Investigations of Landfill Leachate Treatment Using Membrane Bioreactor in Different Configurations

This study investigates the treatment of landfill leachate, a hazardous liquid byproduct of municipal solid waste (MSW) landfills, with a focus on assessing the performance of a membrane bioreactor (MBR). The research aims to answer key research questions related to leachate characteristics, optimal MBR design, efficient contaminant removal, and the development of a mathematical model t simulate and optimize MBR performance. Leachate samples from various landfill sites in Sri Lanka were characterized, and an Anoxic-Aerobic MBR configuration with a Sludge Retention Time (SRT) of 60 days and a Hydraulic Retention Time (HRT) of 24 hours was identified as the optimal operating condition. The study conducted a comprehensive laboratory-scale model experiment, analyzing samples over 351 days and evaluating key parameters such as COD, BOD5, MLSS, TN, membrane resistance, and trans-membrane pressure. The developed mathematical model based on the Activated Sludge Model 1 (ASM1) accurately predicted the MBR's long-term performance, considering variables such as COD, MLSS, TN, total membrane resistance, and trans-membrane pressure. The study emphasizes the need for further research to improve the modeling accuracy. In summary, this research provides insights into landfill leachate treatment, showcasing the effectiveness of an MBR and the potential for future advancements in modeling accuracy and treatment optimization.