Phase II – Filtration

In the first post in this series, the first stage of the treatment process was discussed.  Basically, the concept is that the wastewater from the plumbing systems exits the house via a pipe and through the power of gravity, flows into the septic tank.  Over a relatively short period of time, the waste becomes separated into liquids and solids.  After this the second stage of treatment takes place and what follows is an explanation of this second leg.

For the second stage of the treatment procedure (the filtration process) the effluent flows from the septic tank to the leach (absorption) field where it is eventually soaked up and dealt with by the dirt. If the absorption area is uphill from the septic system, the water initially moves right into a separate storage tank called a dosing storage tank. A pump then relocates the liquid to the distribution system in the absorption field for handling by the dirt. If no pump is required, the effluent will merely leave the septic tank (via a pipeline developed to permit only the effluent to leave), and will then proceed via a pipeline to the absorption field. A typical absorption field houses a system of perforated pipelines buried in trenches. The bottom of the trenches are filled with crushed stones or a similar product to ensure that the pipelines do not become obstructed and to allow for equal distribution of the wastewater into the dirt. As the water “percolates” down through the ground, the soil itself functions as a filter removing damaging bacteria, viruses, etc. from the effluent, prior to it eventually entering the underground water system.
There are numerous designs that can be utilized for the absorption field. Numerous ones consist of specific trenches as described in the previous paragraph, although they may be set in place in different ways as needed by the topography. Some systems might make use of a seepage pit instead, where the effluent empties into a large pit with a perforated or open-jointed cellular lining which permits the effluent to seep into the surrounding ground. These generally call for a lot less land area, however are only a good idea when normal absorption areas are not viable and also wells are not threatened. A specific home owner (or potential purchaser) ought to know specifically how the particular system on a lot is outlined, how it runs, as well as how to ideally keep it.

This completes the basics of a septic system.