Thesis (Ph. D.)--Oregon State University, 1968. / Typescript (photocopy). Includes bibliographical references (leaves 84-88). Also available on the World Wide Web.

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"Sewer System Evaluation Surveys Conducted in Industrial Sewers," describes the methods employed and the results of Sewer System Evaluation Survey studies conducted at two industrial complexes. The procedural techniques for locating and quantifying infiltration and inflow into sewer systems represented to provide a basic understanding of the steps required to complete such studies. Case studies of actual surveys conducted at two privately operated industrial plants in Tennessee are presented to illustrate the utilization of the investigative techniques. The results of the studies are compared with each other and with similar studies conducted in municipal sewer systems.

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Inlet baffles in a sedimentation basin should distribute the incoming flow uniformly over the inlet zone. This allows the flow to pass through the tank in a plug flow fashion, giving the solids a more quiescent condition to separate from the liquid. It was the object of the investigation to determine which of the baffles studied performed this function most efficiently. Conventional, statistical, and dynamic analysis techniques were employed to evaluate baffle performance from input-output relationships of salt concentration. The statistical approach appeared to give much more meaningful information than did the "qualitative" or "conventional" parameters. The pulse testing techniques appeared to give more detailed information regarding the hydraulic characteristics of the model system tested. The model study results indicated that a 6-inch horizontal rectangular inlet baffle, positioned 8 inches from the inlet pipe, gave better performances than the other baffles tested. / M.S.

When domestic sewage is disinfected it is necessary to destroy the pathogenic organisms before discharge to the environment of mankind. Some of the more resistant pathogens may survive the disinfection process and escape to the environment. To minimize this possibility it is advisable to study the unit process know as disinfection and to determine if the disinfectant is adequately mixed to minimize the number of pathogens surviving. Eliassen et al (2) studied disinfection of sewage subjected to initial mixing. He reported the disinfection in systems subjected to slow initial mixing and systems subjected to rapid initial mixing were approximately equal. The method devised to study the mixing was the determination of the disinfection rate in continuously mixed systems disinfected with iodine. The mixing intensity was evaluated and the rate of disinfection determined by plotting the percent of microorganisms remaining against time ^m on semi-logarithmic paper (3). The slope of the data plotted was approximately -2.0 when the percent remaining was plotted against time ^1/3 for all experiments where the mean temporal velocity gradient (1) was greater than 11 per second and the power to volume ratio (4) was greater than 0.29 foot pounds per second per 1000 gallons. From these results and interpretation of Eliassen's studies (2), the initial mixing time required was estimated as one minute and the approximate quantity of mixing required was estimated as 1.3 tank turnovers corresponding to a product of mean temporal velocity gradient and time of 660 and a power to volume ratio for one minute of 21.6 foot pounds per 1000 gallons. The design and operation of plant scale disinfection processes could be evaluated considering the minimum mixing defined by this thesis, such evaluation might indicate the need for additional mixing other than the turbulence induced by the baffling presently used in the disinfection processes. / Master of Science

This investigation was primarily a study of the performance of the new sewage treatment plant serving Blacksburg, Virginia and V. P. I. during the initial period of operation, 1948-1949. This plant, designed for a sewage flow of one million gallons per day, provides primary and secondary treatment. Standard analyses were performed on samples at various stages in the treatment process to determine the efficiency of purification afforded by each unit. These tests indicate satisfactory operation of the plant in the reduction of pollution constituents of the influent sewage. Effects of treated sewage discharged to the receiving stream, Strouble’s Creek, were found to be negligible. Performance of Blacksburg - V. P. I. plant generally equaled that of several other sewage treatment facilities serving populations less than 60,000. Supplementary studies in this investigation included: the effects storm water diversion into the sanitary sewage system; and the appraisal and correction of operating problems encountered in this initial period of plant operation. / Master of Science

Master of Science

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management