scholarly journals Microbiologic effectiveness of hand washing with soap in an urban squatter settlement, Karachi, Pakistan

2001 ◽  
Vol 127 (2) ◽  
pp. 237-244 ◽  
Author(s):  
S. P. LUBY ◽  
M. AGBOATWALLA ◽  
A. RAZA ◽  
J. SOBEL ◽  
E. D. MINTZ ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Storage ◽  
Hand Washing ◽  
Wash Water ◽  
Coliform Bacteria ◽  
Contaminated Water ◽  
Final Model ◽  
Safe Water ◽  
Squatter Settlement ◽  
The Difference

We conducted a study in a squatter settlement in Karachi, Pakistan where residents report commonly washing their hands to determine if providing soap, encouraging hand washing, and improving wash-water quality would improve hand cleanliness. We allocated interventions to 75 mothers and collected hand-rinse samples on unannounced visits. In the final model compared with mothers who received no hand-washing intervention, mothers who received soap would be expected to have 65% fewer thermotolerant coliform bacteria on their hands (95% CI 40%, 79%) and mothers who received soap, a safe water storage vessel, hypochlorite for water treatment, and instructions to wash their hands with soap and chlorinated water would be expected to have 74% fewer (95% CI 57%, 84%). The difference between those who received soap alone, and those who received soap plus the safe water vessel was not significant (P = 0·26). Providing soap and promoting hand washing measurably improved mothers' hand cleanliness even when used with contaminated water.

scholarly journals Household stored water quality in an intermittent water supply network in Panama

2020 ◽  
Vol 10 (2) ◽  
pp. 298-308
Author(s):  
Carlos I. Gonzalez ◽  
John Erickson ◽  
Karina A. Chavarría ◽  
Kara L. Nelson ◽  
Amador Goodridge
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Supply ◽  
Water Storage ◽  
Total Coliform ◽  
Drinking Water Supply ◽  
Coliform Bacteria ◽  
Plate Count ◽  
Probable Number ◽  
Total Coliform Bacteria

Abstract Safe water storage is critical to preserve water quality, especially when intermittent piped drinking water supply creates a need for household storage. This study characterized household storage practices and stored water quality in 94 households (N = 94) among four peri-urban neighborhoods in Arraiján, Panama with varying degrees of supply intermittency. We found that 18 (19.1%) households stored drinking water in unsafe containers. Forty-four (47%) samples of household stored drinking water had residual chlorine levels <0.2 mg/L. While 33 (35.1%) samples were positive for total coliform bacteria, only 23 (24.4%) had >10 most probable number (MPN)/100 mL total coliform bacteria. Eight (44%) samples were positive for Escherichia coli, whereas only one (1.3%) sample from the safe containers was positive. Twenty-nine (30.9%) samples had >500 MPN/mL heterotrophic plate count bacteria. These findings suggest that longer supply interruptions were associated with longer storage times and lower chlorine residual, which were associated with higher concentrations of indicator bacteria. This is one of the first studies in the Central-American region to show an association between the lack of turnover (replacement with fresh water) and greater contamination during household water storage. Thus, when drinking water supply is not completely continuous and household storage is required, decreasing the time between supply periods can facilitate safer water storage. Public awareness and education are also recommended to increase hygiene practices during water collection and storage.

scholarly journals Water Quality in Pokhara: A Study with Microbiological Aspects

2020 ◽  
Vol 2 (1) ◽  
pp. 149-161
Author(s):  
Kishor Kumar Shrestha
Keyword(s):  
Water Quality ◽  
Water Samples ◽  
Advanced Technology ◽  
World Health ◽  
Coliform Bacteria ◽  
Academic Institutions ◽  
Laboratory Examination ◽  
Safe Water ◽  
Water Borne ◽  
Microbiological Aspects

