Raharjo, Sun’am Widiyo, and Prima Retno Wikandari. 2013. “PENGARUH PENAMBAHAN CaO DAN LAMA INTERAKSI TERHADAP KUALITAS AIR LIMBAH SULPHUR RECOVERY UNIT DI JOINT OPERATING BODY PERTAMINA- PETROCHINA EAST JAVA-TUBAN (EFFECT OF CAO ADDITION AND INTERACTION TIME TO QULITIES OF WASTE SULPHUR RECOVERY UNIT JOINT OPE”. Unesa Journal of Chemistry 2 (3). https://doi.org/10.26740/ujc.v2n3.p%p.