https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33762 Tue 01 Oct 2019 11:37:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44451 Thu 13 Oct 2022 15:01:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35120 in situ treatment and remediation approaches are limited for low-permeability aquifers materials, particularly because of limitations to the delivery of reactive chemicals or access to contaminated plumes. In this paper, we describe the development of a cutting-edge solution for the remediation of contaminated groundwater in a low-permeability and low water-bearing aquifer contaminated with the chlorinated hydrocarbon trichloroethylene (TCE). The remediation technique introduced coupling of large-diameter permeable reactive barrier wells (PRB wells) with: (1) extraction wells through in a highly impacted plume; and (2) re-injection wells at the fringe of the plume. A pump-and-treat system (PTS) was employed at the site in a separate plume to reduce the mass of TCE near the second source zone. This research focuses only on the large diameter PRB well system. Conceptual site model development, design considerations, implementation and performance evaluation demonstrated how each of these elements were applied in the field. Approaches for coupling technologies to increase technical and economic feasibility are presented. Extraction and reinjection wells of treated groundwater at the fringe of the plume promoted a positive hydraulic gradient, facilitated groundwater transport through the reactive media, and contained the plume. Detailed geospatial and statistical analysis with over 10 years' monitoring data showed that dissolved TCE plume delineation shrank, and still concentration continues to decline, and were projected to meet the demands of remediation compliance regulations in the next few years. The results of this study indicate that significant remediation was achieved despite the challenging hydraulic conditions of the aquifer. The developed the remediation technology and conclusions indicate the system's usefulness at other sites.]]> Thu 11 May 2023 11:46:01 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48315 Thu 08 Feb 2024 10:42:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29720 t), the time required for the TCE vapor to pass through the soil column, and specific volume of retention (V_R), and total volume of TCE retained in soil. Results show TCE vapor retardation is mainly due to the rapid partitioning of the compound to SOM. However, the specific volume of retention of clayey soils with secondary mineral particles was higher. Linear regression analyses of the SOM and clay fraction with V_R show that a unit increase in clay fraction results in higher sorption of TCE (V_R) than the SOM. However, partitioning of TCE vapor was not consistent with the samples' surface areas but was mainly a function of the type of secondary minerals present in soils.]]> Sat 24 Mar 2018 07:33:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26475 -1), to simultaneously determinate multiple petroleum hydrocarbons (PHs) in real mixture samples. This system includes: an object oriented baseline correction; Band decomposition (curve fitting) method with mathematical optimization; and Artificial Neural Network (ANN) for determination, which is suitable for the characteristics of this IR regions, where the spectra are normally with low signal to noise ratio and high density of peaks. BTEX components are potentially lethal carcinogens and contained in many petroleum products. As a case study, six BTEX components were determinate automatically and simultaneously in mixture vapor samples. The robustness of the BTEX determination was validated using real petroleum samples, and the prediction results were compared with gas chromatography-mass spectrometry (GC-MS).]]> Sat 24 Mar 2018 07:27:14 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38651 Mon 29 Jan 2024 17:49:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52529 Mon 16 Oct 2023 10:52:20 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38772 Fri 28 Jan 2022 13:59:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39332 Fri 03 Jun 2022 16:59:24 AEST ]]>