drinking water additive Articles
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Rainwater suitable as replacement for tap water in individual cases
A Parliamentary initiative (10.503) launched by National Councillor Adèle Thorens Goumaz (Greens) calls for rainwater to be used more extensively for purposes that do not require drinking water quality. The initiator is hoping to reduce the consumption of drinking water as a result. In addition, the initiative is seeking to increase the amount of rainwater that percolates into the soil. ...
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Updating national standards for drinking-water: a Philippine experience
The latest version of the Philippine National Standards for Drinking-Water (PNSDW) was issued in 2007 by the Department of Health (DOH). Due to several issues and concerns, the DOH decided to make an update which is relevant and necessary to meet the needs of the stakeholders. As an output, the water quality parameters are now categorized into mandatory, primary, and secondary. The ten ...
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Disinfection by-products in drinking water – a case study on Calgary, Alberta, Canada
Disinfection by-products (DBPs) have been monitored in Calgary's drinking water for approximately 15 years. The variability of the DBPs has typically exhibited similar patterns over the period of monitoring. Due to the nature of the surface waters supplying the water treatment plants, the level of DBPs was largely influenced by surface runoff events where the level of natural organic matter (NOM) ...
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Application of high flux brackish water thin film composite membranes in the desalination of highly saline ground water
The improvements in flux and membrane designs have enabled us to install smaller and economical two-stage reverse osmosis systems suitable for small village communities situated near coastal areas to provide safe drinking water. In addition, the advent of higher productivity and better salt rejection membranes has allowed us to operate the systems at low pressure in both stages. Our two-stage ...
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How the Aquamonitrix real-time nitrate and nitrite analyser allowed a drinking water supplier to lift a long-standing Do Not Consume notice - Case Study
Compared with market-leading UV-based nitrate analysers, Aquamonitrix offers a key advantage in statutory limit monitoring applications at the outlet of drinking water treatment plants. In addition to providing high-accuracy, real-time nitrate monitoring, Aquamonitrix simultaneously provides a specific, high accuracy real-time nitrite measurement, with a lower limit of detection of just 0.05 ...
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Quality assessment of rooftop runoff and harvested rainwater from a building catchment
A major obstacle to the promotion of rainwater harvesting is chemical and microbiological concerns. To determine its suitability as an alternative water resource, water quality parameters such as pH, turbidity and metal ion concentrations and counted total coliform, Escherichia coli and heterotrophic bacteria were measured. It was observed that the stored rainwater had a neutral average pH and ...
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Water pollution
Water pollution is a major problem in the global context. It has been suggested that it is the leading worldwide cause of deaths and diseases,1,2 and that it accounts for the deaths of more than 14,000 people daily.2 An estimated 700 million Indians have no access to a proper toilet, and 1,000 Indian children die of diarrheal sickness every day.3 Some 90% of China's cities suffer from ...
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Reverse osmosis: Whether a concern over the removal of minerals or not?
Reverse Osmosis will generally remove salt, manganese, iron, flouride, lead, and calcium (Binnie et. al., 2002). Most mineral constituents of water are physically larger than water molecules and they are trapped by the semi-permeable membrane and removed from drinking water when filtered through a RO (AllAboutWater.org, 2004). Meanwhile, consumers are concerned about the removal of minerals ...
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Optimization of UV/H2O2 processes for the removal of organic micropollutants from drinking water: effect of reactor geometry and water pretreatment on EEO values
Increasing concentrations of organic micropollutants, like pharmaceuticals, in surface water may require additional treatment for drinking water production. The UV/H2O2 process is very effective for this purpose, but is known for its relatively high energy demand. This energy demand may be decreased by improving the water matrix composition and/or by optimizing UV reactor geometry. Thus, ...
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Understanding residential rainwater harvesting
We use the phrases rainwater harvesting, rainwater utilization, and rainwater collection to describe the process of collecting and using rainwater as an alternative or supplemental water source. Rainwater harvesting is typically restricted to non-potable (Not for Drinking) applications like: landscape irrigation, vehicle washing, toilet flushing, laundry, cleaning and custodial services, process ...
