Addition of Conductive Materials to Support Syntrophic Microorganisms in Anaerobic Digestion

König, Roger; Cuomo, Maurizio; Pianta, Elisa; Buetti‐Dinh, Antoine; Mauri, Federica; Tanadini, Matteo; Principi, Pamela

doi:10.3390/fermentation8080354

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…Phosphorus recovery is enhanced by the addition of different forms of iron: rusty scrap iron [417], zero-valent iron nanoparticles (NZVI) [418], and steel slag [419]. Magnetite, stainless steel, and the addition of other conductive materials promote the direct interspecies electron transfer (DIET) between the exoelectrogenic bacteria (organic oxidizing bacteria, iron-reducing bacteria, sulfide oxidizing bacteria, and iron sulfate reducing bacteria) and electrotrophic methanogens [393,420]. A controlled DIET process determines the accumulation of zerovalent sulfur in the digestate [421], which increases its plant nutrient content.…”

Section: Nitrogen Sulfur and Phosphate Recovery During The Anaerobic ...mentioning

confidence: 99%

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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The recovery of plant mineral nutrients from the bio-based value chains is essential for a sustainable, circular bioeconomy, wherein resources are (re)used sustainably. The widest used approach is to recover plant nutrients on the last stage of biomass utilization processes—e.g., from ash, wastewater, or anaerobic digestate. The best approach is to recover mineral nutrients from the initial stages of biomass biorefinery, especially during biomass pre-treatments. Our paper aims to evaluate the nutrient recovery solutions from a trans-sectorial perspective, including biomass processing and the agricultural use of recovered nutrients. Several solutions integrated with the biomass pre-treatment stage, such as leaching/bioleaching, recovery from pre-treatment neoteric solvents, ionic liquids (ILs), and deep eutectic solvents (DESs) or integrated with hydrothermal treatments are discussed. Reducing mineral contents on silicon, phosphorus, and nitrogen biomass before the core biorefinery processes improves processability and yield and reduces corrosion and fouling effects. The recovered minerals are used as bio-based fertilizers or as silica-based plant biostimulants, with economic and environmental benefits.

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Section: Nitrogen Sulfur and Phosphate Recovery During The Anaerobic ...mentioning

confidence: 99%

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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“…The interspecies electron transfer (IET) between archaea and microbes is the key to the performance of the anaerobic digestion process [ 10 , 11 ]. The use of anaerobic additives such as magnetite-nanoparticles can be used to improve the IET in anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

Application of Magnetite-Nanoparticles and Microbial Fuel Cell on Anaerobic Digestion: Influence of External Resistance

et al. 2023

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In this paper, the application of magnetite-nanoparticles and a microbial fuel cell (MFC) was studied on the anaerobic digestion (AD) of sewage sludge. The experimental set-up included six 1 L biochemical methane potential (BMP) tests with different external resistors: (a) 100 Ω, (b) 300 Ω, (c) 500 Ω, (d) 800 Ω, (e) 1000 Ω, and (f) a control with no external resistor. The BMP tests were carried out using digesters with a working volume of 0.8 L fed with 0.5 L substrate, 0.3 L inoculum, and 0.53 g magnetite-nanoparticles. The results suggested that the ultimate biogas generation reached 692.7 mL/g VSfed in the 500 Ω digester, which was substantially greater than the 102.6 mL/g VSfed of the control. The electrochemical efficiency analysis also demonstrated higher coulombic efficiency (81.2%) and maximum power density (30.17 mW/ m2) for the 500 Ω digester. The digester also revealed a higher maximum voltage generation of 0.431 V, which was approximately 12.7 times the 0.034 V of the lowest-performing MFC (100 Ω digester). In terms of contaminants removed, the best-performing digester was the digester with 500 Ω, which reduced contaminants by more than 89% on COD, TS, VS, TSS and color. In terms of cost-benefit analysis, this digester produced the highest annual energy profit (48.22 ZAR/kWh or 3.45 USD/kWh). This infers the application of magnetite-nanoparticles and MFC on the AD of sewage sludge is very promising for biogas production. The digester with an external resistor of 500 Ω showed a high potential for use in bioelectrochemical biogas generation and contaminant removal for sewage sludge.

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“…Biochar prepared from agricultural biomass is characterized by a strong adsorption capacity, rich chemical composition, economic efficiency, and environmental friendliness, making it an important cell colonization carrier [7]. In recent years, many papers have explored the potentiality of biochar as an anaerobic digestion improver for biological fertility, facilitating direct interspecific electron transfer (DIET) within methanogenic symbiosis [7,8]. Anaerobic digestion refers to the digestion technology in which facultative bacteria and anaerobic bacteria decompose biodegradable organic matter into CH 4 and CO 2 [9].…”

Section: Introductionmentioning

confidence: 99%

Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity

Ruan

Jiang

Li³

et al. 2023

Fermentation

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Straw biochar prepared by three methods (i.e., pyrochar, HNO3-modified pyrochar, and hydrochar) was added to the anaerobic digestion system with acetic acid and ethanol as substrates to explore the effects of biochar on methane production, substrate degradation, and microbial community structure. The biogas yields of the biochar-supplemented groups all increased, and the maximum methane yield was found in the hydrochar group, which was 45.4% higher than the control. In the ethanol-fed reactor, the maximum partial pressure of hydrogen in the headspace of the hydrochar reactor was reduced from 3.5% (blank reactor) to 1.9%. Overall, methane production is directly proportional to the electron exchange capacity (EEC) value of biochar. Furthermore, the bio-aging process increased the EEC of each kind of biochar to 5.5–8.1%, which was favorable for the sustainable promotion of methanogenesis. The increased methane yield from the bio-aged biochar could either be attributable to the changes in surface oxygen-containing functional groups or the selectively enriched microbial community on the biochar, such as Geobacter, which could participate in direct interspecies electron transfer.

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Addition of Conductive Materials to Support Syntrophic Microorganisms in Anaerobic Digestion

Cited by 11 publications

References 34 publications

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Application of Magnetite-Nanoparticles and Microbial Fuel Cell on Anaerobic Digestion: Influence of External Resistance

Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity

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