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Full-Text Articles in Social and Behavioral Sciences
Osmotic Versus Conventional Membrane Bioreactors Integrated With Reverse Osmosis For Water Reuse: Biological Stability, Membrane Fouling, And Contaminant Removal, Wenhai Luo, Hop Phan, Ming Xie, Faisal I. Hai, William E. Price, Menachem Elimelech, Long D. Nghiem
Osmotic Versus Conventional Membrane Bioreactors Integrated With Reverse Osmosis For Water Reuse: Biological Stability, Membrane Fouling, And Contaminant Removal, Wenhai Luo, Hop Phan, Ming Xie, Faisal I. Hai, William E. Price, Menachem Elimelech, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study systematically compares the performance of osmotic membrane bioreactor - reverse osmosis (OMBR-RO) and conventional membrane bioreactor - reverse osmosis (MBR-RO) for advanced wastewater treatment and water reuse. Both systems achieved effective removal of bulk organic matter and nutrients, and almost complete removal of all 31 trace organic contaminants investigated. They both could produce high quality water suitable for recycling applications. During OMBR-RO operation, salinity build-up in the bioreactor reduced the water flux and negatively impacted the system biological treatment by altering biomass characteristics and microbial community structure. In addition, the elevated salinity also increased soluble microbial products and …
Factors Governing Mass Transfer During Membrane Electrodialysis Regeneration Of Licl Solution For Liquid Desiccant Dehumidification Systems, Ali Hussein Al-Jubainawi, Zhenjun Ma, Yi Guo, Long D. Nghiem, Paul Cooper, Weihua Li
Factors Governing Mass Transfer During Membrane Electrodialysis Regeneration Of Licl Solution For Liquid Desiccant Dehumidification Systems, Ali Hussein Al-Jubainawi, Zhenjun Ma, Yi Guo, Long D. Nghiem, Paul Cooper, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigates the mass transfer mechanisms and the performance of membrane electrodialysis (ED) for regenerating lithium chloride (LiCl) solution commonly used in liquid desiccant dehumidification systems. Experiments were conducted using an ED experimental system while numerical simulation was performed using COMSOL Multiphysics. The results showed that the water flux transfer due to osmosis and electro-osmosis during ED regeneration of LiCl liquid desiccant was significant and could not be ignored. The water flux due to osmosis and electro-osmosis is directly associated with the osmotic gradient and the applied current between the cathode and anode, respectively. The average flux of water …
Effects Of Salinity Build-Up On The Performance Of An Anaerobic Membrane Bioreactor Regarding Basic Water Quality Parameters And Removal Of Trace Organic Contaminants, Xiaoye Song, James A. Mcdonald, William E. Price, Stuart J. Khan, Faisal I. Hai, Hao H. Ngo, Wenshan Guo, Long D. Nghiem
Effects Of Salinity Build-Up On The Performance Of An Anaerobic Membrane Bioreactor Regarding Basic Water Quality Parameters And Removal Of Trace Organic Contaminants, Xiaoye Song, James A. Mcdonald, William E. Price, Stuart J. Khan, Faisal I. Hai, Hao H. Ngo, Wenshan Guo, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The effects of elevated inorganic salt concentration on anaerobic membrane bioreactor (AnMBR) treatment regarding basic biological performance and trace organic contaminant (TrOC) removal were investigated. A set of 33 TrOCs were selected to represent pharmaceuticals, steroids, and pesticides in municipal wastewater. Results show potential adverse effects of increase in the bioreactor salinity to 15 g/L (as NaCl) on the performance of AnMBR with respect to chemical oxygen demand removal, biogas production, and the removal of most hydrophilic TrOCs. Furthermore, a decrease in biomass production was observed as salinity in the bioreactor increased. The removal of most hydrophobic TrOCs was high …
Evaluating Energy Consumption Of Air Gap Membrane Distillation For Seawater Desalination At Pilot Scale Level, Hung Duong, Paul Cooper, Bart Nelemans, Tzahi Y. Cath, Long D. Nghiem
