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 28 for “"thms"”.
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La clozapine et les neurostéroïdes dans la modulation de comportements associés au suicide dans un modèle murin de schizophrénie
… behavior in a schizophrenia-like context (THMS) (gestational inflammation followed by adolescent social isolation). In this model, clozapine normalized prepulse inhibition, aggressiveness, impulsivity and anxietylike behaviours in THMS mice. While the basis of clozapine superior …
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Drinking water disinfection by-products detection, formation and the precursors removal study
"Haloacetic acids (HAAs) and trihalomethanes (THMs) are two groups of commonly found disinfection by-products (DBPs). Iodinated THMs and HAAs were observed after disinfection of water containing high level of iodide and are proved to be more toxic than their corresponding chlorinated and brominated …
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Management of disinfection byproduct production in small drinking water systems
… regulated in drinking water are trihalomethanes (THMs) and haloacetic acids (HAAs). The objective of this research was to better understand how the water treatment processes employed at four smaller municipal water treatment utilities affects THM and HAA formation by measuring the removal of …
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Characterization of natural organic matter and precursors to trihalomethanes using spectral flourescence signatures
… DBPs are dominantly Trihalomethanes (THMs). However, not all organic compounds are equally reactive to THMs formation. NOM in water samples collected from the Delaware & Raritan Canal and its tributaries (Central New Jersey) was isolated by resin adsorption into six fractions: …
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A Non-Biological Inhibition Based Sensing Technique (NIBS) for the Detection of Halogenated Disinfection By-Products in Water
… with a specific focus on trihalomethanes (THMs). To achieve effective detection of halogenated organics, the effects of reaction temperature and reactant concentrations on the NIBS reaction were studied and optimized. In the present NIBS method, a pyridine-catalyzed reaction is inhibited …
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Disinfection by-products and prenatal development
… overall levels of brominated trihalomethanes (THMs), high overall levels of chlorinated THMs and low levels of THM species. We classified spatial variation of THMs within these distribution systems using methods based upon: overall levels of chlorinated THMs and low levels of total THM species. …
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Algal and bacterial interactions in producing precursors of trihalomethanes and other halogenated organics
… of chlorinated culture filtrate to form THMs. No significant changes in TOX-formation potential were observed. Heterotrophs grown in volumes of algal ECP (cell-free filtrates of algal cultures) used the algal-produced organic carbon as their sole carbon source. These microorganisms …
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The Occurrence and Control of Disinfection By-Products (DBPs) in Two Water Treatment Plants Utilizing the Same Source
… the early studies by Rook on trihalomethanes (THMs) (Stevens, 1977). Work conducted in the 1980s identified the existence of nonvolatile halogenated organics (non-THM organics), of which the majority produced by chlorination were haloacetic acids (HAAs), within the HAAs, dichloroacetic acid …
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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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Occurrence, monitoring and removal of drinking water contaminants by advanced technologies
… carcinogenic in comparison to regulated DBPs (THMs and HAAs, generated by FC disinfection). Also in the forefront of drinking water concerns are other emerging drinking water contaminants such as perchlorate. Perchlorate is a contaminant which can enter drinking water from natural deposits or …
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Removal of disinfection by-product precursors by activated carbon and MIEX(R)
… with HPI being poorly correlated (R2=0.20). THMs resulting from reactions with HPI NOM accounted for between 40% and 55% of THMs from all fractions.
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Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… issue for the public health. Trihalomethanes (THMs) and haloacetic acids (HAAs) are two of the major classes in DBPs. In response to this potential health risk from DBPs, the EPA established a current maximum contaminant level (MCL) is 80 [mu]g/L of THMs and 60 [mu]g/L of HAA[superscript 5] …
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Desarrollo de metodologías analíticas para la determinación de contaminantes orgánicos halogenados en muestras de interés medioambiental mediante Espectrometría de Masas (MS)
… para la determinación de trihalometanos (THMs) en aguas de consumo humano. Los THMs son un tipo de compuestos orgánicos volátiles halogenados (HVOCs) que se generan como subproductos de desinfección durante el proceso de cloración del agua y que según muchos estudios toxicológicos resultan …
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Study on the formation of nitrogenous disinfection by products from the reaction between dichloroacetaldehyde and monochloramine
… of chlorinated DBPs such as trihalomethanes (THMs) and haloacetic acids (HAAs), regulations that stipulate their maximum contaminant levels have been established since 1970s and gradually become more stringent. For this reason, switching to alternative disinfectants (i.e. ozone, UV or …
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Predictive model and near infrared spectroscopy in predicting the diesel fuel properties
… ANN that trained with same learning algori thms. Results were evaluated and discussed with previous studies that used the same data sets to establish the relationship between the NIR spectral data and diesel fuel properties. Finding depicts that the proposed SLM and SSCG were capable of …
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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
… (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 full-scale water treatment plant. Coagulated, high humic water (4.5 mg DOC/L) was fractionated into …
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Evaluation of treatment alternatives for THM-precursor removal from the Po River and Ni River, Virginia
… existing and future drinking water standards for THMs would be difficult, if not impossible.
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Oxidation of Disinfection Byproducts and Algae-related Odorants by UV/H₂O₂
… most prevalent classes of DBPs, trihalomethanes (THMs) and haloacetic acids (HAAs) were oxidized by UV photolysis alone and the UV/H₂O₂ process with 6 mg/L H₂O₂ and realistic ng/l to μg/L concentrations of the test compounds. The di-, and tri-brominated THMs and HAAs were substantially (80-99%) …
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Evaluation of Soil Aquifer Treatment in a Lab Scale Soil Column Experiment
… time was acknowledged. Nitrate, bromate, THMs and HAAs were completely reduced in 30-day columns. Total organic carbon was removed at 25 – 35% in all four columns. Seven out of the 106 contaminants of emerging concern (CEC) tested were consistently detected in the column feed and effluent …
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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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