Abstract
This research was conducted using jar tests to investigate the impact of adding activated sludge solids to the Actiflo process, a high-rate clarification (HRC) system, to increase BOD removal in HRC systems treating raw wastewater during periods of high wet-weather flows (WWF). A study of dosages and impacts of ferric sulfate, polymer, microsand and activated sludge on performance of the Actiflo process was investigated. Experiments were designed to determine the dosages of activated sludge and other chemicals necessary to achieve an effluent BOD5 level of 30mg/L in this physical-chemical process with an influent BOD5 concentration of 100 mg/L. With a 490 mg/L dose of activated sludge and 15 minutes mixing time, the effluent BOD removal efficiency was enhanced by approximately 30% using lower chemical dosages in jar tests.
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