erillisviemärien

Erillisviemärit, often translated as separate sewer systems, are wastewater management systems that divide sewage from stormwater. In such a system, two distinct pipe networks are used. One network is dedicated to collecting and transporting domestic and industrial wastewater, known as sanitary sewage. This sewage typically goes to a wastewater treatment plant for purification before being discharged. The second network is designed for collecting and transporting rainwater runoff from surfaces like roofs, roads, and yards. This stormwater is often directed to natural water bodies, such as rivers or lakes, after minimal or no treatment, as it is generally less polluted than sanitary sewage.

The primary advantage of separate sewer systems is that they prevent untreated or partially treated sewage from mixing with stormwater. This is crucial during heavy rainfall events, as combined sewer systems can overflow, releasing raw sewage into the environment. By separating the two, the volume of water reaching wastewater treatment plants is reduced, making treatment more efficient and less costly. It also reduces the risk of contamination of surface waters with sewage. However, the implementation of a separate sewer system requires a more complex and extensive pipe infrastructure, which can be more expensive to install and maintain compared to combined systems. The planning and construction of separate systems are a significant undertaking for municipalities aiming to improve their wastewater management and environmental protection.