(natural coagulant). Alum resulted in a 128.1 SVI, while the lateritic
soil SVI was approximately 2.4. The ratio for the volume of sludge
produced in the case of the alum and lateritic soil coagulants was
53:1. Furthermore, the lateritic soil produced a relatively compact
sludge as compared to the alum because lateritic soil is an organic
product that is environmentally friendly.