scholarly journals The Characterization of Significant Direct Threats to Source Watersheds: a Risk-Based Approach

2021 ◽  
Author(s):  
Alicia Kelly
Keyword(s):  
Drinking Water ◽  
Water Resources ◽  
Giardia Lamblia ◽  
Water Source ◽  
Scientific Data ◽  
Drinking Water Source ◽  
Water Protection ◽  
Quantitative Characterization ◽  
Drinking Water Resources

In 2004, the Ontario Ministry of the Environment proposed the 'Drinking water source protection act' which stipulated that, in the development of water protection plans, significant direct threats to source watersheds are to be identified. Examination of the major risk factors threatening water resources proved there are insufficient scientific data available to regulators to accomplish this task. Research showed E.coli O157:H7, Salmonella, Giardia lamblia, and Cryptosporidium parvum, and the sources of these pathogens in the environment are, qualitatively, significant threats to water resources. However, a quantitative characterization of significance depends of the failure probabilities of pathogen sources. Using the Ontario Spills Action Centre data, the occurrence of failure was found to have a high non-zero probability. However, considerable uncertainties revealed in these data suggest that a better understanding of failure is critical to accurately characterize significant threats to drinking water resources.

scholarly journals The Characterization of Significant Direct Threats to Source Watersheds: a Risk-Based Approach

2021 ◽  
Author(s):  
Alicia Kelly
Keyword(s):  
Drinking Water ◽  
Water Resources ◽  
Giardia Lamblia ◽  
Water Source ◽  
Scientific Data ◽  
Drinking Water Source ◽  
Water Protection ◽  
Quantitative Characterization ◽  
Drinking Water Resources

In 2004, the Ontario Ministry of the Environment proposed the 'Drinking water source protection act' which stipulated that, in the development of water protection plans, significant direct threats to source watersheds are to be identified. Examination of the major risk factors threatening water resources proved there are insufficient scientific data available to regulators to accomplish this task. Research showed E.coli O157:H7, Salmonella, Giardia lamblia, and Cryptosporidium parvum, and the sources of these pathogens in the environment are, qualitatively, significant threats to water resources. However, a quantitative characterization of significance depends of the failure probabilities of pathogen sources. Using the Ontario Spills Action Centre data, the occurrence of failure was found to have a high non-zero probability. However, considerable uncertainties revealed in these data suggest that a better understanding of failure is critical to accurately characterize significant threats to drinking water resources.

Double-endpoint Genotoxicity Quantification and PAHs Characterization of Drinking Water Source alongside Polluted Yinghe River with High Tumor Mortality

2021 ◽  
Vol 41 (2) ◽  
pp. 189-198
Author(s):  
Wei Zhang ◽  
Chen Guo ◽  
Xiao-li Wang ◽  
Zhan-lu Lv ◽  
Lin Fan ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Drinking Water Source

Evaluation on Water Quality of Urban Drinking Water Source in Beibei District, Chongqing

2013 ◽  
Vol 409-410 ◽  
pp. 148-151
Author(s):  
Jie Xiang ◽  
Chang Ming Cheng ◽  
Yi Zhang
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Evaluation Method ◽  
Water Source ◽  
Drinking Water Source ◽  
Quality Of Water ◽  
Drinking Water Resources ◽  
Index Evaluation ◽  
Urban Drinking Water

In 21 century, water quality problem is one of the most serious questions that effected human healthy and social development. In this context, it is necessary to evaluation water quality for drinking water. This is undoubtedly of great significance to human health and social stability. Based on the water monitoring and field surveys, this manuscript applied with “one-vote negation” method and eutrophic index evaluation method for two important urban drinking water resources in Beibei district, Chongqing. These two method were mainly depend on single water quality index which was indicated the worst one. And the results shower that: (1) evaluation by “one-vote negation” method, water quality of water resource D was satisfied with grade Ⅲ, and centralized water supply of J was meet with grade Ⅱ. (2)Eutrophication assessment on all water points indicate that the evaluation results of water quality is acceptable.

scholarly journals White and Red Brazilian São Simão’s Kaolinite–TiO2 Nanocomposites as Catalysts for Toluene Photodegradation from Aqueous Solutions

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3943
Author(s):  
Lucas D. Mora ◽  
Larissa F. Bonfim ◽  
Lorrana V. Barbosa ◽  
Tiago H. da Silva ◽  
Eduardo J. Nassar ◽  
...  
Keyword(s):  
Drinking Water ◽  
Sol Gel ◽  
Structural Evolution ◽  
Water Source ◽  
Drinking Water Source ◽  
Thermal Treatments ◽  
Photochemical Degradation ◽  
Degradation Behavior ◽  
Volatile Organic

The presence of volatile organic compounds in groundwater is a major concern when it is used as a drinking water source because many of these compounds can adversely affect human health. This work reports on the preparation and characterization of white and red Brazilian São Simão’s kaolinite-TiO2 nanocomposites and their use as catalysts in the photochemical degradation of toluene, a significant volatile organic compound. The nanocomposites were prepared by a sol-gel procedure, using titanium bis(triethanolaminate)diisopropoxide as a precursor. Thermal treatments of the nanocomposites led to different polymorphic titania phases, while the clay changed from kaolinite to metakaolinite. This structural evolution strongly affected the photocatalytic degradation behavior—all the solids efficiently degraded toluene and the solid calcined at 400 °C, formed by kaolinite and anatase, showed the best behavior (90% degradation). On extending the photochemical treatment up to 48 h, high mineralization levels were reached. The advantage of photodegradation using the nanocomposites was confirmed by comparing the results from isolated components (titanium dioxide and kaolinite) to observe that the nanocomposites displayed fundamental importance to the photodegradation pathways of toluene.

Global return flow ratio

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Return Flow ◽  
Drinking Water Source ◽  
Chemical Contamination ◽  
Flow Ratio ◽  
Piped Water ◽  
Dug Wells

Population using an improved drinking water source (piped water into dwellings, yards or plots; public taps or standpipes; boreholes or tubewells; protected dug wells; or protected springs and rainwater) that is located on premises and available when needed and which is free of faecal and priority chemical contamination. Basin Pollution Quality Waste

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