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

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

effect of natural soil characteristics on the disposal of septic tanks final effluent

In this study, the leaching capacity of the soil to absorb the final effluent from septic tanks was investigated through percolation rate tests conducted on three locations of different soil types. The results revealed that the infiltration or percolation capacity of the investigated soil system was essentially controlled by the nature and rate of the solids accumulation at/or near the soil surface and not of the soil structure