Background: Reusing waste water by appropriate treatment is an effective method
for substantiating the ever increasing water demand for construction, irrigation, domestic
and industrial purposes. The greywater is the domestic waste water that does not contain the
toilet effluent and it is converted and used for non-potable purpose through coagulation and
flocculation by using natural coagulant.
Objective: The main objective of this work is to evaluate the coagulating efficiencies of various
natural coagulants on synthetic greywater by varying pH, mixing speed, mixing time
and coagulant dosage.
Methods: Powdered coagulants obtained from tamarind seeds, moringa oleifera, banana
peels and fly ash were compared with conventional commercial coagulants like alum for
synthetic and real greywater.
Results: The natural coagulants have shown significant performance compared to chemicals
Conclusion: The turbidity removal efficiency for tamarind seeds, moringa oleifera, banana
peels and fly ash were found to be 61.33%, 85.75%, 90.42%, 94.27% against 96.49% obtained
from alum on treating with synthetic grey water under identical conditions.