HCH isomers change in Pyrenean freshwater ecosystems triggered by the transfer operation of Bailín landfill: The case of Sabocos tarn

• Published in: The Science of the total environment Vol. 787; p. 147655
• Main Authors: Pardo, Alfonso, Rodríguez-Casals, Carlos, Santolaria, Zoe, Arruebo, Tomás, Urieta, José Santiago, Lanaja, Francisco Javier
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.09.2021
• Subjects: Airborne transport; Bailín landfill; Environmental remediation; HCH; Lindane; Sabocos tarn; Environmental remediation; Bailín landfill; HCH; Sabocos tarn; Lindane; Airborne transport
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2021.147655

This study reports major hexachlorocyclohexane (HCH) isomers percentage changes in Sabacos tarn water mass, a glacial lake located in the Spanish Pyrenees. This chief fluctuation is due to the transference of 180,000 m3 of soil and debris containing 30,000 to 80,000 t of HCH solid waste from the original unlined landfill to a secure cell in 2014, both located in Bailín (Huesca, Spain), at a distance of 24.50 km from Sabocos. A strong shift of HCH isomers percentages in the water body of Sabocos was recorded in water samples encompassing a timespan before, during and after the transfer operation, together with a significant net increase of the total isomers content. Lindane (γ-HCH) was the most abundant isomer in Sabocos water before the Bailín transfer operation, whereas α-HCH isomer recorded highest values after the waste relocation. These results suggest the relevance of local airborne transport, even to areas located in non-prevalent wind directions favored by thermal and topographically induced breeze regimes as in the case of Bailín and Sabocos tarn. Thus, a better understanding of local airborne spreading mechanisms is essential to prevent future pollution episodes and for the design and management of remediation operations in areas affected by HCH worldwide, or other waste products of comparable characteristics. [Display omitted] •Sabocos recorded γ-HCH (lindane) maximum before Bailín dumpsite transfer operation.•After Bailín's HCH waste transfer HCH isomers content increased in Sabocos water.•Sabocos changed to a technical HCH waste signal after Bailín dumpsite transfer.•Even in non-prevailing wind directions HCH can reach high mountain ecosystems.•Daytime mountain breezes in the Tena Valley favors airborne transport of POPs.