drinking water bacteria Articles
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Occurrence of toxic cyanobacteria and microcystin toxin in domestic water storage reservoirs, Egypt
Residents in many developing countries store treated drinking water in tanks or reservoirs because of intermittent and infrequent water supplies. Many studies have focused on bacterial contamination of domestic reservoir waters, the cyanobacterial and algal contamination is largely unexplored. Therefore, the present study investigates toxic cyanobacteria and their microcystin (MC) toxins in ...
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Aggregation and biofilm formation of bacteria isolated from domestic drinking water
The objective of this study was to investigate the autoaggregation, coaggregation and biofilm formation of four bacteria namely Sphingobium, Xenophilus, Methylobacterium and Rhodococcus isolated from drinking water. Auto and coaggregation studies were performed by both qualitative (DAPI staining) and semi-quantitative (visual coaggregation) methods and biofilms produced by either pure or ...
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Bacteriological assessment of drinking water supply options in coastal areas of Bangladesh
This study was conducted to assess the bacteriological quality of alternative drinking water supply options in southwest coastal areas of Bangladesh. A total of 90 water samples were collected during both dry and wet seasons from household based rainwater harvesting systems (RWHSs), community based rain water harvesting systems (CRWHSs), pond-sand filters (PSFs) and ponds. The samples were ...
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Impact of biofilms in simulated drinking water and urban heat supply systems
Biofouling and biocorrosion were studied in drinking water and heating water systems by forming biofilms on steel and on polymethylmetacrylate. In the drinking water system, biofilm development was more significant on corroded surfaces, suggesting that in these conditions they were largely protected from disinfection, probably because of sheltering and chlorine demand by corrosion products. In ...
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Long Lake Colony Case Study
Long Lake Colony Farm is an 1,800-head swine operation located in Wetonka, South Dakota that uses a 25,000 gallon per day capacity well-water system. Preliminary testing of the system showed elevated bacteria levels in the farm’s water. The water quality also contributed to clogged water lines in the animal drinking system. The bacteria and water line issues resulted in strep problems in ...
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The impact of cyanobacteria on growth and death of opportunistic pathogenic bacteria
Climate change may cause increased microbial growth in water sources and more knowledge is required on how this may affect the hygienic water quality, i.e., whether increased occurrence of cyanobacteria and algae may stimulate the growth rate of opportunistic pathogenic bacteria. Laboratory experiments were performed to investigate if the presence of the cyanobacteria Anabanea lemmermannii and ...
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An improved method for determining microbially available phosphorus in drinking water
Microbially available phosphorus (MAP) is the labile phosphorus that is readily assimilated by microorganisms, which is linearly correlated to bacterial re-growth in drinking water in some regions. The conventional MAP bioassay for drinking water was originally developed by Markku based on the growth potential of Pseudomonas fluorescens P17 (P17). However, the bioassay bears some demerits, ...
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Care Oxfam-DelAgua Kit Case Study - Yemen
Generally water quality testing is done to monitor the maintenance and operation of drinking water systems. In Yemen CARE uses the DelAgua water testing kit (developed by OXFAM, reproduced by the Robens Centre for Public and Environmental Health, Surrey University) as an awareness tool to improve the understanding of ‘clean and safe water’ in village communities. “We have ...
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Case study Madagascar - independent drinking water solution
Client ADES Solaire, Switzerland (NGO) Location ADES Centre in St. Augustin, Madagascar Introduction The island Madagascar is suffering from a high rate of poverty. Most of the people have no access to clean drinking water. In 2009 ADES and its supporters established a pilot project for the use of renewable energy for electrification in urban and rural areas. The project targets a successful ...
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Methods for microbiological quality assessment in drinking water: a comparative study
The present study aimed to compare several methods for quantifying and discriminating between the different physiological states of a bacterial population present in drinking water. Flow cytometry (FCM), solid-phase cytometry (SPC), epifluorescence microscopy (MSP) and culture method performances were assessed by comparing the results obtained for different water samples. These samples, ...
