Zimba automatic chlorine dispenser
Suprio Das, Massachusetts Institute of Technology
Zimba is a point-of-use water chlorinator that aims to reduce water-borne diseases. Zimba dispenses a preset dose of liquid chlorine (sodium hypochlorite) into a batch of water within a storage tank. The storage tank allows this water to be exposed to chlorine for about 30 minutes, WHO’s recommended contact time, to allow disinfection before use. Zimba strives for a simple design, with no moving parts.
South East Asia
Massachusetts Institute of Technology (MIT) in collaboration with The International Centre for Diarrhoeal Disease Research, Bangladesh
$ 150.00 USD
LOTUS Water from Stanford
Rural communities in South Asia with an existing water source, such as the hand pump or a well.
Individually produced. Interview with representative
Patent-Pending. Interview with representative
Zimba devices are distributed through direct sales to water organizations, such as NGOs. Interview with representative
5+ devices have been implemented during testing; 13 devices have been sold. Interview with representative
Weight: 12 kg The outer shell is made of food grade fibreglass and the inner parts are made of virgin polypropylene plastic.
The Zimba device automatically mixes chlorine into water in the correct proportion, regardless of the flow rate of the water. The Zimba device can be fitted to a rural community’s existing water source, such as the hand pump of a well, the tap of a rainwater harvesting cistern, or the faucet of a piped water system. The device is gravity powered. Device installation takes under 30 minutes, chlorine refilling takes under 10 minutes. Interview with representative The following video provides operational overview: Introducing ZIMBA
A step-by-step Operations & Maintenance Guide is provided along with all accessories for users and implementing NGOs. Interview with representative
Manufacturer claims that no parts are expected to require replacement; It is possible for the faucet to break at the output. This faucet is available locally. Interview with representative
Automatically mixes chlorine into water in the correct proportions, regardless of the flow rate of the water. Can be fitted to a rural community’s existing water source. Does not require electricity, has no moving parts that can fail, uses only gravity to operate, can handle thousands of liters per day, no expensive cartridges to replace, water can be input in any way [Zimba](http://www.zimbawater.com/technology-2/)
Findings from this Article: “Water samples collected directly from the ZIMBA devices were between 0.2-2ppm (a “safe” chlorine residual) 91% of the time (8% were slightly above 2ppm), whereas only 13% of raw handpump water samples among treatment compounds and 39% of handpump samples among control compounds had a safe chlorine residual. A total of 81% of stored drinking water samples had a safe chlorine residual among treatment HHs, compared to 29% of stored water samples in control compounds (p<0.001). Free chlorine levels in stored water were significantly higher in treatment HHs compared to control (mean difference=0.33ppm, p<0.001)….The concentration of E. coli in stored water was lower in treatment HHs compared to control HHs (mean difference=0.4cfu/100ml, p=0.004).”
International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka, Bangladesh
Massachusetts Institute of Technology.
Global Disease Detection Branch,Division of Global Health Protection, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Sodium hypochlorite is highly reactive and volatile. Users are advised to never store the solution in any metallic container as chlorine will react with the metal. Sodium hypochlorite should always be stored or transported in opaque plastic containers to prevent exposure of the solution to UV radiation from sunlight, which will decrease its shelf life. In case the available chlorine solution is of a higher concentration than what is needed in the Zimba unit, users are responsible for diluting it appropriately with water.
Using a pre-filter could improve water quality and reduce the amount of chlorine needed, depending on specific contamination of water source.
“Piloting an automated batch chlorination system at shared water points in an urban community of Dhaka” Amin et al.
“Differences in Field Effectiveness and Adoption between a Novel Automated Chlorination System and Household Manual Chlorination of Drinking Water in Dhaka, Bangladesh: A Randomized Controlled Trial.” Pickering et al.
•NSF / ANSI Standard 60: Drinking Water Treatment Chemicals: Zimba is not specifically listed as complying, but dozens other companies selling sodium hypochlorite products for drinking water treatment are approved. This certifies that chemicals are safe at the maximum dose and that any impurities are below the maximum allowable limit.
• US Environmental Protection Agency (EPA) Registration: Zimba is not registered with the EPA, sodium hypochlorite has been registered since 1957, and the EPA issued a registration standard in 1986 saying that sodium hypochlorite products (with 5.25% – 12.5% chlorine) do not need individual registration review. The document also states that, “widely used in disinfecting water supplies for nearly a century, the hypochlorites have been proven safe and practical to use”.
• World Health Organization (WHO):The World Health Organization does not currently approve products for use to treat drinking water. However, the Guidelines for Drinking Water Quality list liquid NaOCl with concentrations between 0.5% and 1% as a point-of-use water treatment method commonly used to prevent diarrhea in developing countries and for travelers. WHO Guidelinesfor drinking water quality
Zimba WHO evaluated the system outputs according to recommendations for chlorine dosing and contact times.
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