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Effect of reactive media composition and co-contaminants on sulfur-based autotrophic denitrification
Cited 51 time in
Web of Science
Cited 63 time in Scopus
- Authors
- Issue Date
- 2006-12
- Publisher
- Elsevier
- Citation
- Environmental Pollution 144, 802-807
- Keywords
- Autotrophic denitrification ; Sulfur granule size ; TCE ; Heavy metals ; Volume ratio of sulfur to limestone
- 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 turn, 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. (c) 2006 Elsevier Ltd. All rights reserved.
- ISSN
- 0269-7491
- Language
- English
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