Abstract
Rendering wastewater was anaerobically digested in an upflow anaerobic sludge blanket (UASB) digester in 11 trials spanning 11 months. The UASB digester influent was 2% blood/98% condensate for six of the trials (phase one) and 56% wash-up water/44% cooker condensate for the other five trials (phase two). The influent chemical oxygen demand (COD) for both phases was 5300 mg/l. The only parameter varied within phases was hydraulic retention time (HRT) which was varied from 5·2 to 15·6 days; however, changing HRT caused loading rate to change because the influent strength was held constant. COD removal efficiencies for phase one ranged from 28 to 72% and for phase two, from 72 to 87%. The biogas production from all trials contained over 75% methane and had traces of hydrogen sulfide. The production of methane was 0·2–0·25 l/gCOD converted in phase one and 0·28–0·34 l/gCOD converted in phase two.
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