Pilot‐scale digestion of pig slurry supernatant using an upflow anaerobic filter

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Abstract
Pig slurry supernatant was digested using an upflow anaerobic filter containing a polypropylene support material. The results obtained show that screened or gravity‐settled pig slurry is effectively digested at high loading rates and short hydraulic retention times in upflow filters. Stable performance of the filter was noted despite transient organic and hydraulic overloading. The attached biofilm on the plastic support material was shown to comprise a major fraction of the active bicmass within the reactor.