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WERF/CRTC Testing Indicates That No New Clarifier Basins Are Needed To Double Plant's Capacity

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Testing was conducted on the activated sludge secondary clarifiers at the Northwest Water Reclamation Facility in accordance with industry standard protocols for dispersed suspended solids, flocculated suspended solids and mixed liquor settling. The results of the mixed liquor settling tests were used in a series of state point analyses to evaluate overflow and underflow capacities. These results were then used to evaluate alternatives for two phases of plant upgrades. The first phase would increase the average daily flow capacity from 28 ML/d (7.5 mgd) to 43 ML/d (11.25 mgd), while the second phase would further increase capacity to 57 ML/d (15 mgd). Upgrades to the clarifier internals were recommended, but the study results indicated that the planned upgrades could be accommodated without building any new clarifier basins.

Keywords: dispersed suspended solids; flocculated suspended solids; peripheral density current baffle; secondary clarifier; solids settling flux curve; state point analysis

Document Type: Research Article


Publication date: January 1, 2009

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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