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Use of Bacterial Sulfate Reduction for Removing Nickel from Mine Waters.

Hammack-RW; Edenborn-HM
Ch 19 in Proceeds SME Symp Emerging Process Env Phoenix 2/24-27/92 SME Pp 141-147 :141-147
Experiments were done to determine if a mushroom compost-based sulfate reduction system could be used to treat nickel-contaminated mine waters. Sulfate reduction systems were established in columns containing acid-washed mushroom compost. Simulated mine waters containing 2,000 mg/l sulfate and 50 to 1,000 mg/l nickel were adjusted to ph 4.5 and pumped through the columns at flow rates between 15 and 25 ml/h. During the first 9 days of operation, virtually all influent nickel was removed in the columns by sorption and ion exchange mechanisms. The nickel removal rate then dropped to 18 to 30 mg ni/day (7.8 to 12.8 Nmol/g-substrate/day), probably due to low sulfate reduction rates. When sodium lactate was added to the inflow, a sustained and sevenfold increase in the nickel removal rate was observed. Results of this study indicate that bacterial sulfate reduction can effectively treat nickel concentrations up to 500 mg/l if labile carbon is nonlimiting.
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OP 207-92
NIOSH Division
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Ch. 19 in Proceeds SME Symp. Emerging Process ... Env. (Phoenix, 2/24-27/92). SME, Pp 141-147