Naslov
Discussion about the feasibility study on remediation of the ETS site in Zadar

Autori
Picer, Mladen ; Hodak Kobasić, Vedranka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Workshop of Croatian-Norwegian project: Mitigation of environmental consequences of the war in Croatia &#8211 ; ; Risk assessment of hazardous chemical contamination, Zagreb, 26-27 September, 2005 / - , 2005

Skup
Workshop of Croatian-Norwegian project: Mitigation of environmental consequences of the war in Croatia &#8211 ; ; Risk assessment of hazardous chemical contamination

Mjesto i datum
Zagreb, Hrvatska, 26.09.2005. - 27.09.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
PCB; remedijacija; Zadar
(PCB; remediation; Zadar)

Sažetak
Results of the analysis of polychlorinated biphenyls in soil from numerous locations (on some locations, on two depths), indicate significant contamination of the investigated area TS 110/35 kV - Zadar. It was reason for thoroughly investigation this site for levels of PCBs in soil samples around damaged capacitor. Because some samples show very high level of PCBs (even over 100 mg/kg) it was concluded to collected surface of the most polluted part of ground to investigate possibilities of remediation. The ability of some plant species to metabolise different organic contaminants of the environment is known, and in addition to attempts to improve the understanding of natural metabolic processes much effort is devoted to find conditions for exploitation of plants in biological remediation. The prerequisite for phytoremediation is the selection of proper species. Plants growing well at contaminated sites have to be tested if they are only resistant, or posses also ability to actively metabolise the contaminant in question. Feasibility study on remediation of the ETS site in Zadar - will comprise of the following activities: a) Pre-selection of appropriate remedial methods b) Evaluation of the pre-selected remedial methods (technical, legislative, financial) and selection of the optimal method Due to concrete situation of soil contaminated by PCBs around ETS Zadar (medium level of PCBs and large volume of soil) besides several number of applicable remediation methods, for this situation it seems that next two will be the best choice and applicable alone or in combination. Phytoremediation is treatment of waste based on ability of certain microorganisms to utilise hydrocarbons present in waste as carbon and energy source for their growth. This process leads to decontamination of pollutants to harmless substances – carbon dioxide and water. In the past, various attempts have been made to alter the microbial composition of the soil. Moreover, considerable effort has been devoted to develop mechanisms to control the soil (micro) biological processes. Currently, a number of novel and powerful strategies are proposed to optimise the microbiota in order to achieve soil clean-up. Nevertheless in practice the most relevant approach is the so-called intrinsic remediation, which often corresponds with minimal intervention. Stabilisation is based on a change of physical and/or chemical properties of waste in consequence of its mixing with additives. Suitable combination of waste properties and type of used stabilisation additives leads to creation of range of physical-chemical bonds (sorption, pozzolana and concrete reaction, micro encapsulation) in treated materials. Stabilised waste can be disposed at a landfill and/or utilised by suitable method (e.g. for reclamation) without the secondary contamination of the environment. For stabilisation are usually used suitable combinations of a few additives, which selection depends on properties of treated waste (composition, type of contamination, pH, granularity, water content) and requested product properties.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA