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 52 for “"THM"”.
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Evaluation of treatment alternatives for THM-precursor removal from the Po River and Ni River, Virginia
… pretreatment for the removal of trihalomethane (THM) precursors from the Po River, the Ni River and the Ni River Reservoir waters in eastern Virginia. The effects of temperature and storage were also studied. Samples were collected on two occasions and were analyzed for total organic carbon …
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Characterization of a black coating overlying rock paintings found in Little Lost River Cave, Idaho using THM-GC-MS
… and to verify that the coating is anthropogenic, THM-GC-MS was performed on various samples collected throughout the cave, including soil samples from inside, outside, and above the cave. Humic and fulvic acids, synthetic and natural melanin, and experimentally created cooking residues were also …
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The effects of rainfall runoff from urban and rural watersheds on trihalomethane precursors in streams
… 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 the molecular-size distributions of …
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Využití potenciálu tvorby trihalomethanů k hodnocení účinnosti úpravy povrchové vody
… k využití potenciálu tvorby trihalomethanů (THM FP) jako ukazatele jakosti vody při úpravě povrchové vody. Bylo sledováno použití testu THM FP k hodnocení účinnosti běžných technologických metod úpravy přírodních vod se zvláštním zřetelem na vody se zvýšeným obsahem huminových látek. …
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The management of Trihalomethanes in water supply systems preferred access arrangement
… of potentially harmful trihalomethanes (THM) when using chlorine as a disinfectant in potable water supplies has led to tighter regulatory controls and hence a need for better models for THM management. The prediction of THM concentration is difficult due to the complex and changing …
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The removal of specific molecular weight fractions of trihalomethane precursors by alum coagulation
… in regards to the removal of trihalomethane (THM) precursors from a surface water supply, Peak Creek, in southwestern Virginia. Water was coagulated with various doses of alum with the pH uncontrolled and with the pH controlled at 5.2 - 5.3. Raw water and treated waters selected for efficient …
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The effects of seasonal change, impoundment, and stratification on trihalomethane precursors
… of Lake Manassas on trihalomethane (THM)-precursors in Broad Run, upstream and downstream of the reservoir, and in Lake Manassas. An additional objective was to determine the molecular-size distributions of the dissolved organic carbon, and the THM precursors of the organic carbon …
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Granular activated carbon pretreatment for the removal of trihalomethane precursors
… was evaluated for the removal of 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 …
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The influence of algal growth and related ecological factors in reservoirs on the production and control of trihalomethane precursors
… followed by clarification, for removing THM precursors from lake water. The weekly grab samples provided evidence of a general relationship between algal population densities and the THMFP of the lake water. Successional shifts in the dominant genera and species of algae had little …
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Trihalomethane compounds in the drinking water of Kuwait: A survey from source to consumer
… survey of the presence of trihalomethane (THM) compounds, as chlorination by-products, in drinking water in Kuwait have been performed. The survey covers the whole drinking water treatment cycle, starting with sea water and ending with the consumer tap. The data generated by the survey was …
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Algal and bacterial interactions in producing precursors of trihalomethanes and other halogenated organics
… exert an effect on the trihalomethane (THM) or total organic halogen (TOX) formation potentials of algal extracellular products (ECP), and (2) whether or not diurnal cycling of THM and TOX precursors occurs in vitro. These objectives were addressed through culture studies of …
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Chlorination disinfection by-products in drinking water and risk of pancreatic cancer.
… estimate of known exposure to trihalomethane (THM), bromodichloromethane (BDCM), and chloroform (TCM), while the second provided residence-specific estimates of THM exposure. Adjusted risk estimates were based on the most recent 30 years of exposure with missing data imputed using Observed …
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Trihalomethane-precursor production by Hydrilla verticillata in the Occoquan Reservoir
… reviewed the ability of hydrilla to release THM-precursors should this plant become established in the Occoquan Reservoir. It was found that the Occoquan Reservoir could support hydrilla. Three sources of THM-precursors were found to result from hydrilla. These included: 1) extracellular …
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Long-term ground response For borehole heat exchangers in clay
… studying the coupled thermo-hydro-mechanical (THM) response of clay to long-term seasonal heating and cooling induced by vertical heat exchanger arrays in clay. The research investigates and implements a new class of constitutive models based on the work by Zhang and Cheng (2013). The proposed …
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Total N-nitrosamine Precursor Adsorption with Carbon Nanotubes: Elucidating Controlling Physiochemical Properties and Developing a Size-Resolved Precursor Surrogate
… byproducts (DBPs) – such as trihalomethanes (THMs), dihaloacetonitriles (DHANs), and N-nitrosamines – during water treatment may also increase. N-nitrosamines may comprise the bulk of the chronic toxicity in treated drinking waters despite forming at low ng/L levels. This research seeks to …
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The Effect of Predisinfection with Chlorine Dioxide on the Formation of Haloacetic Acids and Trihalomethanes in a Drinking Water Supply
… haloacetic acids (HAAs) and trihalomethanes (THMs), 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 …
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The effect of altering autumn grazing management on sward structural characteristics, morphology and nutritive value
… mass and sward quality. Low target herbage mass (THM; 500 kg DM ha-1) should have a later DD, as swards continue to accumulate herbage, while maintaining sward quality, however, low THM, can potentially be carried over winter, average farm cover is below farm targets for spring demand (i.e. above …
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Assessing Biofiltration without Ozonation for Removal of Trihalomethane Precursors in Drinking Water at the Beaver Water District Drinking Water Treatment Plant
… include the four regulated trihalomethanes (THMs) and dichloroacetonitrile (DCAN). Rapid small-scale column tests (RSSCTs) and Pilot Plant filters operated at empty-bed contact times (EBCTs) of 4, 8, and 16 minutes were used to evaluate the performance of nutrient-amended (free ammonia and …
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Üçüncü nesil ve dördüncü nesil ışınım kaynakları için kullanılan magnetlerin ışınım karakteristiklerine etkilerinin incelenmesi
… incelenmiştir. Türk Hızlandırıcı Merkezi (THM) projesi kapsamında kurulması planlanan kızılötesi serbest elektron lazeri tesisinde (IR SEL) kullanılacak olan salındırıcı magnetler için gereken fiziksel parametreler tartışılmıştır. Salındırıcı magnet ile lazer demeti parametreleri …
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