 Obviously, water management is challenging issue in developing world. Dwellers of Pokhara use water from government supply along with deep borings and other sources as well. Nowadays, people are also showing tendency towards more use of processed water. In spite of its importance, quality analysis of water has been less emphasized by concerned sectors in our cities including Pokhara. The study aimed for qualitative analysis of water in the city with focus on microbiological aspects. For this purpose, results of laboratory examination of water samples from major sources of government supply, deep borings, hospitals, academic institutions as well as key water bodies situated in Pokhara were analyzed. Since water borne diseases are considered quite common in the area, presence of coliform bacteria was considered for the study to assess the question on availability of safe water. The result showed that all the samples during wet seasons of major water sources of water in Pokhara were contaminated by coliform bacteria. Likewise, in all 20 locations of Seti River, the coliform bacteria were recorded. Similar results with biological contamination in all samples were observed after laboratory examination of more than 60 locations of all three lakes: Phewa Lake, Begnas Lake and Rupa Lake in Pokhara. The presence of such bacteria in most of the water samples of main sources during wet seasons revealed the possibilities of spreading water related diseases. Again, microbiological contamination observed from significant number of bottled water samples as well as boring sources clearly alarmed the preoccupied belief in such supply of water. On the other hand, fluctuating water quality of academic institutions and hospitals questioned on the priority of the management and seriousness against possible spreading of water borne diseases. For obtaining the safe water, various treatment options have been recommended from World Health Organization (WHO) with chlorination in top priority due to affordability and simplicity. Urgent execution of such option could be important with due consideration of negative aspects from the possible byproducts. However, proper implementation of filtration technique and planning of further advanced technology could be valuable for fulfilling the need of metropolitan dwellers to get wholesome water for their daily consumption.

scholarly journals Determinants of drinking-water quality and sanitary risk levels of water storages in food establishments of Addis Ababa, Ethiopia

2021 ◽  
Author(s):  
Aderajew Mekonnen Girmay ◽  
Sirak Robele Gari ◽  
Gebreab Teklebirhan Gessew ◽  
Mulumebet Tadesse Reta
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Storage ◽  
Hand Washing ◽  
Drinking Water Quality ◽  
Regulatory Body ◽  
Water Type ◽  
Risk Levels ◽  
Determinant Factors ◽  
Food Outlets

Abstract The study aimed to assess the determinants of drinking-water quality and sanitary risk levels of water storage. An institution-based cross-sectional study was conducted. One hundred and twenty-five drinking-water samples were collected directly from food outlets' drinking-water storages. Observational checklist was used to assess sanitary risk levels of the storages. Data analysis was conducted using multivariable logistic regression. Type of primary source of drinking-water, having continuous piped water, type of drinking-water storage equipment, drinking-water storage having a lid/cover, method of drinking-water drawn from the water storages, presence of any method of drinking-water treatment, and having functional hand-washing facility with soap near the toilet were identified as major determinant factors. This study revealed that nearly 30% of the food outlets' drinking-water was not microbiologically safe. As a result, these establishments could be a source of different health problems for their customers. In the study, many determinant factors that affect drinking-water quality of the food outlets were identified. As well, 16.3% and 18.7% of the food outlet drinking-water storages were grouped into high and very high contamination risk levels, respectively. Therefore, the existing regulatory body should force the food outlets to have effective hand-washing practices, clean, suitable drinking-water storage, and to avoid dipping practice.

Design of a climate-dependent water reuse project

2002 ◽  
Vol 46 (6-7) ◽  
pp. 289-296 ◽  
Author(s):  
P. Xu ◽  
F. Brissaud ◽  
J.C. Maihol ◽  
F. Valette ◽  
V. Lazarova
Keyword(s):  
Water Quality ◽  
Irrigation Water ◽  
Water Reuse ◽  
Reclaimed Water ◽  
Water Storage ◽  
Cost Effective ◽  
Water Quantity ◽  
The Difference ◽  
Atlantic Island ◽  
Modelling Approach

