scholarly journals The effectiveness of disinfection and flushing procedures to prevent coliform persistence in aircraft water systems

2018 ◽  
Vol 19 (5) ◽  
pp. 1339-1346
Author(s):  
Jeffrey Szabo ◽  
Mark Rodgers ◽  
Jatin Mistry ◽  
Joshua Steenbock ◽  
John Hall
Keyword(s):  
Drinking Water ◽  
Chlorine Dioxide ◽  
Glycolic Acid ◽  
Tap Water ◽  
Water System ◽  
Water Systems ◽  
Full Scale ◽  
Free Chlorine ◽  
Drinking Water System ◽  
The One

Abstract A full-scale reproduction of an aircraft drinking water system was conditioned using municipal tap water with a mixture of free chlorine and chloramines, and subsequently contaminated with coliforms. Disinfection was undertaken using chlorine dioxide, ozone and a mixed oxidant solution followed by flushing until no disinfectant residual remained. Results showed that coliforms were not persistent on the aircraft plumbing surfaces, and coliforms were not detected after disinfection and flushing with any disinfectant. The one exception was the aerator installed in the lavatory faucet, which was coliform positive after disinfection with ozone and mixed oxidants. These data suggest that the faucet aerators could be a source of coliform contamination that may result in coliform positive samples. Further experiments conducted on disinfection of aerators with glycolic acid and quaternary ammonia (both commonly used by the airlines) showed no detectable coliforms on coliform contaminated aerators after 30 minutes of soaking in the disinfectants.

scholarly journals Design of drinkable tap water system at X Apartment, Jakarta

2018 ◽  
Vol 197 ◽  
pp. 13009
Author(s):  
Hariastuti Prameswari ◽  
Tazkiaturrizki ◽  
R Ratnaningsih
Keyword(s):  
Drinking Water ◽  
Tap Water ◽  
Water System ◽  
Clean Water ◽  
Water Tank ◽  
Drinking Water System ◽  
Investment Cost ◽  
Tank System ◽  
The Cost ◽  
System Water

This design aims to contrive a plumbing system X Apartment, Jakarta with a separate clean water and drinking water system. Water supply system that applied to this apartment is roof tank system. Fluctuations in the use of clean water are used to determine the capacity of reservoirs and pumps using the equivalent apartments such as The Bellagio Residence Apartment, Four Winds Apartment, Tamansari Sudirman Apartment, and Setiabudi Residence Apartment. Total demand for clean water for the 1st and 2nd tower is 315.8 m3/day and 39 m3/day for drinking water with 216 m3 of ground water tank capacity. Transfer pumps work for 12 hour/day and the capacity of clean water roof tank for the 1st and 2nd tower are 67.5 m3 while for drinking water roof tank are 7.2 m3. System that has been chosen used 2 stand pipes for both clean water, drinking water, and booster pumps in each tower. This design concluded that The investment cost of clean water and drinking water system and also the construction of X Apartment reservoirs is Rp. 2.393.889.860 and the cost of drinking water that can be saved by residents when using drinkable tap water system is Rp. 874.656 per m3.

N-nitrosamine formation by monochloramine, free chlorine, and peracetic acid disinfection with presence of amine precursors in drinking water system

Chemosphere ◽  
2016 ◽  
Vol 153 ◽  
pp. 521-527 ◽  
Author(s):  
Danielle M. West ◽  
Qihua Wu ◽  
Ariel Donovan ◽  
Honglan Shi ◽  
Yinfa Ma ◽  
...  
Keyword(s):  
Drinking Water ◽  
Peracetic Acid ◽  
Water System ◽  
Free Chlorine ◽  
Drinking Water System

Disinfection of bacteria in water systems by using electrolytically generated copper:silver and reduced levels of free chlorine

1990 ◽  
Vol 36 (2) ◽  
pp. 109-116 ◽  
Author(s):  
Moyasar T. Yahya ◽  
Lee K. Landeen ◽  
Maria C. Messina ◽  
Susan M. Kutz ◽  
Richard Schulze ◽  
...  
Keyword(s):  
Drinking Water ◽  
Key Words ◽  
Tap Water ◽  
Total Coliform ◽  
Water Systems ◽  
Free Chlorine ◽  
Drinking Water Standards ◽  
Indoor And Outdoor

