Point-of-use water treatment with chlorine is underutilized in low-income households. The Zimba, an automated batch chlorinator, requires no electricity or moving parts, and can be installed at shared water points with intermittent flow. We conducted a small-scale trial to assess the acceptability and quality of Zimba-treated municipal water. Fieldworkers collected stored drinking water over a 10-week period from control (n = 24 households) and treatment (n = 30 households) compounds to assess levels of free chlorine and E. coli contamination. Overall, 80% of stored drinking water samples had a safe chlorine residual among treatment households, compared to 29% among control households (P < 0.001). Concentrations of E. coli were lower (mean difference = 0.4 log colony-forming units/100 mL, P = 0.004) in treatment compared to control households. Fifty-three percent of mothers (n = 17), thought the Zimba was easy to use and 76% were satisfied with the taste. The majority of mothers mentioned that collecting water from the Zimba took more time and created a long queue at the handpump. The Zimba successfully chlorinated household stored drinking water; however, further technology development is required to address user preferences. The Zimba may be a good option for point-of-collection water treatment in areas where queuing for water is uncommon.
Field trial of an automated batch chlorinator system at shared water points in an urban community of Dhaka, Bangladesh
Nuhu Amin, Yoshika S. Crider, Leanne Unicomb, Kishor K. Das, Partha Sarathi Gope, Zahid Hayat Mahmud, M. Sirajul Islam, Jennifer Davis, Stephen P. Luby, Amy J. Pickering; Field trial of an automated batch chlorinator system at shared water points in an urban community of Dhaka, Bangladesh. Journal of Water, Sanitation and Hygiene for Development 1 March 2016; 6 (1): 32–41. doi: https://doi.org/10.2166/washdev.2016.027
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