Background: Solutions to challenges of access to potable water have been the
focus of many studies around the world, which also is one of the goals of sustainable development.
Objective: This study attempts to address this issue wherein we tested the efficiency of
blended coagulants in removing pollutants from surface water. Previous studies have reported
and suggested the requirement of blended coagulants that are tailor-made for treating
geographically specific water samples since single coagulants will not be effective in
removing all pollutants.
Methods: Three coagulants, two natural and one chemical, were blended for the present
study in various ratios. Turbidity removal of the bi and tri-blend coagulants of water samples
with initial turbidity of 70 and 150NTU was above 95% - 100%.
Results: Removal of Physico-chemical parameters by blended coagulants in surface waters
was up to 48% for electrical conductivity, 80% for total solids, 36% for hardness,
40% for alkalinity and 57% for chlorides. The results are supported with analysis from
SEM images showing adsorbed floc on to coagulant and FTIR spectra presenting the
functional groups responsible for coagulation.
Conclusion: Hence, it can be concluded that the natural coagulants tested in the present
study are promising solutions for the challenges of water quality.