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  • Title: Semi-continuous anaerobic co-digestion of thickened waste activated sludge and fat, oil and grease.
    Author: Wan C, Zhou Q, Fu G, Li Y.
    Journal: Waste Manag; 2011 Aug; 31(8):1752-8. PubMed ID: 21546236.
    Abstract:
    Co-digestion of thickened waste activated sludge (TWAS) and fat, oil and grease (FOG) was conducted semi-continuously under mesophilic conditions. The results showed that daily methane yield at the steady state was 598L/kg VS(added) when TWAS and FOG (64% of total VS) were co-digested, which was 137% higher than that obtained from digestion of TWAS alone. The biogas composition was stabilized at a CH(4) and CO(2) content of 66.8% and 29.5%, respectively. Micronutrients added to co-digestion did not improve the biogas production and digestion stabilization. With a higher addition of FOG (74% of total VS), the digester initially failed but was slowly self-recovered; however, the methane yield was only about 50% of a healthy reactor with the same organic loading rate.
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