A 17-Month Evaluation of a Chlorine Dioxide Water Treatment System to Control Legionella Species in a Hospital Water Supply

2003 ◽  
Vol 24 (8) ◽  
pp. 575-579 ◽  
Author(s):  
Arjun Srinivasan ◽  
Gregory Bova ◽  
Tracy Ross ◽  
Karen Mackie ◽  
Nicholas Paquette ◽  
...  
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
Chlorine Dioxide ◽  
Environmental Protection Agency ◽  
Cold Water ◽  
Water Levels ◽  
Metal Corrosion ◽  
Treatment System ◽  
Water Treatment System ◽  
Legionella Species

AbstractObjective:To assess the safety and efficacy of a chlorine dioxide water treatment system in controlling Legionella in a hospital water supply.Design:For 17 months following installation of the system, we performed regular water cultures throughout the building, assessed chlorine dioxide and chlorite levels, and monitored metal corrosion.Results:Sites that grew Legionella species decreased from 41% at baseline to 4% (P = .001). L. anisa was the only species recovered and it was found in samples of both hot and cold water. Levels of chlorine dioxide and chlorite were below Environmental Protection Agency (EPA) limits for these chemicals in potable water. Further, enhanced carbon filtration effectively removed the chemicals, even at chlorine dioxide levels of more than twice what was used to treat the water. After 9 months, corrosion of copper test strips exposed to the chlorine dioxide was not higher than that of control strips. During the evaluation period, there were no cases of nosocomial Legionella in the building with the system, whereas there was one case in another building.Conclusions:Our results indicate that operation of a chlorine dioxide system effectively removed Legionella species from a hospital water supply. Furthermore, we found that the system was safe, as levels of chlorine dioxide and chlorite were below EPA limits. The system did not appear to cause increased corrosion of copper pipes. Our results indicate that chlorine dioxide may hold promise as a solution to the problem of Legionella contamination of hospital water supplies.

scholarly journals Evaluation of a chlorine dioxide water treatment system to control Legionella species in a hospital water System

2015 ◽  
Vol 48 (2) ◽  
pp. S137
Author(s):  
Yao-Ru Tseng ◽  
Tsen - Lu Cho ◽  
Kuei-Chu Li ◽  
Hsiu-Shen Lin ◽  
Kao-Pin Hwang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Chlorine Dioxide ◽  
Water System ◽  
Treatment System ◽  
Water Treatment System ◽  
Legionella Species

Feasibility of solar-powered ultrafiltration membrane water treatment systems for rural water supply in Malaysia

2019 ◽  
Vol 19 (6) ◽  
pp. 1758-1766
Author(s):  
Chun Ming Chew ◽  
K. M. David Ng
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
Life Cycle Cost ◽  
Ultrafiltration Membrane ◽  
Treatment System ◽  
Operational Parameters ◽  
Water Treatment System ◽  
Rural Villages ◽  
Cross Flow Filtration ◽  
Solar Powered

Abstract According to the World Bank's collection of development indicators, in 2017 approximately 25% of Malaysia's population were living in rural villages. Some of these villages are currently without electricity from the national grid and public piped water supply. In this study, a solar-powered ultrafiltration membrane water treatment system was installed at a rural village in Perak, Malaysia, to identify its feasibility. The ultrafiltration system was evaluated and compared with a conventional sand/media filtration water treatment system at the same location. Various aspects of both systems such as operational parameters, life-cycle cost and carbon emissions have been analyzed under this study. The distinct advantages of the ultrafiltration system include better filtrate turbidity quality (below 0.4 NTU), and lower operational cost and carbon emission. By utilizing a cross-flow filtration operation mode, the UF system does not require a daily intermittent backwash sequence, unlike the conventional system, to further simplify the daily operational routine. Accessibility of clean water supply for all has been heavily emphasized by the United Nations General Assembly (under sustainable development goal number 6) to ensure public health. This comprehensive study highlights the feasibilities of solar-powered ultrafiltration membrane water treatment systems for rural villages in Malaysia.

