title: Selenium recovery from kiln powder of cement manufacturing by chemical leaching and bioreduction.
abstract: A novel process by using chemical leaching followed by bacterial reductive precipitation was proposed for selenium recovery from kiln powder as a byproduct of cement manufacturing. The kiln powder at a slurry concentration of 10 w/v% with 0.25 M Na2CO3 at 28°C produced wastewater containing about 30 mg-Se/L selenium. The wastewater was diluted four-fold and adjusted to pH 8.0 as preconditioning for bioreduction. A bacterial strain Pseudomonas stutzeri NT-I, capable of reducing selenate and selenite into insoluble elemental selenium, could recover about 90% selenium from the preconditioned wastewater containing selenium of 5 mg-Se/L when supplemented with lactate or glycerol. The selenium concentrations in the treated wastewater were low around the regulated effluent concentration of 0.1 mg-Se/L in Japan.
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail: soda@see.eng.osaka-u.ac.jp.
authors.forename: S
authors.initials: S
authors.lastname: Soda
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail: soda@see.eng.osaka-u.ac.jp.
authors.forename: A
authors.initials: A
authors.lastname: Hasegawa
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail: soda@see.eng.osaka-u.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Kuroda
authors.affiliation: Research and Development Center, Taiheiyo Cement Corporation, 2-4-2 Osaku, Sakura, Chiba 285-8655, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Hanada
authors.affiliation: Faculty of Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yamashita
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail: soda@see.eng.osaka-u.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Ike
mesh_terms: D011232:Chemical Precipitation; D007220:Industrial Waste; D007564:Japan; D010084:Oxidation-Reduction; D044223:Pseudomonas stutzeri / Q000378:metabolism*; D064586:Selenic Acid / Q000378:metabolism*; D012643:Selenium / Q000302:isolation & purification* / Q000378:metabolism; D018036:Selenium Compounds; D062065:Wastewater
chemical_list: D007220:Industrial Waste; D064586:Selenic Acid; D012643:Selenium; D018036:Selenium Compounds; D062065:Wastewater