Reclaimed water storage is imperative in water reuse management. Climate is a primary factor controlling reclaimed water storage design by its significant influence on irrigation water needs as well as on stored water quality. This study presents a modelling approach that has been applied to assist the design of a climate-dependent water reuse project on an Atlantic island. Models for predicting irrigation water needs and water quality in tertiary lagoons were coupled with a technical-economic model to design reclaimed water storage facilities. Three scenarios corresponding to different augmentation of current reclaimed water reuse were investigated. According to the modelling, the storage sizes to meet the water quantity required for irrigation increased with water deficit - the difference between evapotranspiration and precipitation. The size of tertiary lagoons to meet required water quality was found to be larger than the size to meet required water quantity. To meet both quantitative irrigation needs and <1,000 FC/100 ml irrigation and disposal regulation, extending the tertiary lagoon system would be more cost-effective than storage calculated to meet only quantitative irrigation needs supplemented with UV disinfection. The reliability of reclaimed water storage design was estimated with 40 years historic climatic records.

scholarly journals Adapting a safe water storage container to improve household stored water quality in rural Burkina Faso: a cluster randomized trial

2021 ◽  
Author(s):  
Darcy M. Anderson ◽  
Michael B. Fisher ◽  
Osborn Kwena ◽  
Hermann Kambou ◽  
Romain Broseus ◽  
...  
Keyword(s):  
Water Quality ◽  
Burkina Faso ◽  
Randomized Trial ◽  
Water Storage ◽  
Cluster Randomized Trial ◽  
Storage Container ◽  
Safe Storage ◽  
Safe Water ◽  
Sustained Use ◽  
Cluster Randomized

Abstract Safe water storage protects household drinking water from microbial contamination, maintaining water quality and preventing diarrhea and other water-borne diseases. However, achieving high adoption and sustained use of safe storage is challenging. Systematic adaptation can address these challenges by improving contextual fit while retaining core functionality to protect water quality. We applied Plan-Do-Study-Act (PDSA) cycles to systematically adapt a safe water storage container (SWSC) intervention for implementation in rural Burkina Faso. This study describes the adaptation process and the impacts of the SWSC on Escherichia coli contamination in household stored water in a cluster-randomized trial with 49 intervention villages (274 households) and 50 no-intervention control villages (290 households). SWSC adoption among intervention households was high (88.9%). The intervention achieved approximately a 0.4 log reduction in E. coli contamination. Intervention impact was likely moderated by differential changes in improved source use across intervention and control households. Safe storage improves water quality when used consistently. PDSA frameworks can guide the adaptation of safe storage interventions to optimize adoption and sustained use in new contexts while preserving core functions that protect water quality.

Water Quality of Swimming Pools in Jerusalem

1993 ◽  
Vol 27 (7-8) ◽  
pp. 287-294 ◽  
Author(s):  
S. Lerman ◽  
O. Lev ◽  
A. Adin ◽  
E. Katzenelson
Keyword(s):  
Water Quality ◽  
Fecal Coliforms ◽  
Pathogenic Microorganisms ◽  
Swimming Pools ◽  
Indicator Organisms ◽  
Indicator Microorganisms ◽  
E Coli ◽  
Safe Water ◽  
Indirect Information

The Israel Ministry of Health is now revising its regulations for the assurance of safe water quality in public swimming pools. Since it is not possible to monitor each of the pathogenic microorganisms, it is often recommended to monitor indicator bacteria which provide indirect information on the water quality in the swimming pool. Three indicator microorganisms are often recommended: coliform counts (total coliforms, fecal coliforms or E. Coli), staphylococcus aureus and pseudomonas aeruginosa. A four year survey of the water quality of swimming pools in the Jerusalem District was conducted in order to determine whether the monitoring of all three indicators is necessary to assure safe water quality or is it sufficient to monitor only a single microorganism. A statistical analysis, conducted by using several different statistical techniques, reveals that the populations of the three indicator organisms are significantly interdependent but the correlations between each pair of these indicators are not sufficient to base a prediction of any of the organisms based on the measurements of the others. Therefore, it is concluded that monitoring of all three indicators should be recommended in order to provide an adequate picture of the water quality in swimming pools.

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