A general framework to model the fate of trace elements in anaerobic digestion environments

Maharaj, Bikash Chandra; Mattei, Maria Rosaria; Frunzo, Luigi; Hullebusch, Eric D. van; Esposito, Giovanni

doi:10.1038/s41598-021-85403-2

Cited by 11 publications

(3 citation statements)

References 56 publications

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“…For this reason, the reduction of metal in solution was simply modeled as a first order kinetic referred to the manganese concentration in solution (assuming the reaction order parameter c equal to 1). Indeed, other models considered the same approximation to reproduce metals precipitation and metals adsorption phenomena 40 – 42 .…”

Section: Methodsmentioning

confidence: 99%

Mathematical modeling of metal recovery from E-waste using a dark-fermentation-leaching process

Russo

Luongo

Mattei

et al. 2022

Sci Rep

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In this work, an original mathematical model for metals leaching from electronic waste in a dark fermentation process is proposed. The kinetic model consists of a system of non-linear ordinary differential equations, accounting for the main biological, chemical, and physical processes occurring in the fermentation of soluble biodegradable substrates and in the dissolution process of metals. Ad-hoc experimental activities were carried out for model calibration purposes, and all experimental data were derived from specific lab-scale tests. The calibration was achieved by varying kinetic and stoichiometric parameters to match the simulation results to experimental data. Cumulative hydrogen production, glucose, organic acids, and leached metal concentrations were obtained from analytical procedures and used for the calibration. The results confirmed the high accuracy of the model in describing biohydrogen production, organic acids accumulation, and metals leaching during the biological degradation process. Thus, the mathematical model represents a useful and reliable tool for the design of strategies for valuable metals recovery from waste or mineral materials. Moreover, further numerical simulations were carried out to analyze the interactions between the fermentation and the leaching processes and to maximize the efficiency of metals recovery due to the fermentation by-products.

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Section: Methodsmentioning

confidence: 99%

Mathematical modeling of metal recovery from E-waste using a dark-fermentation-leaching process

Russo

Luongo

Mattei

et al. 2022

Sci Rep

Self Cite

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“…Supplementing trace elements in mixed cultures can be challenging as different organisms may require different elements in varying concentrations [37]. The bioavailability of trace elements may also change over time due to precipitation, dissolution, organic complexation, adsorption, the biotransformation of intermediates containing trace elements, and biouptake [38].…”

Section: Initial Phasementioning

confidence: 99%

Optimization of the Ex Situ Biomethanation of Hydrogen and Carbon Dioxide in a Novel Meandering Plug Flow Reactor: Start-Up Phase and Flexible Operation

Hoffstadt,

Nikolausz,

Krafft

et al. 2024

Bioengineering

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With the increasing use of renewable energy resources for the power grid, the need for long-term storage technologies, such as power-to-gas systems, is growing. Biomethanation provides the opportunity to store energy in the form of the natural gas-equivalent biomethane. This study investigates a novel plug flow reactor that employs a helical static mixer for the biological methanation of hydrogen and carbon dioxide. In tests, the reactor achieved an average methane production rate of 2.5 LCH4LR∗d (methane production [LCH4] per liter of reactor volume [LR] per day [d]) with a maximum methane content of 94%. It demonstrated good flexibilization properties, as repeated 12 h downtimes did not negatively impact the process. The genera Methanothermobacter and Methanobacterium were predominant during the initial phase, along with volatile organic acid-producing, hydrogenotrophic, and proteolytic bacteria. The average ratio of volatile organic acid to total inorganic carbon increased to 0.52 ± 0.04, while the pH remained stable at an average of pH 8.1 ± 0.25 from day 32 to 98, spanning stable and flexible operation modes. This study contributes to the development of efficient flexible biological methanation systems for sustainable energy storage and management.

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“…Lignin, cellulose and hemicellulose are highly recalcitrant and provide the measure of how easily the substrates can be biodegraded by microorganism during the AD process (Kucharska et al, 2018). The addition of trace elements in the AD systems plays significant roles in improving enzyme activities, growth of methanogens and stability of the anaerobic digestion process (Banks et al, 2011;Habagil et al, 2020;Maharaj et al, 2021). The VFA and alkalinity values are essential for assessing the conversion of organic matter and buffering capacities of AD systems (Maragkaki et al, 2018).…”

Section: Characterization Of the Banana Leaves Wastes For The Fungal ...mentioning

confidence: 99%

Strategies to improve anaerobic digestion and environ-economic analysis of municipal solid wastes management options

Richard

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Different strategies have widely been applied for improving the anaerobic digestion of the organic fraction of municipal solid wastes. However, because of the heterogeneous compositions of organic fraction of municipal solid wastes, studies on different strategies are still required. This thesis focused on examining methods to improve anaerobic digestion of organic fraction of municipal solid wastes and environ-economic analysis of municipal solid wastes management options. Firstly, the study examined the effects of fungal (Pleurotus ostreatus) treatment of the banana leaves wastes towards edible mushrooms and biogas recovery. Secondly, the study assessed the effectiveness of banana winery wastewater in digesting the banana leaves wastes to improve methane yield. Thirdly, the study examined the potential of edible clay soils towards improving the anaerobic digestion of food wastes for biogas recovery. Next, the study analyzed and compared the environmental impacts of anaerobic digestion and other municipal solid waste management scenarios in the Arusha City of Tanzania. Finally, the study assessed the economic feasibility of the biogas plants for treating food and banana leaves wastes in the Arusha City of Tanzania. All the anaerobic digestion experiments were carried out in batch reactors. The environmental impact was analyzed using a life cycle analysis methodology. Fungal treatment of banana leaves wastes prior to anaerobic digestion process resulted in the biogas yield of 282 mL g -1 VS -1 and production of 181 ± 19 g of edible mushrooms per 2 kg of banana leaves wastes. The cost analysis revealed that mushroom cultivation has a higher economic value and therefore favoured before the anaerobic digestion process. Banana winery wastewater pre-treatment of banana leaves waste resulted in increased methane yield by 193% compared to non-pretreated banana leaves waste. The edible clay soils supplementation in the anaerobic digestion process resulted in an increase of 26.9% methane yield in a reactor with edible clay soils supplementation. Evaluations on environmental impacts revealed that the anaerobic digestion process outranked the current management option (Landfill) with the least environmental burdens. The study also revealed it is economically viable to invests the biogas plants for treating food and banana leaves wastes in Arusha City of Tanzania.

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A general framework to model the fate of trace elements in anaerobic digestion environments

Cited by 11 publications

References 56 publications

Mathematical modeling of metal recovery from E-waste using a dark-fermentation-leaching process

Mathematical modeling of metal recovery from E-waste using a dark-fermentation-leaching process

Optimization of the Ex Situ Biomethanation of Hydrogen and Carbon Dioxide in a Novel Meandering Plug Flow Reactor: Start-Up Phase and Flexible Operation

Strategies to improve anaerobic digestion and environ-economic analysis of municipal solid wastes management options

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