Preprint Review Version 1 This version is not peer-reviewed

Acid Rock Drainage or Not—Oxidative vs. Reductive Biofilms—A Microbial Question

Version 1 : Received: 8 February 2018 / Approved: 8 February 2018 / Online: 8 February 2018 (15:35:56 CET)

A peer-reviewed article of this Preprint also exists.

Kalin, M.; Wheeler, W.N.; Bellenberg, S. Acid Rock Drainage or Not—Oxidative vs. Reductive Biofilms—A Microbial Question. Minerals 2018, 8, 199. Kalin, M.; Wheeler, W.N.; Bellenberg, S. Acid Rock Drainage or Not—Oxidative vs. Reductive Biofilms—A Microbial Question. Minerals 2018, 8, 199.

Journal reference: Minerals 2018, 8, 199
DOI: 10.3390/min8050199

Abstract

Abstract: Measures to counteract AMD generation need to start at the mineral surface, inhibiting mineral-oxidizing, acidophilic microbes. Laboratory and long-term field tests with pyrite-containing mining wastes, where Carbonaceous Phosphate Mining Waste (CPMW) was added, resulted in low acidity, and near neutral drainage. The effect was reproducible, nd confirmed by several independent research groups. This was shown to involve an organic coating, likely a biofilm. The biofilm formation was confirmed when CPMW was added to lignite coal waste with an initial pH of 1. Forty five days after the addition, the coal waste was dominated by heterotrophic microorganisms in biofilms. A review of the scientific literature supports that CPMW has physical and chemical characteristics which are capable of inducing a strong inhibitory effect on sulphide oxidation by forming an organic coating over the mineral surface. CPMW characteristics appear to provide the cornerstone of a new technology for the reduction of sulphide oxidation in mine wastes. An hypothesis for testing this technology is presented which could result in an economical and sustainable approach to mine waste and water management.

Subject Areas

microbial sulphide oxidation, corrosion, mine waste and water remediation, biofilm development, inhibition of Acid mine and rock draiange

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