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Dangers of Chlorine
Most of us have grown up with the idea that whiter whites (and brighter colors) mean cleaner clothes. We continue to use chlorine products with abandon to whiten and to disinfect. We write on white paper and bathe in and drink chlorinated water. After all, who wants bacteria-infested water? In our society, chlorine is ubiquitous-and so are its side effects. In fact, the long-term residual effects ...
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Quantitative real-time PCR does not reliably detect single fecal indicator bacteria in drinking water
The microbial quality of drinking and environmental water is usually determined by culture-based detection of fecal indicator bacteria according to ISO reference methods 16649-1 and 7899-2, respectively. Because of an increasing demand for rapid, culture-independent methods, we tested three quantitative polymerase chain reaction (qPCR) approaches for the simultaneous detection of both, ...
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Reference pathogen numbers in urban stormwater for drinking water risk assessment
Targeted stormwater event-based monitoring of adenovirus, Cryptosporidium and Campylobacter, the human health reference pathogens of viruses, protozoa and bacteria, respectively, was undertaken to determine numbers prior to water recycling via an aquifer. This allowed the determination of a 95th percentile of reference pathogen numbers in stormwater (2 n/L for adenoviruses, 1.4 n/L for ...
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Pathogenic features of heterotrophic plate count bacteria from drinking-water boreholes
Evidence suggests that heterotrophic plate count (HPC) bacteria may be hazardous to humans with weakened health. We investigated the pathogenic potential of HPC bacteria from untreated borehole water, consumed by humans, for: their haemolytic properties, the production of extracellular enzymes such as DNase, proteinase, lipase, lecithinase, hyaluronidase and chondroitinase, the effect ...
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Chlorine Theory & Measurement
Chlorine, dissolved in liquid is one of the most effective and economical semi-killers for the treatment of water to make it potable or safe to drink. Chlorine's powerful disinfectant qualities come from its ability to bond with and destroy the outer surfaces of bacteria and viruses. Drinking water chlorination is one of the most widely used methods to safeguard chinking water supplies. In ...
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Neighborhood diversity of potentially pathogenic bacteria in drinking water from the city of Maroua, Cameroon
This study examined the spatial variation of potential gastrointestinal pathogens within drinking water sources and home storage containers in four neighborhoods in Maroua, Cameroon. Samples were collected from source (n= 28) and home containers (n= 60) in each study neighborhood. Pathogen contamination was assessed using quantitative polymerase chain reaction, targeting Campylobacter spp., ...
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Evidence Shows Need to Address Pathogenic Bacteria in U.S. Drinking Water Systems
Legionnaires’ disease is on the rise. Unfortunately, efforts to prevent Legionnaires’ disease to date have focused on building water systems rather than the municipal water supply. Building water systems are too far downstream to correct the problem, and, as a result, these efforts have been ineffective in curbing the incidence of legionellosis. It is unrealistic to place on building ...
By Evapco Inc.
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Occurrence of
Aeromonas spp. in a random sample of drinking water distribution systems in the USAAeromonads are aquatic bacteria found in drinking water supplies worldwide. Some species, such as Aeromonas hydrophila, can cause disease in humans. For this survey, 293 United States public water systems were selected using random sampling, stratified by water source and system type. Water samples were collected during one year from three sites (six samples per site) in each system. Temperature, ...
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What are the 8 water quality testing parameters?
Water is an essential resource, and its quality is vital to ensure the well-being of individuals and the environment. Therefore, water quality testing is a crucial process that needs to be conducted periodically to assess the suitability of water for various purposes. In this blog post, we will discuss the eight parameters that are commonly tested to determine water quality. 1. pH Level The pH ...
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Coliform Bacteria in Water and Sewage
https://www.yasa.ltd/post/coliform-bacteria-in-water-and-sewage-how-to-remove-it Safe drinking water is essential for maintaining good health. Coliform bacteria serve as indicators of water quality, helping to identify potential risks associated with fecal contamination. Understanding the significance of coliform bacteria and their role in sewage treatment is crucial in ensuring the safety of ...
By YASA ET
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