Evaluating Energy Consumption Of Air Gap Membrane Distillation For Seawater Desalination At Pilot Scale Level, Hung Duong, Paul Cooper, Bart Nelemans, Tzahi Y. Cath, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study aimed to optimise an air gap membrane distillation (AGMD) system for seawater desalination with respect to distillate production as well as thermal and electrical energy consumption. Pilot evaluation data shows a notable influence of evaporator inlet temperature and water circulation rate on process performance. An increase in both distillate production rate and energy efficiency could be obtained by increasing the evaporator inlet temperature. On the other hand, there was a trade-off between the distillate production rate and energy efficiency when the water circulation rate varied. Increasing the water circulation rate resulted in an improvement in the distillate production …
Biological Performance And Trace Organic Contaminant Removal By A Side-Stream Ceramic Nanofiltration Membrane Bioreactor, Hop Phan, James A. Mcdonald, Faisal I. Hai, William E. Price, Stuart J. Khan, Takahiro Fujioka, Long D. Nghiem
Biological Performance And Trace Organic Contaminant Removal By A Side-Stream Ceramic Nanofiltration Membrane Bioreactor, Hop Phan, James A. Mcdonald, Faisal I. Hai, William E. Price, Stuart J. Khan, Takahiro Fujioka, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study evaluated the performance of a side-stream ceramic nanofiltration membrane bioreactor (NF-MBR) system with respect to basic water quality parameters as well as trace organic contaminant (TrOC) removal efficiency. The results show a stable biological performance of the continuous NF-MBR system with high effluent quality (total organic carbon < 4 mg L-1 and NH4 +-N below the detection limit). Significantly higher performance by this NF-MBR in comparison to the conventional microfiltration/ultrafiltration MBR regarding the removal of a large number of TrOCs was observed. TrOC removal efficiency depended on their hydrophobicity and molecular features. All hydrophobic compounds (LogD pH=6 > 3) were well removed (>85%), except diazinon (59 ± 7%). Hydrophilic compounds containing electron donating groups were also well removed (>90%). By contrast, hydrophilic compounds containing electron withdrawing groups were poorly removed (8-54%). Most of the 40 TrOCs investigated in this study did not accumulate in the sludge. Only …
Evaluating Ionic Organic Draw Solutes In Osmotic Membrane Bioreactors For Water Reuse, Wenhai Luo, Faisal I. Hai, William E. Price, Menachem Elimelech, Long D. Nghiem
Evaluating Ionic Organic Draw Solutes In Osmotic Membrane Bioreactors For Water Reuse, Wenhai Luo, Faisal I. Hai, William E. Price, Menachem Elimelech, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The performance of two ionic organic draw solutes, namely sodium acetate (NaOAc) and ethylene-diamine-tetra acetic acid disodium salt (EDTA-2Na), during osmotic membrane bioreactor (OMBR) operation was investigated in this study. Their performance was compared to that of sodium chloride (NaCl). A reverse osmosis (RO) process was integrated with OMBR to form an OMBR-RO hybrid system for draw solute recovery and clean water production. Results show that the NaOAc and EDTA-2Na draw solutes significantly reduced salinity build-up in the bioreactor in comparison with NaCl during OMBR operation. At the same osmotic pressure, these two ionic organic draw solutions produced slightly lower …
Graphene/Pvdf Flat-Sheet Membrane For The Treatment Of Ro Brine From Coal Seam Gas Produced Water By Air Gap Membrane Distillation, Yun Chul Woo, Youngjin Kim, Wang-Geun Shim, Leonard D. Tijing, Minwei Yao, Long D. Nghiem, June-Seok Choi, Seung-Hyun Kim, Ho Kyong Shon
Graphene/Pvdf Flat-Sheet Membrane For The Treatment Of Ro Brine From Coal Seam Gas Produced Water By Air Gap Membrane Distillation, Yun Chul Woo, Youngjin Kim, Wang-Geun Shim, Leonard D. Tijing, Minwei Yao, Long D. Nghiem, June-Seok Choi, Seung-Hyun Kim, Ho Kyong Shon
