Effluent Disposal

Laying Land Drains

Land Drain - side view. BioBubble Sewage Treatment Plants, Co. Donegal, Ireland

To achieve even distribution, land drains should be laid in a herringbone or similar pattern depending on the site. Rigid Perforated Plastic pipes, or plastic corrugated land drain may be used. This is a far more cost effective system than the traditional clay ware, which can be used as an option. These products should be laid with a fall of 1 in 200 and at a minimum depth of 500mm. The pipes should be laid on a 150mm layer of clean gravel or broken stone 20mm to 50mm grade and trenches filled to a level 50mm above the pipe and covered with a plastic remainder of the trench can be filled with normal soil.

Note: if the winter water table rises to within 1m of the invert of the irrigation system an alternative method of disposal will be necessary. This can sometimes be achieved by discharging into shallow trenches laid in the topsoil. Alternatively the effluent can be pumped to a suitable area using effluent pump sets

The extent of the treated water disposal is in general based on the quality of the final effluent and the type of ground into which it is to be discharged.

If conditions are suitable, the cheapest and one of the most efficient methods of disposal is by means of a subsurface irrigation system. It is simple to install, but requires careful design and installation to work efficiently.

To determine the most suitable siting and area of land required for a subsurface irrigation system, a Percolation Test in accordance with the British Standard BS 6297:1983 will be necessary. However, we recommend seeking advice from the relevant Authority whose experience and knowledge of local conditions can be invaluable.

Maintenance

The standard & satisfactory performance of a sewage treatment plant relies on the plant being desludged & serviced once a year. Maintenance & service are available with a Bio-Bubble service contract, after the tank has been commissioned.

Contact BioBubble for all your sewage treatment system installation and maintenance requirements.