an OLR of 4 kg VS/m 3 •d. On the other hand, relatively stable performance of R3 was observed under the same experimental conditions with a VFAs concentration of 3115 mg/L, and a total alkalinity of about 5840 mg CaCO 3 /L, indicating that the system was not inhibited by acidification, even if the VFA: TAC ratio overstepped the upper bound of the overloading value by attaining 0.53 [62]. In the same context, Ma et al, (2020) reported that accumulated acids were readily converted to biogas in the presence of biochar as an additive because such a buffering agent might be efficient in terms of reducing VFA accumulation by boosting the direct interspecies electron transfer (DIET) functions between acidogenesis and methanogenesis microorganisms [63].…”

Section: Effect Ofmentioning

confidence: 84%

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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The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

Cited by 34 publications

References 26 publications

Can the addition of biochar improve the performance of biogas digesters operated at 45°C?

Can the addition of biochar improve the performance of biogas digesters operated at 45°C?

Biochar for agronomy, animal farming, anaerobic digestion, composting, water treatment, soil remediation, construction, energy storage, and carbon sequestration: a review

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

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