Biochar enables anaerobic digestion of aqueous phase from intermediate pyrolysis of biomass

Torri, Cristian; Fabbri, Daniele

doi:10.1016/j.biortech.2014.09.021

Cited by 152 publications

(101 citation statements)

References 20 publications

(23 reference statements)

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“…Although biochar has been investigated as an additive to alleviate NH 3 inhibition in AD processes [16] and to enhance methane yield [17], no systematic research has been conducted on their potential capabilities to achieve in-situ biogas cleanup and upgrading.…”

Section: Municipal Wastewater Treatment Plants (Wwtps) In the Unitedmentioning

confidence: 99%

Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal

et al. 2015

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h i g h l i g h t sA novel anaerobic digestion (AD) process with in-situ biogas cleanup and upgrading is developed. Biochar-amended digester produced pipeline-quality (>90% CH 4 , <5 ppb H 2 S) biomethane. Corn stover biochar addition sequesters CO 2 and enhances CH 4 yield for sludge AD. Biochar addition increases alkalinity and mitigates NH 3 inhibition in the digester. Digestate from biochar-amended digester is nutrient-enriched and can be used for soil application. a b s t r a c tThis study presents a novel process for producing pipeline-quality biomethane by anaerobic digestion (AD) of sludge with in-situ biogas cleanup and upgrading using corn stover biochar. The biochar has high surface area (105 m 2 /g), high ash content (45.2% dry weight) and high concentrations of potassium, calcium and magnesium (14.2% K 2 O, 3.9% CaO and 4.2% MgO of the ash content, respectively). The biocharamended digesters produced near pipeline-quality biomethane (>90% CH 4 and <5 ppb H 2 S), facilitated CO 2 removal by up to 86.3%, boosted average CH 4 content in biogas by up to 42.4% compared to the control digester, close to fungibility of natural gas. The biochar addition enhanced the methane yield, biomethanation rate constant and maximum methane production rate by up to 7.0%, 8.1% and 27.6%, respectively. The biochar addition also increased alkalinity and mitigated ammonia inhibition, providing sustainable process stability for thermophilic sludge AD. The biochar-amended digestate is enriched with nutrients such as potassium, nitrogen and phosphorus, and therefore has great potential for soil applications.

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Section: Municipal Wastewater Treatment Plants (Wwtps) In the Unitedmentioning

confidence: 99%

Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal

et al. 2015

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“…Torri and Fabbri (2014) have also observed a similar inhibition phenomenon during the AD processing of the aqueous phase of biooil. They suggested that inhibition can be overcome by the use of pyrochars, which adsorb the problematic substances 139 . Preliminary energy balances using anaerobic digestate as potential feedstock for energy recovery through pyrolysis have been drawn 106,119,128 .…”

Section: Bioethanol Productionmentioning

confidence: 99%

“…Furthermore, it is important to note that in fields of research, thermochemical approaches are often viewed as parallel or competing with the biological ones 139 . Interestingly, strong complementarities, previously cited, underline the synergy between the dual biological/thermochemical systems.…”

Section: Research Outlooksmentioning

confidence: 99%

“…Interestingly, strong complementarities, previously cited, underline the synergy between the dual biological/thermochemical systems. As the level of process integration in the biorefinery scheme should contribute to their energetic and economical sustainability, it is important to admit that these technologies, until now considered as competitors, could be applied in series to improve the biomass conversion efficiency and further the overall energetic and economic balances 139,198 . Here, the biorefinery approach proposed is based on the literature survey of existing digestate valorization routes.…”

Section: Research Outlooksmentioning

confidence: 99%

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New opportunities for agricultural digestate valorization: current situation and perspectives

Monlau

Sambusiti

Ficara

et al. 2015

Energy Environ. Sci.

407

192

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“…A well-known problem concerning AD is inhibition of methanogenesis by various mineral or organic compounds such as ammonia, phenols or volatile fatty acids (Chen et al, 2008). Among the range of high adsorptive materials, charcoal or biochar has been reported to mitigate inhibition by ammonia (Kumar et al, 1987;Mumme et al, 2014) and biotoxic pyrolysis products (Torri and Fabbri, 2014). The authors assumed that a higher biogas yield is related to biofilm formation on the particle surface.…”

Section: Introductionmentioning

confidence: 98%

Production, characterization, and biogas application of magnetic hydrochar from cellulose

Reza

Rottler

Tölle

et al. 2015

Bioresource Technology

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Biochar enables anaerobic digestion of aqueous phase from intermediate pyrolysis of biomass

Cited by 152 publications

References 20 publications

Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal

Producing pipeline-quality biomethane via anaerobic digestion of sludge amended with corn stover biochar with in-situ CO2 removal

New opportunities for agricultural digestate valorization: current situation and perspectives

Production, characterization, and biogas application of magnetic hydrochar from cellulose

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