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A sewage plant serves to clean faecal matter from city and village wastewater. So far good, but the operating principle and technical design of a sewage plant is much more complicated, of course.

Operating principle and design of a sewage plant

The dirty wastewater is transported to the sewage plant through the sewers. If, at the same time, rain water is drained via the sewers, the sewage plant has to be fitted with an additional rain drainage system so that it is not overwhelmed by the volume of water. Once at the sewage plant, the wastewater first flows through a rake that removed the coarse dirt. This mostly has a mesh width of several centimetres. The filtered wastewater is then fed to the sand trap. The sand trap serves to remove small dirt particles such as gravel and sand, which gather on the floor of the trap and can then be removed. The sand trap is needed because the small particles disrupt the smooth operation of the plant or could damage it. The wastewater is then fed through the sedimentation basin. Undissolved particles, such as faecal matter and toilet paper, settle or float to the surface. These materials arrive in what is called the digestion tower. The remaining wastewater flows to the next cleaning process in the aeration basins. In the activated sludge basin, the wastewater is converted into activated sludge by bacteria or other micro-organisms. This is a continuous process, in which wastewater is constantly flowing into the basic and the same quantity of cleaned activated sludge flows out of the basin. The activated sludge basin together with the clarifier forms a single unit. The activated sludge is separated from the wastewater in the clarifier Part of the sludge is returned to the activated sludge basin, the other part is mixed with the solids from the sedimentation basin in the digestion tower. The cleaned wastewater is released As in a biogas plant, gas is produced in the digester tower, in this case digester gas, which can be pumped to a co-generation plant The remaining digester sludge us separated from the remaining water in the post-thickener and can then be used in agriculture as fertiliser

This is merely an example of a sewage plant as frequently found in Central Europe However, there are dozens of other variants and plants for treating wastewater.

NieRuf fittings, e.g. ball valves and butterfly valves in sewage plants

NieRuf as a system provider for pipe construction offers great support for the construction and maintenance of sewage plants. When processing wastewater into digester gas, fertiliser and water, the flow volumes have to be constantly controlled and checked. NieRuf offers electrically and pneumatically operated butterfly valves and ball valves for this. In order to prevent unwanted reflux into the systems, twin-plate check valves can be used. So-called digester gas is produced as a result of operating the digester tower; this is then used in a co-generation plant to generate electricity. Only fittings with DVGW gas approval should be used in the transport of the digester gas, and NieRuf is happy to provide support here Get in touch and we will be happy to help you select the right fittings so that your sewage plant also reliably cleans wastewater in the future.

 

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