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Sewage Treatment and Schistosome Eggs

A study was undertaken to determine the efficiency with which three types of sewage treatment in Puerto Rico remove eggs of Schistosoma mansoni and Ascaris lumbricoides. In the plants studied, primary sedimentation and decantation methods removed 35 to 74 percent of the Ascaris eggs and 83 percent of the schistosome eggs. Trickling filter and activated sludge plants removed, respectively, 94.7 to 99.8 and 97.0 to 100 percent of the Ascaris eggs and 99.7 and 99.7 percent of schistosome eggs. Throughout the study the plants functioned properly, as determined by suspended solids and BOD tests. None of 3,967 laboratory-raised Australorbis glabratus snails exposed to flowing effluent of the trickling filter and activated sludge plants acquired infections of S. mansoni.

^* Present address: Department of Zoology, Montana State University, Missoula, Montana.