Septic tank (decanter/digester)
Treatment > Septic tank
The purpose of the tank is to meet the need to treat urban-type waste water, although the two-chamber design makes it ideal as a sand separator and decanter.
Resmat septic tanks are sized for an intake of 200 l/p.e. per day.
Performance figures for this treatment system are as follows:
BOD5 REDUCTION 35%
SS REDUCTION 90%
The septic tank has two chambers. The waste water enters the first chamber where the heaviest matter falls to the bottom of the tank and the lighter matter floats above water level.
The water passes into the second chamber through orifices in the central section of the dividing wall separating the two chambers, thus ensuring that the matter decanted in the first chamber cannot pass through to the next one.
The same process takes place in the second chamber but in a smaller amount. The water treated will be drained out through a pipe from the central section of the tank to prevent carrying the heavy and light solids. The process of anaerobic degradation occurs in the two chambers.