You searched for +publisher:"University of New South Wales" +contributor:("Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW").
Showing records 1 – 5 of
5 total matches.
No search limiters apply to these results.
University of New South Wales
1.
Ji, Chao.
Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation.
Degree: Chemical Engineering, 2017, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/58253 
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45663/SOURCE02?view=true
► The increasing worldwide contamination of freshwater system with micro-pollutants emerges as a critical environmental problem, which has driven the search for novel mitigation approaches. The…
(more)
▼ The increasing worldwide contamination of freshwater system with micro-pollutants emerges as a critical environmental problem, which has driven the search for novel mitigation approaches. The use of enzymes such as laccase as biocatalyst has been recognised as a promising approach for micro-pollutants removal. However, rapid denaturation of the free enzyme and its difficulty in recycling and reuse restrict its wider application, and efficient enzyme immobilization and bioreactor design are required.In this study, and two membrane bioreactors were proposed for carbamazepine (CBZ) degradation: the hybrid membrane system where laccase-immobilized TiO2 nanoparticles were suspended in the feed solution, and the biocatalytic membrane reactor where laccase was immobilised on TiO2 coated membrane surface. Using p-coumaric acid as a mediator, efficient CBZ removal (up to 71%) was achieved with the hybrid membrane reactor. Functionalized TiO2 nanoparticles were further applied to immobilize crude enzyme extracts from P. ostreatus culture. The resultant biocatalytic particles had comparable performance to the immobilized purified commercial laccase and showed efficient bisphenol-A and CBZ removal in the hybrid reactor.In addition, a cross-linked carbon nanotubes (CNTs) based membrane was prepared, which exhibited high effectiveness as support for physical adsorption of laccase. The active laccase coating on CNTs membrane can be renewed after simple cleaning and re-immobilization. The biocatalytic membrane also showed substantial improvement in micro-pollutant removal compared with the membrane having no enzyme. At last, it is demonstrated that the intramolecular electron transfer within single enzyme molecule is an important alternative pathway which can be harnessed to generate electricity. By decoupling the redox reaction within laccase, efficient electricity production from unconventional fuels including recalcitrant pollutants and/or toxic organic was obtained in a sole-laccase based enzymatic fuel cell. The intramolecular electron-harnessing concept was also demonstrated with other enzymes, including the power generation during CO2 bioconversion to formate catalysed by formate dehydrogenase. The novel enzymatic power generation is shown to be potentially feasible utilizing wastewater as fuel as well as occurring in tandem with driving bioconversion of
chemical feedstock from CO2.
Advisors/Committee Members: Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Micro-pollutant; Laccase; Biocatalytic membrane reactor; Enzymatic fuel cell; Enzyme immobilization
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ji, C. (2017). Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58253 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45663/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Ji, Chao. “Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 16, 2021.
http://handle.unsw.edu.au/1959.4/58253 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45663/SOURCE02?view=true.
MLA Handbook (7th Edition):
Ji, Chao. “Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation.” 2017. Web. 16 Jan 2021.
Vancouver:
Ji C. Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 16].
Available from: http://handle.unsw.edu.au/1959.4/58253 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45663/SOURCE02?view=true.
Council of Science Editors:
Ji C. Laccase-based Biocatalytic Systems for Recalcitrant Micro-Pollutants Degradation and Energy Generation. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58253 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45663/SOURCE02?view=true
University of New South Wales
2.
Zhong, Wenwei.
Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting.
