Kinetics of biological perchlorate reduction and pH effect

Chao Wang, Lee Lippincott, Xiaoguang Meng

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

Batch experiments were conducted to investigate the kinetics of perchlorate reduction by heterotrophic and mixed perchlorate-reducing bacteria. Substrate-utilizing and cellular maintenance models were employed to fit the experimental data for microbial perchlorate reduction. The half saturation constant, Ks, obtained in this study was below 0.1 mg/L, which indicated that perchlorate-reducing bacteria are effective at utilizing low concentrations of perchlorate. The effect of pH on the kinetics of microbial perchlorate reduction was also studied. Perchlorate reduction occurred throughout the pH range from 5.0 to 9.0. Nevertheless, the rates of perchlorate removal by a unit mass of bacteria were significantly different at various pHs with a maximum rate at pH 7.0. The variation of qmax with pH was described well with a Gaussian peak equation. This equation is expected to be applicable for practical purposes when pH effects need to be considered.

Original languageEnglish
Pages (from-to)663-669
Number of pages7
JournalJournal of Hazardous Materials
Volume153
Issue number1-2
DOIs
StatePublished - 1 May 2008

Keywords

  • Biological reduction
  • Kinetics
  • Perchlorate
  • pH effect

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