ABSTRACT
This chapter investigates effectiveness of a Krofta Sandfloat Sedifloat clarifier on treating the secondary effluent at the Norwalk Wastewater Treatment Plant, Ohio. The newly developed two-stage system involves the use of a Sandfloat Sedifloat clarifier in the second stage for upgrading of an existing biological system which is now considered as the first stage treatment. In summation, wastewater treatment by a biological-physicochemical process system has been demonstrated to be both technically and economically feasible. Wastewater from the mill is cooled via heat exchanger, equalized, and then treated, first, biologically and second, chemically. Inorganic chemicals, such as aluminum sulfate, were added approximately 40 feet ahead of the Sandfloat Sedifloat to allow for thorough mixing before entering the central flocculating compartment. Both the influent to and effluent from the 30-gpm pilot Sandfloat Sedifloat unit were taken by Norwalk Wastewater Treatment Plant technicians for analysis by the Norwalk City Laboratory.
