facultative lagoons typical layout: two to three …ceae.colorado.edu/~silverst/cven3414/facultative...
TRANSCRIPT
FACULTATIVE LAGOONS Typical layout: two to three ponds in series: AREAL LOADING RATE CALCULATIONS:
Average winter temperature (coldest month, oC)
Total System BOD loading rate (kg/ha /day)
Primary cell loading rate (kg/ha /day)
> 15 45-90 100 0 - 15 22 - 45 60
< 0 11 - 22 40 PHYSICAL CHARACTERISTICS
Location System Detention Time (days) Southern US 6 - 30
Michigan 120 - 180 Colorado 45 plus 1 - 3 day polishing
Pond Water Depth (m)
Sludge Depth (m)
Total Depth (m)
Primary 0.6 - 1.8 0.6 1.2 - 2.4 Secondary 2.4 - 3.0 0.3 2.7 - 3.3
Experience with operating lagoons throughout the US indicates that design guidelines will result in removal of ~ 85% of influent BOD. Effluent suspended solids due to algae growth may require polishing in a sand or gravel filter or other solids separation process.
