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Big Berkey Water Filters

  • New Radiation Testing Results for Black Berkey Filters

    After much anticipation, we are happy to announce the release of new radiation testing results for the black berkey filters.  Below, please find a summary of the 3 sets of black berkey radiation tests.

    Radiation in water Radiation in water, black berkey testing results

    Gross Alpha Reduction Testing Report <-- Link to 1st Set of Test Results

    The Gravity Black Berkey Filter reduced the Gross Alpha concentration in the tap water by at least 98.7 %. The EPA limit for Gross Alpha is 15 pCi/L; the Gravity Black Berkey Filter meets the EPA requirements for drinking water.

    Potential gross alpha contaminants/emitters in water:

    Americium-241
    Mendelevium-258
    Neptunium-237
    Plutonium-238 and -239
    Polonium-210
    Protactinium-231
    Radium-226 and -228
    Thorium-232
    Uranium-235 and -238

    Gross Beta Reduction Testing Report <-- Link to 2nd Set of Test Results

    The Gravity Black Berkey Filter reduced the Gross Beta concentration in the tap water by at least 95.3 %. The EPA limit for Gross Beta is 15 pCi/L; the Gravity Black Berkey Filter meets the EPA requirements for drinking water.

    Potential Gross Beta contaminants/emitters in water:

    Actinium-227
    Californium-251 and -252
    Cesium-137
    Cobalt-60
    Iodine-129 and -131
    Lead-210
    Nickel-63
    Promethium-145
    Strontium-90
    Technetium-99

    Uranium Reduction Test Report <-- Link to 3rd Set of Test Results

    The Gravity Black Berkey Filter reduced the Uranium concentration in the tap water by at least 97.0 %. The EPA limit for Uranium is 30 µg/L; the Gravity Black Berkey Filter meets the EPA requirements for drinking water.

  • Are Well Owners More Environmentally Conscious?

    Water well owners in Kansas tend to be more aware of issues relating to state water policies than citizens whose water is supplied by municipal water networks, a new study has found. This could in turn have implications for environmental policy and groundwater management, says Brock Ternes, a PhD student at the University of Kansas, who conducted the study for his doctoral thesis in sociology.

    For his study, Ternes conducted a survey interviewing 864 Kansas residents, questioning them about their water supply and water use habits, as well as their awareness to water related issues, including policy. He found that residents that depended on private wells for their water supply were more concerned with issues related to water depletion in the High Plains Aquifer — the underground aquifer that serves as a freshwater reservoir lying beneath a large portion of western Kansas — and tended to be significantly more informed about state water policies and more aware of key water management agencies than those who didn't own wells.

    "The people who use private wells for water are more likely to hear about water-related policy issues and pay attention to them," said Ternes, who will present his study at the 111th Annual Meeting of the American Sociological Association (ASA) this week.

    windmill

    He found, for example, that well owners were more knowledgeable about the proposed Kansas Aqueduct — an $18 billion waterworks project that would involve diverting water from the Missouri River to provide water to water scarce areas of western Kansas. Residents who didn't own wells tended to be less aware of this gigantic water project.

    Like many other regions that have been affected by recent droughts, rural Kansas has been suffering from water scarcity issues. Water extraction from the High Plains Aquifer, which is the primary source of groundwater for the region, has been excessive to meet irrigation demands of the agricultural sector, and researchers caution that wells in some areas of southwestern Kansas are likely to run dry in the next 25 years if pumping is not curtailed.

    Ternes' water survey also revealed that well owners considered water conservation a top priority to ensure they would still have water in the future. Ternes refers to the term 'groundwater citizenship' which encourages aquifer stewardship and concerted water conservation efforts to ensure groundwater supplies are not depleted so that there will still be water available in the future.

    "Most well owners believe securing water is one of the top political challenges facing Kansas, and water policies are more likely to influence their vote in local and state elections than Kansans who don't own wells," said Ternes. "My data suggest that well owners have different political priorities than non-well owners and conserve water with the hopes of extending their supply, which makes them a unique type of citizen."

    Ternes believes the study could provide valuable information to Kansas water officials and policymakers in looking for potential solutions for preventing the High Plains Aquifer from becoming depleted. If they grasp the significance of engaging with well owners who feel strongly about water conserving water, it can help boost public awareness of water conservation issues generally, bringing these important issues more into the limelight.

