Enhanced ethanol-driven carboxylate chain elongation by Pt@C in simulated sequencing batch reactors: Process and mechanism

Article Biotechnology & Applied Microbiology

Mixotrophic chain elongation with syngas and lactate as electron donors

Flavio C. F. Baleeiro et al.

Summary: Feeding microbial communities with both organic and inorganic substrates can improve sustainability and feasibility of chain elongation processes, leading to improved production efficiency.

MICROBIAL BIOTECHNOLOGY (2023)

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Article Biotechnology & Applied Microbiology

Transcriptome analysis reveals reasons for the low tolerance of Clostridium tyrobutyricum to furan derivatives

Yukai Suo et al.

Summary: Lignocellulosic biomass is a rich and renewable feedstock for biobased butyric acid production. However, the presence of furan derivatives from the pretreatment of lignocellulose severely inhibits the growth of the best strain for producing butyric acid, Clostridium tyrobutyricum. This study investigated the tolerance mechanism of C. tyrobutyricum to furan derivatives and found that upregulation of genes related to membrane transport, heat shock proteins, and transcriptional regulation occurs under furan derivative stress. Additionally, it was discovered that C. tyrobutyricum is unable to rapidly convert furan derivatives to low-toxicity alcohols, leading to its low tolerance. These findings provide insights into the development of furan derivative-tolerant strains for enhanced bioconversion of lignocellulosic biomass to butyric acid.

APPLIED MICROBIOLOGY AND BIOTECHNOLOGY (2023)

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Article Nanoscience & Nanotechnology

Supported Pt Enabled Proton-Driven NAD(P)+ Regeneration for Biocatalytic Oxidation

Joseph W. H. Burnett et al.

Summary: This study presents the design of a carbon-supported Pt catalyst that can regenerate NAD(P)(+) by proton-driven NAD(P)H oxidation with concurrent hydrogen formation. The electronic nature of Pt nanoparticles was adjusted by modifying the carbon support, and it was found that the electron-rich Pt on carbon exhibited the best catalyst performance for NAD(P)(+) regeneration. The Pt catalyst was successfully applied in biocatalytic oxidation reactions of various alcohols, demonstrating good compatibility and regeneration function for the conversion of alcohols to ketones or lactones.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Review Agricultural Engineering

Understanding the management of household food waste and its engineering for sustainable valorization- A state-of-the-art review

Dibyajyoti Haldar et al.

Summary: Increased urbanization and industrialization have led to higher energy demand, increased waste output, and negative environmental impacts. This highlights the need for effective solid-waste-management policies, particularly for food waste. The global generation of food waste is estimated at 1.6 gigatons per year, with an economic value of 750 billion USD. However, the diverse composition and varying moisture content of food waste pose challenges in transforming it into value-added products. This review comprehensively discusses the socio-economic challenges and environmental concerns associated with solid waste management, and critically reviews engineering aspects for efficient food waste management.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

Efficient production of medium chain fatty acids in microbial electrosynthesis with simultaneous bio-utilization of carbon dioxide and ethanol

Zhigang Li et al.

Summary: This study investigates the impact of different chain elongation methods on MCFAs production in MES reactors and provides evidence for simultaneous bio-utilization of CO2 and ethanol. The results of this study provide fundamental insights into carbon and electron fluxes driven by electricity.

BIORESOURCE TECHNOLOGY (2022)

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Article Chemistry, Physical

Heterogeneous Catalyst-Microbiome Hybrids for Efficient CO-Driven C6 Carboxylic Acid Synthesis via Metabolic Pathway Manipulation

Chao Liu et al.

Summary: In this study, a hybrid approach combining efficient carbon fixation catalysts with anaerobic microbiomes was developed to improve the conversion and production of medium chain carboxylic acids from syngas.

ACS CATALYSIS (2022)

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Article Agricultural Engineering

High-rate conversion of lactic acid-rich streams to caproic acid in a fermentative granular system

Quinten Marien et al.

Summary: Lactic acid-driven chain elongation allows for the conversion of low-value organic streams into caproic acid. This study investigated the impact of varying glucose-to-lactate ratios and found that decreasing glucose-content eliminated unwanted by-products. The study also observed that decreasing glucose-content led to a decrease in granular biomass, but re-granulation was triggered by lowering the hydraulic retention time and feeding only lactic and acetic acid, resulting in the highest reported lactic acid-driven caproic acid production rates.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

Long-term semi-continuous acidogenic fermentation for food wastes treatment: Effect of high organic loading rates at low hydraulic retention times and uncontrolled pH conditions

Quan Yuan et al.

Summary: This study investigated the impact of high organic loading rates and low hydraulic retention times without pH control on food waste fermentation. The results showed that the acidogenic fermentation process remained stable even with a decrease in hydraulic retention time. The composition of fermentation products varied with different hydraulic retention times, with lactic acid and ethanol being the dominant end-products. CO2 was the main biogas produced, while H2 and CH4 were absent. The concentration of total fermentation products decreased with shorter hydraulic retention times, but the fermentation products rate was highest at the lowest hydraulic retention time. Lactobacillus was the predominant bacteria at the genus level. This research demonstrated the feasibility of operating an acidogenic fermentation reactor at high organic loading rates, low hydraulic retention times, and without pH control, which can improve reactor capacity, reduce construction and operation costs, and simplify operation.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

New insight into mechanisms of ferroferric oxide enhancing medium-chain fatty acids production from waste activated sludge through anaerobic fermentation

Yufen Wang et al.

Summary: This study proposes a method using ferroferric oxide technology to increase the production of medium chain fatty acids (MCFAs) in waste activated sludge. The results show that ferroferric oxide enhances the yield of MCFAs in the sludge and changes the distribution of key microorganisms, while also improving sludge dewatering and phosphorus removal.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

Biochar and activated carbon enhance ethanol conversion and selectivity to caproic acid by Clostridium kluyveri

Stef Ghysels et al.

Summary: The study found that the addition of biochar and activated carbon in the secondary fermentation of syngas fermentation effluent can increase caproic acid production and selectivity. Biochar performs well in reducing the lag phase and increasing yield, with good recyclability. Activated carbon, especially at high doses, can enhance the conversion rate and selectivity towards caproic acid.

BIORESOURCE TECHNOLOGY (2021)

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Article Engineering, Environmental

Continuous medium chain carboxylic acids production from excess sludge by granular chain-elongation process

Qinglian Wu et al.

Summary: The production of short chain carboxylic acids (SCCAs) is a primary method for recycling excess sludge (ES). This study utilized chain elongation technology to upgrade SCCAs-rich sludge into medium chain carboxylic acids (MCCAs) with high hydrophobicity. The research achieved high yields of MCCAs and obtained branched-MCCAs for the first time, laying a foundation for ES recycling.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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Article Engineering, Environmental

Phenol promoted caproate production via two-stage batch anaerobic fermentation of organic substance with ethanol as electron donor for chain elongation

Jun He et al.

Summary: The study found that 1 g/L phenol had a positive effect on caproate production, while 1.5 g/L phenol inhibited the production of short chain fatty acids and chain elongation processes.

WATER RESEARCH (2021)

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Article Agricultural Engineering

Nano zero-valent iron: A pH buffer, electron donor and activator for chain elongation

Xindi Fu et al.

Summary: The addition of nano zero-valent iron (NZVI) can enhance the production of caproate by preventing pH drop, while also reshaping microbial communities.

BIORESOURCE TECHNOLOGY (2021)

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Article Engineering, Environmental