Wastewater collection usually takes place by means of gravity from domestic households and the industry, which is then pumped into the wastewater treatment plants through pumping stations.
Two main systems for the wastewater collection are collection systems with combined sewers and collection systems with separated sewers for rainwater and wastewater. Combined sewers transport the wastewater from private households and companies as well as rainwater through the same pipe. Many new collection systems provide separate sewers for wastewater and rainwater.
Rainwater collected in sewers are led either directly to the pumping stations or to rainwater storage tanks, where it is then mixed with the wastewater at a later stage. As the amount of rainwater is unpredictable, it may be necessary to store the rainwater either in basins around the countryside or in stormwater tanks inside the wastewater treatment plants. This makes it easier to control the flow of the rainwater as it is mixed with the wastewater when the plant has the capacity to clean the rainwater.
For wastewater collection, AVK offers gate valves, check valves, knife gate valves, air valves, service connections, couplings, fittings, repair clamps, and accessories.