Publications

Environmental pollution caused by petroleum exploitation activities can easily occur. Pollution that occurs includes, destruction of nutrient content in the soil, polluted ground water and air. The most harmful effect is ground water becoming toxic and unfit for consumption because it contains benzene, toluene and xylene (BTX) compounds. The Decree of the Minister of Environment no. 128 of 2003 stipulates rules regarding the procedures and technical requirements for waste and soil treatment contaminated by petroleum using biological methods. Previous research (Maria Assumpta, 2017) discusses the bioremediation of BTX compounds by the addition of 17.5% concentration of Bacillus cereus, Pseudomonas putida and Rhodococcus erythropolis on contaminated soil in Pertamina Petrochina East Java (PPEJ) Bojonegoro field producing from the Ngrayong Formation. The initial concentration of BTX compounds on that field were: benzene 26.44 ppm, toluene 121 ppm, and xylene109 ppm. After bioremediation these levels fell to: benzene 0.489 ppm, toluene 0.726 ppm and xylene 3.45 ppm. These values are below the maximum limits that have been decreed. Based on analysis of the percentage of hydrocarbon component, oil phase diagram, API, oil density, initial formation volume factor (Boi) and gas gravity obtained there is a similarity between oil from PT. PPEJ Bojonegoro Field (Ngrayong Formation) with oil at Wonocolo Field (Wonocolo Formation). Both oils are light oils with API gravity of 31.4 – 32.27°API and also similar values of oil density (53.93 –54.2 lb/ft3). The hypothesis is the biodegradation of BTX compounds carried out on contaminated soil on PT. PPEJ Bojonegoro Field by adding 17.5% concentration of Bacillus cereus aerobic bacteria, Pseudomonas putida, and Rhodococcus erythropolis can also give similar results when applied to Traditional Wonocolo Oil Field. This is expected to have a positive impact on the environment around Wonocolo Field.