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In situ methane enrichment systems, which consisted of a mesophilic kinetic phase separation digester coupled witha leachate recycle loop to an external CO2 stripper, were developed to upgrade biogas productivity. The effects of organicloading rate (OLR) and leachate recycle rate (LRR) on the resulting off-gas methane content, methane productivity, andtotal volatile solids (TVS) removal efficiency were quantitatively evaluated. The results indicated that an off-gas methanecontent of over 95.1% was achieved at the reactor OLR of 5 kgVS/m3-day and at an LRR of 4. Under these conditions,the methane productivity of the in situ methane enrichment system was 0.28 v/v-d (gas volume/reactor volume) of phaseI, 0.33 v/v-d of phase II, and the TVS removal efficiency was between 76%and 81%. A further increase in OLR of 10kgVS/m3-day reached a methane content of 88.3% at an LRR of 4. An increase in OLR requires more leachate recyclingto achieve higher methane content. However, an excessively high LRR led to a decrease in methane productivity andTVS removal efficiency.