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Membrane Distillation And Membrane Electrolysis Of Coal Seam Gas Reverse Osmosis Brine For Clean Water Extraction And Naoh Production, Hung Duong, Mikel C. Duke, Stephen Gray, Bart Nelemans, Long D. Nghiem
Membrane Distillation And Membrane Electrolysis Of Coal Seam Gas Reverse Osmosis Brine For Clean Water Extraction And Naoh Production, Hung Duong, Mikel C. Duke, Stephen Gray, Bart Nelemans, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Membrane distillation (MD) and membrane electrolysis (ME) were evaluated for simultaneous fresh water extraction and NaOH production from a mixture of NaCl and NaHCO3 to simulate the composition of coal seam gas (CSG) reverse osmosis (RO) brine. Experimental results demonstrate the potential of MD for producing fresh water and simultaneously concentrating CSG RO brine prior to the ME process. MD water flux was slightly reduced by the increased feed salinity and the decomposition of bicarbonate to CO2 during the concentration of CSG RO brine. MD operation of CSG RO brine at a concentration factor of 10 (90% water recovery) was …
Continuous Biotransformation Of Bisphenol A And Diclofenac By Laccase In An Enzymatic Membrane Reactor, Ngoc Luong Nguyen, Faisal I. Hai, William Price, Frederic Leusch, Felicity Roddick, Ewan J. Mcadam, Saleh Faraj Magram, Long D. Nghiem
Continuous Biotransformation Of Bisphenol A And Diclofenac By Laccase In An Enzymatic Membrane Reactor, Ngoc Luong Nguyen, Faisal I. Hai, William Price, Frederic Leusch, Felicity Roddick, Ewan J. Mcadam, Saleh Faraj Magram, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
A novel enzymatic membrane reactor (EMR) was explored for continuous removal of two trace organic contaminatnts (TrOCs) ubiquitously detected in wastewater - namely bisphenol A (BPA and diclofnac (DCF) - by a commercially available laccase from aspergillus oryzae.
High Retention Membrane Bioreactors: Challenges And Opportunities, Wenhai Luo, Faisal Ibney Hai, William Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long Nghiem
High Retention Membrane Bioreactors: Challenges And Opportunities, Wenhai Luo, Faisal Ibney Hai, William Price, Wenshan Guo, Hao H. Ngo, Kazuo Yamamoto, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
Extensive research has focussed on the development of novel high retention membrane bioreactor (HR-MBR) systems for wastewater reclamation in recent years. HR-MBR integrates high rejection membrane separation with conventional biological treatment in a single step. High rejection membrane separation processes currently used in HR-MBR applications include nanofiltration, forward osmosis, and membrane distillation. In these HR-MBR systems, organic contaminants can be effectively retained, prolonging their retention time in the bioreactor and thus enhancing their biodegradation. Therefore, HR-MBR can offer a reliable and elegant solution to produce high quality effluent. However, there are several technological challenges associated with the development of HR-MBR, …
Removal Of Trace Organic Chemicals And Performance Of A Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor, Ryan W. Holloway, Julia Regnery, Long D. Nghiem, Tzahi Cath
Removal Of Trace Organic Chemicals And Performance Of A Novel Hybrid Ultrafiltration-Osmotic Membrane Bioreactor, Ryan W. Holloway, Julia Regnery, Long D. Nghiem, Tzahi Cath
Faculty of Engineering and Information Sciences - Papers: Part A
A hybrid ultrafiltration-osmotic membrane bioreactor (UFO-MBR) was investigated for over 35 days for nutrient and trace organic chemical (TOrC) removal from municipal wastewater. The UFO-MBR system uses both ultrafiltration (UF) and forward osmosis (FO) membranes in parallel to simultaneously extract clean water from an activated sludge reactor for nonpotable (or environmental discharge) and potable reuse, respectively. In the FO stream, water is drawn by osmosis from activated sludge through an FO membrane into a draw solution (DS), which becomes diluted during the process. A reverse osmosis (RO) system is then used to reconcentrate the diluted DS and produce clean water …
