Design Criteria

To remove 55% of suspended solid and 30% of BOD5 of influent water

At Q_p, the square overflow rate, SOR=1500 gal/ft².day for each tank, check SOR at Q_A

Detention time D_T=2.0 hr based on Q_A

Submerged orifice for inlet

V-notch outlet weir

Weir width=25'

For a well-designed and operated basin, the typical removal of suspended solids and BOD5 from municipal waster water as a function of overflow rate is given in Figure 11.

Figure 12 shows the removal of suspended solids and BOD5 with respect to detention time in primary clarifiers.

(1) Waste Water Treatment Plants, Syed R. Qasim, p268.
(2) "The Committee of Great Lakes--Upper Mississippi River Board of State Sanitary Engineers (Ten States), Recommended Standards for Sewage Water, Health Education Service, Albany, New York, 1978.