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2 Journal of Ecological Engineering

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Biodegradation of Crude Oil Spill Using Bacillus Subtilis and Pseudomonas Putida in Sequencing Method

100%

Titah H. S. , Pratikno H. , Purwanti I. F. , Wardhani W. K.

Journal of Ecological Engineering

2021

tom Vol. 22, nr 11

157--167

Crude oil, otherwise called petroleum, occurs naturally as a complex organic mixture underneath the subsurface. The activities related to its exploration, production, refining, storage and distribution are mostly accompanied with extreme pollution and other hazardous conditions. For these reasons, the need to critically devise the best possible solutions becomes paramount, particularly as regards oil spills. Therefore, the purpose of this research was to determine the efficiency of TPH removal in crude oil using Bacillus Subtilis and Pseudomonas Putida. The sequencing method was applied in a laboratory scale and under artificial seawater media conditions. The total petroleum hydrocarbon (TPH) serves as a significant parameter in detecting crude oil, although the extraction and analysis were conducted with the use of a separator funnel and gas chromatography mass spectrometry (GCMS), respectively. In addition, the simulated seawater media was described as the mineral salt medium (MSM), with 33% salinity. Moreover, five reactors were also employed, including K for control, B for B. subtilis, P for P. putida, BP for B. subtilis and P. putida sequence and PB for P. putida and B. subtilis sequence. The entire treatments obtained the access to two replicate reactors. Furthermore, the bacteria inoculum and crude oil concentration in each unit were estimated at 5% and 10% (v/v), respectively. The results achieved the maximum TPH removal at 66.29% in the PB reactor after 35 days. On the basis of ANOVA reports, no significant variation was observed between the sequential additions of a single bacterial treatment and consortium microbes. In summary, two bacterial species demonstrated high potential to degrade TPH, but predicted an increase in the break down time, as the nutrient or oxygen tends to accelerate the process.

Determination of Minimum Inhibitory Concentration of Chromium and Salinity on Chlorella vulgaris

88%

Maysitha A. D. , Titah H. S. , Pratikno H. , Wardhani W. K. , Dienullah R. M. A.

tom Vol. 25, nr 8

130--140

Heavy metal pollution, particularly chromium (VI) contamination, is a significant issue in Indonesian waters due to numerous chromium-producing industries. Research conducted in the downstream waters of Wonorejo found Cr(VI) levels ranging from 0.0025 to 0.018 mg/L, exceeding Indonesia’s quality standard of 0.002 mg/L. Thus, it is crucial to treat industrial wastewater containing Cr(VI) before disposal into water bodies. One alternative for treating Cr(VI) waste is using biological agents like microalgae. Chlorella sp. was chosen for this study due to its abundance in Indonesian waters. The study aims to determine the minimum inhibitory concentration (MIC) of Chlorella vulgaris against Cr(VI) and salinity variations. The research involved propagating the microalgae to analyze growth rates and conducting MIC tests against salinity for 14 days with variations of 0, 20, 30, and 40 ppt. MIC tests against Cr(VI) were then performed using the optimal salinity (20 ppt) with variations of 0, 5, 10, 20, 30, and 40 mg/L. Results showed that C. vulgaris can thrive in salinities up to 40 ppt, with the optimal salinity being 20 ppt. The optimal Cr(VI) concentration for growth was 5 mg/L, resulting in a growth rate of 1.17 cells/mL/day. Based on statistical analysis only concentration of Cr(VI) that affected C. vulgaris cell density and not the salinity.