    "Water supply infrastructure is clearly connected to how in-tune people are with their natural resources, which is profoundly important for environmental policymaking and survival in the Anthropocene," Ternes said.

    Many states are vulnerable to water exploitation, which is exacerbated in times of drought. Yet water resources need to be managed appropriately to ensure water availability in the future. In this modern day and age, with improved technologies that allow us to readily access natural resources such as water, it may seem that water availability is much higher that what it really is, when in fact it is a finite resource that is now more scarce than ever.

    Reference

    The paper, "'Groundwater Citizenship' and Water Supply Awareness: Investigating Water-Related Infrastructure, the Kansas Aqueduct, and Well Ownership," will be presented on Monday, Aug. 22, at 8:30 a.m. PDT in Seattle at the American Sociological Association's 111th Annual Meeting.

  • 218 Million Americans Exposed to Dangerous Levels of Chromium-6 in Their Water & Berkey Will Remove It

    "There is scientific uncertainty regarding safe levels of this chemical in drinking water and possible long-term consequences of ingestion. But this new analysis from the Environmental Working Group, an independent advocacy group, examines evidence from water systems throughout the nation and concludes that the tap water of 218 million Americans contains levels of chromium-6 that the group considers dangerous." More details from CNN article here.

    Yes, the black berkey filters that come standard with our berkey systems do filter out and remove chromium 6 from the water.

    These berkey test results for chromium 6 can be found here.

    And don't forget, BigBerkeyWaterFilters.com is the only company to offer an exclusive extended lifetime warranty. More details here. This is not available from other sellers.

  • Huge Sinkhole Contaminates Florida Drinking Water

    A massive sinkhole that formed beneath a stack of hazardous waste material has resulted in roughly 215 million gallons of radioactive wastewater leaking into the aquifer below. The aquifer is a primary source of drinking water for millions of residents, while water that flows out of the aquifer enters springs and rivers that are popular for recreational pursuits such as swimming and kayaking.

    The incident occurred at a waste storage site of a fertilizer plant in New Wales, Florida. The company, Mosaic, first noticed that water levels in a wastewater pond at the stack had dropped significantly, and upon inspection, discovered a massive sinkhole with a diameter of 45 feet. The stack is used to store phosphogypsum, a radioactive waste byproduct that is produced when phosphate is used in the manufacture of fertilizers, which apparently is a common practice at industrial plants such as this.

    According to a statement released by Mosaic, the pond liner beneath the phosophogypsum stack was damaged when the sinkhole developed, resulting in the leakage from the pond above, which has not as yet been contained.

    "Based on the nature of the water loss and what we've learned so far," the sinkhole damaged the liner system at the base of a phosophogypsum stack, Mosaic said on Thursday. "The pond on top of the cell drained as a result" and "some seepage continues."

    According to a company spokesperson, it is believed that the sinkhole extends to the Floridan aquifer, which means that this water supply has been contaminated with around 215 million gallons of water that contains industrial pollutants used in the fertilizer manufacturing process, which have seeped into the hole.

    The company has taken steps to rectify the situation and possibly avoid further damage. According to a company statement:

    "We are working closely with regulators and have been reporting to FDEP daily. We have also called in top experts in the field to advise us on this issue. Enhanced water quality monitoring continues, and we are developing a comprehensive corrective action plan to address and rectify the cause of the water loss," the company added.

    "Mosaic immediately implemented additional and extensive groundwater monitoring and sampling regimens and has found no offsite impacts," the company said. Mosaic also "began pumping water out of the west cell" of the affected phosphogypsum stack "into an alternative holding area on site to reduce the amount of drainage", and has also "begun the process of recovering the water" that drained through the sinkhole "by pumping through onsite production wells," it said.

    The Florida Department of Environmental Protection (FDEP) have confirmed that the company has alerted both the DEP and the EPA of the incident that occurred at their facility, and has taken immediate action to investigate and implement remedial action, and keep both regulatory authorities updated on the status and progress. The FDEP is also carefully monitoring the situation, conducting frequent visits to the site to ensure that a "timely and appropriate response continues in order to safeguard public health and the environment."

