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Open AccessArticle

Removal of Pollutants from an AMD from a Coal Mine by Neutralization/Precipitation Followed by “In Vivo” Biosorption Step with the Microalgae Scenedesmus sp.

Laboratório de Tecnologia Mineral e Ambiental, Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais, Escola de Engenharia, Universidade Federal do Rio Grande do Sul, Porto Alegre 90040-060, Brasil
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Minerals 2020, 10(8), 711; https://doi.org/10.3390/min10080711
Received: 24 June 2020 / Revised: 30 July 2020 / Accepted: 4 August 2020 / Published: 12 August 2020
(This article belongs to the Special Issue Pollutants in Acid Mine Drainage)
This work evaluates the benefits of a complementary treatment step of acid mine drainage (AMD) using the algae Scenedesmus sp. in terms of algae biomass production, residual metal removal, and the toxicity of the discharged water. Conventional treatment by neutralization/precipitation of an AMD from a coal mine in Brazil was conducted with Ca(OH)2 at pH 8.7. Algal growth studies were performed in the treated AMD, with and without a nutrient supply. The raw effluent and treatments were compared in terms of residual concentration of metals and sulfate, conductivity, and toxicity with the Allium cepa and Daphnia magna test organisms. The results show that the conventional treatment allowed a major metal removal, reduction in the conductivity, and good indices in the toxicological parameters evaluated. The biosorption with in vivo microalgae improved the quality of the effluent for residual metals. No significant toxicity was observed to Allium cepa in all treatments performed, while the Daphnia magna test indicated a reduction in toxicity after the biosorption step. It was concluded that algae growth can be carried out in treated mine waters, providing algae biomass and helping to achieve the standards for water discharge. View Full-Text
Keywords: acid mine drainage; conventional treatment; biosorption; algae; metal removal; toxicity acid mine drainage; conventional treatment; biosorption; algae; metal removal; toxicity
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MDPI and ACS Style

Santos, K.B.d.; Almeida, V.O.d.; Weiler, J.; Schneider, I.A.H. Removal of Pollutants from an AMD from a Coal Mine by Neutralization/Precipitation Followed by “In Vivo” Biosorption Step with the Microalgae Scenedesmus sp. Minerals 2020, 10, 711. https://doi.org/10.3390/min10080711

AMA Style

Santos KBd, Almeida VOd, Weiler J, Schneider IAH. Removal of Pollutants from an AMD from a Coal Mine by Neutralization/Precipitation Followed by “In Vivo” Biosorption Step with the Microalgae Scenedesmus sp. Minerals. 2020; 10(8):711. https://doi.org/10.3390/min10080711

Chicago/Turabian Style

Santos, Karine B.d.; Almeida, Vítor O.d.; Weiler, Jéssica; Schneider, Ivo A.H. 2020. "Removal of Pollutants from an AMD from a Coal Mine by Neutralization/Precipitation Followed by “In Vivo” Biosorption Step with the Microalgae Scenedesmus sp." Minerals 10, no. 8: 711. https://doi.org/10.3390/min10080711

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