Abstract
AbstractFloc blankets are concentrated, fluidized beds of particles utilized in some water treatment plants. Floc blankets occur in vertical-upflow sedimentation tank configurations and are reported to enhance removal of suspended solids. In this research, floc blankets were formed in the laboratory at an upflow velocity of 1.2 mm/s and at varying alum coagulant dosages with influent turbidities of 10 nephelometric turbidity units (NTU), 100 NTU, and 500 NTU. Image analysis was utilized to quantify floc blanket suspended solids concentration and floc-water interface height over time. Blankets formed with higher influent turbidities required a lower ratio of coagulant dose to influent turbidity, formed more quickly, had higher steady-state suspended solids concentrations, and achieved better suspended solids removal efficiency. Increasing alum coagulant dose decreased steady-state floc blanket suspended solids concentration and resulted in lower effluent turbidities. At an influent turbidity of 100 NTU, e...
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