Original Article

Econ. Environ. Geol. 2016; 49(5): 361-370

Published online October 31, 2016

https://doi.org/10.9719/EEG.2016.49.5.361

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Calculation of Rainwater and Groundwater Fraction in Sewerage: A Case Study in Deokjin Park, Jeonju

Seung-Hyun Choi1, Kangjoo Kim1*, and Sang-Ho Moon2

1Department of Environmental Engineering, Kunsan National University, Jeonbuk, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

Correspondence to : kangjoo@kunsan.ac.kr

Received: September 30, 2016; Revised: October 28, 2016; Accepted: October 31, 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

It is well known that the inflow of rainwater and the infiltration of groundwater to sewerage (I/I) increase the sewage and burden sewage treatment plants and lower their treatment efficiency. Therefore, it is important to estimate the amount of I/I. In this study, well groundwaters, public water supplies (PWSs), and sewage and rainwater channels were investigated to check whether oxygen and deuterium isotopes could be used as a tool for I/I estimation. This study shows that the isotopic composition of PWS in Jeonju area is very consistent over time and distinctly lighter than the circulating local rainwater (CLR) because it is supplied from Yongdam Dam, which is located about 40 km inland to the east in the mountainous area. Considering the fact that sewage mostly originates from the PWS, we could calculate the amounts of CLR in the sewerage from a monitoring station using unaffected rainwater and tap water as mixing end members. The calculation revealed that the CLR fraction ranged from 50% to 90% depending on observation time. This is well supported by the dilute natures of the sewages at the station. The fraction of PWS in investigated well waters were about 46%, indicating that leaking of PWS is very serious and is an important groundwater source in the study area. Since the infiltration of such groundwater may not alter the isotopic composition of sewage significantly, the actual I/I would be much greater than the calculated ones.

Keywords Deokjin Park, oxygen-deuterium isotope, public water supply and sewerage, groundwater, Infiltration/Inflow (I/I)

동위원소를 이용한 하수 내 지하수 및 우수 함량 산출: 전주 덕진공원 유역 사례

최승현1 ·김강주1* ·문상호2

1군산대학교 환경공학과, 2한국지질자원연구원

요 약

Article

Original Article

Econ. Environ. Geol. 2016; 49(5): 361-370

Published online October 31, 2016 https://doi.org/10.9719/EEG.2016.49.5.361

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Calculation of Rainwater and Groundwater Fraction in Sewerage: A Case Study in Deokjin Park, Jeonju

Seung-Hyun Choi1, Kangjoo Kim1*, and Sang-Ho Moon2

1Department of Environmental Engineering, Kunsan National University, Jeonbuk, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

Correspondence to:kangjoo@kunsan.ac.kr

Received: September 30, 2016; Revised: October 28, 2016; Accepted: October 31, 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

It is well known that the inflow of rainwater and the infiltration of groundwater to sewerage (I/I) increase the sewage and burden sewage treatment plants and lower their treatment efficiency. Therefore, it is important to estimate the amount of I/I. In this study, well groundwaters, public water supplies (PWSs), and sewage and rainwater channels were investigated to check whether oxygen and deuterium isotopes could be used as a tool for I/I estimation. This study shows that the isotopic composition of PWS in Jeonju area is very consistent over time and distinctly lighter than the circulating local rainwater (CLR) because it is supplied from Yongdam Dam, which is located about 40 km inland to the east in the mountainous area. Considering the fact that sewage mostly originates from the PWS, we could calculate the amounts of CLR in the sewerage from a monitoring station using unaffected rainwater and tap water as mixing end members. The calculation revealed that the CLR fraction ranged from 50% to 90% depending on observation time. This is well supported by the dilute natures of the sewages at the station. The fraction of PWS in investigated well waters were about 46%, indicating that leaking of PWS is very serious and is an important groundwater source in the study area. Since the infiltration of such groundwater may not alter the isotopic composition of sewage significantly, the actual I/I would be much greater than the calculated ones.

Keywords Deokjin Park, oxygen-deuterium isotope, public water supply and sewerage, groundwater, Infiltration/Inflow (I/I)

동위원소를 이용한 하수 내 지하수 및 우수 함량 산출: 전주 덕진공원 유역 사례

최승현1 ·김강주1* ·문상호2

1군산대학교 환경공학과, 2한국지질자원연구원

Received: September 30, 2016; Revised: October 28, 2016; Accepted: October 31, 2016

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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