Elimination of Suspended Solids from Aerated Lagoon Effluent by Horizontal Roughing Filter

Elimination of Suspended Solids from Aerated Lagoon Effluent by Horizontal Roughing Filter

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Background and Objectives: Horizontal roughing filters (HRF) can properly remove suspended solids and microorganisms from surface water resources, especially on filtration rates less than 1.5 m/h.This research was aimed at suspended solid removal efficiency of HRF during secondary wastewater effluent filtration.Methods: This experimental study was conducted by installing Garden Arches an HRF pilot system on effluent pumping station of Qom wastewater treatment plant based on aerated lagoon process.The pilot was a horizontal cylindrical column consisting of three compartments filled with river gravels in various sizes.

Grab samples were simultaneously taken from HRF inlet and outlet in three filtration rates: 0.5, 1, and 1.5m/h Results: The Heritage Banners results indicated that filtration rate had a significant effect on the amount of total suspended solids in HRF effluent.During optimum operation of HRF, removal efficiencies of three filtration rates (0.5, 1, and 1.

5 m/h) were 78.5, 63.1, and 66.9, respectively.Conclusion: T-test analysis indicated that with a significance difference, outlet effluent from HRF in all three flow rates met the standard requirements of Iran Environmental Protection Agency for irrigation and discharge to surface water.