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REMOVAL OF ZINC FROM CIRCUM-NEUTRAL PH MINE-IMPACTED WATERS USING A NOVEL "HYBRID" LOW PH SULFIDOGENIC BIOREACTOR
Holanda, R. and D.B. Johnson.
Frontiers in Environmental Science 8: Article 22(2020)
A laboratory-scale, continuous-flow hybrid sulfidogenic bioreactor (HSB) was used to remediate synthetic and actual circum-neutral pH, Zn-contaminated water bodies from two abandoned metal mining sites. The reactor was fed zero-valent sulfur (ZVS) and sulfate potential electron acceptors and a glycerol potential electron donor. The bacterial consortium used in the reactor included several species of acid-tolerant bacteria that catalyze the dissimilatory reduction of both ZVS and sulfate and a novel acidophilic ZVS-reducing Firmicute. In both cases, >99% of Zn was removed from solution as ZnS using both in-line and off-line configurations. Both mine waters contained sufficient alkalinity to neutralize the generation of acidity resulting from ZnS formation. A potential scenario for full-scale treatment of one of the mine waters using an HSB is described. This article is Open Access at https://www.frontiersin.org/articles/10.3389/fenvs.2020.00022/full
Frontiers in Environmental Science 8: Article 22(2020)
A laboratory-scale, continuous-flow hybrid sulfidogenic bioreactor (HSB) was used to remediate synthetic and actual circum-neutral pH, Zn-contaminated water bodies from two abandoned metal mining sites. The reactor was fed zero-valent sulfur (ZVS) and sulfate potential electron acceptors and a glycerol potential electron donor. The bacterial consortium used in the reactor included several species of acid-tolerant bacteria that catalyze the dissimilatory reduction of both ZVS and sulfate and a novel acidophilic ZVS-reducing Firmicute. In both cases, >99% of Zn was removed from solution as ZnS using both in-line and off-line configurations. Both mine waters contained sufficient alkalinity to neutralize the generation of acidity resulting from ZnS formation. A potential scenario for full-scale treatment of one of the mine waters using an HSB is described. This article is Open Access at https://www.frontiersin.org/articles/10.3389/fenvs.2020.00022/full
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