NILAI EKONOMI PEMANFAATAN LIMBAH KELAPA SAWIT MENUJU ZERO WASTE PRODUCTION Muhammad Arief Dirgantoro, ROBIATUL ADAWIYAH BioWallacea : Jurnal Penelitian Biologi (Journal of Biological Research) Vol. 5 No. 2 2019 DOI 10.33772/biowallacea.v5i2.5875