title: Effect of reactive media composition and co-contaminants on sulfur-based autotrophic denitrification.
abstract: As a part of a study developing a biological reactive barrier system to treat nitrate-contaminated groundwater, the effects of reactive media composition and co-contaminants on sulfur-oxidizing autotrophic denitrification were investigated. The size of sulfur granules affected the denitrification rates; kinetic constants of 2.883, 2.949, and 0.677 mg-N(1/2)/L(1/2)/day were obtained when the granule sizes were below 2 mm, between 2 and 5 mm, and over 5 mm, respectively. When the volume ratios of sulfur to limestone were 1:1, 2:1, 3:1, and 4:1, kinetic constants of 5.490, 3.903, 4.072, and 2.984 mg-N(1/2)/L(1/2)/day were obtained, respectively. The presence of TCE up to 20 mg/L didn't significantly affect nitrate removal efficiency. At the TCE concentration of 80 mg/L, however, nitrate removal was markedly inhibited. Also, Zn and Cu inhibited the denitrification activity at more than 0.5 mg/L of concentration whereas Cr (VI) did not significantly affect the nitrate removal efficiency at all levels tested.
authors.affiliation: School of Civil, Urban & Geosystem Engineering, College of Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Hee Sun
authors.initials: HS
authors.lastname: Moon
authors.forename: Sun Woo
authors.initials: SW
authors.lastname: Chang
authors.forename: Kyoungphile
authors.initials: K
authors.lastname: Nam
authors.forename: Jaewan
authors.initials: J
authors.lastname: Choe
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Kim
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002119:Calcium Carbonate; D003470:Culture Media; D006801:Humans; D007220:Industrial Waste; D007723:Korea; D019216:Metals, Heavy; D009566:Nitrates; D010316:Particle Size; D013455:Sulfur; D016999:Sulfur-Reducing Bacteria; D014874:Water Pollutants, Chemical
chemical_list: D003470:Culture Media; D007220:Industrial Waste; D019216:Metals, Heavy; D009566:Nitrates; D014874:Water Pollutants, Chemical; D013455:Sulfur; D002119:Calcium Carbonate