Seeds of the plant species Strychnos potatorum and Moringa oleifera contain natural polyelectrolytes which can be used as coagulants to clarify turbid waters. In laboratory tests, direct filtration of a turbid surface water (turbidity 15–25 NTU, heterotrophic bacteria 280–500 cfu ml−1, and fecal coliforms 280–500 MPN 100 ml−1), with seeds of S. potatorum or M. oleifera as coagulant, produced a substantial improvement in its aesthetic and microbiological quality (turbidity 0.3–1.5 NTU, heterotrophic bacteria 5–20 cfu ml−1, and fecal coliforms 5–10 MPN 100 ml−1). The method appears suitable for home water treatment in rural areas of developing countries. These natural coagulants produce a ‘low risk’ water; however, additional disinfection or boiling should be practised during localised outbreaks/epidemics of enteric infections.
Research Article|March 01 2005
Home water treatment by direct filtration with natural coagulant
J Water Health (2005) 3 (1): 27-30.
Raveendra Babu, Malay Chaudhuri; Home water treatment by direct filtration with natural coagulant. J Water Health 1 March 2005; 3 (1): 27–30. doi: https://doi.org/10.2166/wh.2005.0003
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