Rejection And Fate Of Trace Organic Compounds (Trocs) During Membrane Distillation, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William E. Price, Tzahi Cath, Long D. Nghiem
Rejection And Fate Of Trace Organic Compounds (Trocs) During Membrane Distillation, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William E. Price, Tzahi Cath, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
In this study, we examined the feasibility of membrane distillation (MD) for removing trace organic compounds (TrOCs) during water and wastewater treatment. A set of 29 compounds was selected to represent major TrOC groups, including pharmaceuticals, steroid hormones, phytoestrogens, UV-filters, industrial chemicals, and pesticides that occur ubiquitously in municipal wastewater. Results reported here suggest that rejection and fate and transport of TrOC during MD are governed by their volatility and, to a lesser extent, hydrophobicity. All TrOCs with pKH > 9 (which can be classified as non-volatile) were well removed by MD. Among the 29 TrOCs investigated in this study, three …
A Mathematical Analysis Of A Membrane Bioreactor Containing A Sludge Disintegration System, Mark Nelson, Thomas Yue
A Mathematical Analysis Of A Membrane Bioreactor Containing A Sludge Disintegration System, Mark Nelson, Thomas Yue
Faculty of Engineering and Information Sciences - Papers: Part A
The activated sludge process is widely used to treat domestic and industrial wastewater. A significant drawback of this process is the production of "sludge", the disposal of which can comprise a significant proportion of the total operating costs of a wastewater treatment plant. We analyze the steady-state operation of a membrane bioreactor system (MBR) incorporating a sludge disintegration unit (SDU) to reduce sludge production. We provide a qualitative understanding of the model by finding analytically the steady-state solutions of the model and determining its stability as a function of the residence time. In practice a target value of the mixed …
Effects Of Organic And Colloidal Fouling On The Rejection Of Two Pharmaceutically Active Compounds (Phacs) By Nanofiltration Processes: Role Of Membrane Foulants, Long D. Nghiem, Christiane Espendiller
Effects Of Organic And Colloidal Fouling On The Rejection Of Two Pharmaceutically Active Compounds (Phacs) By Nanofiltration Processes: Role Of Membrane Foulants, Long D. Nghiem, Christiane Espendiller
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
Toward Resource Recovery From Wastewater: Phosphorus Extraction From Digested Sludge Using Hybrid Forward Osmosis - Membrane Distillation Process, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Toward Resource Recovery From Wastewater: Phosphorus Extraction From Digested Sludge Using Hybrid Forward Osmosis - Membrane Distillation Process, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Faculty of Engineering and Information Sciences - Papers: Part A
We demonstrate the simultaneous extraction of phosphorus and clean water from digested sludge centrate using a forward osmosis (FO)−membrane distillation (MD) hybrid process. In this FO−MD hybrid process, FO concentrates orthophosphate and ammonium for subsequent phosphorus recovery in the form of struvite (MgNH4PO4·6H2O), while MD is used to recover the draw solution and extract clean water from the digested sludge centrate. A decline in water flux was observed during the FO process, but fouling was largely reversible after a brief, simple membrane flushing using deionized water. The FO process also provides an effective pretreatment capacity to the subsequent MD process, …
Enhancement Of Removal Of Trace Organic Contaminants By Powdered Activated Carbon Dosing Into Membrane Bioreactors, Ngoc Luong Nguyen, Faisal Ibney Hai, Long Nghiem, Jinguo Kang, William Price, Chul Park, Kazuo Yamamoto
