Mixed water overflow basin
Mixed water overflow basins are part of the mixing system. In the event of heavy rainfall, part of the wastewater is discharged into the river. The wastewater is highly diluted, so the effects on the river are minimal.
Mixed water overflow basins are large basins that overflow from a certain water level.
The basins have an inflow channel that directs the wastewater from the settlement into the basin and two outflow channels that are separated by an overflow. One outlet channel leads the regular wastewater to the sewage treatment plant and the second outlet channel leads the overflowing wastewater into the river.
The size of the basin is adjusted so that the water only overflows during a heavy rainfall event. This means that not all the rainwater flows to the treatment plant during heavy rainfall. This prevents the purification performance of the sewage treatment plant from decreasing due to too much rainwater. The overflowing waste water, on the other hand, is led into the next river. Due to the rainwater, the wastewater is so heavily diluted that it has no harmful effects on the river water quality.