As an alternative disinfectant to chlorination, electrolytically generated copper:silver (400 and 40 μg/L copper and silver, respectively) with and without free chlorine (0.3 mg/L) was evaluated over a period of 4 weeks in indoor and outdoor water systems (100 L tap water with natural body flora and urine). Numbers of total coliform, pseudomonas, and staphylococci were all less than drinking water standards in systems treated with copper:silver and free chlorine and systems treated with free chlorine alone (1.0 mg/L). No significant differences (p ≤ 0.05) in bacterial numbers were observed between systems with copper:silver and free chlorine and those with free chlorine alone. Overall, free-chlorine treatments (0.3 or 1.0 mg/L) showed significantly lower heterotrophic plate numbers than those without free chlorine. When challenged with a natural Staphylococcus sp. isolate, water with copper:silver and free chlorine had a 2.4 log10 reduction in bacterial numbers within 2 min, while free chlorine alone or copper:silver alone showed 1.5 and 0.03 log10 reductions, respectively. Addition of copper:silver to water systems may allow the concentration of free chlorine to be reduced while still providing comparable sanitary quality of the water. Key words: disinfection, water, copper, silver, chlorine.

scholarly journals Full Scale Drinking Water System Decontamination

Opflow ◽  
2017 ◽  
Vol 109 ◽  
pp. E535-E547 ◽  
Author(s):  
Jeffrey Szabo
Keyword(s):  
Drinking Water ◽  
Water System ◽  
Full Scale ◽  
Drinking Water System

scholarly journals Towards a Sustainable Small Non-Community Drinking Water System in Ontario: Owners’ Risk Awareness and Perceptions to Water Safety

2018 ◽  
Vol 11 (3) ◽  
pp. 71 ◽  
Author(s):  
Mehmet Fatih Sekercioglu ◽  
Jerry White ◽  
Dan Shrubsole ◽  
Jamie Baxter
Keyword(s):  
Drinking Water ◽  
Water System ◽  
Water Source ◽  
Water Systems ◽  
Research Approach ◽  
Risk Awareness ◽  
Water Safety ◽  
Drinking Water System ◽  
Study Results ◽  
Drinking Water Systems

In Ontario, small non-community drinking water systems are defined as systems that make drinking water available to the public and are not connected to a community drinking water system. This study, using qualitative research approach, examines the risk awareness and perceptions of small non-community drinking water system owners in providing safe drinking water to their clients and protecting their water source. Our study yields the need for developing a sustainable operation model for small non-community drinking water systems. The study results provide recommendations to the regulatory agency for effective and efficient administration of the program such as offering customized and affordable training opportunities and developing effective communication strategies for owners and operators.

A methodology for identifying vulnerable locations to taste and odour problems in a drinking water system

2007 ◽  
Vol 55 (5) ◽  
pp. 177-183 ◽  
Author(s):  
F. Proulx ◽  
M.J. Rodriguez ◽  
J. Sérodes ◽  
C. Bouchard
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Spatial Information ◽  
Tap Water ◽  
Water System ◽  
Mail Survey ◽  
Water Quality Monitoring ◽  
Geographical Information ◽  
Spatial Approach ◽  
Drinking Water System

In this research, methodology was developed to identify locations vulnerable to taste and odour problems in a distribution system. The methodology was based on a multicriteria procedure combining spatial information on consumer complaints and popular perception of tap water. The first step in the described methodology consisted of mapping complaints regarding tap water made by the population between 2002 and 2004 using a geographical information system (GIS). The second step consisted of analysing results of a questionnaire-based mail survey, also through GIS. The information generated using the above steps was integrated using a multicriteria and spatial approach allowing segregation of the distribution system into delineated zones, according to their vulnerability to occurrences of taste and odour problems. The identification of vulnerable sectors in a distribution system will help water managers to implement a better-targeted water quality monitoring programme – one that considers odours and tastes of drinking water – within the management process.

scholarly journals Managing threats to small drinking water systems in Ontario : a risk based approach

2021 ◽  
Author(s):  
Wendy Johnson
Keyword(s):  
Risk Assessment ◽  
Drinking Water ◽  
Water System ◽  
Water Systems ◽  
Water Protection ◽  
Effective Management ◽  
Reasonable Person ◽  
Drinking Water System ◽  
Efficient Protection ◽  
Drinking Water Systems

Ultimately the goal of Justice O'Connor's recommendations from the Walkerton inquiry was "to ensure that Ontario's drinking water system deliver water with a level of risk so negligible that a reasonable person would feel safe drinking the water" (O'Connor, 2002a, 5). Following the implementation of Justice O'Connor's recommendations, concerns were raised regarding the management of small drinking water systems using the same stringent rules that were used for municipally-run water systems. Recommendations have focused on the need for risk assessment when managing the threats to small drinking water systems; however no such system has yet been developed in Ontario. A risk-based approach has been developed that would ensure drinking water protection activities are targeted to items that posed the greatest risk to water systems, resulting in more efficient protection efforts. The creation of such a risk-based program can be used to accurately identify significant threats to a water system and result in the effective management of health threats from small drinking water systems.

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