| Summary: | This study evaluated the efficiency of deshelled papaya seeds as the natural coagulant in improving quality of river
water. The deshelled papaya seeds biomass was mainly characterized for functional groups using FTIR, surface charge
and protein content. Coagulation and flocculation tests were conducted using batch test for various dosages and pH
values. The optimum dosage and pH were then tested in treating river of Class III to Class V. The functional groups in
deshelled papaya seeds were O-H, C=O and C-O groups. The surface charge and protein content was +0.4 meq/g and
363 mg/g, respectively. The deshelled papaya seeds coagulant was able to remove turbidity up to 87.6 and 88.3% for
river of Class III and Class IV, respectively, as well as 57.6 and 62.1% of total coliform and Escherichia coli, respectively,
from Class III river at dosage 196 mg/L and pH 4. This study demonstrated that the deshelled Carica papaya seedsderived
coagulant is capable in treating common pollutants of river and simultaneously shows antibacterial properties.
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