MUNICIPAL WASTEWATER TREATMENT BY COAGULATION/ FLOCCULATION PROCESSES VIA OPTIMIZATION OF INOCULATION DOSE AND SETTLING TIME
Shafiullah1*, Mohammad Nafees2
ABSTRACT
This study was conducted on municipal wastewater with an attempt to identify proper treatment measures. The
drain under study was observed for three months. In total 45 samples were collected from five different sites at the
rate of three samples per day (Morning, Afternoon and Evening). Each sample was a composite of three grab samples
collected with four hours intervals. All Samples were analyzed for physico-chemical characteristics. On comparison
with Pak NEQS it was observed that the municipal wastewater physicochemical quality was above the permissible
limits. A series of coagulation/flocculation treatments were given by applying different doses of ferric chloride in
combination of calcium hydroxide. Effective removals of pollutants were obtained by using ferric chloride and calcium
hydroxide in ratio of 2:0.5 mL for settling time of 13 minutes. As treatment results, not only removed suspended
solids (86%) but a tremendous decrease was observed in color, chemical oxygen demand (COD) and turbidity by
96%, 66% and 89%, respectively.
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