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 12 of 12 for “"Chloramination"”.
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Impact of Chloramination on the Development of Oligotrophic Biofilms
… were operated. In the treatment reactor, chloramination at 8.5 ± 0.2 mg Cl2/L as combined chlorine was applied after two weeks of biofilm growth till the end of week 10. Confocal laser scanning microscopy combined with quantitative analysis using COMSTAT program revealed that disinfection …
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Ndma Formation During Chloramination: Temporospatial Distribution Of Ndma Precursors, The Effect Of Lime Softening Treatment, And Precursor Identification Via Non-Targeted Analysis
… a byproduct formed in drinking water during chloramination disinfection, is notorious both for its potent carcinogenicity and toxicity. NDMA and other nitrosamine precursors are compounds containing secondary, tertiary, and quaternary amines, which can be released from diverse sources into …
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X-ray Crystallographic Structure Determination of Aminotri-n-Propylarsonium Chloride and Mass Spectral Study of Amino-trialkylarsonium Chlorides.
… was originally prepared by Krannich (1) by the chloramination of tri-n-propylarsine. On the basis of infrared data, it was assumed that the compound was an aminoarsonium chloride salt. However, a pentavalent structure was also a possibility.
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Characterization of Unregulated Disinfection By-Products (DBPs) in Chloraminated Water and Estimation of Associated Health Risks
… reduce the formation of regulated DBPs. However, chloramination could produce more unregulated DBPs formation than chlorination according to some previous studies. To make it worse, many unregulated DBPs, which generally occur at very low concentration levels in drinking water, are proven to be …
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Multivariate Analysis of Disinfection By-products Formation in Drinking Water Distribution Systems
… were evaluated from the results. Furthermore, re-chloramination was found to be effective for reducing one class of chloramination DBP (N-nitrosamine) formation in a lab-scale DWDS under various conditions. Findings drawn from this research will provide guidance for water utilities to design …
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Advancing Monitoring and Mitigation of Antibiotic Resistance in Wastewater Treatment Plants and Water Reuse Systems
… applied disinfection processes (chlorination, chloramination, and ultraviolet irradiation [UV]) on the inactivation of antibiotic resistant pathogens and corresponding susceptible pathogens in recycled and potable water. Further, we evaluated their regrowth following disinfection by simulating …
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Formation of (halo)acetamides and (halo)acetonitriles from the reaction of monochloramine and (halo)acetaldehydes in water
Chloramination is increasingly being used in the United States as a secondary disinfectant as a result of tighter regulations on selected disinfection by-products (DBPs) that include four trihalomethanes and five haloacetic acids. However, recent research suggests that unregulated …
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Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… to investigate TTHM formation kinetics under chloramination to predict TTHM concentration in the Columbia drinking water distribution system when using monochloramine as a residual through a series of Simulated Distribution System (SDS) tests. Magnetic Ion Exchange Resin, namely …
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Study on the formation of nitrogenous disinfection by products from the reaction between dichloroacetaldehyde and monochloramine
… free chlorine pretreatment followed by chloramination was shown to enhance the formation of 15N-DBPs. A kinetic model was developed that predicted up to 90% of N-DBPs in natural waters.
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Biostability In Drinking Water Distribution Systems Study At Pilot-scale
… systems. Chlorination was more effective than chloramination in reducing HPC levels (1-2 log difference). There was a rapid increase in HPC corresponding to the change in steady-state water quality, which was observed in all PDS. Modeling effort demonstrated that HPC levels reached a maximum …
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Non-Uniform Copper Corrosion in Potable Water: Theory and Practice
… the effects of orthophosphate, chlorination, chloramination and enhanced coagulation on copper pitting propensity. Tracking of Ecorr suggested that the control water (without phosphate) had the greatest pitting propensity. The free chlorine system with orthophosphate maintained Ecorr values …
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Evaluating the effects of hydrogeologic processes on the fate of salinity and halogens in headwater catchments
… halogens and organic matter are disinfected via chloramination during wastewater treatment processes. Despite the emergence of I-DBPs as highly toxic, teratogenic, and potentially carcinogenic agents, controls on the transport of iodine in terrestrial aquatic environments have yet to be fully …