STUDY OF THE EFFECT LEACHATE RECIRCULATION ON BIODEGRADATION RATE IN BIOREACTOR LANDFILL

• Main Author: Dellarosa, Luvy
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/70868
• Institution: Institut Teknologi Bandung

More than 30% of the entire amount of solid waste generated in Bandung City or 2,200 tons/day is transported to the TPA Sarimukti (Final Processing Site), exceeding the initially anticipated daily capacity of 1,200 tons (Surya, 2020). This goes against Presidential Regulation No. 97/2017, which places landfill at the bottom of the hierarchy. The breakdown of solid waste in landfill takes 30 – 50 years and has the potential to generate environmental issues including leachate contamination, landfill gas emissions, and disease vectors (Sanphoti et.al., 2006). Bioreactor landfill is reactor with microbiological processes that can speed up the decomposition of organic waste, accelerate the conversion of complex organic compounds, increase the efficiency of processes that may not happen in conventional landfills, and mitigate the potential negative effects of landfills on the environment and life (Warith, 2001). Bioreactor landfill in this study was run anaerobically for 138 days. The landfill bioreactor's solid waste generates leachate, which is used for recirculation. Leachate recirculation to enhance physical, chemical, and biological conditions, accelerating waste stabilization and biodegradation. Leachate, gas, and settlement parameters are used to estimate the rate of biodegradation in the landfill bioreactor. R1, R2, and R3 each had variances in leachate recirculation of 12%, 6%, and 0% of the reactor volume. Leachate recirculation of 12% (120 L/day) in R1 is believed to speed up biodegradation, as evidenced by a higher COD scavenging efficiency of 85.82% as compared to R2 (60L/day) of 77.87%. This is further confirmed by the measured percentage of settlement (reduction in waste surface) R1, which is 16.61%, in comparison to R2, which is 9.13%, and R3, which is 4.02%. However, R2 produces more methane gas (CH4) on average 0.034 L/days than R1 0.027 L/days. This is presumably due to the presence of an inhibitor in the form of higher O2 due to the leachate recirculation process in R1. In addition, it is also suspected that gas is difficult to escape into the atmosphere due to increasingly saturated conditions, which is reflected in vertical permeability. Leachate recirculation's impact on settlement and biodegradation rates (COD and methane parameters) will be determined by a MANOVA test with Minitab. The outcomes showed that leachate recirculation volume had an impact on the rate of biodegradation (methane and COD parameters) and settlement.