THE EFFECT OF MOLASSES BIOSTIMULATION ON PERTAMINA BALONGAN OIL SLUDGE BIODEGRADATION USING BIOSLURRY REACTORWiwit Sri Yuliastuti, Aziz Purnomo Hakim, Nadia Safira, Agus Supriyanto, Fatimah, Hanif Yuliani3, and Ni’matuzahroh
Oil sludge is the largest oil waste in Indonesia that is accommodated in various oil companies. Oil sludge contains hydrocarbon compounds such as benzene, toluene, ethylbenzene and xylene (BTEX), and contains metal elements such as Hg, Cd, Ag, Ni, Pb, As, Cr, Sn, Zn and falls into the category of hazardous and toxic wastes (B3). The research aimed to determine the effect of biostimulation of molasses on residual levels of oil sludge TPH (ppm), TPC (CFU/mL), and pH and the best value of each treatment in the biodegradation process by using a bioslurry reactor. pH measurements were carried out using universal pH or paper pH, TPH measurements using the gravimetric method, and measurement of total microbial counts with TPC (CFU/mL). The results showed that the biostimulation of molasses had an effect on reducing oil sludge weight (ppm), total microbial count (CFU/mL) and pH. The best combination was found in DH21 treatment (molasses concentration was added 2% (v/v) for 21 days incubation) with the final residual 209 Â± 92 ppm and the average of biodegradation percentage was 73.8%.