https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33382 Wed 15 Mar 2023 10:18:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50270 Wed 12 Jul 2023 13:01:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21220 Wed 11 Apr 2018 17:12:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26286 -1 (range = 1.5-201 µg·L^-1). Fifty three percent groundwater samples showed higher As value than WHO safe limit of 10 µg·L^-1. Speciation of As in groundwater samples (n = 13) showed the presence of inorganic As only; arsenite (As(III)) constituted 13%-67% of total As and arsenate (As(V)) ranged from 33% to 100%. For As health risk assessment, the hazard quotient and cancer risk values were 11-18 and 46-600 times higher than the recommended values of US-EPA (i.e., 1.00 and 10^-6, respectively). In addition to As, various water quality parameters (e.g., electrical conductivity, Na, Ca, Cl¯, NO₃¯, SO₄²¯, Fe, Mn, Pb) also enhanced the health risk. The results show that consumption of As-contaminated groundwater poses an emerging health threat to the communities in the study area, and hence needs urgent remedial and management measures.]]> Wed 11 Apr 2018 15:52:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:11128 Wed 11 Apr 2018 13:12:14 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:10965 Wed 11 Apr 2018 12:21:41 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44026 Wed 05 Oct 2022 15:18:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54047 10 μg/L was much greater in the regions between two major rivers than in the regions close to the Ganges River on the eastern border of the study area, where higher proportions of As concentrations >10 μg/L had been observed prior to 2005. The greater likelihood that toxic concentrations of As are present away from the river channel and is found instead in the interfluvial regions could be attributed to the transport and flushing of aquifer As from intense irrigation pumping. We estimated that about 2.8 million people could be chronically exposed to As concentrations >10 μg/L. This high population-level exposure to elevated As concentrations could be reduced through targeted well-testing campaigns, promoting well-switching, provisions for safe water access, and developing plans for raising public awareness. Policymakers could use the ternary hazard map presented here to target high-risk localities for priority implementation of piped water supply strategies to help reduce human suffering.]]> Tue 30 Jan 2024 13:50:01 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54511 Tue 27 Feb 2024 15:40:05 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44937 Tue 25 Oct 2022 10:36:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47649 90 m (23 μg L−1) depths. Piper-plot elucidated that the aqueous chemistry was dominated with Na-SO4, Na-Ca-SO4, Na-Mg-SO4 type saline water. Principal component analysis grouped As concentration with well depth, pH, salinity, Fe and CO3, exhibiting that these hydrogeochemical factors could have potential role in controlling As release/sequestration into the aquifers of study area. Geochemical modeling showed positive saturation indices only for iron (Fe) oxide-phases, indicating Fe oxides as the major carriers of As. Overall, this study provides insights to tackle emerging As threat to the communities in Punjab, Pakistan, as well as help develop suitable management/mitigation strategies – based on the baseline knowledge of As levels/species and factors governing As contamination in the study area.]]> Tue 24 Jan 2023 14:58:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53284 Tue 21 Nov 2023 10:23:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46340 −1 (Bangladesh drinking water standard) during pre-monsoon, while 11 samples out of 20 were unable to remove As below the WHO provisional guideline value of 10 µg L⁻¹. During post-monsoon, none of the samples exceeded 50 µg L−1, but eight of them exceeded 10 µg L⁻¹. The Fe removal efficiencies of AIRPs were evident in more than 80% samples. Although As removal efficiency was found to be substantial, a cancer risk assessment indicates that hazard quotient (HQ) and carcinogenic risk (CR) of As in treated water for adults and children are above the threshold limits. Thus, additional reductions of As concentrations in treated water are needed to further reduce the excess cancer risk due to As in drinking water. Since 55% and 40% of the AIRPs were unable to remove As < 10 µg L⁻¹ during pre-monsoon and post-monsoon, further improvement including changes in AIRP design, regular cleaning of sludge, and periodic monitoring of water quality are suggested. Future research is needed to determine whether these modifications improve the performance of AIRPs.]]> Tue 15 Nov 2022 15:04:48 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47979 Na+ > K+. It was also observed that at salt concentrations above 100 mM for Na+, above 10 mM for K+ and Mg2+ but between 0.1 and 10 mM for Ca2+ in the presence of greater than 4 ppm of SDS, the cations can complex with the SDS in the system and suppress foam formation due to the surfactant precipitation. Foam fractionation was able to remove perfluorohexane sulphonic acid (PFHxS), perfluorooctanoic acid (PFOA) and perfluorooctane sulphonic acid (PFOS) from a sample of Australian groundwater to below the analytical detection limit of 0.1 ppb within 60 min with SDS being used as the co-foaming agent, but was unable to remove the short chain perfluorobutanoic acid (PFBA).]]