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• W4309774854 endingPage "140449" @default.
• W4309774854 startingPage "140449" @default.
• W4309774854 abstract "Biogas from anaerobic digestion requires desulfurisation before its intended use due to the corrosive nature of H2S. Anaerobic digesters produce biogas continuously and require a continuous process for desulfurisation. Commonly, H2S is removed using adsorption to solid media (iron sponge) or absorption and removal through chemical processes (scrubbing), requiring regeneration or replacement of sorbents. As an alternative, a continuous, anaerobic H2S removal process, utilising purple phototrophic bacteria was developed. The removal is driven by light as an energy source and potentially reduces the requirement for caustic. A desulfurisation bubble column was fed continuously with a synthetic biogas mixture (2000/5000 ppmV H2S, 30% CO2, CH4 balance) at sulfide loading rates ranging from 3.06 to 11.88 mg-S d−1. The liquid was inoculated with purple phototrophic bacteria, nutrients supplied via centrate, an anaerobic digestion residue, and externally irradiated with IR-light. The maximum sulfide removal rate was 10.13 ± 0.06 mg-S (Lh)−1 at a loading rate of 11.83 mg-S (Lh)−1, and the biomass oxidised the sulfide to sulfate utilising electrons for growth. Initially, caustic was dosed to control pH, which was replaced by hydraulic flushing (HRT 4 days), resulting in a mean pH of 6.8 at applied sulfide loading rate of 9.44 mg-S (Lh)−1. A reduction in HRT to 2 days resulted in performance loss. Thus, controlling the biomass inventory was found to be the major challenge of the process. Overall, the process can run caustic-free, and integrate with anaerobic digestion using the centrate as a nutrient source, with light supply limiting feasibility for night-time operation in a scaled process." @default.
• W4309774854 created "2022-11-29" @default.
• W4309774854 creator A5031282400 @default.
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• W4309774854 date "2023-02-01" @default.
• W4309774854 modified "2023-09-25" @default.
• W4309774854 title "Continuous H2S removal from biogas using purple phototrophic bacteria" @default.
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• W4309774854 doi "https://doi.org/10.1016/j.cej.2022.140449" @default.
• W4309774854 hasPublicationYear "2023" @default.
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