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BOGDEVICH, Oleg; CADOCHNIKOV, Oleg; CULÎGHIN, Elena; NICOLAU, Elena; GRIGORAŞ, Marina. Study of POPs contaminated site for environmental risk assessment and remediation in Moldova. In: Ecological and environmental chemistry 2017The 6th International Conference. 6th, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, p. 151.
|Ecological and environmental chemistry 2017
Conferința "Ecological and environmental chemistry 2017" |
6th, Chișinău, Moldova, 2-3 martie 2017
POPs polluted site at pesticide storages is an important issue for Republic of Moldova. The inventory of POPs polluted sites was made in 2009 – 2010 years for the determination of needed management and remediation actions. The aim of this study is a review of Environmental Risk Assessment (ERA) methodologies on regional (ranking system) and local level (conceptual model) for individual sites. The case study in Republic of Moldova included three principal factors: first – level and pollution spectrum; second – risk receptors; third – distribution potential. The pollution spectrum was complex and consists of five groups of POPs (DDTs, HCHs, Toxaphene, Chlordane, Heptachlor) and other toxic substances (trifluraline, triazines, PAHs, heavy metals). The value of pollution risk coefficient was calculated after the determination of number of toxic substances. Risk receptors include two factors: distance of risk receptors to polluted site; importance and vulnerability of every receptor. GIS approach was used for the determination of spatial distribution of polluted sites and risk receptors. Risk index for distribution potential included particularities of site for the distribution of toxic substances to the environment and several ways of dispersing pollution in the environment: wind dispersion; infiltration to groundwater; surface runoff; dispersion by animals and anthropogenic factor. The calculation of risk value is considered balance between factors to increase or decrease of pollution potential. The environmental risk assessment on local level should to formulate “conceptual model” of the pollution fate to risk receptors. This procedure has following key steps: 1 – hazard identification; 2 – consequences identification in the case when the hazard occurred; 3 - estimating the magnitude of the consequences (spatial and temporary); 4 - estimation of the consequence probability or the exposure assessment; 5 – the evaluation of risk importance (risk characteristic or assessment). The risk management can be realized by several modes: the reduction or modification of pollution sources; managing or elimination of migration pathways; receptor modification. The possible remediation project should to be developed individually for every polluted site to take into consideration a polluted area, volume of contaminated soil, presence of construction remains, geological conditions, and pollution spectrum. Several sites with different conditions were investigated for ERA procedure on the local level.
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