https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45154 Wed 26 Oct 2022 19:15:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37472 Wed 13 Jan 2021 17:14:46 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:6885 Wed 11 Apr 2018 17:04:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37953 VI and As^V from water in mono- and binary-adsorbate systems. The adsorption kinetics and isotherm data for Se^VI and As^V were adequately described by the pseudo-second-order (PSO) (r²>0.94) and Freundlich (r²>0.93) equations. Results from scanning electron microscopy showed that the dimension of the NZVI immobilized on the Mt was smaller than pure NZVI. Using 0.05 g of adsorbent and an initial 200 mg L⁻¹ As^V and Se^VI concentration, the maximum adsorption capacity (q_max and partition coefficient (PC) for As^V on NZVI-Mt in monocomponent system were 54.75 mg g^-1 and 0.065 mg g^-1·μM^-1, which dropped respectively to 49.91 mg g^-1 and 0.055 mg g^-1·μM^-1 under competitive system. For Se^VI adsorption on NZVI-Mt in monocomponent system, q_max and PC were 28.63 mg g^-1 and 0.024 mg g^-1·μM^-1, respectively. Values of q_max and PC were higher for NZVI-Mt than NZVI and montmorillonite, indicating that the nanocomposite contained greater adsorption sites for removing both oxyanions, but with a marked preference for As^V. Future research should evaluate the effect of different operational variables on the removal efficiency of both oxyanions by NZVI-Mt.]]> Wed 06 Dec 2023 09:51:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35275 Tue 21 Mar 2023 15:56:55 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:46266 Tue 15 Nov 2022 08:07:28 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 02 Jul 2024 14:29:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41386 Tue 02 Aug 2022 15:55:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54279 LDPE > PP > PA. Further analysis indicated that the electrocoagulation treatment affected microplastic polymers physically, viz. flaking and changed surface conditions, as well as chemically, viz. changes in vibrational energies of C–O–C stretching bonds, C=O stretching bonds, C–H stretching bonds and formation of reactive oxygen species (ROS). Our findings indicate that whilst seemingly effective, electrocoagulation treatment induces changes to microplastic polymers that could beneficially lead to degradation, and/or further fragmentation or breakdown and thereby potentially generating more bioavailable toxic nanoplastic byproducts.]]> Thu 15 Feb 2024 14:47:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7992 Sat 24 Mar 2018 10:45:22 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6226 Sat 24 Mar 2018 07:44:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45348 Mon 29 Jan 2024 18:32:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34738 0.96). The As(V) removal capacity was higher using Z-nZVI than nZVI both in the single and multi-component systems, suffering minimal differences in removal in both cases. The results suggested that Z-nZVI had more specific surface sites for As(V) than nZVI and zeolite, which makes Z-nZVI a more effective adsorbent than nZVI for the removal of As(V) from aqueous solutions in the presence of other oxyanions.]]> Mon 15 May 2023 10:14:02 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25582 E. coli and 1.67 for total coliforms, and the highest concentration of indicator bacteria in treated water samples were found during the monsoon season. Analysis of variance revealed significant differences in the microbial load of indicator organisms (coliforms and E. coli) between seasons, storage time since treatment (TST), and samples with and without chlorine residuals. Findings indicate that the bacteriological quality of drinking water treated in the home is determined by a complex interaction of environmental and sociological conditions. Moreover, while the effect of disinfection was independent of season, the impact of storage TST on water quality was found to be seasonally dependent.]]> Fri 22 Apr 2022 10:21:56 AEST ]]>