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Table 1 Typical Residential Wastewater Strenifths <br /> Averages Weekly Peak Rarely Exceed <br /> mg/L mglL mg/L <br /> BODS 130 200 300 <br /> TSS 40 60 150 <br /> TKN—n 65 75 150 <br /> G&O 20 25 25 <br /> With higher influent strengths, maintenance may increase, although with a diligent service and <br /> monitoring program, performance is not expected to suffer. Typical intermittent sand filter design <br /> criteria are: <br /> Type of Design Filter Effective Uniformity Dose <br /> operation loading rate depth Size Coefficient limit <br /> gal/ftp •d inches Djo, mm C„ gallorifieeldose <br /> Single pass 1.25 24 0.30 + 3 to 4 0.25 <br /> Below in Figure 2, a typical recirculating filter is shown. <br /> Figure 2: Recirculating Sand Filter <br /> Recirculating filters are also capable of treating septic tank effluent to advanced wastewater treatment <br /> levels or better. The following recirculating filter effluent characteristics are typical averages: <br /> CBODS: 10 mg/l <br /> TSS: 10 mg/l <br /> NO3-n: 30 mg/l Ago <br /> NTP-FLT-TR8-ESB-HL9-1 <br /> 2180 <br /> Page 2 <br />