> Tue 14 Feb 2023 11:49:18 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34990 Tue 03 Sep 2019 18:01:47 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50558 Tue 01 Aug 2023 10:33:02 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24911 Thu 14 Apr 2022 11:05:18 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34818 Thu 14 Apr 2022 11:00:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24840 Thu 14 Apr 2022 10:59:28 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23232 . 1 for As in drinking water, vegetables and rice, for Mn in drinking water, vegetables, rice and wheat, for Pb in rice and wheat indicated the potential health risk to the local population. An assessment of As and other elements of other food components should be conducted to understand the actual health hazards caused by ingestion of food in people residing in the middle Gangetic plain.]]> Thu 14 Apr 2022 10:59:04 AEST ]]> 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:42485 p = .006), whereas no significant differences were found between the means of the two groups using the standard L/N ratio (p = .063). The modified L/N ratios also showed a statistically significant difference between the means of the bores impacted by municipal waste versus those impacted by non-putrescible waste (p = .003), indicating they are a much more sensitive indicator of both the existence and type of landfill leachate impact on groundwater than previously reported. This new index may prove particularly useful in complex urban areas where multiple potential contamination sources exist, and land use histories are either unknown or complicated. Capsule: Conventional methods for leachate detection in groundwater surrounding legacy landfills have been analysed and further developed via the inclusion of perfluoroalkyl acids, to better understand contaminant sources, fate and transport.]]> Thu 08 Feb 2024 10:42:49 AEDT ]]> 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:54648 Thu 07 Mar 2024 15:27:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:8960 Sat 24 Mar 2018 08:37:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:2947 Sat 24 Mar 2018 08:29:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:2865 Sat 24 Mar 2018 08:28:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:12271 Sat 24 Mar 2018 08:10:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:12015 Sat 24 Mar 2018 08:09:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20563 Sat 24 Mar 2018 08:02:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:16839 (g) to CO₂_(aq) could not keep up with the consumption of CO₂_(aq), resulting in an initial disequilibrium with experimental pH reaching equilibrium quickly, while fluoride removal lagged. Increasing stirring rate significantly decreased the extent of disequilibrium and the time at which the CaCO₃ -fluoride-CO₂ system attained equilibrium due to the increased rate of transport of dissolved CO₂ to the CaCO₃ surface, and simultaneously the rate of transport of the dissolved CaCO₃ to the bulk solution. Optimal fluoride removal occurs at pCO₂ ~10-0.52 [30% (mol% CO₂)] with 96% of the initial 2,000 mg/L fluoride load removed in less than 80 min with a stirring rate of 300 revolutions per minute. Increasing pCO₂ to ~100 (100% CO₂) resulted in very little gain, less than 2%, in fluoride removal, or in the time required to reach equilibrium and therefore significant remediation cost savings can be obtained by using pCO₂ 30% when compared to 100%.]]> Sat 24 Mar 2018 07:53:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6168 Sat 24 Mar 2018 07:44:38 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29268 Sat 24 Mar 2018 07:39:17 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29775 80%) samples found above BIS and WHO permissible limit, while 28% samples exceeded the previous WHO drinking water guideline (400 µg/L) for manganese (Mn). In dietary food grains As followed the sequence as rice > wheat > maize. The estimated daily intake by individual of As, Mn, Ni, Cd, Co, Pb, Zn and Cr from drinking water and dietary food grains were 169,14582, 474, 19, 26, 1449, 12955 and 882 µg/ kg. The Health Risk Index (HRI) were >1 for As in drinking water, vegetables and rice indicated the potential health risk to the residents of the study area. However, HRI <1 for wheat and maize indicate a relative absence of health risks associated with their ingestion.]]> Sat 24 Mar 2018 07:30:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50772 Sat 05 Aug 2023 09:37:39 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51969 Mon 25 Sep 2023 10:24:10 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32388 Mon 23 Sep 2019 13:21:58 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32889 Mon 23 Sep 2019 12:24:56 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36645 Mon 22 Jun 2020 13:44:46 AEST ]]> 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:42848 Mon 05 Sep 2022 15:12:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54105 Mon 05 Feb 2024 09:57:42 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51936 Fri 22 Sep 2023 12:38:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48976 Fri 21 Apr 2023 09:22:46 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54848 Fri 15 Mar 2024 17:08:02 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53605 Fri 08 Dec 2023 16:08:54 AEDT ]]>