E-Andrew Sindt Creative Component S11.pdf

3.1 Wastewater Treatment Plant DescriptionThe Grundy Center wastewater treatment plant treats municipal wastewater from the Grundy Centercommunity, population of 2596 (2000 census) and a food-processing industry (salad dressingmanufacturer). The two elliptical shaped SBR basins (12.6 m wide [radius of 6.3 m], 23 m long, and 5.2m deep) were originally oxidation ditches before being renovated to their present use as SBR reactors.The facility contains a rectangular flow equalization pond (44 m wide, 97 m long, and 2.7 m deep) and asludge storage and treatment facility (Figure 3.2). The average flowrate to the treatment plant in 2005was 2680 m 3 /d (708,000 gal/d), while the design flowrate is 3150 m 3 /d (832,000 gal/d). Each SBR has amaximum operating volume of 1340 m 3 (354,000 gal), a design hydraulic retention time of 10.2 hours,and a design SRT of 20 days. A pipe located approximately 2.1 m above the floor of the SBR allowsinfluent wastewater to flow into the basin from one end and a surface decanter removes treatedeffluent at the opposite end of the basin.Figure 3.2 - Grundy Center wastewater treatment plant schematic, not to scale (Ersu et al., 2008)29