Combination of Coagulation-flocculation and Ultrafiltration Processes using Cellulose Acetate Membrane for Wastewater Treatment of Tofu IndustrySinta Sofiana Putri and Sutrasno KartohardjonoE3S Web Conf., 67 (2018) 04005DOI: https://doi.org/10.1051/e3sconf/20186704005