Metabolic effects of Fe0 on simultaneously eliminating excessive acidification and upgrading biogas in mesophilic or thermophilic anaerobic reactor

Article Biotechnology & Applied Microbiology

Promotion of biological H2 (Bio-H2) production by the nitrogen-fixing anaerobic microbial consortia using humin, a solid-phase humic substance

Sujan Dey et al.

Summary: This study achieved high yields of Bio-H-2 production by using nitrogen-fixing consortia under nitrogen-deficient conditions with glucose or mannitol as substrate and humin as the extracellular electron mediator.

JOURNAL OF BIOSCIENCE AND BIOENGINEERING (2022)

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Article Engineering, Environmental

Electrochemical and microbiological response of exoelectrogenic biofilm to polyethylene microplastics in water

Song Wang et al.

Summary: This study investigates the influence of polyethylene (PE) microplastics on exoelectrogenic biofilm. The experiments reveal that an increase in PE microplastics concentration leads to a decline in current density and abundance of electroactive bacteria in the biofilm. The viability of the biofilm is also restrained by the presence of PE microplastics, resulting in higher system electrode resistance. Furthermore, microbial community richness and expression of electron transfer-related genes decrease after the addition of microplastics.

WATER RESEARCH (2022)

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Article Engineering, Environmental

Responses of mesophilic anaerobic sludge microbiota to thermophilic conditions: Implications for start-up and operation of thermophilic THP-AD systems

Liang Zhang et al.

Summary: This study investigates the impact of thermophilic conditions on the assembly of microbial communities and their effects on anaerobic digestion (AD) ecosystem function. The inocula from full-scale systems showed greater resilience to thermophilic environment and demonstrated higher methane production. Deterministic processes played a dominant role in community assembly, but stochastic processes were more influential in dysfunctional AD ecosystems. The thermophilic environment exerted strong selective pressure on microbial network structures.

WATER RESEARCH (2022)

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Article Engineering, Environmental

Deeper insights into the effects of substrate to inoculum ratio selection on the relationship of kinetic parameters, microbial communities, and key metabolic pathways during the anaerobic digestion of food waste

Yanzeng Li et al.

Summary: This study comprehensively explored the effects of different substrate to inoculum ratios (S/I) on the kinetic parameters, microbial communities, and metabolic pathways during the anaerobic digestion process of food waste. The results showed that low S/I ratios were favorable for methanogenesis, while high S/I ratios led to irreversible acidification. S/I = 1:3 had the highest methane yield, more apparent microbial cooperation, and the highest abundance of key enzymes involved in the methanogenesis pathway.

WATER RESEARCH (2022)

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Article Energy & Fuels

Insights into the effects of micro and nanoscale Fe0 on elimination of excessive acidification during anaerobic digestion of the organic fraction of municipal solid waste: Similarities and differences in reactor performance and syntrophic metabolism

Jianan Niu et al.

Summary: This study found that nanoscale zero valent iron (NZVI) can effectively recover from acidification during anaerobic digestion and improve methane production. Compared to microscale iron, the optimal dosage of NZVI is lower and it can enhance microbial syntrophism.

FUEL (2022)

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Article Energy & Fuels

Mesophilic and thermophilic anaerobic digestion of animal manure: Integrated insights from biogas productivity, microbial viability and enzymatic activity

Jingxin Zhang et al.

Summary: This study investigated the efficiency and mechanisms of anaerobic digestion (AD) of different types of animal waste. The results showed that thermophilic AD had higher methane production and increased enzyme activity. High-DNA bacteria were more sensitive to environmental conditions. The findings provide valuable insights into the sustainable management of animal waste.

FUEL (2022)

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Article Environmental Sciences

In-situ biogas upgrading with H2 addition in an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge

Akira Hafuka et al.

Summary: This study investigates the in-situ biogas upgrading using an anaerobic membrane bioreactor (AnMBR). The addition of hydrogen gas and biogas recirculation effectively increased the methane content in the biogas. The AnMBR system achieved higher methane content and better degradation of solid compared to a continuously-stirred tank reactor.

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

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Article Engineering, Environmental

Contributions of MOF-808 to methane production from anaerobic digestion of waste activated sludge

Haoyu Liu et al.

