title: A novel up-flow inner-cycle anoxic bioreactor (UIAB) system for the treatment of sulfide wastewater from purification of biogas.
abstract: An up-flow inner-cycle anoxic bioreactor with a novel three phase separator was designed and implemented for the treatment of sulfide wastewater. The sulfide in wastewater could be converted to elemental sulfur by sulfide oxidizing bacteria, and recovered by simple precipitation. When the oxidation-reduction potential (ORP) was controlled at -100 mV, 91.3% of sulfide could be oxidized to elemental sulfur. To achieve high removal percentage of sulfide and conversion percentage of sulfur, the pH of influent should be controlled in the range from 7.0 to 8.0. The optimal desulfurization process was carried out at 400 mmol L(-1)d(-1) sulfide loading rate and 120 min hydraulic retention time (HRT). The removal percentage of sulfide was approximately 95.2% and elemental sulfur conversion percentage was above 90.3%. These results demonstrated that the novel up-flow in-cycle bioreactor had a potential value for the enhanced treatment of sulfide wastewater from biogas purification.
authors.affiliation: National key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Song
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Dan
authors.initials: D
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Xing
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D010100:Oxygen; D013440:Sulfides / Q000737:chemistry*; D013855:Thiobacillus / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D056804:Biofuels; D013440:Sulfides; D014874:Water Pollutants, Chemical; D010100:Oxygen