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 58 for “"total coliform"”.
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Assessing the Contamination Risk of Private Well Water Supplies in Virginia
… considered unsafe for consumption. Nitrate and total coliform bacteria are both health contaminants and are both regulated in public water systems. A nitrate concentration of 10 mg/L or higher is considered unsafe, as is the presence of total coliform bacteria. Well degradation, inadequate well …
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Household scale slow sand filtration in the Dominican Republic
… based on flow rate, turbidity removal and total coliform removal in communities surrounding the cities of Mao, Puerto Plata and Dajabon. Filter owners were interviewed about general filter use, water storage methods, filter maintenance practices, and water use. Data analysis revealed that …
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Modification of a biosand filter in the northern region of Ghana
… BSFs require less frequent cleaning. The average total coliform removal after 11 days was 87 % with an average effluent concentration of 430 cfu/100 ml from an influent concentration of 15,000 cfu/100 ml. Concurrently, 30 BSFs (HydrAidTM BioSand Water Filter) that were installed in a local village …
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An analysis of spatial and temporal variation in fecal indicator concentrations in Singapore
… of four fecal indicators: E. coli, enterococci, total coliform, and human factor. Twenty twelve-hour time series were examined, with indicator concentrations measured every hour from 8 am to 7 pm. Six stations in Singapore were evaluated, across three land-use categories (high-density …
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A performance study of ceramic candle filters in Kenya including tests for coliphage removal
… evaluated based on turbidity removal, flow rate, total coliform and E. coli removal, and cost. The Pelikan filters were also subjected to tests for viral removal using MS2-coliphages. Results from studies indicated that the Pelikan filters were the most effective at removing turbidity from Charles …
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Impact of Animal Waste Best Management Practices on the Bacteriological Quality of Surface Water
… the watershed outlet, and analyzed for fecal coliform, total coliform, and fecal streptococcus bacteria. Other data compiled from the watershed included hydrologic, meteorologic, geologic and land use data, also collected on a regular basis. Data were collected continuously throughout the …
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Application of hazard analysis critical control point (HACCP) concept to study cattle slaughterhouse hygiene and Carcass contamination in Zambia
… from each environmental surface per visit. A total of 2176 swabs were collected from 72 carcasses, and 96 swabs from the above mentioned environmental surfaces from slaughterhouses A and B. Observational results for various hygiene categories where scored for slaughterhouse A, B, C and D. …
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Application of hazard analysis critical control point (HACCP) concept to study cattle slaughterhouse hygiene and Carcass contamination in Zambia
… from each environmental surface per visit. A total of 2176 swabs were collected from 72 carcasses, and 96 swabs from the above mentioned environmental surfaces from slaughterhouses A and B. Observational results for various hygiene categories where scored for slaughterhouse A, B, C and D. …
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Potential of selected microalgae in bioremediation of wastewater polluted dam water: A case of Goreangab dam in Windhoek, Namibia
… 12 and quantitatively assessed for faecal and total coliform bacteria, heavy metals (Pb and Cd) as well as nutrients (phosphorous and nitrates). A one-way analysis of variance (ANOVA) indicated that there were no statistical differences between the mean values of Pb (p = 0.346) and Cd (p = …
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Springing for Safe Water: Drinking Water Source Selection in Central Appalachian Communities
… from roadside springs has been found to contain total coliform and E. coli, suggesting that consumers may be at an increased risk of contracting gastrointestinal illnesses. This research effort seeks to better understand roadside spring usage in Central Appalachia, by exploring motivations …
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An evaluation of household drinking water treatment systems in Peru : the table filter and the safe water system
… Peru demonstrated 99.6% E.coli removal and 95% total coliform removal. Only 30% of the SWSs tested contained water at or above the WHO-recommended concentration of free chlorine residual (0.2 mg/L). The author recommends that use of these HWTSs continues and that the program receives increased …
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Evaluating Coliform Monitoring Strategies for Contamination Scenarios in a Distribution System Model
… and to test these samples for the presence of total coliforms to comply with the Total Coliform Rule. How and where they take these samples is not specified. The Total Coliform Rule is currently undergoing review and revision. One possible revision is more specific rule language or guidance of …
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Development of Water and Wastewater Biofiltration Technologies for the Developing World using Locally Available Packing Media: Case Studies in Vietnam and Haiti
… 3) determine the effect of number of charges, total organic carbon loading, and schmutzdecke composition on <italic>V. cholerae</italic> removal efficacy; 4) isolate the effect of biological removal mechanisms and physical/chemical removal mechanisms on <italic>V. cholerae</italic> removal …
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Analysis of the efficacy of a constructed wetland in treating human fecal contamination
… a subsurface wetland. Measured concentrations of total coliform ranged between 300 and 40,000 MPN/100 mL, E. coli between 1 and 1000 MPN/100 mL, enterococci between 1 and 750 MPN/100 mL, and the HF marker between 2.7 x 10³ and 4.6 x 10 CE/100 mL. The overall removals of total coliform, E. coli, …
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Investigation on different vertical aerated rock filter (vertical aerated rock filter) in removing phosphorus from domestic wastewater
… of phosphorus. Based on the optimization study, total phosphorus (TP) removal was perfectly removed by using an airflow rate of 7L/min and HLR of 1.04 m3/m3.day. The VASSF was efficiently removed by 89%, 75%, 73%, 30% and 96% of biochemical oxygen demand (BOD), chemical oxygen demand (COD), total …
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Evaluation of an Electro-Disinfection Technology as an Alternative to Chlorination of Municipal Wastewater Effluents
… efficiency of an electrochemical system for total coliform removal from wastewater effluents after secondary treatment. Four bench scale batch electrochemical cells were assembled and operated in the laboratory: the first electro-disinfection reactor was set with aluminum electrodes, the …
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Assessment of the Quality of Domestic water in Kinondoni District, Dar es salaam, Tanzania
… were: (i) to determine levels of fecal and total coliform bacteria in domestic water supplied from private wells (boreholes) and water trucks, and compare these with the Tanzania Drinking Water Standards of 2008; (ii) to assess the physical quality of domestic water using pH, turbidity, …
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Monitoring and evaluation of the ceramic hemispheric filter in Northern Ghanaian households
… The Correct Use survey was administered to a total of 85 beneficiary households in Yipelgu. Pertinent factors, such as filter assembly, treatment, safe storage, and maintenance, related to Correct Use were addressed in the survey. The variables included in the survey were hypothesized to …
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Associations between Fecal Indicator Bacteria Prevalence and Demographic Data in Private Water Supplies in Virginia
… concentrations of fecal indicator bacteria (e.g. coliforms, E. coli) in 831 samples collected at the point-of-use in homes with private water supply systems and homeowner-provided demographic data (e.g. homeowner age, household income, education, water quality perception). Household income and the …
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Evaluation of the safe water system in Jolivert Haiti by bacteriological testing and public health survey
… The use of the system reduces the number of total coliform colonies by a factor of ten and the number of E.coli colonies by a factor of twenty. Moreover, if the water presents chlorine residual (indicating safe use of the system), the presence of total coliform units is lowered by a factor …
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