Summary: This study investigates the effect of MOF-808 on the hydrolysis and syntrophic methanogenesis of waste activated sludge (WAS) during anaerobic digestion (AD). The results show that MOF-808 enhances methane production and the proportion of methane in biogas, as well as improves the enzymatic hydrolysis of sludge and the abiotic hydrolysis of sludge extracellular organic substances. MOF-808 also accelerates the bioconversion of volatile fatty acids (VFAs) to methane, and enriches hydrogen-producing bacteria and mixotrophic methanogens in the microbial community structure of the sludge samples.

WATER RESEARCH (2022)

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Review Biotechnology & Applied Microbiology

In situ Biogas Upgrading by CO2-to-CH4 Bioconversion

Shanfei Fu et al.

Summary: Biogas upgrading to biomethane has great potential, but in situ bioconversion technologies still face challenges. While overcoming these challenges, the technology also provides new opportunities for the development of renewable energy.

TRENDS IN BIOTECHNOLOGY (2021)

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Article Environmental Sciences

In situ biogas upgrading and enhancement of anaerobic digestion of cheese whey by addition of scrap or powder zero-valent iron (ZVI)

Panagiotis Charalambous et al.

Summary: The study investigates a new approach using zero-valent iron for biogas upgrading and buffering acidification during anaerobic digestion of cheese whey. Results show that under certain concentrations of zero-valent iron, there is potential to increase gas production efficiency and reduce volatile fatty acid concentrations.

JOURNAL OF ENVIRONMENTAL MANAGEMENT (2021)

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Article Green & Sustainable Science & Technology

How does temperature regulate anaerobic digestion?

Erqi Nie et al.

Summary: Temperature plays a crucial role in anaerobic digestion by shaping microbial ecosystems and regulating stability performance. While previous studies have discussed microbial responses to temperature changes, there is still a gap in understanding the regulation of temperature gradient on microbial communities. Adapting microorganisms to extreme temperatures could open up possibilities for industrial applications and sanitation purposes.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2021)

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Article Green & Sustainable Science & Technology

Upgrading biogas produced in anaerobic digestion: Biological removal and bioconversion of CO2 in biogas

Lan Wu et al.

Summary: This article comprehensively reviews the biotechnologies for CO2 bioconversion, including H-2-assisted chemoautotrophic reactor, gas fermentation, microbial electrochemical cells, and microalgae-based photosynthetic technique. The performance, configurations, bottlenecks, efficiencies, economic feasibility, and environmental perspectives of each method are systematically analyzed and outlined in the article. The outlook for biotechnologies with larger scalability and better economic or technical feasibility are also proposed to facilitate more efficient biogas upgrading.

RENEWABLE & SUSTAINABLE ENERGY REVIEWS (2021)

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Article Green & Sustainable Science & Technology

In-situ methane enrichment in continuous anaerobic digestion of pig slurry by zero-valent iron nanoparticles addition under mesophilic and thermophilic conditions

Miriam Cerrillo et al.

Summary: The addition of zero-valent iron nanoparticles (nZVI) had different effects on methane production during anaerobic digestion of pig slurry under mesophilic and thermophilic conditions. Batch experiments showed inhibition of methane production at all tested dosages in mesophilic conditions, while boosting methane production at the lowest dosage in thermophilic conditions. Continuous operation with nZVI addition resulted in increased methane content in biogas, with a significant increase in methane production rate compared to the control in both temperature ranges. The oxidation state of nZVI exhibited immediate oxidation upon contact with substrate and gradual oxidation during reactor operation.

RENEWABLE ENERGY (2021)

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Article Engineering, Environmental

Gradual development of ammonia-induced syntrophic acetate-oxidizing activities under mesophilic and thermophilic conditions quantitatively tracked using multiple isotopic approaches

Liping Hao et al.

Summary: This study investigates the adaptation of microbiota to increased ammonia stress in anaerobic digesters and identifies indicator microorganisms to optimize system operation. Results show the transition of methanogenic pathways from AM to SAO-HM under ammonia stress, with diverse microbial taxa involved in acetate mineralization.

WATER RESEARCH (2021)

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Article Engineering, Environmental

Zerovalent Iron Effectively Enhances Medium-Chain Fatty Acids Production from Waste Activated Sludge through Improving Sludge Biodegradability and Electron Transfer Efficiency

Yun Wang et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2020)

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Article Microbiology

Syntrophic acetate oxidation replaces acetoclastic methanogenesis during thermophilic digestion of biowaste

Stefan Dyksma et al.

