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Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes / A.S. Sheoran in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1073–1100 Titre : Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes : A review Type de document : texte imprimé Auteurs : A.S. Sheoran, Auteur ; V. Sheoran, Auteur ; R. P. Choudhary, Auteur Année de publication : 2011 Article en page(s) : pp. 1073–1100 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mining  Sulphide  ores  Acid-rock  drainage  Reclamation  Bacteria Résumé : Acid-rock drainage (ARD) is a widespread environmental problem that causes adverse effects to the quality of ground water and surface water through acidification, high concentration of the iron, sulphate, and elevated levels of soluble toxic metals. Active treatment technologies are often expensive and require regular attention resulting in increased overall costs due to operation and maintenance expenses. One of the effective treatment methods is to use sulphate-reducing prokaryotes (SRP) in bioreactors. They offer advantages such as high metal removal at low pH, stable sludge, very low operation costs, and minimal energy consumption. Sulphide precipitation is the desired mechanism of contaminant removal; however, many mechanisms including adsorption and precipitation of metal carbonates and hydroxides also occur in passive bioreactors. Several factors influencing the performance of the bioreactors are reviewed. The fundamental biochemical and microbiological reactions that occurs in the bioreactors has been dealt in detail. The present review presents performance of bioreactors, chemical characterisation of organic substrates for successful treatment of ARD. Moreover, design parameters, longevity and future scope of the study on bioreactors is also discussed in this review. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001664 [article] Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes : A review [texte imprimé] / A.S. Sheoran, Auteur ; V. Sheoran, Auteur ; R. P. Choudhary, Auteur . - 2011 . - pp. 1073–1100. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1073–1100 Mots-clés : Mining  Sulphide  ores  Acid-rock  drainage  Reclamation  Bacteria Résumé : Acid-rock drainage (ARD) is a widespread environmental problem that causes adverse effects to the quality of ground water and surface water through acidification, high concentration of the iron, sulphate, and elevated levels of soluble toxic metals. Active treatment technologies are often expensive and require regular attention resulting in increased overall costs due to operation and maintenance expenses. One of the effective treatment methods is to use sulphate-reducing prokaryotes (SRP) in bioreactors. They offer advantages such as high metal removal at low pH, stable sludge, very low operation costs, and minimal energy consumption. Sulphide precipitation is the desired mechanism of contaminant removal; however, many mechanisms including adsorption and precipitation of metal carbonates and hydroxides also occur in passive bioreactors. Several factors influencing the performance of the bioreactors are reviewed. The fundamental biochemical and microbiological reactions that occurs in the bioreactors has been dealt in detail. The present review presents performance of bioreactors, chemical characterisation of organic substrates for successful treatment of ARD. Moreover, design parameters, longevity and future scope of the study on bioreactors is also discussed in this review. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001664