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CLARIFICATION CONCEPTS FOR TREATING PEAK WET WEATHER WASTEWATER FLOWS

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Clarification can be an effective process for treating wet weather flows. The effectiveness of clarification in removing pollutants will depend on the characteristics of the suspended solids in wet weather. Suspended solids in wet weather flows can be significantly different from the suspended solids in dry weather flows. Hence determination of organic content, particle size distributions, and most importantly settling velocities in actual wet weather flows will allow for a more accurate determination of the performance potential and costs for clarification as compared to other competing wet weather control strategies. Chemical coagulation increases the fraction of solids that can be removed by clarification, and is a key component in wet weather clarification. Several types of wet weather clarification techniques are presented and discussed including chemically enhanced primary treatment, plate clarifiers, high-rate clarification, aeration tank settling, and hydrodynamic vortex separators.
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Document Type: Research Article

Publication date: 2005-01-01

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