Loading...
Please wait, while we are loading the content...
Similar Documents
Influence des mélanges complexes organiques sur le sort des dioxines et furanes : implications dans le développement de facteurs de caractérisation en analyse du cycle de vie
| Content Provider | Semantic Scholar |
|---|---|
| Author | Taing, Éric |
| Copyright Year | 2014 |
| Abstract | The environmental fate of dioxins and furans, or polychlorodibenzo-p-dioxins and -furans (PCDD/Fs), leaching from wood poles treated with pentachlorophenol (PCP) oil is modified by the presence of oil. Interactions between co-contaminants, which also exist for other pollutants within the mixtures, were shown in the specific context of risk analysis, but have never been taken into account for the generic context of life cycle assessment (LCA). This decision-making tool relies on characterization factors (CF) to estimate the potential impacts of an emitted amount of a pollutant in different impact categories such as aquatic ecotoxicity and human toxicity. For these two impact categories, CFs are calculated from a cause-effect chain that models the environmental fate, exposure and effects of the pollutant (represented by a matrix of fate FF, exposure XF and effect EF, respectively), meaning that a modification of PCDD/Fs fate induces a change in PCDD/Fs CFs. The research question is therefore as follows: In life cycle impact assessment (LCIA), to what extent would the potential impacts of PCDD/Fs on aquatic ecotoxicity and human toxicity change when taking into account the influence of a complex organic mixture on PCDD/Fs fate? Thus, the main objective is to develop CFs of PCDD/Fs when their fate is influenced by PCP oil and compare them with the CFs of PCDD/Fs without oil for the aquatic ecotoxicity and human toxicity impact categories. A mathematic approach is established to determine the new environmental distribution of PCDD/Fs in the presence of oil and a new FF’ matrix is calculated from this new distribution to obtain new CFs’ integrating oil influence. FF’ and CF’ are then compared to FF and CF of PCDD/Fs without the oil. Finally, potential (eco)toxic impacts of the PCDD/F Canadian emissions are calculated with the new CFs’ of PCDD/Fs in presence of oil. First, 2,3,7,8-TCDD is selected as a proxy to represent the PCDD/Fs contained in the PCP, and 17 organic fractions from the literature are chosen to represent the oil. The approach is based on a literature review that indicated that, due to their strong affinity for oil, PCDD/Fs are carried by the oil until oil degradation in the soil. The carrier behaviour of the oil is extrapolated to all environmental compartments. The approach is divided into two steps: in the first step, 2,3,7,8TCDD follows exactly the oil distribution, and a fraction of 2,3,7,8-TCDD is eliminated with the oil, and in the second step, the fraction of non-eliminated 2,3,7,8-TCDD redistributes in the environment without the oil before being eliminated ultimately. The USEtox multimedia model is |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://publications.polymtl.ca/1399/1/2014_EricTaing.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
