Showing papers on "Hydraulic retention time published in 1977"

Factors affecting effluent quality from fill-and-draw activated sludge reactors

Abstract: Experiments were conducted in fill-and-draw reactors to determine the effects of influent substrate (lactose) concentration and hydraulic residence time upon the concentration of soluble organic matter in the effluent from plug flow activated sludge reactors. The effluent soluble chemical oxygen demand and influent substrate concentration were found to be linearly related although little of the residual organic matter was the original substrate. Furthermore, a simple mathematical model was able to predict the effects of the influent substrate concentration. It was not possible to conclude whether the hydraulic residence time had a significant effect upon effluent quality. The observed effect was so small, however, that it is likely to be of little practical significance.