Design of Rotary Dryer for Sand Drying using Biomass Energy Sources Herry Susanto, Roy Hendroko Setyobudi, Didik Sugiyanto, Yefri Chan, Erkata Yandri, Satriyo Krido Wahono, Kamaruddin Abdullah, Juris Burlakovs, Wahyu Widodo, Yogo Adhi Nugroho and Abubakar Yaro E3S Web Conf., 226 (2021) 00024 Published online: 05 January 2021 DOI: 10.1051/e3sconf/202122600024