Marco Shores WWTP, Marco Shores, FL Case Study This 300,000 GPD facility at Marco Shores, FL employs USBF bioreactors immediately followed by microscreen filtration. No additional filtration is employed.  As illustrated by the operating data tabulated below, the plant designed for 10/10/10 mg/l BOD/ TSS /TN consistently delivers very low BOD, TSS and Total Nitrogen.  Disinfection in this plant is by chlorination. OPERATING RESULTS  Date TSS Pre-Filter   [mg/l] TSS Final Effluent [mg/l] BOD Final Effluent [mg/l] TN Final Effluent [mg/l] TP Final Effluent [mg/l] Fecal Coliform Final Effluent   [CFU/100ml] August 5, 2003  3  0.8        1 August 6, 2003  28  0.8        1 August 7, 2003    1.1        1 August 11, 2003  2.3  2.1         August 12, 2003  4.0  3.3         August 13, 2003    0.6  2.4  4.2  3.1  1 August 14, 2003    0.7        1 August 18, 2003    6.3        1 August 19, 2003    6.9        1 August 20, 2003    0.6        1 August 21, 2003    1.1        1 August 26, 2003    2.2        1 August 27, 2003    1.4  3.6  3.54  2.8  1 August 28, 2003    0.8        1 August 29, 2003    1.6        1 September 8, 2003    2.6        1 September 9, 2003  5.0  0.8        1 September 10, 2003    1.0  2.2  3.8  3.5   September 11, 2003    0.9        1 Design Parameters    10  10  10    10 Total Phosphorus was NOT the plant design parameter.