Compound Specific Isotope Analysis ((13)C, (37)Cl,( 2)H) to trace induced attenuation of chlorinated organic contaminants in groundwater

摘要: Chloroform (CF), tetrachloroethene (PCE) and trichloroethene (TCE) are dense chloro-aliphatic hydrocarbons (CAH) extensively used as industrial solvents. These compounds have been largely released to the environment due poor waste management. In this thesis, effect of a ZVI-PRB installed at field site contaminated mainly with PCE, TCE cis-DCE was evaluated. Moreover, novel strategy degrade recalcitrant CF -alkaline hydrolysis induced by concrete-based recycled construction wastes- proposed developed in order test its efficiency degrading pollutant. Compound specific isotope analysis (CSIA) is valuable tool for monitoring an environmental treatment field, based on fractionation element during transformation reactions. Therefore, general aim thesis use compound 13C, 37Cl 2H assess both attenuation processes 1) chlorinated ethenes degradation sited; and, 2) new remediation technique wastes chloroform (CF) alkaline applied First, laboratory experiments were conducted study ZVI concrete effects chloroform, respectively. yielded carbon values application, well as, first chlorine associated reaction. Two promising approaches discriminate abiotic versus biotic present brought forward dual C-Cl approach, which distinguished slopes 4 times lower than biodegradation commercially available Dehalococcoides-containing culture mixed KB-1; product-specific that showed 10‰ difference between those products coming from ?-dichloroelimination hydrogenolysis Concrete achieved 95% after 28 d, accompanied significant fractionation. The isotopic -53±3‰. obtained data permitted assessment respective treatments site. At treatment, both, occurrence evidenced means detected metabolites 13C data, quantitative estimates less 10% 2% PCE cis-DCE, Dual 13C-37Cl plots confirmed masked biodegradation. Based isotopes 49% almost 100% TCE, respectively, estimated be removed Finally combination discriminated two different sources contamination spilled same industry. This indicates potential ?2H if origin, or whether it formed daughter product degradation. Regarding hydrolysis, field-scale pilot concrete-base induce hydrolysis. lab scale allowed calculation percentage where conditions recharge water interception trenches filled wastes. A maximum approximately 30-40% achieved. Although further research required, groundwater through proposed. would also imply recycling demolition value-added applications increase economic benefits.