    However, local residents are not convinced. Local news media reported that picketers from Polka County gathered outside the Mulberry City Hall on Saturday morning to protest the lack of preventative measures taken to protect their drinking water.

    While all the above efforts and responses are reactive rather than proactive, as consumers, we can take steps to ensure that the water we drink is free from contaminants. By investing in a good quality drinking water filter you can remove any unwanted pollutants — including many industrial pollutants — that may make their way into your water supply.

  • Bottled Water in High Demand by Thirsty Air Travelers

    For travelers and air commuters, the number one priority is keeping hydrated while in transit. According to a recent CNN report, bottled water is top of the list of most frequently purchased items in Hudson Travel Essential stores throughout the US.

    With over 950 stores serving 4 million travelers every day at airport, train and bus terminals across America, the Hudson Group is the biggest travel retailer in America. After releasing a list of items most in demand by travelers, it is clear that beverages stand out, accounting for eight of the ten items most frequently purchased, with bottled water taking the top five spots, followed by Diet Coke and Coca-Cola in sixth and seventh spot respectively, M&M Peanuts in eight spot, Coca-Cola Zero in ninth spot, and The Wall Street Journal (the only non-food item on the list) taking up the tenth spot.

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    Here's the breakdown of most frequently purchased items:

    1. Dasani bottled water (20 oz)
    2. Glaceau Smartwater (20 oz)
    3. Large Dasani (one liter)
    4. Glaceau Smartwater (one liter)
    5. Glaceau Smartwater (23.8 oz)
    6. Diet Coke (20 oz)
    7. Coca-Cola (20 oz)
    8. M&M Peanut king-size
    9. Coca-Cola Zero (20 oz)
    10. The Wall Street Journal

    Heightened security and safety limitations that restrict travelers from taking liquids on board flights have no doubt helped increase the demand for these items once travelers have passed through the security gates. But bottled water is expensive, especially at airport terminals where demand is high and competition limited. Besides the expense, plastic bottles take a heavy toll on the environment. Valuable natural resources such as water, energy and petroleum are used in the manufacture and transportation along the production and supply line, and discarded plastic bottles add to the sea of plastic that wreaks havoc on the environment.

    An alternative solution that will not only save you money but will also be better for the environment, is to purchase a lightweight portable refillable water filter bottle that can be topped up anywhere there is a tap on hand. An example of this would be our very own sport berkey. The replaceable carbon filter will remove any potential contaminants that may be lurking in the water, to provide you with healthy purified water, for free. Make sure that the water bottle you purchase is made from non-leachable BPA-free plastic.

    A water filter bottle will not only provide you with a free source of filtered water while waiting in the airport, but as it is reusable, it can come in very useful when traveling to foreign destinations where the quality of drinking water may be questionable. It can also be used to filter freshwater collected from streams, rivers, lakes and even stagnant ponds when traveling to remote locations where there may be no other water supply available. A portable water filter bottle really is a travelers best friend; it is an essential piece of equipment that should be included in every travelers hand-luggage.

  • Clean Air = Clean Water - Clean Air Act credited for improving Chesapeake Bay Water Quality

    The saying, 'what goes up must come down,' certainly holds some weight (no pun intended), but now appears to influence water quality too.

    A recent study shows that cleaner air above the Potomac watershed, including that of the Washington DC metropole may account for the recent improvements in Chesapeake Bay water quality. A team of researchers from the University of Maryland Center for Environmental Science suggest that there is a link between improved water quality of freshwater systems in the Upper Potomac River Basin and improved air quality as a result of the Clean Air Act, which has seen a reduction in nitrogen pollution contaminating land and freshwater systems in the Potomac watershed.

    chesapeake-bay-1310538_960_720

    According to lead author, Keith Eshleman, a professor at the University of Maryland Center for Environmental Science:

    "The recent water quality successes in the Chesapeake Bay restoration are apparently driven more by air quality regulation rather than by water quality control efforts. These air quality regulations were intended to address human health issues and acid sensitive streams. No one thought you would have this positive impact on water quality. It was totally unanticipated."