Degree: Chemical Engineering, 2017, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/58868
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47835/SOURCE02?view=true
► Membrane distillation (MD) is an emerging low energy desalination technology, where low-grade heat source can be utilized to provide heat to the feed, offering an…
(more)
▼ Membrane distillation (MD) is an emerging low energy desalination technology, where low-grade heat source can be utilized to provide heat to the feed, offering an alternative solution to saline concentrate treatment. Yet, MD still suffers prominently from scaling, wetting and low flux. To overcome these problems, methods of fouling control are frequently investigated, such as process optimization by selecting the appropriate operational parameters and cleaning protocols, and refining the intrinsic properties of the membrane to meet the needs of membrane distillation, in terms of enhanced fouling/wetting resistance and reduced mass transfer resistance. This dissertation examined the fouling mechanisms in MD process by different substances in treating saline concentrates produced from coal seam gas generation, as well as the desalination of brackish groundwater. In particular, the fouling mechanisms of substances such as alkaline scalants, silica, and humic acids were studied. During the treatment of coal seam gas water with the presence of silica, magnesium formed porous structured depositions with silica, which caused a less severe flux decline as compared to the feed without silica. Initially, the precipitation of calcite was spotted, followed by the deposition of magnesium silicate and sodium chloride. The roles of fouling control via intermittent cleaning, mechanical agitations, as well as an integrated thermal crystallizer were investigated. As such, cleaning of the membrane prior to catastrophic membrane degradation is a critical operating protocol as an approach to the maintenance of membrane performance. It should be noted that the approaches to fouling control should be carefully selected according to the specific fouling mechanism by the pollutants present in the feed. While vigorous agitations might be undesirable in MD process for the treatment of inorganic feed, it was discovered that the application of an integrated thermal crystallizer could help sustain membrane performance and harvest crystals. On the other hand, high speed transverse vibration at 500 rpm was found to be effective in fouling control for the treatment of brackish groundwater concentrates with a considerable amount of humic aicds. This work also explored the effect of surface
engineering on membrane performance for different MD processes. To be specific, two approaches to surface functionalization were investigated as the purpose of different MD applications, namely Janus hydrophobic-hydrophilic membrane and superhydrophobic surface. To fabricate a Janus membrane, a facile solution-immersion method in the dopamine solution was applied. Significant increase of flux measured in a submerged direct contact membrane distillation configuration was observed from the modified membrane by this approach. The thickness of the hydrophilic layer determined the flux values and the rejection rate for long-term operation in saline solution; the trade-off caused by these two parameters should be carefully examined during the design of membrane. The…
Advisors/Committee Members: Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Membrane fouling; Membrane distillation; Hydrophobic material; Desalination; Superhydrophobic; Janus membrane; Concentrate treatment; Brine management; Wetting; Crystallization; Zero liquid discharge; Brackish groundwater; Produced water; Surface engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhong, W. (2017). Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58868 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47835/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Zhong, Wenwei. “Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 16, 2021.
http://handle.unsw.edu.au/1959.4/58868 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47835/SOURCE02?view=true.
MLA Handbook (7th Edition):
Zhong, Wenwei. “Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting.” 2017. Web. 16 Jan 2021.
Vancouver:
Zhong W. Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 16].
Available from: http://handle.unsw.edu.au/1959.4/58868 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47835/SOURCE02?view=true.
Council of Science Editors:
Zhong W. Membrane distillation for the treatment of concentrated saline effluents – mechanism and mitigation of membrane fouling and wetting. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58868 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47835/SOURCE02?view=true
University of New South Wales
3.
Sutrisna, Putu Doddy.
Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation.
Degree: Chemical Engineering, 2017, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/58876
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47873/SOURCE02?view=true
► Polymeric membrane-based gas separation process provides an environmentally attractive alternative to gas absorption and adsorption. However, the permeability/selectivity trade-off, the operational stability under aggressive feed…
(more)
▼ Polymeric membrane-based gas separation process provides an environmentally attractive alternative to gas absorption and adsorption. However, the permeability/selectivity trade-off, the operational stability under aggressive feed gas, and carbon dioxide (CO2)-induced plasticisation behaviour remain key challenges for its application in flue gas and natural gas treatment. Combining polymer and particles inside mixed matrix membranes (MMMs) has a good potential to address these challenges.The first part of this research studied the CO2 permeation behaviour in dense film MMMs and composite hollow fibre membranes incorporating block co-polymer (Pebax-1657) with Metal Organic Frameworks (MOFs) particles, namely Zeolitic Imidazolate Framework (ZIF-7 and -8) and
University of Oslo-66 (UiO-66). The presence of MOFs reduced the polymer flexibility, thus inhibited the increase in CO2 permeability. Membrane plasticisation was not observed in Pebax-based membranes while the selectivity was relatively unchanged. In addition, the hydrogen bonding between MOFs and Pebax improved the membrane’s operational stability under high pressure.Another major challenge in MMMs is to control the microvoids at the interfacial region and improve MOFs loading. In the second section of this study, flexible ZIF and rigid UiO-66 were incorporated in nanocomposite hollow fibre membranes, and (–COOH) and (–NH) modified UiO-66s were applied to investigate the effect of surface functionalization. Up to 80 wt% UiO-66 can be incorporated, and improvements in CO2 permeance and selectivity were obtained with (-NH) functionalized UiO-66. In general, more rigid MOFs are preferred to mitigate defects and improve gas selectivity.In addition, pure ZIF membranes emerge as an attractive material for molecular sieving membrane. ZIF-8 is one of the most studied ZIFs due to its simple fabrication process and use of environmentally friendly solvent. Fabrication of ZIF-8 membrane on inert polymeric surface is still challenging. This research functionalised PVDF hollow fibre support with TiO2-APTES and polydopamine-polyethylenimine to induce ZIF-8’s growth. Both methods could form ZIF-8 membranes with thickness below 1 µm that yielded one of the highest hydrogen permeances achieved by ZIF-8 membranes (> 105 x 10-7 mol m-2 s-1 Pa-1) and H2/CO2 selectivity of 7.5. This accomplishment opens up the pathway to use ZIF-8 as gutter layer in composite membranes.
