title: Bio-desulfurization of biogas using acidic biotrickling filter with dissolved oxygen in step feed recirculation.
abstract: Triple stage and single stage biotrickling filters (T-BTF and S-BTF) were operated with oxygenated liquid recirculation to enhance bio-desulfurization of biogas. Empty bed retention time (EBRT 100-180 s) and liquid recirculation velocity (q 2.4-7.1 m/h) were applied. H2S removal and sulfuric acid recovery increased with higher EBRT and q. But the highest q at 7.1 m/h induced large amount of liquid through the media, causing a reduction in bed porosity in S-BTF and H2S removal. Equivalent performance of S-BTF and T-BTF was obtained under the lowest loading of 165 gH2S/m(3)/h. In the subsequent continuous operation test, it was found that T-BTF could maintain higher H2S elimination capacity and removal efficiency at 175.6±41.6 gH2S/m(3)/h and 89.0±6.8% versus S-BTF at 159.9±42.8 gH2S/m(3)/h and 80.1±10.2%, respectively. Finally, the relationship between outlet concentration and bed height was modeled. Step feeding of oxygenated liquid recirculation in multiple stages clearly demonstrated an advantage for sulfide oxidation.
authors.affiliation: Energy Technology Research Center, Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand. Electronic address: sumate.ch@psu.ac.th.
authors.forename: Sumate
authors.initials: S
authors.lastname: Chaiprapat
authors.affiliation: Faculty of Environmental Management and PSU Energy System Research Institute (PERIN), Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand.
authors.forename: Boonya
authors.initials: B
authors.lastname: Charnnok
authors.affiliation: Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla 90110, Thailand.
authors.forename: Duangporn
authors.initials: D
authors.lastname: Kantachote
authors.affiliation: College of Agriculture, Forestry and Natural Resource Management, University of Hawaii at Hilo, Hilo, Hawaii 96720-4091, USA.
authors.forename: Shihwu
authors.initials: S
authors.lastname: Sung
mesh_terms: D056804:Biofuels; D001709:Biotechnology / Q000295:instrumentation* / Q000379:methods*; D005374:Filtration / Q000295:instrumentation*; D006862:Hydrogen Sulfide / Q000302:isolation & purification; D007700:Kinetics; D010100:Oxygen / Q000737:chemistry*; D013455:Sulfur / Q000302:isolation & purification*; D013464:Sulfuric Acids / Q000302:isolation & purification; D013997:Time Factors
chemical_list: D056804:Biofuels; D013464:Sulfuric Acids; D013455:Sulfur; C033158:sulfuric acid; D010100:Oxygen; D006862:Hydrogen Sulfide
keywords: Desulfurization; Dissolved oxygen; Liquid recirculation; Step feed; Sulfuric acid