Case Study

Jungnang, South Korea


High-Speed Wastewater Treatment Process
2.8 hours HRT with BBF


Tomorrow Water’s flagship plant at the Jungrang municipal treatment facility is one of the largest in Korea. Located in the heart of Seoul, the facility was designed as part of a water reuse center to protect the ecosystem of the Han River.

This plant has replaced primary clarifiers in its 66 MGD treatment train with underground BBF Primary filters, and added 132 MGD in additional BBF biofilters to manage wet weather flow.

This high speed filtration facility is designed so that 66% of total influent will be treated to < 40mg/L of BOD before discharge.

Most importantly, the wet weather flow treatment facility is replacing a 66MGD primary clarifier so that the City can save valuable space in its wastewater treatment facilities.

Project Purpose

  • Upgrade facilities and move treatment train underground

  • TMDL (BOD)

Project Outcomes

  • Underground construction allowed for above-ground land repurposing

  • Ecological protection

  • Reduced equipment footprint

Facility Details

  • Capacity:  132 MGD (Primary: 66 MGD)

  • Process: Pretreatment + BBF (WWF) + BBF(Secondary)

  • In operation since 2016

Primary Treatment

  • Underground treatment train

  • Modernization and retrofit

  • TMDL (BOD)

Capacity: 66 MGD

Process: BBF-F

Secondary Treatment

Underground construction



Capacity: 66 MGD

Process: BBF (DND)+BBF (N)+MDF

Wet-Weather CSO Treatment

Project Purpose

  • Underground construction

  • Modernization


Capacity: 132 MGD

Process: BBF-F

Construction of the first train retrofit. Completed October 2017, treating 66MGD + 132 WWF.

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