Project Well has developed a pilot self-supporting community-based mitigation program to provide arsenic-safe water to the villagers of North 24 Parganas, West Bengal, India. Shallow concrete dugwells, less than 25 feet deep, that tap into an unconfined aquifer are constructed following stipulated guidelines. The design differs from the traditional dugwell in two major ways: (i) there is a layer of coarse sand in the annular space enveloping the outer wall of the concrete cylinder; and (ii) handpumps are used for water extraction to reduce the potential for bacterial contamination. Monitoring programs for arsenic and coliform bacteria in selected dugwells have been completed. In summer, when the water levels were low, the arsenic concentrations were measured. In 11 wells, measured over three years, the average water arsenic concentration was 29 micro gL-1. Two dugwells had high concentrations of arsenic (average 152 micro gL-1 and 61 micro gL-1), but the remaining nine dugwells had an overall average of 11 micro gL-1. Seasonal variation was assessed in five wells with monthly measurements and there was a direct relationship between increases in arsenic concentrations and decreases in the volume of water in the dugwells in the dry summer season. To control bacterial contamination, sodium hypochlorite solution containing 5% chlorine was applied once a month. In 2005, fecal coliform was undetected in 65% (n = 13) of the dugwells but detected at high levels in 35% (n = 7) of the dugwells. The program clearly reduced exposure to arsenic, but we conclude that further study of increases in arsenic concentrations in the dry season are warranted, as well as assessment of ways to more effectively control bacterial contamination such as more frequent chlorination, perhaps with lower doses on each occasion.
In 1982, Dr. K. C. Saha, a dermatologist of Calcutta, West Bengal, identified patients with skin lesions from the district of 24 Parganas, leading him and others to search for a cause. The cause was soon identified to be arsenic in drinking water, but even today, 20 years later, large number of people continue to drink arsenic contaminated water and patients are increasing in number. Project Well is a program chosen for implementation in some villages of North 24 Parganas. Arsenic safe drinking water is provided for adopted villages by constructing shallow, concrete dugwells designed to tap the water of the unconfined aquifer, 20-30 feet below ground level, that contains low levels (<0.05 mg/L) of arsenic in the target region. The traditional dugwell design is modified by use of tube well hand pumps to withdraw water. The project includes community involvement, *Correspondence: Meera M. Hira Smith, School of Public Health, University of California, Berkeley, California, USA. E-mail: mmhsmith@uclink.berkeley.edu. MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK, NY 10016programs to increase awareness of the need to drink arsenic safe water, and training in monitoring of dugwell water for arsenic and harmful pathogens. Disinfecting of the water and regulating the water hazard diagram are also included in the training program. The plan is to make the system sustainable at the village level using indigenous labor and materials.
With more than 150 million people in India, Bangladesh and Nepal exposed to arsenic through drinking water, arsenic mitigation projects are common in the region, including many failed and abandoned projects. Our nonprofit organization, Project Well, has been working since 2001 to provide cheap, easily adaptable safe-water solutions suitable for the local socioeconomic environment. After years of research and experimentation, Project Well has developed a ‘bi-tech’ well that fulfills these criteria by tapping arsenic-safe surface water from unconfined aquifers. From 2001 to 2009, Project Well constructed dugwells modified from local traditional dugwells; one important modification was that water was extracted using hand pumps rather than rope-and-bucket, to minimize bacterial contamination. A sizeable percentage of these dugwells were dry during the summer seasons, so in 2009 we began constructing ‘bi-tech’ wells that combined the features of our bacterial-growth-preventing dugwells with the depth of borewells (8 meters). In the summer of 2014, 94% of bi-tech wells contained water compared to 53% of our modified dugwells. Fecal coliform and E. coli were undetected in tests conducted in 2011 and 2014. In 2015, arsenic concentrations were <10 ppb in 95% of the wells. Bi-tech well maintenance is simple, with dredging rarely necessary, and easy for communities to learn. With its low construction costs, easy maintenance, and consistent safe-water output, bi-tech wells are proving an effective water solution in parts of rural India where piped water is not available.
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