Mobile QR Code QR CODE : Journal of the Korean Society of Civil Engineers
Title Leachate Concentration to Groundwater Considering Source Depletion for Risk Assessment in Vadose Zone of Contaminated Sites
Authors 장선우(Chang, Sun Woo)
DOI https://doi.org/10.12652/Ksce.2020.40.6.0583
Page pp.583-592
ISSN 10156348
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.