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Pharmaceuticals in water fact sheet
Recent events have led to a growing concern regarding trace pharmaceutical compounds found in drinking supplies across the United States. While pharmaceuticals have been detected in amounts far below the levels considered harmful to humans and there is no evidence demonstrating these pharmaceuticals pose a significant health risk to humans, we understand many consumers will want to protect their ...
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Why PPR has several colors: green, gray, white or other colors. What are the differences?
As it is known, there are several manufacturers worldwide, from America to Romania. Each manufacturer has their own system of colors and lines. In fact, this is a market strategy. This means that if no special materials are used in the production of PPR, the color is not very important, except for the color black. PPR as a raw material exists in several forms. It is generally called PP-R or ...
By SupraTherm
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Arsenic from community water fluoridation: quantifying the effect
Community water fluoridation is a WHO recommended strategy to prevent dental carries. One debated concern is that hydrofluorosilicic acid, used to fluoridate water, contains arsenic and poses a health risk. This study was undertaken to determine if fluoridation contributes to arsenic in drinking water, to estimate the amount of additional arsenic associated with fluoridation, and compare this ...
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Drinking Surface Water Pilot - Case Study
Bowen Island Municipality’s Cove Bay Water System (CBWS) treats surface water from Grafton Lake to drinking water. Historically, the lake water was treated with hypochlorite addition however this treatment is insufficient to meet the Canadian Drinking Water Quality Guidelines (CDWQG) for several parameters including protozoa, turbidity, manganese and colour. ...
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The role of chemicals in this thirsty planet
Abstract As all the chemical elements and most of their attributable compounds are known there is little scope for further discovery in the science of ‘inorganic’ chemistry. ‘Organic’ chemistry is much more exiting as it is based on carbon which can polymerise into a multitude of different compounds and different shapes. Because the number of carbon-based molecules is ...
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Water Stress: Most at-Risk UK Cities Revealed
The UK cities facing the highest risks of water stress by 2040 have been revealed, with Lancaster in Lancashire emerging as the most likely to experience water-related issues by then, in line with climate change, population growth and water usage and consumption habits. Carried out by Sanctuary Bathrooms, the study – reported on by the Scotsman – found that Northampton, Peterborough, ...
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Magnesium in drinking water – a case for prevention?
Studies in many countries have demonstrated a relationship between drinking water mineral content and the risk of death in cardiovascular disease (CVD). Particularly strong relationships have been found for magnesium and it has been suggested that magnesium be added to drinking water. The aim of this article is to evaluate the validity of this suggestion by reviewing information on possible ...
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Potsdam Wastewater Treatment Works, Milnerton, South Africa - Case Study
Due to significant yearly increases in flow, the Cape Town City Council decided in 2004 to expand its capacity from 35 Ml/d (million litres per day) to 47 Ml/d. The older section of the works, which consisted of bio filters, were closed down due to effluent not complying with the standard set by the Department of Water Affairs. Aurecon was appointed to carry out the feasibility investigation, ...
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Soy entering valuable wetlands of the Paraná Delta, Argentina
Due to the enormous emphasis on soybean cultivation within Argentina, activities such as cattle raising but also the cultivation of soybeans are increasingly pushed to more marginal and vulnerable areas, where the cost of land is lower. The Paraná Delta, one of the most unique and important wetlands regions in the world, is one of these places. Although the region is not suitable for ...
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Facts about Fluoride in Water
Previously, the only route of exposure to fluoride was by drinking water or food that contained natural sources of fluoride. Currently, exposure to fluoride comes from more sources including fluoridated dental products such as toothpaste and mouthwash, as well as the addition of fluoride to drinking water, for reducing tooth decay. Some bottled water products (such as spring water) can contain ...
By WECO Filters
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