Abstract
A technique for mapping the three-dimensional performance of secondary treatment systems and for studying the behavior of specific compounds in-situ is described. [14C]Oleic acid was added to samples collected from various locations in the system. Each mixture was placed in a vial capped at both ends with semipermeable membranes, returned to its original position in the lagoon, and then retrieved after 1 day. The amount of radioactivity remaining, after cor rection for leakage and nonbiological losses, is a measure of biological activity. The approach revealed that water-column biodegradation was only one of many pathways for oleic acid removal, with sorption to solids also being important and, perhaps, dominant. Furthermore, it rationalized performance differences between an AST (activated sludge treatment) system and an ASB (aerated stabilization basin).
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