The biogas upgrading from landfill leachate pretreated with low-frequency ultrasonic: anaerobic digestion performances and energy balance.

3 a,b two-step trend was observed for sCOD and TVFA variation during the ultrasonic pretreatment; the sCOD experienced an increasing trend within the first 10 min and the highest sCOD was measured at 10 min (14,380 mg/L).

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As the landfill age increases, the BOD/COD as the biodegradable index of LL experienced a decreasing trend and LL are difficult to deal with conventional treatment process.

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