MICROBIOME (2020)

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Dual roles of zero-valent iron in dry anaerobic digestion: Enhancing interspecies hydrogen transfer and direct interspecies electron transfer

Yahui Zhu et al.

WASTE MANAGEMENT (2020)

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Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition

Basma Omar et al.

BIORESOURCE TECHNOLOGY (2019)

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Exoelectrogenic Anaerobic Granular Sludge for Simultaneous Electricity Generation and Wastewater Treatment

Nannan Zhao et al.

ENVIRONMENTAL SCIENCE & TECHNOLOGY (2019)

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Article Green & Sustainable Science & Technology

Effects of organic loading rate on anaerobic digestion of chicken manure under mesophilic and thermophilic conditions

Shaojie Bi et al.

RENEWABLE ENERGY (2019)

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Trace element supplementation is associated with increases in fermenting bacteria in biogas mono-digestion of grass silage

Jamie A. FitzGerald et al.

RENEWABLE ENERGY (2019)

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Article Agricultural Engineering

Effects of nanoscale zero-valent iron on the performance and the fate of antibiotic resistance genes during thermophilic and mesophilic anaerobic digestion of food waste

Pan Wang et al.

BIORESOURCE TECHNOLOGY (2019)

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Article Biotechnology & Applied Microbiology

Detection of novel syntrophic acetate-oxidizing bacteria from biogas processes by continuous acetate enrichment approaches

Maria Westerholm et al.

MICROBIAL BIOTECHNOLOGY (2018)

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Article Agricultural Engineering

Enhancing syntrophic associations among Clostridium butyricum, Syntrophomonas and two types of methanogen by zero valent iron in an anaerobic assay with a high organic loading

Xin Kong et al.

BIORESOURCE TECHNOLOGY (2018)

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Review Biotechnology & Applied Microbiology

Biogas upgrading and utilization: Current status and perspectives

Irini Angelidaki et al.

BIOTECHNOLOGY ADVANCES (2018)

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A comparative study of thermophilic and mesophilic anaerobic co-digestion of food waste and wheat straw: Process stability and microbial community structure shifts

Xuchuan Shi et al.

WASTE MANAGEMENT (2018)

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Effect of Fe0 addition on volatile fatty acids evolution on anaerobic digestion at high organic loading rates

Xin Kong et al.

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Soil bacterial networks are less stable under drought than fungal networks

Franciska T. de Vries et al.

NATURE COMMUNICATIONS (2018)

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Ex-situ biogas upgrading and enhancement in different reactor systems

Panagiotis G. Kougias et al.

BIORESOURCE TECHNOLOGY (2017)

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Biological biogas upgrading capacity of a hydrogenotrophic community in a trickle-bed reactor

Lydia Rachbauer et al.

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Inhibiting excessive acidification using zero-valent iron in anaerobic digestion of food waste at high organic load rates

Xin Kong et al.

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Evaluation the anaerobic hydrolysis acidification stage of kitchen waste by pH regulation

Yaya Wang et al.

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Influence of zero valent scrap iron (ZVSI) supply on methane production from waste activated sludge

Guangyin Zhen et al.

CHEMICAL ENGINEERING JOURNAL (2015)

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Direct interspecies electron transfer accelerates syntrophic oxidation of butyrate in paddy soil enrichments

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Effects of mixing on the result of anaerobic digestion: Review

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Enhanced anaerobic digestion of waste activated sludge digestion by the addition of zero valent iron

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Adding Fe0 powder to enhance the anaerobic conversion of propionate to acetate

Xusheng Meng et al.

BIOCHEMICAL ENGINEERING JOURNAL (2013)

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Syntrophomonadaceae-Affiliated Species as Active Butyrate-Utilizing Syntrophs in Paddy Field Soil

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APPLIED AND ENVIRONMENTAL MICROBIOLOGY (2011)

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Comparative process stability and efficiency of anaerobic digestion; mesophilic vs. thermophilic

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Metabolic effects of Fe0 on simultaneously eliminating excessive acidification and upgrading biogas in mesophilic or thermophilic anaerobic reactor

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