REMEDIATION OF WEATHERED PETROLEUM HYDROCARBON-CONTAMINATED SOIL USING BIOELECTROKINETIC TECHNOLOGY

• Main Author: Nadhifah Syarif, Afiya
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/77779
• Institution: Institut Teknologi Bandung

Electrokinetic remediation (EKR) employs electric voltage to recover oilcontaminated soils. In a laboratory-scale study, EKR was conducted for 8, 16, and 24 hours. A 0.05 M Na2SO4 solution served as an electrolyte to enhance soil conductivity. Biostimulation was integrated with EKR, and the levels of total petroleum hydrocarbons (TPH) and microbial colonies (TPC) were assessed over a 4-week period. The findings revealed that the most effective EKR duration was 24 hours, achieving a removal rate of 87.9%. The 16-hour duration followed closely at 85.7%, while the 8-hour duration exhibited a lower effectiveness of 62.5%. During the fourth week, TPC counts increased for the 16-hour and 24-hour durations but decreased for the 8-hour duration. The gradual decline in TPH levels post-EKR indicated the positive impact of electroosmotic flow on enhancing TPH desorption and biodegradation. To ensure optimal biodegradation, temperature, pH, and water content are maintained within the recommended range of 25-40°C, pH 6-8, and 30-60% water content. The observed water content and electroosmotic flow volume (EOF) confirmed the occurrence of electroosmosis across all three durations. The 24-hour duration exhibited the highest proportion of EOF in the cathode chamber at 22.2%, followed by 16 hours at 16.1% and 8 hours at 8.6%. The process of electrokinetic bioremediation for a duration of 24 hours, utilizing NPK and a 0.05 M phosphate buffer solution, yielded the highest colony count of 16,888,889 CFU/gr on the 28th day. The introduction of the 0.05 M phosphate buffer solution proved to be efficacious in maintaining the soil pH during the culmination of the remediation process.