Abstract
Treatment of municipal wastewater in High Rate ponds has been extensively studied in a multitude of outdoor pond units. The ponds are 35 to 50 cm deep with folding channels and are mixed and aerated by a rotor cage aerator. The suspended biomass is separated by flocculation and flotation yielding high quality effluent and algal “froth― containing between 5 to 10 percent solids to be further dewatered and drum dried. Average production of photoautotrophic algae reached 22gr m−2day−1 which constitute about 5.8 percent conversion efficiency of the photosynthetically available light. The photosynthetic oxygen supply reached over 35 gr m−2day−1 which constitute over two thirds of the oxygen demand for the aerobic degradation of the waste matter. Predominant algal species such as Scenedesmus dimorphus, Micractinium quadrisetum, Phytoconis sp. and Oocystis solitaria varied seasonally in the pond without any significant change in growth and productivity.
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