Natural coagulants in water clarification
conference contributionposted on 2018-02-12, 15:09 authored by Geoff K. Folkard, John P. Sutherland, W.D. Grant
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.
This paper reports on the initial findings of a three year research programme funded by the Overseas Development Administration.
- Architecture, Building and Civil Engineering
- Water, Engineering and Development Centre (WEDC)