Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6332170 | Science of The Total Environment | 2014 | 11 Pages |
Abstract
The regions of Durham and York in Ontario, Canada have partnered to construct an energy-from-waste (EFW) thermal treatment facility as part of a long term strategy for the management of their municipal solid waste. In this paper we present the results of a comprehensive ecological risk assessment (ERA) for this planned facility, based on baseline sampling and site specific modeling to predict facility-related emissions, which was subsequently accepted by regulatory authorities. Emissions were estimated for both the approved initial operating design capacity of the facility (140,000Â tonnes per year) and the maximum design capacity (400,000Â tonnes per year). In general, calculated ecological hazard quotients (EHQs) and screening ratios (SRs) for receptors did not exceed the benchmark value (1.0). The only exceedances noted were generally due to existing baseline media concentrations, which did not differ from those expected for similar unimpacted sites in Ontario. This suggests that these exceedances reflect conservative assumptions applied in the risk assessment rather than actual potential risk. However, under predicted upset conditions at 400,000Â tonnes per year (i.e., facility start-up, shutdown, and loss of air pollution control), a potential unacceptable risk was estimated for freshwater receptors with respect to benzo(g,h,i)perylene (SRÂ =Â 1.1), which could not be attributed to baseline conditions. Although this slight exceedance reflects a conservative worst-case scenario (upset conditions coinciding with worst-case meteorological conditions), further investigation of potential ecological risk should be performed if this facility is expanded to the maximum operating capacity in the future.
Keywords
TRVEPCNOAELLD50LOAELCOPCHHRAEFWLC50SAREnvironmental risk assessmentEcological risk assessmentHuman health risk assessmentEnvironmental assessmentADDEnergy-from-wasteIncinerationERAMedian lethal concentrationaverage daily doseWaste managementmedian lethal doseConcentration ratioNo observed adverse effect levelSpecies at risk
Related Topics
Life Sciences
Environmental Science
Environmental Chemistry
Authors
Christopher A. Ollson, Melissa L. Whitfield Aslund, Loren D. Knopper, Tereza Dan,