naa a22 4500 510749461 CHVBK 20180411083059.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11270-013-1690-2 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1690-2 The Application of MnO2 in the Removal of Manganese from Acid Mine Water [Elektronische Daten] [Alice Aguiar, Rute Duarte, Ana Ladeira] In recent years, much attention has been devoted in developing inexpensive or alternative systems for treating acid mine drainage (AMD). Manganese is a common component of AMD, and it is traditionally removed by precipitation. However, in order to meet the standard limits for discharging, usually <1mgL−1, it is necessary to raise the pH above 10 which implies in high consumption of reagents and a final pH that does not meet the required value for discharging. This study investigated the removal of manganese from an acid mine effluent and laboratory solutions by using an industrial residue consisted of manganese dioxide (MnO2). The pH of the acid effluent is around 2.7, and the manganese concentration is approximately 140mgL−1. Batch experiments assessed the influence of pH and the efficiency of manganese dioxide (MnO2) in the Mn+2 removal. In the presence of MnO2, the metal concentration meets the discharging limit at pH range of 6.8 to 7.2. Experiments carried out with columns packed with MnO2 assessed the influence of the flow rate on the process. Best results were obtained for columns fed with mine water neutralized with limestone at pH7.0 and a residence time of 3.3h. The maximum manganese loading capacity for MnO2 was around 14mgg−1. RAMAN spectroscopy showed that the MnO2 is essentially constituted of pyrolusite. In addition, the solid hausmannite (Mn3O4) was observed on the surface of the MnO2 residue after its contact with the Mn+2 solution. Springer Science+Business Media Dordrecht, 2013 Manganese oxide nationallicence Acid mine drainage nationallicence Raman spectroscopy nationallicence Columns experiments nationallicence Aguiar Alice Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut Duarte Rute Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut Ladeira Ana Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-8 0049-6979 224:9<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1690-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1690-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aguiar Alice Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut NATIONALLICENCE 700 1- Duarte Rute Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut NATIONALLICENCE 700 1- Ladeira Ana Center for the Development of Nuclear Technology (CDTN), Av. Antonio Carlos 6627, Campus da UFMG, Pampulha, 31270-901, Belo Horizonte, Brazil aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-8 0049-6979 224:9<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer