Before wastewater can be purified in the treatment plant, it must be collected and transported. This is done via a very extensive sewer network with secondary collectors, main collectors and pumping stations. For rainwater treatment, additional systems are available in the sewer system. Around 92,000 households from the urban area as well as from Ergolding, Altdorf, Furth (district Arth) and Kumhausen are connected to the Landshut sewage network.
It counts for kilometers about as much as the distance from Landshut to Bolzano: around 370 kilometers of sewer pipes are located under the urban roads and paths. The largest part are so-called mixed water channels (206 km). In them, the dirt and rain water runs to the sewage treatment plant in Landshut-Dirnau, where it is purified and returned to the natural cycle via the Isar River.
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The other part of the network consists of separate dirt and rainwater channels, the so-called separation system. Rainwater drains here to relieve the rest of the drainage system in separate channels - in the case of the district Achdorf, for example, these open in the Rossbach or in the northern Wolfgangiedlung the rainwater is introduced via infiltration from the earth's surface directly into deeper soil layers. Therefore, residents in the areas with separation system must pay special attention to ensure that no harmful substances come into the rainwater channel. Otherwise they will get into the natural waters without being cleaned up and disturb the ecological balance.
Causes of odors from the canal
Unfortunately unpleasant odors in the channel can not be avoided. But sometimes it comes to massive odor nuisance outside the channel. This may be due to the fact that the water consumption is continuously decreasing, which also causes less sewage to flow in the sewers. Due to the low flow rate, sludge settles faster and the decay processes lead to odor nuisance. This process is exacerbated by high temperatures and longer droughts in summer.
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As a rule, there is sufficient air circulation in the sewer system that prevents toxic or foul-smelling gases from concentrating in one place. This natural air circulation may be disturbed by unfavorable structural conditions in the sewage system but also due to weather conditions.
Occasionally it also leads to unauthorized discharges into the sewer system, which favor the formation of foul-smelling gases. Another cause is channel blockages.
What countermeasures are taken by public utilities?
The sewer system of the city of Landshut is regularly cleaned by Stadtwerke Landshut with special vehicles. At the points of the sewer system where regular flushing is not enough, we install odor traps, artificial ventilation, filter systems or seal the drainage cover odor-tight. In addition, we monitor the discharges into our sewer system and regularly take wastewater samples, which we analyze in our sewage treatment laboratory.
If there are massive odor problems from the sewer over a longer period of time, please contact the Wastewater Department of Stadtwerke - by phone at 0871 1436 2503 or by e-mail email@example.com.
The public sewer system of Landshut with a total length of more than 370 km must be cleaned regularly. Otherwise it can lead to deposits and as a result to unpleasant smells and blockages. It thus ensures the dewatering comfort of the inhabitants, but also contributes significantly to the value retention of the sewer network.