Laboratory Califier Test to Predict and Optimize Full Scale Chemically Enhanced Primary Treatment (CEPT) Process

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INTRODUCTION
The overall objective of this research was to develop a laboratory clarifier test to predict fullscale primary clarifier performance. This test was developed by simulating surface overflow rate (SOR) and flocculation time, which are the limiting parameters for primary clarification. This study describes the development of a procedure to predict full-scale NSS (Non-Settleable Solids) and effluent TSS (Total Suspended Solids) from a primary clarifier using CEPT (Chemically Enhanced Primary Treatment).

MATERIALS AND METHODS
This study was conducted at the Blue Plains Advanced Wastewater Treatment Plant (AWTP) in Washington, DC. The method used for this test was adapted from an SOR procedure used for sizing Lamella Separators (Larsson, 1986), with several modifications.To decrease wall effects and increase the length of settling time, a larger 4000 ml graduated cylinder was used to reduce artifacts and errors during testing. Flocculation (and rapid mixing if desired) was included in the test by simulating full-scale flocculation time. Full-scale SOR was predicted by varying the sampling time in the graduated cylinder. Generalized formulae for determining flocculation time and SOR are given below.

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