The septic tank is probably the single most important treatment unit in residential septic systems as it accomplishes approximately 50% of the ultimate treatment and up to 80% removal of solids.
Without this treatment, the discharge of residential wastewater to downstream components can overload and cause premature failure. The septic tank treats wastewater through physical, chemical and biological processes and this article will focus on the physical treatment.Physical treatmentFlow attenuation occurs when higher velocities come into a tank that are then somewhat dampened by the septic tank. Even with that, there is still the risk that high velocities can disrupt settling.
