If rooms or land areas are lower than the sewers and there is a risk of water retention, Wastewater lifting plants are used.
In many houses, wastewater falls below the so-called backflow level (RSE). Below the RSE means that drainage through the natural gradient is no longer possible. For example, when basements are lower or rainwater can not seep away. Wastewater lifting plants are required in such places. They pump the resulting wastewater or
rainwater to the sewerage level.
Wastewater lifting plants are used at the lowest possible point - be it freestanding, in a pit or in a shaft. They are available in price ranges from under 100 to far more than 500 euros. But the home builder does not have the completely free choice of his device. It must belong to one of the three type categories.
Wastewater lifting plants pump the water into the sewage system
Type one are sewage treatment plants for wastewater containing sewage, so-called black water from flush toilets or urinals. They collect the water in gas- and watertight containers and pump it through a pressure pipe to the sewer system. The system is vented through a pipe above the roof. Type two are lifting systems for faeces-free, slightly polluted so-called gray water. These are, for example, the bath or shower drain and rainwater. In these lifting systems, the containers are also waterproof, but only closed by a lid. A submersible pump with floater automatically starts operating at a specified water level.
Did you know? There are three types of wastewater!
Type three is small-scale waste water sewage treatment plants of limited use. This in turn means that the sources of dirty water and the number of users are low. This is the case, for example, when another toilet and in addition a maximum of a hand basin or a shower are connected. These are typically retrofitted sanitary facilities: the home spa, the garden toilet or the guest-room washbasin in the basement. Unlike types one and two, these devices do not have accumulators. Often the devices or at least the pumps are mounted directly below the drain. The feces or the toilet paper are shredded by a cutting unit.
But no matter what type they are: All units must comply with the standards of DIN EN 12050 for sewage lifting units for building and property drainage.