Abstract
Landfilling is one of the primary techniques utilized
globally to manage municipal solid waste (MSW), particularly in
developing nations. Unlike existing conventional methods, hybrid
bioreactor landfilling technology is a promising sustainable
approach for maximizing biogas production from MSW. This
study aimed to evaluate the application of hybrid bioreactor
technology to enhance biogas production from the organic fraction
of MSW. Over a 7-month period, two columns were utilized to
simulate typical (Br-1) and hybrid (Br-2) landfill bioreactors while
monitoring the quality of leachate and biogas generated. Results
showed contaminant reduction in leachate with the pH increasing
to 8 in Br-2, while Br-1 remained acidic below 7. Physicochemical
parameter reductions ranged from 33 to 98%, while total organic carbon and carbon oxygen demand (TOC/COD) ratio varied
between 0.04 and 0.61. Analyzed heavy metals reductions ranged from 3 to 88%. Biogas generated was 8.75 L with methane (CH4)
below 50% in Br-1, while Br-2 produced 21.5 L with CH4 exceeding 60%. The final CH4 concentration reached 67% in Br-2 and 52%
in Br-1. Partial aeration and diluted leachate recirculation enhanced biodegradation in Br-2 while the leachate was treated in situ.
The high CH4 content and 41-fold greater biogas yield in Br-2 showed the economic and ecological viability of this method for
biogas-to-energy projects.