Seoul City "Managing Han River Water Quality Even During Heavy Rain"... Basic Plan Initiated for Two CSOs Retention Basins

Plans to Install Two Additional 100,000-Ton Storage Tanks Beyond Three Operating and Three Under-Construction CSO Storage Tanks
Temporary Storage of High-Concentration Sewage During Rainfall → Purification and Discharge from Water Reclamation Center After Rain Stops

[Asia Economy Reporter Lim Cheol-young] Seoul City announced on the 2nd that it will begin a basic planning project to install 'CSOs (Combined Sewer Overflows) retention tanks' at Ttukseom and Daechi retention basins to prevent the problem of high-concentration sewage flowing into the Han River untreated due to the capacity limits of sewer pipelines during heavy rainfall.

Since 2012, Seoul City has been installing CSOs retention tanks. Through three completed retention tanks, it has secured a storage capacity of 58,000 tons, which is expected to not only improve the water quality of the Han River but also protect the river ecosystem by solving issues such as fish deaths caused by the inflow of high-concentration sewage.

Including the three retention tanks currently under installation at Eungbong, Hwikyung, and Heukseok, Seoul plans to sequentially install five additional retention tanks with a total capacity of 156,000 tons by 2030. Adding the three previously installed tanks at Saemal, Gayang, and Yangpyeong 1, the city will have a total of eight 'CSOs retention tanks.'

Once the CSOs retention tanks at Ttukseom and Daechi are completed, an additional 103,000 tons of retention capacity will be secured on top of the existing retention basins, which is expected to serve as disaster prevention facilities to prevent flooding damage in residential areas adjacent to Jungnangcheon and Tancheon streams.

Furthermore, Seoul plans to contribute to achieving the Ministry of Environment's strengthened 'Total Water Pollution Load Management' target water quality (BOD 4.1 → 3.8 mg/L) starting this year.

Choi Jin-seok, Director of the Water Circulation Safety Bureau of Seoul City, said, "The installation of retention tanks that temporarily store high-concentration sewage generated at the initial stage of rainfall in retention basins will improve river water quality," adding, "It is also expected to prevent eutrophication caused by water pollution and protect the river ecosystem by solving fish death problems."

This content was produced with the assistance of AI translation services.