Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 216 for “"Sewer"”.
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Simulating Land Developers', Sewer Providers', and Land Owners' Behavior to Assess Sewer Expansion *Policies
… develops a model of behavior of land owners, sewer providers, and land developers and the ways in which their plans and actions interact. The initial goal is to consider alternative behavioral explanations of these relationships and test which more accurately replicates the historical pattern …
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Monitoring of storm sewer overflows
… attributed to the frequent operation of combined sewer overflows (C. S. O. s). As the existing need for overflow structures is unlikely to change in the foreseeable future it is imperative that these deleterious effects are minimised. The present study investigates the pollution performance of …
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Unsteady Flow in Sewer Networks
Made available in DSpace on 2014-12-10T22:22:08Z (GMT). No. of bitstreams: 1 7412182.pdf: 4976989 bytes, checksum: 3c6c8b8b8f296a7ba579a5576941a99c (MD5) Previous issue date: 1973
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Acid resistance of sewer pipe concrete
The corrosion of sewer pipe concrete is a global problem, especially in warm climates in which biogenically generated sulphuric acid attacks the concrete and lowers its structural integrity. The Virginia Experimental Sewer is a ‘live sewer’ in South Africa for investigating acid resistance of …
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Acid resistance of sewer pipe concrete
… to sulphuric acid environments encountered in sewers. A hydrochloric acid solution (pH of 1,00) simulates the attack on concrete sewer pipes at the average daily sewage level region and in severely corrosive sulphuric acid environments (pH of less than 1,00) commonly encountered in South …
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Non-man-entry sewer renovation robot characteristics.
… engineering studies. In particular, sewer renovation methods, computer vision (CV) and robotics are all included. More specifically, the key objective of the research programme was to investigate the characteristics of retrofit components suited to mounting on an industrial / …
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Probability based scheduling to optimize sewer maintenance
… more on the issue of SSOs (Sanitary Sewer Overflows), sewer failures have been studied much in recent years. This thesis focuses on the blockages of sewer lines, which cause nearly half of the SSOs. A simulation model is developed to analysis efficiency of different inspection …
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Optimal sensor placement for sewer capacity risk management
… of untreated sewage that escapes combined sewer pipes each year (US EPA 2004a) and the estimated 40,000 sanitary sewer overflows and 400,000 backups of untreated sewage into basements (US EPA 2001). Failures in wastewater collection systems can be prevented if they can be detected in time …
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An Innovative Design for a Separate Sewer System
… ago is no longer valid today. Designers of new sewer systems must identify the problems inherited from old design concepts and try to use new technology to revisit and upgrade traditional urban drainage management. Separate sewer systems are currently used in all new developments. They are more …
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A computer vision approach for sewer overflow monitoring
Combined Sewer Systems (CSS) exist in over 700 communities across the United States. Under extreme wet conditions, excess inflow which is beyond the capacity of CSS results in Combined Sewer Overflows (CSOs); the consequence being direct discharge of untreated water into the environment. Current …
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Optimal Layout and Design of Storm Sewer Systems
Made available in DSpace on 2014-12-13T19:31:28Z (GMT). No. of bitstreams: 1 7616165.pdf: 7556635 bytes, checksum: fce932f5d05941e07711a4be2f95c469 (MD5) Previous issue date: 1976
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Kinetics of Hydrogen Sulfide Oxidation in Sanitary Sewer Systems
… the techniques commonly employed in sanitary sewer systems to determine the effectiveness of each process. To achieve this objective a laboratory simulation of these chemicals additions was carried out using completely mixed BOD bottles as batchreactors. The BOD reactor was filled with a 7 …
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Optimal management and operational control of urban sewer systems
Combined sewer networks control, like many other real world problems, is usually identified with competing and conflicting objectives. Decision makers have a great need of selecting the best possible control strategy in minimizing the combined sewer overflows (CSOs) when controlling the sewer …
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The performance of certain combined sewer overflows with storage
… for the reduction of pollution from combined sewer systems. Field data were gathered at three combined sewer overflow sites during dry weather and a wide range of high flow events. The overflows incorporated off-line storage which at two sites took the form of rectangular partitioned tanks and …
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Modeling of sulfide emission from the Virginia sewer system
Recognizing that attack in the sewer environment invovles five distinct processes occurring simultaneously, each with its own kinetics, any meaningful research can be effected only once the individual processes have been uncoupled and studied separately. The principal objective of this thesis is to …
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The movement of cohesive sediment in a large combined sewer
The presence of sediment deposits within sewerage systems may lead to operational (premature surcharging and surface flooding) and potential environmental problems (sediments act as a store of pollutants which can be released during erosion events). The consequences of allowing these problems to …
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Sewage disposal and sewer construction in the city of Milwaukee
Made available in DSpace on 2017-11-30T22:11:21Z (GMT). No. of bitstreams: 2 5997716.pdf: 21918617 bytes, checksum: 9ee0af90ce241b6f73260dde5d66d0c6 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1917
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GIS based optimal design of sewer networks and pump stations
In the planning and design of sewer networks, most of the decisions are spatially dependent because of the right of way considerations and the desire to have flow by gravity. This research addresses the application of combined optimization-geographic information system (GIS) technology in the …
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