ERRATUM: Start-Up, Adjustment and Long-Term Performance of a Two-Stage Bioremediation Process, Treating Real Acid Mine Drainage, Coupled with Biosynthesis of Zns Nanoparticles and Zns/Tio2 Nanocomposites (Minerals Engineering (2015) 75 (85-93) Doi: 10.1016/J.mineng.2014.12.003)