Advisors/Committee Members: Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Gas separation; Nanocomposite membrane; Metal organic frameworks; Zeolitic imidazolate framework; UiO-66; Plasticisation; Membrane stability
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sutrisna, P. D. (2017). Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58876 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47873/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Sutrisna, Putu Doddy. “Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 16, 2021.
http://handle.unsw.edu.au/1959.4/58876 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47873/SOURCE02?view=true.
MLA Handbook (7th Edition):
Sutrisna, Putu Doddy. “Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation.” 2017. Web. 16 Jan 2021.
Vancouver:
Sutrisna PD. Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 16].
Available from: http://handle.unsw.edu.au/1959.4/58876 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47873/SOURCE02?view=true.
Council of Science Editors:
Sutrisna PD. Improving the performance of nanocomposite membranes by incorporating inorganic fillers for gas separation. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58876 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:47873/SOURCE02?view=true
University of New South Wales
4.
Li, Lin.
Development of pervaporation composite membranes for brine desalination application.
Degree: Chemical Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/60321
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51764/SOURCE02?view=true
► Desalination has become one of the most promising techniques of solving the global freshwater shortage problem. Enormous research effort has been invested to improve desalination…
(more)
▼ Desalination has become one of the most promising techniques of solving the global freshwater shortage problem. Enormous research effort has been invested to improve desalination technology, such as enhancing efficiency, reducing cost and limiting the environmental impact of desalination. One of the major environmental impacts of desalination process is the by-production of a large amount of highly concentrated brine, while the proper management of the brine is still a challenging task for researchers and the society. Treatment of the brine generally aims to further reclaim water and useful salt elements, and it is essentially a desalination process, though the feed contains a much higher concentration of salts and other contaminant contents compared to conventional seawater desalination. So, to suit the needs of brine treatment, not all desalination technologies can be applied, among which membrane distillation and pervaporation seem to have the potential because of their high permeate quality and capability of treating highly concentrated effluent. Membrane distillation has been widely studied, however, the wetting, fouling/scaling issues still limit its wide application. Unlike membrane distillation, the membrane used in pervaporation is dense and hydrophilic, which could effectively overcome the wetting and fouling/scaling issues. This dissertation presents a thorough investigation on pervaporation membranes for brine desalination, with the objective of obtaining high performance pervaporation membranes with both high permeate flux and good salt rejection for long-term operation.In this study, a thin dense layer of polyvinyl alcohol (PVA) was coated on top of the supporting membrane to generate the composite pervaporation membrane. Based on a series of systematic experimental endeavours, how the crosslinking of PVA by glutaraldehyde and incorporation of graphene oxide (GO) nanosheets affected the pervaporation performance has been investigated. By further optimizing the crosslinking structure, membrane fabrication techniques and membrane compositions, the optimized PVA/PVDF composite membranes were further investigated regarding its performance encountering different brines as feed solution: they showed very stable performance for long-term operation with a nearly complete salt rejection (> 99.999 %). More importantly, the composite membranes also exhibited excellent storage stability, anti-fouling/scaling properties and cleaning efficiency.Incorporation of defect engineered fumarate-based MIL-53(Al) metal-organic frameworks (MOFs) in the PVA matrix was further conducted recognizing its porous structure and good compatibility with PVA matrix. By optimizing the MIL-53(Al) porous structure and loadings in the PVA matrix, the obtained nanocomposite membranes showed improved fresh water productivity (up to 75 % improvement) for concentrated brine treatment, without compromising the membranes’ ultrahigh salt rejection, anti-fouling/scaling performance and long-term stability.Finally, a nanocomposite membrane…
Advisors/Committee Members: Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Desalination process; Desalination; Brine desalination application
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, L. (2018). Development of pervaporation composite membranes for brine desalination application. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60321 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51764/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Li, Lin. “Development of pervaporation composite membranes for brine desalination application.” 2018. Doctoral Dissertation, University of New South Wales. Accessed January 16, 2021.
http://handle.unsw.edu.au/1959.4/60321 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51764/SOURCE02?view=true.
