Abstract
Modified bench scale jar tests were conducted to evaluate a treatment strategy for combined sewer overflow (CSO) generated during wet-weather conditions in Windsor, Ontario, Canada. Alum and an anionic polymer (Polymer A-3330) were used as a primary coagulant and coagulant aid, respectively. Commercially available silica sand was employed as the micro carrier. Under the operating conditions optimized in the study, alum dose of 9.7 – 17.8 mg l-1 as Al3+ and polymer dosage of 1.0 – 1.8 mg l-1 were observed to be the most effective in solids removal. Addition of the micro carrier (MC) up to 3 g l-1 significantly increased the settleability of suspended solids, and about a five-fold increase in settleability was observed with 3 g l-1 MC. In the size range of < 300 μm and at 3 g l-1 concentration, the effect of MC size on the performance of the process was observed to be insignificant. Using the developed process, suspended solids and BOD removal efficiencies of > 98% and > 60%, respectively, were obtained with wet-weather flow after 8 minutes of settling, under both low and high suspended solids conditions.
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