[ Aerial view of district heating supply facility using Tancehon sewage heat ]
Seoul Metropolitan Government has begun the Tacheon sewage heat recovery project, which consists in recycling water that is discharged from the Tacheon Sewage Treatment Center into the Hangang (River) to generate heat for around 20,000 households.
Scheduled for completion by August 2014, the project entails the installation of various facilities including seven 9Gcal/h heat pumps, heat supply pipes and electrical rooms. After a one-month trial run starting in September 2014, the produced heat will be supplied to the Korea District Heating Corporation.
Sewage heat utilization systems have been widely used in north European countries such as Norway and Sweden since the first and second oil crises, but in recent years they have been used domestically to heat small buildings. At present, the Tancheon, Seonam, Nanji and Jungnang Sewage Treatment Center in Seoul discharge into the Hangang (River) a daily average of 4.39 million tons of sewage, which contains potential heat of around 10°C in winter. The project aims to actively utilize this discharged water.
If this project is expanded to use sewage heat from all of the Sewage Treatment Center including the one in Seonam, the cooling and heating energy generated by sewage heat will be supplied to 110,000 households, i.e. 22% of the 487,000 households which use district heating in Seoul.
Beginning with this sewage heat-generated heating supply, Seoul Metropolitan Government plans to use water from the Han River and the Junnangcheon (Stream), among others, and the underground water from tap water intake plants and subway stations, to further develop its energy supply.