    Chesapeake Bay is the largest estuary in the US. It is also one of the most polluted, suffering from high nutrient loads and hypoxic conditions due to oxygen depletion resulting from excessive nitrogen inputs. Much focus, and credit, has been given to improved land-based strategies, such as wastewater treatment and agricultural practices, to reduce nitrogen pollution in freshwater systems. Yet the research team found that the improvement in water quality in the Upper Potomac River Basin, covering an area of approximate 12,000 miles that extends across the District of Columbia, Pennsylvania, Virginia, West Virginia and Maryland, can be attributed to improved air quality, or more specifically, due to a reduction in atmospheric nitrogen deposits which have been curbed as a result of the Clean Air Act, introduced in 1973 and amended in 1990.

    "Most best management practices--like a riparian buffer or retention pond--only impact a relatively small area," said Eshleman. "You can think about the Clean Air Act as a best management practice that affects every square meter of the watershed."

    Nitrogen in the atmosphere — largely arising from emissions produced when fossil fuels are burnt — is eventually deposited on land or on surface waters. If the amount of nitrogen that is deposited is higher than the amount of nitrogen that plants and trees need for growth, soils may become nitrogen saturated. This surplus nitrogen can enter freshwater systems, where it can result in algal blooms that negatively impact aquatic life in freshwater and marine ecosystems.

    The scientists have been analyzing water quality data from streams and rivers in the Upper Potomac River Basin since 1986. They have discovered that water quality throughout the watershed has improved universally. In particular, the scientists noted a decline in atmospheric nitrogen deposition since 1996 — the same period that emission limits were placed on coal-fired boilers. The researchers also noted that nitrate concentrations in the Upper Potomac river began to decline soon thereafter, and continued to do so through to 2012. As a result, nitrogen saturation within the watershed was quickly reversed. The study suggests that in the future, water quality within the Potomac watershed is likely to improve further as cleaner energy sources such as renewables and natural gas replace coal-fired energy plants.

    Journal Reference

    Keith N. Eshleman, Robert D. Sabo. Declining nitrate-N yields in the Upper Potomac River Basin: What is really driving progress under the Chesapeake Bay restoration? Atmospheric Environment, 2016; DOI: 10.1016/j.atmosenv.2016.07.004

  • Drinking Water to Control Weight

    When you're feeling peckish and have the urge to snack on junk food, rather have a glass of water instead. Not only will this keep you hydrated, it helps your muscles to work more efficiently, and will also stave away those hunger pangs to help you keep your weight under control.

    In a recent study involving 10,000 adults, ranging in age from 18 to 64, researchers show that drinking lots of water, together with eating fruit and veggies with a high water content, not only keeps our bodies hydrated but can assist with weight control, especially for those of us who are overweight and can afford to lose a few pounds.

    credit: https://www.flickr.com/photos/aquamech-utah/ credit: https://www.flickr.com/photos/aquamech-utah/

    According to Dr Tammy Chang, an assistant professor in the department of family medicine at the University of Michigan Medical School, and lead author of the study: "Staying hydrated is good for you no matter what, and our study suggests it may also be linked to maintaining a healthy weight. Our findings suggest that hydration may deserve more attention when thinking about addressing obesity on a population level."

    Dehydration can affect our physical, emotional and mental well being, causing headaches, kidney problems and constipation, as well as negatively impacting our moods, memory and ability to pay attention.

    But, according to Chang, the amount of water consumed is not necessarily a clear indicator of hydration, as the amount of water needed to keep hydrated varies from person to person and is affected by factors such as body size, activity levels and the climate where we live and work.
    "Imagine if you were a landscaper in Arizona versus a receptionist in Michigan," explains Chang. "The amount of water it takes to stay hydrated will be drastically different."

    For this study, the researchers looked at hydration from a new angle — it's not so much the volume of water that you drink, but how hydrated your body becomes after doing so. In order to assess that, they analyzed urine samples of study participants to measure water concentrations.

    When we are hydrated our heart is able to pump blood to our muscles more efficiently, which in turn enables them to work more efficiently. The research team found that keeping hydrated was particularly important for those of us with a body mass index (BMI) score higher than 25, which is considered overweight. According to the US Department of Health & Human Services, two thirds of the American population fall on this end of the BMI scale, which in effect means that many of us could benefit from being better hydrated.

