| Title |
Leachate Concentration to Groundwater Considering Source Depletion for Risk Assessment in Vadose Zone of Contaminated Sites |
| DOI |
https://doi.org/10.12652/Ksce.2020.40.6.0583 |
| Keywords |
위해성평가;토양유출수 농도;오염원고갈;불포화대;지하수;오염부지 Risk assessment;Leachate concentration;Source depletion;Vadose zone;Groundwater;Contaminated site |
| Abstract |
This study assessed source depletion in the vadose zones of contaminated sites. The possible range of infiltration rate in Korea was statistically analyzed. The results showed a trend of decreasing leachate concentration of 13 pollutants used for risk assessment. Among them, benzene, ethylbenzene, toluene, and xylene showed a lower leachate concentration in groundwater over time due to their low distribution coefficient and also possible biodegradation effects. The average values of the relative concentration could be taken as a default index due to a very small range of uncertainties. In the case of heavy metals, it was shown that the leachate concentration in a pollutant does not decrease over time. Considering the annually different infiltration, a site-specific source-depletion scenario was applied to Cheongju in North Chungcheong Province. The result was expressed as a time series of the relative concentration of the leachate concentration, and this was compared to the trend by averaged Korean infiltration. Finally, an open-source code that used Python was used to help calculate the leachate concentration by this site-specific infiltration scenario. |