Bacterial reduction of perchlorate and nitrate in water
- Univ. of California, Riverside, CA (United States). Dept. of Environmental Sciences
A bacterial isolate, strain perc1ace, was shown to reduce the ground water contaminant perchlorate (ClO{sub 4}{sup {minus}}) to levels < 0.005 mg L{sup {minus}1} when grown on acetate under anaerobic conditions. The ability of perc1ace to simultaneously reduce perchlorate and another ground water pollutant, nitrate (NO{sub 3}{sup {minus}}), was examined in batch studies and in a sand packed column under saturated flow conditions. Nitrate removal was monitored using ion chromatography, and perchlorate removal was monitored using a perchlorate specific electrode or ion chromatography, depending on the study. In batch studies, the reduction of 0.089, 0.92, 12.0, and 122 mg L{sup {minus}1} perchlorate was examined in the presence and absence of 62 mg L{sup {minus}1} NO{sub 3}{sup {minus}}. Perchlorate was reduced more rapidly in the absence of NO{sub 3}{sup {minus}} than in its presence. However, both perchlorate and NO{sub 3}{sup {minus}} were reduced by more than 10-fold within 48 h. A sand-packed column inoculated with perc1ace simulated a flow-through biotreatment system for water contaminated with a low level of perchlorate and a much higher level of NO{sub 3}{sup {minus}}. Biotreatment could reduce perchlorate to < 0.005 mg L{sup {minus}1} in a 3 h residence time. The addition of NO{sub 3}{sup {minus}} initially decreased the efficiency of perchlorate removal, however within 1 d the biotreatment system had adjusted such that there was complete removal of perchlorate and the reduction of NO{sub 3}{sup {minus}} to < 1 mg L{sup {minus}1}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 364040
- Journal Information:
- Journal of Environmental Quality, Vol. 28, Issue 3; Other Information: PBD: May-Jun 1999
- Country of Publication:
- United States
- Language:
- English
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