scholarly journals APLIKASI TEKNOLOGI PENGADAAN AIR BERSIH DI EMPAT DESA TERTINGGAL DI BENGKULU SELATAN

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Petrus Nugro Rahardjo
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
Electric Energy ◽  
Shallow Groundwater ◽  
Cell System ◽  
Treatment System ◽  
Clean Water ◽  
Water Treatment System ◽  
Coral Sand ◽  
The Media

In County South Bengkulu there are 4 villages classified into poor villages. Those villages do not have some principal facilities yet, such as clean water supply system and electricity. To fulfill clean water need, the people use shallow groundwater which has very bad quality. The groundwater contains Fe (1.7 ppm) and Mn (0.7 ppm). The contents are much more than the standard quality allowed by WHO. The groundwater colour is also a little bit brown. To deal with those problems, BPPT (Agency for the Assessment and Application of Technology) has tried to apply a water treatment system which is supported by a solar cell system producing the electricity. The electric energy is used for pumping the groundwater. The water treatment has a mainly important process which is accommodated in a multy media filter. The media include coarse coral, find coral, sand silica, manganese zeolite and activated carbon. The media filter can reduce the contaminants (Fe Mn) and remove the odour effectively. The complete water treatment system has been applied successfully in the 4 villages (one for each village).    Keywords : Clean Water Supply Technology.

scholarly journals Evaluation of a new water treatment for point-of-use household applications to remove microorganisms and arsenic from drinking water

2003 ◽  
Vol 1 (2) ◽  
pp. 73-84 ◽  
Author(s):  
Philip F. Souter ◽  
Graeme D. Cruickshank ◽  
Melanie Z. Tankerville ◽  
Bruce H. Keswick ◽  
Brian D. Ellis ◽  
...  
Keyword(s):  
Developing Countries ◽  
Drinking Water ◽  
Water Treatment ◽  
Environmental Protection Agency ◽  
Treatment System ◽  
World Health ◽  
Water Treatment System ◽  
Point Of Use ◽  
Field Samples ◽  
Parasitic Pathogens

Contamination of drinking water by microorganisms and arsenic represents a major human health hazard in many parts of the world. An estimated 3.4 million deaths a year are attributable to waterborne diseases. Arsenic poisoning from contaminated water sources is causing a major health emergency in some countries such as Bangladesh where 35 to 77 million people are at risk.The World Health Organization (WHO) has recently recognized point-of-use water treatment as an effective means of reducing illness in developing country households. A new point-of-use water treatment system that is based on flocculation, sedimentation and disinfection was evaluated for the removal of bacterial, viral and parasitic pathogens as well as arsenic from drinking water to estimate its potential for use in developing countries.Tests were conducted with United States Environmental Protection Agency (EPA)-model and field- sample waters from developing countries. Samples were seeded with known numbers of organisms, treated with the combined flocculation/disinfection product, and assayed for survivors using standard assay techniques appropriate for the organism.Results indicated that this treatment system reduced the levels from 108/l to undetectable (<1) of 14 types of representative waterborne bacterial pathogens including Salmonella typhi and Vibrio cholerae. No Escherichia coli were detected post-treatment in 320 field water samples collected from five developing countries. In addition, the water treatment system reduced polio and rotavirus titres by greater than 4-log values. Cyrptosporidium parvum and Giardia lamblia inocula were reduced by greater than 3-log values following use of this water treatment system. Arsenic, added to laboratory test waters, was reduced by 99.8%, and naturally occurring arsenic in field samples from highly contaminated Bangladeshi wells was reduced by 99.5% to mean levels of 1.2 µg/l.This water treatment system has demonstrated the potential to provide improved drinking water to households in developing countries by removing microbial and arsenic contaminants.

scholarly journals Evaluating the Efficacy of Point-of-Use Water Treatment Systems Using the Water Quality Index in Rural Southwest China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 867
Author(s):  
Zejin Zhang ◽  
Wei Zhang ◽  
Xi Hu ◽  
Kexin Li ◽  
Pengfei Luo ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Water Treatment ◽  
Water Supply ◽  
Reverse Osmosis ◽  
Service Time ◽  
Filter Element ◽  
Treatment System ◽  
Water Treatment System ◽  
Point Of Use

