INTELLIGENT SEWAGE OVERFLOW MEASUREMENT

Sewage collects in the sewer system and, in Central Europe, almost invariably ends up in treatment plants. Sewage can contain all different types of pollutants and contaminants, everything from heavy metals and various chemicals to bacteria, fungi, viruses and nitrogen phosphorous compounds that can lead to excessive nutrients in stagnant water in particular. Such a variety of contaminants necessitates the use of a variety of purification and treatment processes. Initially, mechanical devices such as rakes, screens and filters of various sizes are used here. After that, pollutants are broken down into harmless components or components that are easier to remove from water. This is done using both microbiological and abiotic chemical processes. Any bacteria, fungi, viruses or other harmful organic compounds that remain can be destroyed with the help of chlorine, ozone or ultraviolet radiation. After that, the processed water flows into a natural body of water via a pre-flooder or is channelled into groundwater by means of a controlled trickling process.

Water treatment keeps our rivers, lakes, etc. from becoming contaminated. If, however, such a large amount of rain should fall that our sewers become unable to absorb it, the wastewater in the sewers will go its own way, so to speak. In the worst case, the increasing pressure can cause «fountains» of wastewater to shoot out of sewer openings and possibly even contaminate drinking water. That’s why spillover walls are installed in sewer systems. On the other side of these walls are rivers or canals. When necessary, the excess water flows over the wall and into the natural water. This setup is actually only an option for an extreme emergency, however, as it cannot prevent pollutants and contaminants from making their way into the environment. It’s therefore crucial to precisely determine where and in which amounts sewage runs off via this emergency spillover system. KELLER supplies the pressure measurement technology needed for this. Here, KELLER «Logger» software calculates the total spillover volume using data from the DCX-22AA data logger, which measures water levels. Three trigger levels for the data logger can be set in the «Logger» software system in order to regulate the logging speed and the initiation of the flow calculation. The DCX-22AA is installed in the sewer system with the level sensor placed as low as possible. The battery compartment is installed just below the manhole cover on the pavement or the street.

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