Design and Operation of the Rainwater-Greywater Hybrid System : SNU No. 39 Building

Shim, In-tae; Park, Hyun-ju; Kim, Tschung-il; Jung, Sung-un; Han, Moo-young; Namkung, Eun; Shim, In-tae; Park, Hyun-ju; Kim, Tschung-il; Jung, Sung-un; Han, Moo-young; Namkung, Eun

doi:2016.38.12.676

The Korean text of this paper can be translated into multiple languages on the website of http://jksee.or.kr through Google Translator.

J Korean Soc Environ Eng > Volume 38(12); 2016 > Article

Original Paper

J Korean Soc Environ Eng 2016;38(12): 676-682. doi: https://doi.org/10.4491/KSEE.2016.38.12.676

빗물-저농도 오수 하이브리드 시스템의 설계 및 운전 평가 : 서울대 39동

심인태¹, 박현주², 김충일², 정성운³, 한무영¹, 남궁은⁴

¹서울대학교 건설환경공학과
²서울대학교 건설환경종합연구소
³(사)빗물모아 지구사랑
⁴명지대학교 환경에너지공학과

Design and Operation of the Rainwater-Greywater Hybrid System : SNU No. 39 Building

In-tae Shim¹, Hyun-ju Park², Tschung-il Kim², Sung-un Jung³, Moo-young Han¹, Eun Namkung⁴

¹Department of Civil and Environmental Engineering, Seoul National University
²Integrated Research Institute of Construction and Environmental Engineering, Seoul National University
³Incorporated Association, Rainwater for All
⁴Department of Environmental Engineering and Energy, Myongji University

Corresponding author

Eun Namkung ,Tel: 031-330-6693, Fax: 031-336-6336, Email: enamkung@mju.ac.kr

Received: November 25, 2016; Revised: December 26, 2016; Accepted: December 28, 2016. Published online: December 31, 2016.

ABSTRACT

In this study, rainwater-greywater hybrid system was installed and operated for 1 year in order to evaluate its water quantity, water quality, and economic efficiency in building no. 39. This system was expected to overcome each disadvantages of and maximize each advantages. Low-greywater that was washed up from shower room was treated by MBR (Membrane Bioreactor) and ozone oxidation. Rainwater that was collected from the rooftop was stored in a reservoir, and then transferred to the storage tank that was mixed with treated greywater. After 1 year operating in building no. 39, rainwater and greywater was used to supply 2,599 m³ of toilet flushing water. In terms of water quality, rainwater was satisfied far the greywater reuse standards except for E.coli. Moreover, low greywater quality was acceptable except for E. coli, BOD, SS, and turbidity. In addition, economic analysis was obtained from benefit-cost ratio (B/C) with 1.11. It implies that the feasibility of the project was reasonable. Furthermore, various research and policy to improve the economic efficiency of water recycling facilities is required to expand the use of water recycling facilities.

Key Words: Rainwater-Greywater Hybrid System, Water Reuse, Toilet Flushing Water, Economic Analysis