Papers by Keyword: TCE

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Authors: Xue Qiang Zhu, Bao Ping Han, Guo Jun Wu, Xiao Qing Zhang
Abstract: The effects of individual inorganic anions (nitrate and chloride) on the reactivity of granular iron were investigated using plexiglass columns packed with granular iron. The results show that TCE removal decreases apparently with increasing nitrate concentration due to competition for reactive sites. Chloride exhibits dual-effect on the TCE removal by Fe0. In the studied condition, the TCE dechlorination is enhanced at the low chloride concentration due to pitting corrosion and is dampened at the high chloride concentrations such as 59.98 and 110.45 mg/L as Cl-.
Authors: Jun Hui Li, Shan Shan Dong, Ho Jae Shim
Abstract: An indigenous Pseudomonas sp., isolated from the heavily petroleum-contaminated soil and identified as Pseudomonas plecoglossicida, was evaluated for its aerobic cometabolic removal of mixture of two representative chlorinated aliphatic hydrocarbons (CAHs), cis-1,2-dichloroethylene (cis-DCE) and trichloroethylene (TCE), with BTEX/toluene provided as substrate in a laboratory-scale soil slurry. The aerobic simultaneous bioremoval of the cis-DCE/TCE/BTEX mixture was studied under different conditions. Results showed that the increased BTEX concentration from 400 to 600 mg/kg prolonged the bioremoval of BTEX. The cometabolism of cis-DCE and TCE was significantly greater when toluene was provided as growth substrate compared to the BTEX mixture as substrates. Additionally, the bioremoval of toluene in the treatment with toluene as sole growth substrate was higher compared to the treatment with BTEX mixture as substrate. Results would enhance the applicability of bioremediation technology to the mixed wastes-contaminated sites.
Authors: Tong Zhou Liu, Pin Hua Rao
Abstract: An investigation on the effects of humic acid (representing NOM) on TCE (a typical organic contaminant) removal by Fe0 in batch settings was carried out. Inhibitory effects of humic acid on Fe0 towards TCE removal were observed. At early stage of the experiments, humic acid might partition with TCE, and the adsorption or deposition of humic acid onto Fe0 surface would further facilitated TCE immobilization. Once the reduction reactive sites on Fe0 surfaces were covered by accumulated humic acid and the partition of TCE to humic acid became saturated, TCE removal in Fe0 was observed retarded.
Authors: Wei Hsiang Huang, Yih Terng Sheu, Po Jen Lien, Yu Sung Hsiao, Chih Ming Kao
Abstract: A trichloroethene (TCE) plume has been discovered inside an industrial park located in Taiwan. The objectives of this study were to characterize the solvent spill site and prepare a corrective action plan (CAP) for site remediation. The following tasks have been performed under Taiwan Soil and Groundwater Remediation Act corrective action: (1) geophysical survey to verify the existence and fate of all potential contaminant sources in the vicinity of the avionics repair shop; (2) soil-gas survey and soil/groundwater analyses to delineate the lateral and vertical extent of contaminants in the subsurface; (3) application of field screening techniques to determine the presence of dense, non-aqueous-phase liquids (DNAPLs); (4) contaminant transport modeling; (5) evaluation of the remedial options, conduction of cost analysis, and selection of the optimal treatment system. Results from the site characterization indicate that an extended TCE plume existed in site groundwater, which needs to be contained and remediated. A two-phase remedial approach has been developed. Phase I was to contain the existing dissolved groundwater plume in the surficial aquifer and initiate mass removal of DNAPLs. Phase II was to conduct feasibility studies and possibly test surfactant washing and biobarrier techniques.
Authors: Jun Jie Yue, Xiao Qiao Zhu, Yu Ting Wang, Yu Qin Zhang, Li Zhao, Zhao Hong Shi
Abstract: In situ chemical oxidation with persulfate (PS) anion (S2O82-) is a viable technique for remediation of groundwater contaminants such as trichloroethylene (TCE). This laboratory study investigated the use of the oxidant sodium PS for the chemical oxidation of TCE at different conditions to determine the influence of temperature, pH, and the PS/TCE molar ratio. Experiments revealed that higher temperatures, lower pH, and higher PS/TCE molar ratios were to the benefit of TCE oxidation by PS. By investigating the reaction kinetics, the degradations of contaminant can be described by use of pseudo-first-order reaction. At the temperatures ranging from 25°C to 40°C, the activation energy for the degradation of TCE was determined to be 85.04 KJ/mol.
Authors: Da Song He, Cun Ping Liu, Yong Fu Yuan, Xiu Ying Li
Abstract: The removal of trichloroethylene (TCE) from water using activated carbon fibers (ACF) and activated carbon (AC) was investigated. Adsorption, as an efficient process to remove TCE from water was chosen; in particular with ACF and AC as adsorbents. The results showed that physisorption play important roles for adsorption of TCE onto activated carbon fibers, while the less important chemisorption. Langmuir and Freundlich models were then employed to correlate the equilibria data. The Langmuir model best described the AC adsorption isotherm of TCE, with R2 0.9942. Freundlich model best fitted the ACF adsorption isotherm of TCE, with R2 0.9978.
Authors: Yong Long, Sen Mao Xia, Yu Xiong, Xi Liang
Abstract: Although e-commerce is prevailing, not all products are suitable for it. Most of extant ways of measuring the adaptability of a product are too complex or unconvincing. Based on transaction cost economics (TCE), this paper finds that a product is adaptable to e-commerce if its degree of both perception and price transparency are high. The two dimensions can help companies judge whether their products suit e-commerce or how to make their products become more suitable for e-commerce.
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