빗물 집수 및 저장 시스템 개선과 수질 분석 모니터링

김철경; Chul Kyung Kim

Clean Technology, Vol.17, No.4, 353-362, December, 2011

Export Citation

빗물 집수 및 저장 시스템 개선과 수질 분석 모니터링

A Study on the Rainwater Quality Monitoring and the Improvement, Collection and Storage System

김철경^†

목원대학교 공과대학 소재디자인공학과, 302-729 대전광역시 서구 목원길 21

Chul Kyung Kim^†

Department of Material Design Engineering, Mokwon University, 21 Mokwon-gil, Seo-gu, Daejeon, 302-729, Korea

E-mail:

초록

빗물 활용은 건전한 물 순환 개념에서 중요하며, 신도시 개발 등으로 증가되는 불투수면의 증대에 따른 영향을 해소시키는 방법 중의 하나가 되므로 빗물 처리 시스템의 개선을 통한 수질 개선 방안을 연구하였다. 대전서남부지구의 개발 전 빗물 유출계수는 0.40이었으나 개발 후의 유출계수는 0.59로 산정되었다. 필터를 통과한 우수의 Cu, As, Cr, Fe, Mn 등 중금속 함량은 지하수의 중금속 함량보다 양호하였으며, 집수된 빗물의 수질은 경도, 과망간산칼륨소비량, 염소이온, 증발잔류물, 황산이온, 질산성질소 등의 항목에서는 지하수의 수질보다 양호한 것을 보여 주었으며, 중수도 수질기준을 충족시키는 것으로 확인되었다. 100일 이상 장기 저장 시에도 화장실 용수, 조경 용수 등으로 적합하였다. 종전의 빗물집수 시스템에 덮개가 있는 gutter 설치, 적합한 필터 사용 및 저장조의 지하설치 등으로 시스템을 개선하면 집수되는 수질을 100일 정도 양호하게 유지할 수 있는 것을 확인하였다.

In our nature, the utilization of rainwater is essential for healthy water recirculation. This is one of the solutions of the increment of impermeability surface according to the development of new cities; this study of the improvement of rainwater quality has been carried on through the improvement of collecting and restoring system of rainwater. The southwestern region of Daejeon City, the rainwater coefficient of run off was 0.40 and this number had computed to 0.59 after the development. After filtration of rainwater, the heavy metal (Cu, As, Cr, Fe, Mn) contents level were lower than underground water. Moreover, collected rainwater showed better quality than underground water in following criteria; hardness, permanganate consumption quality, chloride, evaporation residue, sulfates and nitrate nitrogen. This water quality met the gray water quality standards. The rainwater quality was still suitable to use as bathroom flushing and gardening after 100 days of storage. This study proved that modification (installation of cover with gutter to existing rainwater collection system, proper filtering, and installation of underground storage tank) of collection system could improve quality of water and maintain this approximately 100 days.

Keywords:Rainwater management;Rainwater utilization;Rainwater coefficient of run off;Rainwater quality;Climate change;Energy saving

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[1] Park CH, Han MY, J. of The National Academy of Sciences., 46(2), 13 (2007)

[2] Lee SK, “The Use and Management of Rainwater Resources in Terms of Building Residential Area in Gyeonggi,” Gyeonggi Research Institute, Report 2005-23 (2005)

[3] Seo KW, River Engineering, 1st ed., Goomi Book, Seoul, 188 (2006)

[4] Belinda EH, Ana D, Tim DF, J. of Environ. Manage., 79, 102 (2006)

[5] UNESCO, International Year of Freshwater 2003, UNESCO Report http://www.wateryear2003.org (2003)

[6] You TJ, “Cost Analysis of Rainwater Utilization,” The 3rd International Rainwater Utilization Workshop, UNEP-SUN Rainwater Research Center, Seoul, 33 (2003)

[7] Woo K, Hwang JD, Jeong SY, Jang GH, Clean Technol., 7(1), 43 (2001)

[8] Chung JH, Yun YN, Design for Water Resources, 1st ed., Goomi Book, Seoul, 10 (2005)

[9] KWRA, “Guideline for River Design Engineering,” 1st ed.,Korea Water Resources Association, Seoul (2002)

[10] DCCO, “Land Development Districts of Southwest Daejeon /the First type District Unit Plan,” Daejeon City Corporation (2005)

[11] Park SS, “Analysis on Heavy Matal Contamination in Soils of the Daejeon Area using GIS,” M.D. Dissertation, Hanbat National University, Daejeon (2010)