Rural China faces a shortage of safe drinking water. There are significant challenges associated with small centralized water supply systems and decentralized water supply systems. Many rural residents use point-of-use water treatment systems to ensure the safety of their drinking water. The actual water purification effect and applicability of these water treatment systems in small centralized and decentralized water supply systems need to be determined urgently. In this study, the water quality index (WQI) method was applied for the first time in rural areas to evaluate the effectiveness of point-of-use water treatment systems. A total of 67 reverse osmosis water treatment systems were tested. The rate of compliance with drinking water standards of the decentralized water supply was low (37%). Compared with untreated water, the use of a reverse osmosis water treatment system improved the rate of compliance with drinking water standards, but this effect was not satisfactory (8%). Among the factors potentially affecting the purified water quality of point-of-use water treatment systems (e.g., service time of the water treatment system, service time of the filter element, and type of water source), the service time of the filter element had the most significant influence on the water quality. If the filter element had not been replaced for a long period, the removal effect of the water treatment system on the total hardness, sulfide, copper, and ammonia nitrogen was significantly affected, reducing the quality of the purified water. To ensure the safety of drinking water, it is recommended to replace the filter element of a reverse osmosis water treatment system at least once a year.

Improvement of Lake Water Quality by using Moving Rapid Water Treatment System

2018 ◽  
Vol 18 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Kwang-Hee Lee ◽  
◽  
Min-Ho Kim ◽  
Nam-Woo An ◽  
Chul-hwi Park
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Lake Water ◽  
Treatment System ◽  
Lake Water Quality ◽  
Water Treatment System

Multiplication of a Klebsiella pneumoniae Strain in Water at Low Concentrations of Substrates

1988 ◽  
Vol 20 (11-12) ◽  
pp. 117-123 ◽  
Author(s):  
D. van der Kooij ◽  
W. A. M. Hijnen
Keyword(s):  
Amino Acids ◽  
Water Treatment ◽  
Klebsiella Pneumoniae ◽  
Substrate Concentration ◽  
Treatment System ◽  
Water Treatment System ◽  
Low Concentrations ◽  
Ks Values ◽  
Substrate Concentrations

A K.pneumoniae strain, isolated from a water treatment system, was tested in growth measurements for its ability to multiply at substrate concentrations of a few micrograms per liter. The organism multiplied on mixtures of carbohydrates and amino acids at a substrate concentration of 1 µg of C of each compound per liter. Tests with individual compounds revealed that especially carbohydrates were utilized at low concentrations. The Ks values obtained for maltose and maltopentaose were 53 µg of C/l and 114 µg of C per liter, respectively. The significance of the growth of K.pneumoniae at low substrate concentrations is discussed.

High Performance Hybrid Capacitive Deionization with Ag-coated Activated Carbon Electrode

2021 ◽  
Author(s):  
Hongsik Yoon ◽  
Jiho Lee ◽  
Taijin Min ◽  
Gunhee Lee ◽  
Minsub Oh
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Industrial Application ◽  
High Performance ◽  
Treatment System ◽  
Carbon Electrode ◽  
Capacitive Deionization ◽  
Water Treatment System

Capacitive deionization (CDI) has been highlighted as a promising electrochemical water treatment system. However, the low deionization capacity of CDI electrodes has been a major limitation for its industrial application,...

scholarly journals Development of a schwarzite-based moving bed 3D printed water treatment system for nanoplastic remediation

RSC Advances ◽  
2021 ◽  
Vol 11 (32) ◽  
pp. 19788-19796
Author(s):  
Bramha Gupta ◽  
Rushikesh S. Ambekar ◽  
Raphael M. Tromer ◽  
Partha Sarathi Ghosal ◽  
Rupal Sinha ◽  
...  
Keyword(s):  
Water Treatment ◽  
Aquatic Ecosystem ◽  
Treatment System ◽  
Environmental Challenges ◽  
Moving Bed ◽  
Water Treatment System ◽  
3D Printed ◽  
The Impact

The impact of micro and nanoplastic debris on our aquatic ecosystem is among the most prominent environmental challenges we face today.

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