Nitrate-contaminated groundwater remediation by combined autotrophic and heterotrophic denitrification for sulfate and pH control: Batch tests

Naveed Ahmed Qambrani, Suk Hee Jung, Yong Sik Ok, Yong Seong Kim, Sang Eun Oh

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Groundwater remediation was evaluated for combined autotrophic and heterotrophic denitrification under high (154 mg/L as CaCO3) and low (95 mg/L as CaCO3) alkaline conditions. Two levels of acetate (47 and 94 mg/L) and ethanol (24 and 48 mg/L) were added to the reactors. Obtained denitrification rates were 2.89, 2.58, 3.55, 1.96, and 2.0 mg-N/L · h for high alkaline conditions, whereas under low alkaline conditions has given 2.36, 1.94, 2.47, 2.74, and 2.29 mg-N/L · h for control, 47 and 94 mg/L acetate, and 24 and 48 mg/L ethanol, respectively. Nitrite was accumulated for controls but reactors with acetate and ethanol did not accumulate nitrite. Acetate and ethanol addition decreased sulfate to nitrate ratios in the range of 4.5-7.58 for high alkaline conditions (12.77 for control) and 4.43-6.78 for low alkaline conditions (7.90 for control). Acetate was more efficient compared with ethanol in controlling sulfate production and pH maintenance.

Original languageEnglish
Pages (from-to)9084-9091
Number of pages8
JournalEnvironmental Science and Pollution Research
Volume20
Issue number12
DOIs
Publication statusPublished - 2013

Keywords

  • Denitrification
  • Ethanol
  • Groundwater
  • Sodium acetate
  • Sulfur-utilizing autotrophic denitrification

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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