Effect of Supernatant Water Depth on Algal Mat Development in Slow Sand Filter.
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Abstract
The differences of algal mat development on the slow sand filter beds in shallow ponds (110 cm depth) and in deep ponds (171 cm depth) were studied at Wakata water works, Takasaki city. The algal mat development in shallow ponds was high growth rate and marked a high standing mass. This was remarkable in summer. Decrease of algal biomass was observed after the peak biomass on 10 days in shallow ponds. It was estimated that this decrease was caused by the grazing of Chironomidae larvae. Colony size of the length of filamentous diatom of Melosira was measured to evaluate the health condition of diatom. Empty shells and small numbers of cology were abundant in deep filter beds. And chlorophyll a content to total pigments of algal mat in shallow ponds was higher than that in deep ponds. It seems that active growth of filamentous diatom in a shallow filter pond keeps an aerobic condition in the filter bed.
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