Volume 13, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A study was undertaken to determine the efficiency with which three types of sewage treatment in Puerto Rico remove eggs of and . In the plants studied, primary sedimentation and decantation methods removed 35 to 74 percent of the 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 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 snails exposed to flowing effluent of the trickling filter and activated sludge plants acquired infections of .


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