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.
Results
Showing 1 to 20 of 50 for “"Water Research"”.
-
Aggressive water attack on carbonated cement materials
… changes in chemical characteristics of the water exposed to cement concrete samples, inter alia pH, calcium and alkalinity. Over the period of the investigation (100 days) the following observations were found to apply to both brown and white water: (i) Generally uncarbonated OPC experiences …
-
The effect of sludge age and aerobic sludge mass fraction on low F/M filament bulking in intermittent aeration nitrogen removal systems
Since 1989 a wide ranging program of research has been under way to identify the factors that effect low F/M filament proliferation. Completed work has established an important factor conducive to low F /M filament proliferation - the presence of anoxic and aerobic zones, or, alternating …
-
An experimental investigation of leakage flow paths in soil surrounding leaks in water distribution systems
Over the last few decades, water stress has been imminent in most municipalities around the world. The problem of water losses from pipelines is a major concern due to the increasing demands. Leakage is normally responsible for a large percentage of water losses in distribution systems and results …
-
The effect of temperature on denitrification kinetics and biological excess phosphorus removal in nutrient removal activated sludge systems in temperate climates (12°C - 20°C)
… capacity, between 50% and 7 5% more wastewater could be treated in existing nutrient removing activated sludge plants. Anoxic-aerobic (AA) or low F/M filaments appear to proliferate in activated sludge plants that incorporate biological nitrogen removal. From earlier research, Casey et al. …
-
The development of an ancillary textile industry waste treatment process
The objective of this thesis is twofold - (1) to design the unit processes for treating the waste from a specific industrial plant using the best practicable technology, and (2) to critically examine the theory of these unit processes for utilization in design. The industrial waste was derived from …
-
The removal of nitrogen and phosphorus in anoxic-aerobic digestion of waste activated sludge from biological nutrient removal systems
… and phosphorus are released, producing a dewatering liquor high in ammonia or nitrate and phosphate. Not only does this dewatering liquor need to be treated, but the phosphate also precipitates in the digester and surrounding pipework, resulting in loss of digester capacity and pipe …
-
The feasibility of implementing advanced metering technology in high income areas in South Africa
Water is an important natural resource and a building block to all life on earth. However, substantial increase in water demand and consumption has led to numerous nations, including South Africa, to face water scarcity. Improved water demand management strategies and water monitoring approaches …
-
Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation
… problems associated with lime treatment in waste water reclamation. The contribution to knowledge is briefly outlined below. One of the major problems associated with lime treatment is the instability of lime-treated effluent, which may result in serious calcium carbonate scale formation problems. …
-
Advanced water metering and its application in low income communities
… Africa, it is a legislative requirement that all water supply points be metered (van Zyl, 2011). Conventional meters are mostly used as the main means of monitoring water consumption by South African municipalities. In the last two decades, the water metering industry has seen substantial …
-
Selected technology options for sanitation provision to developing communities in urban South Africa
In 1990 the Water. Research Commission initiated an evaluation of sanitation entitled "Technical, socio-economic and environmental evaluation of sanitation systems for developing urban areas in South Africa". The research project was undertaken jointly by Palmer Development Group and the University …
-
Water supply in the Eastern Cape: an economic case study of land rehabilitation in the Kromme River Catchment
This thesis emerged from funded research by ASSET Research, contracted by Water Research Commission. The project is co-funded by the ‘Working for Water’ programme. It forms part of a series of interdisciplinary studies focusing on the restoration of natural capital at nine sites throughout South …
-
Grave expectations : participatory greywater management in two Western Cape shack settlements
… growth of underserviced shack settlements. Waste water disposal is but one of many aspects of basic services that are lacking. This anthropological dissertation is focused upon a Water Research Commission funded project, conducted by University of Cape Town academics from the departments of Civil …
-
Dual modality tomography for the monitoring of constituent volumes in multi-component flows.
… for this purpose evolved from a desire by the Water Research Council to determine volume flow rates of the major components of sewage. No single sensing method is capable of detecting all suspended solids in sewage flows therefore a decision was taken to combine the technologies of electrical …
-
A Multidisciplinary Approach for Determining the Extents of the Beds of Complex Natural Lakes in Louisiana
… of natural monuments known as ordinary high water marks. The term is confusing and subjective, leading to controversy in reference to its determination. Catahoula Lake in central Louisiana was chosen as a study site because of its large size, its 20-foot variation in water levels, and its …
-
The productive landscape : wetland rehabilitation at the lower reaches of the Liesbeek River
… site works, that embodies the process of natural water filtration, using water from the Liesbeek River. Natural ecosystems are restored through the cultivation of endangered wetland plants in controlled growing beds for wetland rehabilitation on the site. Filtered water from the constructed …
-
MONITORING INFILTRATION FROM NATURAL STORMS USING TIME-LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY
… perpendicular to a stream at the Stroud Water Research Center in Chester County, PA to provide continuous measurement of unsaturated flow during two natural infiltration events. Dielectric sensors were installed along this transect to collect soil moisture data during these events. …
-
Conversion of Saline Water to Fresh Water Using Air Gap Membrane Distillation (AGMD)
… (MD) is a combination of evaporation of water from saline solution and diffusion of vapour through a hydrophobic membrane. The driving force is the vapour pressure difference created by temperature difference across the membrane. With development of hydrophobic membranes at a cheaper …
-
Development of a Design Tool for Rapid Gravity Media Filtration in Water Treatment
Filtration is the most commonly used water treatment process (Gray, 2010) and can be found at every water treatment plant in South Africa (Van Duuren, F. A., South Africa Water Research Commission., 1997). Therefore, the design, evaluation and improvement of filtration systems is (and should be) …
-
Solid transport in combined sewerage systems
… sewer systems has given rise to a great deal of research both in the UK and internationally. A collaborative research effort has been initiated by the Water Research Centre (WRc) under the auspices of the UK Urban Pollution Management (UPM) programme to study all aspects of sediments in sewers. …
Page 1 of 3