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 56 for “"Raw water"”.
-
Coagulation and flocculation process using cassava peel starch modified with lemongrass extract for pollutants removal in raw water
Sustainable and greener solution for water treatment problems is the persistent need in the current days. The present research synthesized a novel dual function coagulant using cassava peel starch with incorporation of lemongrass extract and evaluated the synergistic effect between alum and …
-
Removal of dissolved organic carbon and organic halide precursors by enhanced coagulation
Raw water samples from nine utilities were received, and water-quality analyses, bench-scale water treatment, and chlorination were performed to determine the effectiveness of enhanced coagulation at removal of dissolved organic carbon (DOC) and organic halide precursors. Bench-scale treatment …
-
Granular activated carbon pretreatment for the removal of trihalomethane precursors
… trihalomethane (THM) precursors from a surface water supply, the Occoquan Reservoir, in northern Virginia. The carbon contactors were operated in the upflow mode at flow rates of 2, 4, and 6 gpm which provided empty bed contact times (EBCT) of 26, 13, and 6.6 minutes, respectively. Reservoir raw …
-
A laboratory study of factors affecting the applicability of direct filtration water treatment
… in this thesis were to determine the limiting raw water turbidity that could be treated using selected direct filtration treatment schemes and to compare the results of direct filtration and conventional water treatment. A dual media, granular filter employing coal and sand was used to treat …
-
Cryptosporidium sp. and Giardia sp. in the St. Lawrence River: Impact on drinking water quality.
… parasites Cryptosporidium sp. and Giardia sp. in raw and treated water supplies on the St. Lawrence River; (b) to find a suitable microbial indicator for the presence of Cryptosporidium sp. and Giardia sp. in raw water; (c) to measure the survival capability of Cryptosporidium parvum in both the …
-
Estimation of evaporation losses based on stable isotope composition of water in the Calueque-Oshakati canal, Namibia
… has been operational since the 1970s, carrying raw water from the Calueque Dam on the Kunene River in the Southern region of Angola to the Central Northern region of Namibia. This raw water is conveyed to the purification plants along the canal, where it is purified before distribution to towns …
-
Electrochemical Pretreatment for Microfiltration of Surface Water: Mechanisms of Fouling and Its Control
… was evaluated for fouling control during surface water microfiltration (MF) using bench-scale galvanostatic batch electrolysis experiments followed by constant pressure, dead-end MF. In all cases, electrochemical aluminum production quantitatively obeyed Faraday’s law with a 3-electron transfer at …
-
Evaluation of the KanchanTM Arsenic Filter under various water quality conditions of the Nawalparasi District, Nepal
… the low-cost removal of arsenic from drinking water in rural Nepal. In this system, arsenic is removed via absorption onto the surface of ferric hydroxide, or rust, through the integration of locally available iron nails into a BioSand Filter setup. Since 2002, the KAF filter has been …
-
The feasibility of augmenting the Stellenbosch potable water supply by establishing a direct potable reuse plant
… past decade which has placed severe strain on raw water resources for both agriculture and municipal use. The crisis was due to many factors including climate change, increasing urbanisation and ageing infrastructure to name a few. The water scarcity problems will persist in the future globally …
-
Effect of Coagulation Pretreatment on Membrane Filtration Performance
… goals with important implications for the water treatment industry. First, an understanding of the conditions under which coagulation can improve membrane performance has been developed. Improved understanding of this relationship allows microfiltration and ultrafiltration to be applied to …
-
Measuring and modeling geosmin removal from Horsetooth Reservoir water by powdered activated carbon for selected contact times
… and actinomycetes, has been an issue in drinking waters in Northern Colorado. Geosmin does not pose a health threat; however, it imparts an earthy taste and odor to the finished drinking water even at very low concentrations (4 -10 ng/L), resulting in consumer complaints and dissatisfaction. …
-
Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… the formation of these DBPs varies with the water quality and/or the treatment process. The compliance of TTHMs may become a major issue in most facilities which use ground water as their raw water and apply softening as the primary treatment goal. For this kind of facility, however, …
-
PARTICLE REMOVAL IN FLOC BLANKET CLARIFIERS VIA INTERNAL FLOW THROUGH POROUS FRACTAL AGGREGATES
… in global access to safe and reliable drinking water, especially in rural communities, calls for a reevaluation of the design bases of treatment technologies. Robust and cost-effective design requires optimization of the various unit processes in a water treatment train. The mechanism of primary …
-
Role of oxidants in the removal of iron and organics from Harwood's Mill Reservoir
… floe formation after chlorinating filter-applied water was investigated. Shortened filtration-cycle times resulted when the filter-applied water contained the floc. The effects of varying pH, temperature, alum dosage, and oxidant addition on organic and meta.ls removals were examined with jar …
-
Optimization of the coagulation process at the Carvins Cove Water Treatment Plant
The overall process of water treatment is a compilation of various unit processes including: aeration, disinfection, the mixing of chemicals, flocculation, sedimentation, and filtration. The arrangement of these various unit processes into different treatment configurations provided the basis for …
-
A comparative study of the origins of cyanobacteria at Musina Water Treatment Plant using DNA fingerprints
… (HABs) and cyanobacteria toxins in drinking water sources are known to pose a great threat to humans. The main aim of this study was to use molecular technique to determine the origins of the cyanobacteria species at Musina raw water abstraction point by identifying and comparing the …
-
The Effect of Predisinfection with Chlorine Dioxide on the Formation of Haloacetic Acids and Trihalomethanes in a Drinking Water Supply
… the Blacksburg, Christiansburg, VPI (BCVPI) Water Authority in Radford, Virginia elected to eliminate prechlorination and replace it with preoxidation using chlorine dioxide (ClO2). Prior to full-scale application at the BCVPI Water Treatment Plant, jar testing was done to determine the …
-
The effects of rainfall runoff from urban and rural watersheds on trihalomethane precursors in streams
… was to investigate the relationship between watershed land use and seasonal changes on THM-formation potential from the waters of four streams located in northern Virginia. Specific objectives were to observe the effect of impoundment on downstream THM precursor concentrations and to evaluate …
-
Development Of A Spreadsheet For Bar Graph Softening
… used for decades for hardness removal in water treatment. Many methods are used for controlling lime feed to a water treatment system. Concentrations in influent to or effluent from a water softener are most often determined manually by physical measurements, though they can also be …
-
Development Of A Performance Analysis Framework For Water Pipeline Infrastructure Using Systems Understanding
The fundamental purpose of drinking water distribution systems is to provide safe drinking water at sufficient volumes and optimal pressure with the lowest lifecycle costs from the source (treatment plants, raw water source) to the customers (residences, industries). Most of the distribution …
Page 1 of 3