Health Risk Assessment for a Leachate Plume from a Landfill under Different Hydrogeological Conditions

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Risk assessment is an effective scientific tool which enables to quantify the human health impacts due to exposure to contaminated water. This paper aims at presenting an integrated approach for the health risk assessment of subsurface contamination by benzene leached from a landfill in the Netherlands and at demonstrating the effect of hydrogeological conditions such as the hydraulic conductivity distribution, the recharge rate and the first-order degradation rate constant on the outcomes of health risk analysis linked with particle tracking random walk approach under some contamination scenarios. The results demonstrate that hydrogeological conditions, especially the degradation rate, affect the cumulative mass of benzene in a certain plane or at an exposure point in the field of concern. The 50th fractiles are utilized as a measure of the carcinogenic risk evolution under the transient condition of the exposure duration. It is revealed that the probability distributions of the health risk vary with the corresponding hydrogeological condition and exposure duration because of the relation between the discharge rates of groundwater and the total mass of particles flowing into the exposure point, leading to the difference of a time series of the health risk variation. Moreover, the exceedance probability of the acceptable risk of 10^<-6> are estimated in the range of 0% to approximately 71% for all available cases, whereas most cases slightly exceed the acceptable risk in the exposure duration of 50 or 70 years. In the current design scenarios, there may be low health risks exposed to a benzene-contaminated water to a hypothetical population living in the neighborhood of the landfill.

Health Risk Assessment for a Leachate Plume from a Landfill under Different Hydrogeological Conditions

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