title: Fabrication of novel oxygen-releasing alginate beads as an efficient oxygen carrier for the enhancement of aerobic bioremediation of 1,4-dioxane contaminated groundwater.
abstract: Oxygen-releasing alginate beads (ORABs), a new concept of oxygen-releasing compounds (ORCs) designed to overcome some limitations regarding the fast oxygen release rate and the high pH equilibrium of ORCs, were fabricated to promote the stimulation of aerobic biodegradation in anaerobic groundwater. Slow oxygen-releasing rate and maintenance of constant pH were achieved by changing the parameters (ionic radius and valence) related to the cross-linking ions composing ORABs, and the best results were obtained for ORABs cross-linked with Al (Al-ORABs). Furthermore, the mechanism of the improved aerobic biodegradation using Al-ORABs under oxygen-limiting groundwater conditions was elucidated in batch and column studies with 1,4-dioxane and Mycrobacterium sp. PH-06 as a model contaminant and aerobic microbes, respectively. Maximum 1,4-dioxane degradations of 99% and 68.1% were achieved when Al-ORABs were applied in batch and column conditions, respectively, whereas 34.3% and 18% of 1,4-dioxane were degraded without Al-ORABs in batch and column conditions, respectively.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
authors.forename: Chung-Seop
authors.initials: CS
authors.lastname: Lee
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
authors.forename: Thao
authors.initials: T
authors.lastname: Le Thanh
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
authors.forename: Eun-Ju
authors.initials: EJ
authors.lastname: Kim
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea.
authors.forename: Jianyu
authors.initials: J
authors.lastname: Gong
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Chang
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea. Electronic address: yschang@postech.ac.kr.
authors.forename: Yoon-Seok
authors.initials: YS
authors.lastname: Chang
mesh_terms: D000464:Alginates / Q000138:chemical synthesis* / Q000737:chemistry; D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004146:Dioxanes / Q000032:analysis*; D020723:Glucuronic Acid / Q000138:chemical synthesis / Q000737:chemistry; D060587:Groundwater / Q000737:chemistry*; D006603:Hexuronic Acids / Q000138:chemical synthesis / Q000737:chemistry; D008863:Microspheres; D010100:Oxygen / Q000737:chemistry* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000464:Alginates; D004146:Dioxanes; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D020723:Glucuronic Acid; C025223:1,4-dioxane; D010100:Oxygen
keywords: 1,4-Dioxane; Alginate bead; Bioremediation; Mycobacterium sp. PH-06; Oxygen release