Cr(VI) and Dye Biosorption in Batik Wastewater using Biosorbent in The Tea BagLestari Sri, Sudarmadji, Djalal Tandjung Shilahuddin and Juari Santosa SriE3S Web Conf., 73 (2018) 05011DOI: https://doi.org/10.1051/e3sconf/20187305011