Abstract
A co-digestion investigation was conducted using small-scale digesters in Costa Rica to optimize their ability to treat animal wastewater and produce renewable energy. Changes in methane production, wastewater pollutant reductions, and fertilizer utility were quantified when swine manure was co-digested with used cooking grease. The co-digestion experiments were conducted on 12 field-scale digesters using three replications of four treatment groups: the control (0%) and 2.5, 5, and 10 % used cooking grease (by volume) combined with swine manure.
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