    "We found hydration and BMI/obesity are associated. A bigger person needs more water than a smaller person to stay hydrated," said Chang. "It could be that those people with higher BMI are more likely to be inadequately hydrated or that those that stay well hydrated are less likely to be obese."

    In another study, researchers tested how drinking water before a meal affects the stomach and brain to influence feelings of satiety. They found that participants who drank more water felt less hungry before eating the meal, and fuller afterwards.

    Drinking water has obvious health benefits, and it appears that it can help with weight control too. However, bear in mind that water can also contain contaminants that can be harmful to our health. The best option is to drink lots of purified water. For optimal health, invest in a good quality drinking water filter that can remove a wide range of harmful water pollutants to provide you with a source of pure healthy drinking water to keep your body hydrated.

    Journal Reference

    Chang et al. Inadequate Hydration, BMI, and Obesity Among US Adults: NHANES 2009–2012. Ann Fam Med July/August 2016 vol. 14 no. 4 320-324. doi: 10.1370/afm.1951

  • Water-efficient Crop Production

    The problem of how to boost food production is an important issue for humanity, considering our limited water resources and the ever-growing global population. Water usage at its current level is already unsustainable, with around 70% of global water usage being used for agriculture.

    Water extraction for crop growth not only lowers the groundwater table, exacerbating water scarcity, it also significantly adds to the volume of water moving from land to sea — estimated to be around 50 net cubic miles.  This is equivalent to three times the volume of water that cascades down the Niagara Falls every year — making a 30% contribution to sea level rise. According to the Global Agriculture Report, water demand for irrigation has increased three-fold over the last 50 years, and is expected to rise by another 20% by 2050.

    crops

    Approximately 80% of water that is released into the atmosphere from terrestrial sources does so via transpiration in plants, who take up the water from soils via their roots and then release it via their leaves during the process of photosynthesis. Considering that so much water is lost via plant leaves during production, it is the greatest factor limiting the expansion of crop production globally. Consequently, if we wish to reduce the amount of water used in agriculture while still maintaining food security in the years ahead, it is essential that we find crop plants that utilize water more efficiently.

    Now researchers from the Technical University of Munich (TUM) have done just that. By identifying and permanently activating the natural water-conservation mechanism used by plants when water is scarce, which allows them to absorb carbon dioxide with limited water loss, the scientists have managed to get the plants to make more efficient use of water without negatively affecting their growth.

    Gaseous Exchange in Plants

    Plants regulate the flow of carbon dioxide and water vapor through the stomata — tiny pores found on the surface of plant leaves. When these pores close, water loss is reduced; however, it also limits the absorption of carbon dioxide. When the stomata are open to allow carbon dioxide to enter, they can lose between 500-1000 molecules of water, depending on the humidity and air temperature. However, during dry periods when water is not so readily available plants are able to reduce internal carbon dioxide concentrations in order to absorb carbon dioxide more effectively.

    "Plants have the ability to cut water loss during CO2 absorption in half, but they will only switch to this water-saving mode when water is in short supply," says Erwin Grill, Professor of Botany at TUM. "With arable crops, plants with a perpetually activated water-saving strategy would preserve the moisture in the ground to use it for growth and survival at a later point in times of drought."

    Water-saving Mode Activated by Plant Hormone

    The researchers have discovered that this water-saving mode is activated by the plant hormone known as abscisic acid, which plants produce at higher quantities when water is scarce. Tests conducted on mouse-ear cress (Arabidopsis), which has fourteen receptors dedicated to detecting this hormone signal, show that when production of these receptors is increased, plants will switch to water-saving mode, regardless of whether water is scarce or not. However, of these fourteen receptors, only three did not have a negative effect on plant growth, but a 40% water saving is feasible without negatively impacting the plant's overall performance.
    While initial laboratory experiments conducted in a phytochamber simulating field conditions show positive results, the next step would be to determine whether the same water-saving effects can be achieved in the field.

    "It remains to be seen if crop plants such as wheat, corn, and rice can produce more biomass with the same amount of water using this mechanism," says Professor Grill. "We are optimistic"

    Since the mechanisms involved are present in all plants, it should be possible to transfer these results from the model plant Arabidopsis to crop plants. This would be an important step towards ensuring future food security.

