Documents disponibles écrits par cet auteur

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

Phytomining / V. Sheoran in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1007–1019 Titre : Phytomining : A review Type de document : texte imprimé Auteurs : V. Sheoran, Auteur ; A.S. Sheoran, Auteur ; P. Poonia, Auteur Année de publication : 2009 Article en page(s) : pp. 1007–1019 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mining  Pollution  Reclamation  Wasteprocessing  Precious  metal  ores Résumé : Bioharvesting of metals from high biomass crops grown in soil substrates particularly those associated with sub-economic mineralization is termed phytomining. It is a recent more advanced technology of phytoremediation to produce low volume, sulphide-free ‘bio-ore’, which can either be safely disposed of or, if the target metal is of sufficient economic value, smelted, and recovered. This technology has potential application in the mineral industry to return an economic profit by commercial production of metals via cropping. Numerous sites across the globe are enriched with metals that could potentially be phytomined. In recent years major scientific progress has been made in understanding the potential for application of this herbage-based technique in the mining industry to develop a good relationship between the industry and community. This paper reviews various aspects of phytomining along with the advantages, limitations, and future feasibility of the technology. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900106X [article] Phytomining : A review [texte imprimé] / V. Sheoran, Auteur ; A.S. Sheoran, Auteur ; P. Poonia, Auteur . - 2009 . - pp. 1007–1019. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1007–1019 Mots-clés : Mining  Pollution  Reclamation  Wasteprocessing  Precious  metal  ores Résumé : Bioharvesting of metals from high biomass crops grown in soil substrates particularly those associated with sub-economic mineralization is termed phytomining. It is a recent more advanced technology of phytoremediation to produce low volume, sulphide-free ‘bio-ore’, which can either be safely disposed of or, if the target metal is of sufficient economic value, smelted, and recovered. This technology has potential application in the mineral industry to return an economic profit by commercial production of metals via cropping. Numerous sites across the globe are enriched with metals that could potentially be phytomined. In recent years major scientific progress has been made in understanding the potential for application of this herbage-based technique in the mining industry to develop a good relationship between the industry and community. This paper reviews various aspects of phytomining along with the advantages, limitations, and future feasibility of the technology. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900106X