MLA Handbook (7th Edition):
Li, Lin. “Development of pervaporation composite membranes for brine desalination application.” 2018. Web. 16 Jan 2021.
Vancouver:
Li L. Development of pervaporation composite membranes for brine desalination application. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Jan 16].
Available from: http://handle.unsw.edu.au/1959.4/60321 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51764/SOURCE02?view=true.
Council of Science Editors:
Li L. Development of pervaporation composite membranes for brine desalination application. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60321 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:51764/SOURCE02?view=true
University of New South Wales
5.
Haghighat, Farahnaz.
Treatment of Distillery Waste Using Membrane Technology.
Degree: Chemical Engineering, 2018, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/60458
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52280/SOURCE02?view=true
► Developing an innovative solution to minimize the environmental impact associated with the discharge of waste from the production of ethanol is required. Performance evaluation of…
(more)
▼ Developing an innovative solution to minimize the environmental impact associated with the discharge of waste from the production of ethanol is required. Performance evaluation of membrane processes and advances in energy and nutrient recovery options can be applied to improve the performance of existing distillery water treatment systems, while to design the next generation of distillery water treatment plants. A range of different membrane technologies have been demonstrated for such purpose, however significant challenges remain in selecting appropriate membrane processes that are capable of providing a good salt transmission for a maximal salt recovery whilst rejecting most organics, meanwhile show low fouling propensities and consume less energy.In this study, a membrane dialysis process for an efficient distillery waste treatment was proposed for the first time, with a focus on optimizing dialysis process for potassium harvesting and organic removal from the waste solution. The mass transfer fundamental in membrane dialysis was also studied. With the optimized operating conditions, this process delivers high potassium transmission as well as high organic rejection. This study examined the potential application of the submerged configuration in terms of overall mass transfer performance by comparing it to the conventional cross-flow configuration for both flat sheet and hollow fiber dialysis membranes. The submerged configuration of dialysis process with the aid of membrane transverse vibration offered a promising alternative hydrodynamic approach to the cross-flow velocity in terms of overall mass transfer performance. Further improvement in the performance of the dialysis process in both configurations was studied by optimizing operating parameters including cross-flow velocity, vibration frequency, dialysate flow rate as well as distance between fibers. The results showed that there is a direct relationship between frequency and cross-flow velocity with the overall mass transfer coefficient of potassium. It was also found that the overall mass transfer coefficient was a function of the packing density of the hollow fibers. There was an optimum packing density in which the maximum mass transfer coefficient occurred. Compare to cross-flow, the water flux in submerged was higher. The theoretical analysis revealed the overall mass transfer is convection-control for a wide range of feed flow rate.
Advisors/Committee Members: Chen, Vicki, Chemical Engineering, Faculty of Engineering, UNSW, Leslie, Gregory, Chemical Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Potassium; Distillery; Dialysis
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Haghighat, F. (2018). Treatment of Distillery Waste Using Membrane Technology. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/60458 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52280/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Haghighat, Farahnaz. “Treatment of Distillery Waste Using Membrane Technology.” 2018. Masters Thesis, University of New South Wales. Accessed January 16, 2021.
http://handle.unsw.edu.au/1959.4/60458 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52280/SOURCE02?view=true.
MLA Handbook (7th Edition):
Haghighat, Farahnaz. “Treatment of Distillery Waste Using Membrane Technology.” 2018. Web. 16 Jan 2021.
Vancouver:
Haghighat F. Treatment of Distillery Waste Using Membrane Technology. [Internet] [Masters thesis]. University of New South Wales; 2018. [cited 2021 Jan 16].
Available from: http://handle.unsw.edu.au/1959.4/60458 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52280/SOURCE02?view=true.
Council of Science Editors:
Haghighat F. Treatment of Distillery Waste Using Membrane Technology. [Masters Thesis]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/60458 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:52280/SOURCE02?view=true
. 
Open Access Theses and Dissertations