Natural coagulants in water clarification

Powdered seed suspensions of the Moringa oleifera tree have proved effective as a primary coagulant to clarify a stable kao­linite suspension. Acting as a cationic polyelectrolyte optimum minimum dosage to achieve maximum turbidity removal have been determined over a range of initial turbidity value...

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Bibliographic Details
Main Authors: Geoff K. Folkard, John P. Sutherland, W.D. Grant
Format: Default Conference proceeding
Published: 1987
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Online Access:https://hdl.handle.net/2134/30433
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Summary:Powdered seed suspensions of the Moringa oleifera tree have proved effective as a primary coagulant to clarify a stable kao­linite suspension. Acting as a cationic polyelectrolyte optimum minimum dosage to achieve maximum turbidity removal have been determined over a range of initial turbidity values (50-550NTU). The weight ratio of seed dosage to clay concentration appears in­dependent of initial clay concentration. A field usable dissolved air flotation system has been developed. This technique, when applied to a kaolinite/bentonite model sus­pension, produced clear water in minutes as opposed to hours for conventional sedimenta­tion. Topics for further investigation are outlined.