Browsing by Author "Mueller, James A."
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Item Combined Sewer Runoff And Overflow Characteristics From Treatment Plant Data(1981-04) Mueller, James A.; Di Toro, Dominic M.This research was undertaken to evaluate the adequacy of using a mass balance technique with daily treatment plant data to,determine combined sewer runoff and overflow characteristics. An hourly simulator was utilized to generate known runoff and overflow concentrations as well as plant concentrations, similar to raw treatment plant data. The daily balance technique was used to analyze the simulated treatment plant data which provided comparisons of the calculated to the known runoff and overflow concentrations. The bias and variability associated with the mass balance technique together with a theoretical analysis of the plant measurement error effects is presented. The unit loads and average concentrations from the NYC 26th Ward Treatment Plant area as well as the effect of rainfall characteristics on combined sewer runoff concentrations are also presented. This report was submitted in fulfillment of Grant No, R 806519-01 by Manhattan College under the sponsorship of the U. S. Environmental Protection Agency and covers the project period June 1, 1979 to February 28, 1981. This draft report has been submitted to EPA for publication.Item Experiments on the Benthal Oxygen Demands and Leaching Rates of Raw, Digested and Wet Oxidized Sludges(1971-03) Mueller, James A.; Jin-Lung Su, Walter; D'Arco, VincentRaw and digested sludge from the New York Metropolitan area is presently barged out to sea for ultimate disposal. This report presents the results of laboratory studies to determine the effects of various types of sludge treatment - digestion, wet oxidation and heat treatment - on the benthal oxygen demands and leaching rates of sludge deposits. Two types of laboratory studies were conducted: ( 1 ) Warburg studies to determine the oxygen demand of the sludges when in an aerobic condition and (2) continuous flow reactor studies with the sludge layered on the bottom of reactors to simulate actual sludge deposits. The results of the studies indicated that treatment of the sludge prior to disposal at sea would significantly reduce the benthal oxygen demands and leaching rates of the bottom deposits. An oxygen diffusion analysis indicated that anaerobic decomposition in the raw, digested, heat-treated and low wet oxidized sludge layers markedly increased the benthal oxygen demands. In contrast the bottom layers of the intermediate and h i g h wet oxidized sludges were relatively dormant with negligible anaerobic decomposition occurring.