effect of retention time and length to width [L/W] ratio on the removal efficiency of BOD5, SS, and TS in septic tanks

ABSTRACT

In this study, the effect of retention time and length to width ratio on septic tank efficiency was investigated through a laboratory model. The model was designed based on dimensional analysis. The model was operated by using municipal wastewater from the inlet to Dar Seit, Muscat Sewage Treatment Plant. The removal efficiency of BOD5, SS, and TS in the septic tank model was found to increase with the increase of retention time up to two days beyond which the increase was not substantial