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 17 of 17 for “"residual chlorine"”.
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Behavioral avoidance by fish of residual chlorine in power plant discharges
… shallow horizontal temperature gradient. At low chlorine doses fish significantly preferred the warmer water, whereas at high chlorine doses, the fish were repelled by the treated water. The TRC, CRC, and FRC avoidance thresholds varied between fish species, but the HOCl avoidance thresholds were …
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Effects of installing point-of-use filters intended for lead removal on drinking water quality
… from sinks with and without POU filters. Lead, residual chlorine, particles (0.1-50 µm), bacteria, temperature, pH, and total organic carbon were measured. Lead concentrations in all unfiltered samples were below 2.25 ppb, but post-stagnation, over half of filtered samples exceeded 5 ppb. The …
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Toxicological, physiological, and behavioral responses of the Asiatic clam, Corbicula sp., to biocidal and copper perturbations
… copper contamination. Regarding temperature and chlorine interactions, it was demonstrated that an increase of 10° C was needed to increase significantly adult and juvenile mortality in the presence of chlorine (0.30 mg/l TRC) during winter and summer. Naturally high temperatures also increased …
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ΥΓΕΙΟΝΟΜΙΚΗ ΚΑΙ ΜΙΚΡΟΒΙΟΛΟΓΙΚΗ ΕΡΕΥΝΑ ΤΩΝ ΣΥΣΤΗΜΑΤΩΝ ΥΔΡΕΥΣΗΣ ΣΤΗΝ ΕΛΛΑΔΑ
… BUT DISINFECTION WAS OF POOR QUALITY AND THE RESIDUAL CHLORINE CONCENTRATION TEST WAS PERFORMED DAILY IN 25,8% OF WATER UTILITIES. THE SOURCES OF WATER HAD ADEQUATE SANITARY PROTECTION IN 30,8% OF WATER SUPPLIES. FROM THE BACTERIOLOGICAL EXAMINATION, IT WAS CONCLUDED THAT 70% OF THE SAMPLES …
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Impact of Piping Materials on Water Quality in Tegucigalpa, Honduras
… of manganese in PVC and iron pipe surfaces, and residual chlorine and Pb concentrations in the distribution system was performed. The sampled neighborhoods received an intermittent service. Water was suspended for 8 hours every day due to water quantity problems in the city. Water and pipe …
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Disinfection of secondary treated sewage by chlorine in a continuous flow reactor
… of this study was to determine the amount of residual chlorine that was necessary to adequately disinfect secondary treated sewage in a continuous flow reactor. Trickling-filter, clarified effluent collected prior to chlorination at the plant site was filtered sterilized and inoculated with …
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Forecasting Chlorine Residual for Water Safety Using Artificial Neural Networks Ensembles in Humanitarian Water Systems
… of stored water. Ensuring sufficient chlorine residual is important for protecting drinking water against recontamination and ensuring water remains safe up to the point-of-consumption. This thesis investigated the use of ensembles of artificial neural networks (ANNs) to …
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An assessment of health hazards associated with the use of water mist systems as a cooling intervention in Australia
… temperature, water pH and concentration of free residual chlorine, total dissolved solids (TDS) and total organic carbon (TOC) were statistically analysed to determine their impact on the colonisation of OPPP in WMS. This research identified a critical knowledge gap regarding the health risk of …
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Evaluating localized electrochlorination systems as a low-cost means of producing potable water
… and household containers were tested for free residual chlorine (FRC) and microbiology (E. coli). A socio-economic study was conducted on the population collecting water from the DWS. For school settings, small-size electro-chlorinators and adapted teaching tools were tested in 20 schools from …
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Feasibility of Satellite Water Tanks for Urban Areas in Developing Countries
… in SWMM and the emitter function in EPANET. Free residual chlorine is used as a surrogate for water quality and chlorine boosters are added to improve water quality in the proposed distribution system. Simulation results indicate that strategic deployment and operation of satellite storage tanks …
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Pollutant monitoring with fibre optics in the deep ultraviolet
… 43 em, is demonstrated in the construction of a residual chlorine sensor. The second sensor cell, a capillary cell with an inner coating of Teflon AF, uses the low refractive index and the high transparency of Teflon AF in the ultraviolet to form a liquid-core waveguide (LeW). This sensor cell …
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Disinfectants and Plumbing Materials: Effects on the Sensory and Chemical Characteristics of Drinking Water
… of disinfectant and the presence of either chlorine or chloramines. A panel was trained in flavor profile analysis (FPA) according to Standard Methods 2170B and used to assess the sensory properties of all samples. Chemical analyses were performed to determine disinfectants, total organic …
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A multidisciplinary study of the Asiatic clam, Corbicula fluminea, from the New River, Virginia
… closure behavioral response by adults exposed to chlorine, cadmium, and zinc; the effects of these pollutants and temperature on the levels of metal binding protein in adults; and the efficacy of halogens ( chlorine and bromine) in providing acceptable levels of Asiatic clam biofouling control. …
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Reduction of odors associated with chlorine dioxide applications to drinking water
Chlorine dioxide has been used in drinking water treatment for the reduction of trihalomethanes and tastes-and-odors. Recently, chlorine dioxide was implicated as the source of offensive "cat-urine-like" and "kerosene-like" odors in drinking water. The purpose of this project was to determine the …
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Microbiological Quality of Ultrasonic Dental Scaler Output Water
… water samples were obtained, and neutralized for residual chlorine with sodium thiosulfate, from 12 ultrasonic scalers provided municipal tap water treated with an iodine resin cartridge (Group A), and from eight ultrasonic scalers provided distilled water treated with a 0.78% silver ion-based …
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Metallic cobalt derived from cobalt nitrides for Fischer-Tropsch Synthesis
… a report conducted by Rosynek & Polansky (1991), residual chlorine ions from the cobalt chloride salt (similar to the precursor salt used in this research) blocked a considerable amount of the reduced metallic catalyst during FT studies. The SEM-EDX conducted on the spent catalysts confirmed the …