Rainwater drainage

Sewerage

Non-collective sanitation concerns around 13 million people in France and the number of installations is estimated at around 5 million. This method of purification in its own right refers to any sanitation system carrying out the collection, pre-treatment, treatment, infiltration or discharge of domestic wastewater from homes not connected to the public sanitation network.
The main disorders linked to non-collective sanitation systems are:
- the overflow of the pit and the upwelling of effluents by sanitary devices;
- problems of sanitation, pollution of surface or underground water, caused by waterlogging of the land by untreated or insufficiently treated water;
- the appearance of foul odors;
- degradation of concrete in septic tanks.
Badly designed or badly operated, facilities can cause serious environmental damage and health risks.

Poor sewage disposal

The lack of ventilation

The foul odors are the mark of an insufficiency, or even a total absence of ventilation of the septic tank with all water.
They come from the accumulation of hydrogen sulphide (H2S), this gas with the characteristic smell of rotten egg, generated during the fermentation linked to the pretreatment of wastewater.
This lack of ventilation is also the cause of degradation of the concrete in the septic tanks.
The action of hydrogen sulphide results in an attack on the concrete by sulfuric acid: dissolution of cement compounds and formation of expanding minerals.
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