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Biological desulfurization of biogas from a field-scale anaerobic digester in Peru was tested using air injection (microaeration) in separate duplicate vessels and chemical desulfurization using duplicate iron filters to compare hydrogen sulfide (H2S) reduction, feasibility, and cost. Microaeration was tested after biogas retention times of 2 and 4 h after a single injection of ambient air at 2 L/min. The microaeration vessels contained digester sludge to seed sulfur-oxidizing bacteria and facilitate H2S removal. The average H2S removal efficiency using iron filters was 32.91%, with a maximum of 70.21%. The average H2S removal efficiency by iron filters was significantly lower than microaeration after 2 and 4 h retention times (91.5% and 99.8%, respectively). The longer retention time (4 h) resulted in a higher average removal efficiency (99.8%) compared to 2 h (91.5%). The sulfur concentration in the microaeration treatment vessel was 493% higher after 50 days of treatments, indicating that the bacterial community present in the liquid phase of the vessels effectively sequestered the sulfur compounds from the biogas. The H2S removal cost for microaeration (2 h: $29/m3 H2S removed; and 4 h: $27/m3 H2S removed) was an order of magnitude lower than for the iron filter ($382/m3 H2S removed). In the small-scale anaerobic digestion system in Peru, microaeration was more efficient and cost effective for desulfurizing the biogas than the use of iron filters.
Joanna K. Huertas; Lawrence Quipuzco; Amro Hassanein; Stephanie Lansing. Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters. Energies 2020, 13, 4793 .
AMA StyleJoanna K. Huertas, Lawrence Quipuzco, Amro Hassanein, Stephanie Lansing. Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters. Energies. 2020; 13 (18):4793.
Chicago/Turabian StyleJoanna K. Huertas; Lawrence Quipuzco; Amro Hassanein; Stephanie Lansing. 2020. "Comparing Hydrogen Sulfide Removal Efficiency in a Field-Scale Digester Using Microaeration and Iron Filters." Energies 13, no. 18: 4793.
Span>Internal biological desulfurisation is a simple and cost-efficient procedure for extracting large amounts of hydrogen sulfide (H2S) from biogas. Through introducing ambient air into the fermenter gas chamber, the H2S in the chamber is metabolised by colonising aerobic sulfur bacteria into elementary sulfur and water. In our study conducted in a fermenter at the “Unterer Lindenhof” research biogas plant, the reduction of H2S concentration (“desulfurisation”) through injecting different doses of air was investigated. It was demonstrated that a reduction in H2S of around 90 % was possible, although the amount of air required for this lay disproportionately higher than that required for a lesser degree of desulfurisation. With a 90 % reduction, ratio of air flow to biogas flow was around 0.02 and thereby lay at the lower end of the recommended range of 0.02–0.08. With a reduction of 50 %, this ratio lay at only 0.002. An even higher degree of desulfurisation (> 90 %) through introducing still more ambient air into the fermenter would have been theoretically possible, this is, however, prevented by a safety criterium that permits only a maximum measured O2 concentration of 0.5 % in the fermenter.
Joanna Kenit Huertas Parrales. Untersuchung der internen, biologischen Entschwefelung mittels Dosierung von Umgebungsluft. 2021, 1 .
AMA StyleJoanna Kenit Huertas Parrales. Untersuchung der internen, biologischen Entschwefelung mittels Dosierung von Umgebungsluft. . 2021; ():1.
Chicago/Turabian StyleJoanna Kenit Huertas Parrales. 2021. "Untersuchung der internen, biologischen Entschwefelung mittels Dosierung von Umgebungsluft." , no. : 1.