    Journal Reference

    Zhenyu Yang, Jinghui Liu, Stefanie V. Tischer, Alexander Christmann, Wilhelm Windisch, Hans Schnyder, and Erwin Grill: Leveraging abscisic acid receptors for efficient water use in Arabidopsis, PNAS 2016. DOI: 10.1073/pnas.1601954113
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    https://commons.wikimedia.org/wiki/File:Irrigating_fields_SW_of_Killerton_Estate_(NT)_-_geograph.org.uk_-_35012.jpg

  • Drinking Water of 6 Million US Citizens Contaminated with Toxic Chemicals

    Unsafe levels of toxic chemicals widely used in industry have been found in drinking water supplies serving six million Americans.

    A recent study conducted by Harvard scientists, published in the scientific journal Environmental Science & Technology Letters, has revealed that fluorinated compounds — perfluoroalkyl and polyfluoroalkyl (PFASs) — industrial chemicals that pose a health risk, including an increased risk of cancer, occur at elevated levels in public drinking water systems across the country.

    "For many years, chemicals with unknown toxicities, such as PFASs, were allowed to be used and released to the environment, and we now have to face the severe consequences," said lead author Xindi Hu, a doctoral student in the Department of Environmental Health at Harvard Chan School and Environmental Science and Engineering at SEAS. "In addition, the actual number of people exposed may be even higher than our study found, because government data for levels of these compounds in drinking water is lacking for almost a third of the U.S. population--about 100 million people."

    PFAS compounds have been widely used in both commercial and industrial products, including fire-fighting foam and everyday products such as clothing, food wrappers and pots and pans. Some of the health risks associated with PFASs include hormone disruption, obesity, high cholesterol and cancer. Yet while some manufacturers have opted to discontinue their use due to the safety risks they pose, these carcinogenic chemicals are still found in wildlife and people, with drinking water being a key source of exposure.

    Firefighting_foam_at_Dover_AFB,_Del._130916-F-VV898-076

    For the study, the research team analyzed water quality data collected by the EPA between 2013 to 2015 for public water supplies across the country to determine the concentrations of PFASs — in total, over 36,000 water samples were assessed. They also examined industrial sites where PFASs are manufactured; sites where fire-fighting training is conducted or where fire extinguishing foam is routinely used, such as military training sites and airports; as well as wastewater treatment facilities where discharged water could potentially contaminate groundwater, as standard wastewater treatment methods are not able to remove PFASs during the treatment process. Wastewater sludge used on crops as fertilizer could also present another source of groundwater contamination by PFASs.

    The study revealed that in 194 of the 4,864 water supplies tested, PFAS toxins occurred at concentrations equal to or greater than the EPA's minimum reporting level requirements, with drinking water supplies from 13 states representing 75% of the observations, including drinking water from the following states (listed in order of frequency of occurence): California, New Jersey, North Carolina, Alabama, Florida, Pennsylvania, Ohio, New York, Georgia, Minnesota, Arizona, Massachusetts, and Illinois.

    According to the study, 66 of the public water supply systems examined, providing drinking water to six million Americans, contained at least one water sample that exhibited PFASs at levels equal to or higher than the EPA safety standard of 70 parts per trillion (ng/L) for two types of PFASs, perfluorooctanoic acid and perfluorooctanesulfonic acid, with concentrations as high as 349 ng/L for the former being observed in Warminster, PA, and 1,800 ng/L for the latter being observed in Newark, DE.

    Watersheds situated close to wastewater treatment facilities, military bases, and industrial sites — all sites where these compounds are typically found — had the highest concentrations of PFASs.

    According to co-author, Elsie Sunderland, an associate professor at Harvard, these chemicals are 'potent immunotoxicants in children' with recent studies suggesting that their safety standards for drinking water should be at levels much lower than those currently set by the EPA.

    Health Implications of Exposure to PFASs

    In another Harvard study led by Philippe Grandjean, a co-author of this paper, the health implications of exposure to PFASs are discussed. The study, which was recently published in Environmental Health Perspectives, suggests that exposure to PFASs in early childhood can impair immune functioning and reduce the efficacy of vaccinating children against diseases such as tetanus and diphtheria.

