INSTALLATION OF THE INFILTRATION SYSTEM
The most popular system is infiltration drainage. It is a system of drainage pipes responsible for evenly conveying the treated sewage for further treatment in the drainage field. The length of the drainage depends on the number of permanent users of the treatment plant (population equivalent). In general, 12 m of drainage per permanent resident is assumed, but this figure depends on the permeability of the land on which the installation is located (the permeability of the ground can be checked by a percolation test). In the case of wetlands or poorly permeable ground, the drainage dimensions should be multiplied by two, while in the case of very permeable ground, they should be divided by 1.5 (for ease of use, please use our drainage path calculator). One drainage line should be laid at a distance of 1.5 m from the groundwater, and its length should not exceed 20 m.
The drainage pipe should be laid in a drainage ditch at least 50 cm wide. It is generally accepted that the distance between one pipe and another should be at least 1.5 metres, but this number, as well as the length of the drainage pipe, also depends on the permeability of the soil (for correct calculation of the distance, please use a drainage path calculator). The drainage pipe must be laid on a 10 cm layer of sand, another necessary layer, at least 40 cm long, is the gravel that covers the pipe. The gravel layer should be covered with geotextile, which protects the drainage pipe from silting up with soil and plant roots. The optimum depth for the drainage setting is about 40-50 cm, the maximum is 80 cm (there are no aerobic bacteria below). The proposed slope of the drainage is 1%. It is recommended that each drainage line has its own aeration chamber.
Examples of other infiltration systems:
- Sand filter (vertical and horizontal)
- Hydrophytic beds
- Infiltration packages
PLEASE NOTE! Infiltration tunnels have become very popular in recent years. However, they can be used as an aerobic sewage treatment system, provided they are installed correctly. A situation where treated effluent is discharged to a single location is unacceptable (the effluent is then not provided with the conditions necessary for the treatment process to take place and is only discharged to the soil in a pre-treated state).