| Title: | Hydrogeochemical and isotopic evaluation of VOC commingled plumes in a weathered fractured bedrock aquifer treated with thermal and bioremediation |
| Author(s): | Hart S; Bertolo RA; Agostini MS; Feig R; Lojkasek-Lima P; Gouvea JCR; Barreto FS; Aravena R; |
| Address: | "CEPAS Groundwater Research Center, University of Sao Paulo, Rua do Lago, 562, 05508-080 Sao Paulo, SP, Brazil. Electronic address: sasha.hart@usp.br. CEPAS Groundwater Research Center, University of Sao Paulo, Rua do Lago, 562, 05508-080 Sao Paulo, SP, Brazil. BASF S.A., Av. Brasil, 791, Building E 250, 12521-140 Guaratingueta, SP, Brazil. BASF SE, Carl-Bosch-Strasse 38, 67056 Ludwigshafen am Rhein, Germany. Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, N2L 3G1 Waterloo, Ontario, Canada" |
| DOI: | 10.1016/j.jconhyd.2021.103940 |
| ISSN/ISBN: | 1873-6009 (Electronic) 0169-7722 (Linking) |
| Abstract: | "Chlorinated ethanes and ethenes isotopic analyses in groundwater and hydrogeochemical results from a former industrial area in Sao Paulo (Brazil) were used to confirm the existence and allow further characterization of source areas and their commingled plumes, both before and after thermal and bioremediation treatments. Prior to full scale remediation, a recently identified off-site source area with unknown history and limited access for further intrusive works presented lower delta(13)C values (-6.5 per thousand to -1.8 per thousand for 1,2-DCA) than the downgradient on-site source area (+8.6 per thousand to +20.0 per thousand). Intermediate delta(13)C values for 1,2-DCA were identified further downgradient from the sources, within commingled plumes patterns. The isotope and concentration results show the typical degradation patterns associated with biotic reductive dechlorination for chlorinated ethenes and dihaloelimination for 1,2-DCA. Results following remediation treatments show further levels of isotopic enrichment, for chlorinated ethenes and chlorinated ethanes in the tropically weathered and deeper fractured bedrock (gneisses) groundwater. Hydrogeochemical results, isotopic mass balance and Carbon-Chlorine isotope slopes data are coherent with remediation treatment and a complex commingled plume setting. The results of this study confirmed the Temporal Conceptual Model proposed by Hart et al. (2021) and identified the need for further studies to evaluate isotopic dynamics under thermal remediation, including thermal-induced hydrolysis processes" |
| Keywords: | "Biodegradation, Environmental Brazil Carbon Isotopes/analysis *Groundwater/chemistry *Volatile Organic Compounds *Water Pollutants, Chemical/analysis Bioremediation Chlorinated ethanes and ethenes Commingled plumes Isotopic fingerprinting Thermal remediat;" |
| Notes: | "MedlineHart, SashaT Bertolo, Reginaldo A Agostini, Maria S Feig, Roland Lojkasek-Lima, Paulo Gouvea, Jose C R Jr Barreto, Fernanda S Aravena, Ramon eng Netherlands 2022/01/10 J Contam Hydrol. 2022 Feb; 245:103940. doi: 10.1016/j.jconhyd.2021.103940. Epub 2022 Jan 4" |