    PFAS's fall under the category of PFC's - Perfluorinated Chemicals. PFOA, PFOS, etc.  The Black Berkey elements that come standard with our Berkey systems do reduce these contaminates, to an Extreme Degree (in parts per trillion). Testing to back this up does exist and will be released soon.

    Journal References

    Xindi C. Hu, David Q. Andrews, Andrew B. Lindstrom, Thomas A. Bruton, Laurel A. Schaider, Philippe Grandjean, Rainer Lohmann, Courtney C. Carignan, Arlene Blum, Simona A. Balan, Christopher P. Higgins, and Elsie M. Sunderland. Detection of Poly- and Perfluoroalkyl Substances (PFASs) in U.S. Drinking Water Linked to Industrial Sites, Military Fire Training Areas, and Wastewater Treatment Plants. Environmental Science & Technology Letters, online August 9, 2016, doi: 10.1021/acs.estlett.6b00260

    Philippe Grandjean, Carsten Heilmann, Pal Weihe, Flemming Nielsen, Ulla B. Mogensen, and Esben Budtz-Jørgensen. Serum Vaccine Antibody Concentrations in Adolescents Exposed to Perfluorinated Compounds. Environmental Health Perspectives, online August 9, 2016, doi: 10.1289/EHP275

  • Using Sound to Echolocate Underground Water Leaks

    Researchers from Concordia University have developed a method of locating underground in distribution networks with a 99.5% accuracy.

    Water scarcity is a worldwide problem that will challenge 33% of the global population by 2025. This water crisis can be averted if one of the main culprits — leaks — can be addressed. It is estimated that between 20-30% of water leaving water treatment plants is lost as a result of water leakage, which can be resolved if the problem is addressed and fixed.

    water-pipe-880975_960_720 (1)

    But first we have to find the leaks, which can be difficult to detect when pipes are buried underground. When repair work is undertaken, this needs to be done as precisely as possible, to not only limit the cost involved with excavation work and resurfacing, but also to limit disruptions to traffic, commuter frustration, and loss of income due to disruptions to local trade and industry.

    Furthermore, leaking pipes not only waste valuable water; damaged water pipes allow pollutants to enter the water flowing through them via the holes in the pipelines, posing a drinking water hazard and health risk to consumers.

    Thankfully, scientists from Concordia University, Montreal, have developed an innovative tool — known as a noise logger — to address this problem. They recently conducted a study to test the effectiveness of the tool, traveling to Doha in the water scarce nation of Qatar to apply the noise logger in detecting water leaks within Qatar University's water network.
    Qatar not only has one of the lowest rainfall rates globally, but also among the highest evaporation rates globally. Consequently, when rain does fall it quickly evaporates back into the atmosphere in the form of water vapor.

    According to co-author, Tarek Zayed, a professor in the Department of Building, Civil and Environmental Engineering at Concordia University: "Qatar is currently facing significant challenges regarding its water supply. Its water distribution network currently suffers from 30-35% water loss due to leakage."

    The results of the study, which where recently published in the Journal of Infrustructure, show that the noise logger is not only effective at detecting leaks, but can do so with fine accuracy before any major earthworks are required.

    "This approach can reduce the duration of a leak, as well as the cost and time involved in locating the site in need of repair." " explains Zayed

    To test their theory, the researchers installed noise loggers on Qatar University's water mains network to record sounds generated by water leaks over a 2-hour period. They then scrutinized the sound readings, comparing noise level and spread. The researchers deemed a leak investigation necessary when a consistent sound anomaly was detected.

    After monitoring Qatar University's water mains for several weeks they collected sound readings from 140 points across the water network. They then used mathematical model simulations to pin-point the exact location of where water leaks were occurring. After investigating the locations of the leaks, Qatar University's facilities management reported that the researchers had detected the leaks with 99.5% accuracy.

    The researchers now plan to conduct surveys of leak data from real-life municipal water networks where noise loggers are used in an effort to develop tailor-made leak location prediction models.

    Journal Reference
    El-Abbasy, M., Mosleh, F., Senouci, A., Zayed, T., and Al-Derham, H. (2016). "Locating Leaks in Water Mains Using Noise Loggers." J. Infrastruct. Syst. , 10.1061/(ASCE)IS.1943-555X.0000305 , 04016012.

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