erillisviemäröinnille

Erillisviemäröinti refers to a wastewater management system where separate sewer lines are used to convey different types of wastewater. Typically, this involves two distinct pipe networks: one for sanitary sewage (wastewater from toilets, sinks, and showers) and another for stormwater (rainwater and meltwater from streets, roofs, and other surfaces).

The primary advantage of a separate sewer system is the prevention of combined sewer overflows (CSOs). In older, combined sewer systems, both sanitary sewage and stormwater are transported in the same pipes. During heavy rainfall, the volume of water can exceed the capacity of the system, leading to untreated sewage being discharged directly into rivers, lakes, or oceans. Erillisviemäröinti mitigates this by keeping the flows separate, allowing sanitary sewage to be treated at a wastewater treatment plant while stormwater can be managed more locally or discharged directly after minimal treatment if necessary.

Implementing erillisviemäröinti can be costly, especially in existing urban areas where retrofitting separate systems can be disruptive and expensive. However, the long-term benefits include improved water quality, reduced risk of pollution-related health hazards, and more efficient operation of wastewater treatment facilities. New developments are increasingly designed with separate sewer systems to avoid the problems associated with combined sewers. The design and maintenance of erillisviemäröinti systems require careful planning to ensure effective separation and conveyance of both wastewater streams.