Raharjo, S. W.; Wikandari, P. R. 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. UJC 2013, 2.