The Mixing Speed Effect and Mass of Adsorbent On Copper (Cu) Removal from Wastewater by Water Hyacinth LeavesMala Oktaviyana Lussa, Asih Wijayanti, Riana Ayu Kusumadewi and Rositayanti HadisoebrotoE3S Web Conf., 148 (2020) 05006DOI: https://doi.org/10.1051/e3sconf/202014805006