Abstract
The role of insects in sewage treatment was studied by estimating insect populations in the vertical and horizontal planes in 3 trickling filters with high, medium, and very low insect populations. Insects in the trickling filter bed are almost exclusively represented by the psychodid fly, Telmatoscopus albipunctatus (Williston). High populations of larvae were found at a depth of 12–24 inches. Larvae were more numerous closer to the center of the filter. Psychodid fly larvae are grazers of zoogleal film; their normal population of ca. 1/cm2 is useful, whereas higher populations create an adult fly nuisance. As long as interstices are unclogged, the filter works efficiently. Under low organic loading, the role of insects in sewage treatment appears to be insignificant.
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