Inderscience Publishers

Performance of horizontal flow roughing filter using limestone media for the removal of turbidity, suspended solids, biochemical oxygen demand and coliform organisms from wastewater

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This paper examines and evaluates the removals of turbidity, suspended solids, BOD and coliform organisms from wastewater using different sizes of limestone roughing filter. Results indicated that removal efficiencies depended on the size of the filter medium and applied flow rates. Turbidity, suspended solids, BOD and coliform organisms removals were between 75% and 92%, 79% and 88%, 51% and 67% and 67% and 96%, respectively, in a combination of the three filter media with particle sizes between 1.91 mm and 16.28 mm. Removal efficiency was found to increase with slower flow rates.

Keywords: limestone, roughing filter, turbidity, suspended solids, coliform organisms, horizontal flow, wastewater treatment, biochemical oxygen demand, BOD

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