title: Autotrophic denitrification of nitrate and nitrite using thiosulfate as an electron donor.
abstract: This study was carried out to determine the possibility of autotrophic denitritation using thiosulfate as an electron donor, compare the kinetics of autotrophic denitrification and denitritation, and to study the effects of pH and sulfur/nitrogen (S/N) ratio on the denitrification rate of nitrite. Both nitrate and nitrite were removed by autotrophic denitrification using thiosulfate as an electron donor at concentrations up to 800 mg-N/L. Denitrification required a S/N ratio of 5.1 for complete denitrification, but denitritation was complete at a S/N ratio of 2.5, which indicated an electron donor cost savings of 50%. Also, pH during denitrification decreased but increased with nitrite, implying additional alkalinity savings. Finally, the highest specific substrate utilization rate of nitrite was slightly higher than that of nitrate reduction, and biomass yield for denitrification was relatively higher than that of denitritation, showing less sludge production and resulting in lower sludge handling costs.
authors.affiliation: R&D Center, Samsung Engineering Co. Ltd., Woncheon-Dong, Youngtong-Gu, Suwon, Gyeonggi-Do 443-823, Republic of Korea.
authors.forename: Jinwook
authors.initials: J
authors.lastname: Chung
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa-Dong, Ansan, Gyeonggi-Do 425-791, Republic of Korea.
authors.forename: Khurram
authors.initials: K
authors.lastname: Amin
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa-Dong, Ansan, Gyeonggi-Do 425-791, Republic of Korea.
authors.forename: Seungjin
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa-Dong, Ansan, Gyeonggi-Do 425-791, Republic of Korea.
authors.forename: Seungjoon
authors.initials: S
authors.lastname: Yoon
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa-Dong, Ansan, Gyeonggi-Do 425-791, Republic of Korea.
authors.forename: Kiwook
authors.initials: K
authors.lastname: Kwon
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa-Dong, Ansan, Gyeonggi-Do 425-791, Republic of Korea. Electronic address: wkbae@hanyang.ac.kr.
authors.forename: Wookeun
authors.initials: W
authors.lastname: Bae
mesh_terms: D052818:Autotrophic Processes; D018533:Biomass; D058440:Denitrification; D006863:Hydrogen-Ion Concentration; D009566:Nitrates / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism; D012722:Sewage; D013455:Sulfur / Q000737:chemistry; D013885:Thiosulfates / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D009566:Nitrates; D009573:Nitrites; D012722:Sewage; D013885:Thiosulfates; D013455:Sulfur; D009584:Nitrogen
keywords: Autotrophic denitrification; Denitritation; Shortcut biological nitrogen removal; Thiosulfate