Multiple regression design equations for stabilization ponds

Employing the results gathered over a 22 month period for the operation of facultative and maturation ponds in the Cayman Isles a series of multiple regression design equations was developed which, for both the facultative and maturation ponds, relate either BOD removal or the removal of faecal coliform organisms to a number of environmental and other parameters. For the facultative ponds BOD removal was principally influenced by not only loading and retention time but also by solar radiation and hours of sunshine, rainfall and pond depth. On the other hand, loading, retention time, pond depth and the wastewater electrical conductivity were the principal factors influencing FC removal. In the maturation ponds faecal coliform removal was influenced by the same parameters as for the facultative ponds but with BOD removal neither pond depth nor rainfall appeared to be of any importance.