Sludge Accumulation in Two Anaerobic/Facultative Lagoons Treating Swine Manure from Breeding Farms in Oklahoma

摘要

Sludge stage and volume were monitored in two lagoons (OK1 and OK2) treating manure from swine breeding farms for a period of 9 years. Solids management differed between the two lagoons. Sludge was left relatively undisturbed in lagoon OK1, whereas solids were removed with each irrigation in lagoon OK2. When left undisturbed, sludge accumulated in a pattern consistent with the complex accumulation model proposed by earlier researchers. Sludge accumulated faster when solids were removed during irrigation compared to the lagoon in which solids were left undisturbed. Accumulation in both disturbed and undisturbed lagoons occurred at a rate less than current ASABE and NRCS standards. Onset of rapid accumulation appears to be related to volumetric organic loading rate rather than separation distance between top of the sludge and the liquid surface. Critical organic loading rates contained in the current standards appear to be adequate to determine the onset of rapid sludge accumulation