EXAMINATION OF HOUSEHOLD WASTEWATER FROM OFFICES OF THE OIL AND GAS INDUSTRY IN MUDI FIELD, TUBAN INDONESIA

Office activities in the oil and gas industry in Tuban East Java, produce domestic wastewater. The wastewater is connected to the waters around the offices. It is necessary to test whether the waste water that comes out of the oil and gas industry office meets the processing standards, so that it can be channeled into the river. This study aims to determine the quality of domestic wastewater at the inlet and outlet sections of the oil and gas industry offices in Mudi Field and possible alternative domestic wastewater treatment systems. The research was conducted by taking samples at the inlet and outlet of office domestic waste. The sample was then tested for 7 parameters namely pH, BOD, COD, ammonia, oil and grease, TSS, and total coliform. The parameters used are based on Permen LHK No. 68 of 2016 concerning the quality of domestic wastewater. The results showed that the pH value at the inlet was 7.84 and 7.8 at the outlet. The BOD value at the inlet was 33.65 mg/L and the outlet was 5.73 mg/L. The COD value at the inlet was 55.95 mg/L and the outlet was 28.42 mg/L. The TSS value at the inlet is 13 mg/L and the outlet is 13 mg/L. The value of fats and oils at the inlet is 1.6 mg/L and the outlet is 1.6 mg/L. The ammonia value at the inlet was 1.42 mg/L and the outlet was 5.83 mg/L. The total coliform value at the inlet was 3/100 mL and the outlet was 460/mL. Based on the results of laboratory tests compared to permitted water quality standards, the quality of domestic wastewater at the offices of the oil and gas industry in the Mudi Field still meets the quality standards. Meanwhile, an alternative system for treating domestic wastewater from offices in Mudi Field apart from filtration is a biological method namely using photosynthetic bacteria (PSB).