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 14 of 14 for “"trihalomethane formation"”.
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Trihalomethane formation potential of algal extracellular products and biomass
A study was conducted to determine the importance of algae as sources of orgnanic precursors in the haloform reaction. Two species each of green and blue-green algae were grown in laboratory conditions and harvested periodically during their growth cycle. The principal part of the study was …
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Trihalomethane formation in rural household water filtration systems in Haiti
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Impact of bromide ion concentration, time, dissolved organic carbon and molecular weight cutoff on haloacetonitrile, haloketone, chloropicrin and trihalomethane formation potentials
This research investigated the formation potential (FP) for haloacetonitriles (HANSs), haloketones (HKs), chloropicrin (CP) and trihalomethanes (THMs) under conditions of constant DOC, constant Cl:DOC ratio, variable [Br] and variable apparent molecular weight (AMW) for coagulated water from a …
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Evaluation of the use of ferrous iron for chlorite removal under alkaline pH conditions
… water treatment plants due to concerns regarding trihalomethane formation in drinking waters which utilize chlorine as the primary disinfectant and the strict regulations regarding THM's and THMFP (MCL of 0.080 mg/L for TTHMs) (Pontius, 1993). Although the use of Cl02 as a disinfectant prevents …
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Granular activated carbon pretreatment for the removal of trihalomethane precursors
… pretreatment 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, …
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Influence of Operational Characterization Methods on DOM Physicochemical Properties and Reactivity with Aqueous Chlorine
… Cl2 demand (mmol DCl2/ mmol DOM) and specific trihalomethane formation (mmol THM/mmol DOM) following chemical fractionation were attributed to increased molar DOM concentration and decreased DOM association with colloidal iron oxide surfaces. Collectively, the results of this research indicate …
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Development and application of fractionation procedure for drinking water organic matters
… of collected organic fractions, fractions' formation potential tests, and jar or similar tests to remove NOM. This study discussed a current resin fractionation procedure on principle, procedure, and its efficiency when applied to water samples of low NOM (< 5mgIL). The primary objective of …
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Effects of Microbial Community Stress Response and Emerging Contaminants on Wastewater Treatment Plants
… more than morphology. Disinfection by-product formation in the presence of nanoparticles during WWTP disinfection was assessed using silver, titanium dioxide, ceria, and zero valent iron nanoparticles. Silver nanoparticles were found to enhance trihalomethane formation, which was attributed to …
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Determination of the Influence of Polyurethane Lining on Potable Water Quality
… water was changed. Total solids (TS), odor, trihalomethanes (THMs), haloacetic acids (HAAs), and semivolatile organic carbons (SVOCs) were tested on days 1, 4, 9, and 14. The polyurethane lining had major impacts on pH, odor and haloacetic acids throughout the 30 day experiment. A 2-3 pH unit …
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Fluorescence Based Approach to Drinking Water Treatment Plant Natural Organic Matter (NOM) Characterization, Treatment, and Management
… as the coagulation-flocculation process and the formation of disinfection by-products (DBP) derived from the NOM-oxidant reaction in the disinfection step. In this study, samples of raw and treated water after coagulation were collected from drinking treatment systems serving the cities of Akron, …
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Využití potenciálu tvorby trihalomethanů k hodnocení účinnosti úpravy povrchové vody
Cílem bakalářské práce bylo zpracovat literární rešerši 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 …
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Trihalomethane Removal and Re-Formation in Spray Aeration Processes Treating Disinfected Groundwater
… the use of chlorine creates the unintentional formation of regulated chemicals. On January 4, 2006, the United States Environmental Protection Agency (EPA) promulgated the Stage 2 Disinfectants/Disinfection by-product rule (DBPR) that focuses on public health protection by limiting exposure to …