Enhancement Of Removal Of Trace Organic Contaminants By Powdered Activated Carbon Dosing Into Membrane Bioreactors, Ngoc Luong Nguyen, Faisal Ibney Hai, Long Nghiem, Jinguo Kang, William Price, Chul Park, Kazuo Yamamoto
Faculty of Engineering and Information Sciences - Papers: Part A
This study compared the removal efficiency of 22 widespread trace organic contaminants by a laboratory-scale membrane bioreactor (MBR) with and without direct addition of powdered activated carbon (PAC) into the activated sludge reactor over a period of 312 days. The removal of hydrophilic and biologically persistent trace organic contaminants was immediately improved to above 95% after the addition of PAC into MBR. However, a compound-specific gradual decrease in removal underscored the requirement for the addition of fresh PAC. Adsorption onto PAC-added sludge appeared to play a significant role in the relatively more effective aqueous phase removal of a few resistant …
Water Reclamation From Shale Gas Drilling Flow-Back Fluid Using A Novel Forward Osmosis-Vacuum Membrane Distillation Hybrid System, Xue-Mei Li, Baolong Zhao, Zhongwei Wang, Ming Xie, Jianfeng Song, Long Nghiem, Tao He, Chi Yang, Chunxia Li, Ghang Chen
Water Reclamation From Shale Gas Drilling Flow-Back Fluid Using A Novel Forward Osmosis-Vacuum Membrane Distillation Hybrid System, Xue-Mei Li, Baolong Zhao, Zhongwei Wang, Ming Xie, Jianfeng Song, Long Nghiem, Tao He, Chi Yang, Chunxia Li, Ghang Chen
Faculty of Engineering and Information Sciences - Papers: Part A
This study examined the performance of a novel hybrid system of forward osmosis (FO) combined with vacuum membrane distillation (VMD) for reclaiming water from shale gas drilling flow-back fluid (SGDF). In the hybrid FO-VMD system, water permeated through the FO membrane into a draw solution reservoir, and the VMD process was used for draw solute recovery and clean water production. Using a SGDF sample obtained from a drilling site in China, the hybrid system could achieve almost 90% water recovery. Quality of the reclaimed water was comparable to that of bottled water. In the hybrid FO-VMD system, FO functions as …
Sodium Hydroxide Production From Sodium Carbonate And Bicarbonate Solutions Using Membrane Electrolysis: A Feasibility Study, Alexander R. Simon, Takahiro Fujioka, William Price, Long Nghiem
Sodium Hydroxide Production From Sodium Carbonate And Bicarbonate Solutions Using Membrane Electrolysis: A Feasibility Study, Alexander R. Simon, Takahiro Fujioka, William Price, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study demonstrates the feasibility of producing NaOH from coal seam gas (CSG) brine by membrane electrolysis.
N-Nitrosamine Rejection By Reverse Osmosis: Effects Of Membrane Exposure To Chemical Cleaning Reagents, Takahiro Fujioka, Stuart Khan, James Mcdonald, Annalie Roux, Yvan Poussade, Jorg Drewes, Long Nghiem
N-Nitrosamine Rejection By Reverse Osmosis: Effects Of Membrane Exposure To Chemical Cleaning Reagents, Takahiro Fujioka, Stuart Khan, James Mcdonald, Annalie Roux, Yvan Poussade, Jorg Drewes, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
No abstract provided.
A Novel Membrane Distillation-Thermophilic Bioreactor System: Biological Stability And Trace Organic Compound Removal, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William Price, Wenshan Guo, Hao H. Ngo, Tzahi Cath, Long Nghiem
A Novel Membrane Distillation-Thermophilic Bioreactor System: Biological Stability And Trace Organic Compound Removal, Kaushalya Wijekoon, Faisal Ibney Hai, Jinguo Kang, William Price, Wenshan Guo, Hao H. Ngo, Tzahi Cath, Long Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The removal of trace organic compounds (TrOCs) by a novel membrane distillation-thermophilic bioreactor (MDBR) system was examined. Salinity build-up and the thermophilic conditions to some extent adversely impacted the performance of the bioreactor, particularly the removal of total nitrogen and recalcitrant TrOCs. While most TrOCs were well removed by the thermophilic bioreactor, compounds containing electron withdrawing functional groups in their molecular structure were recalcitrant to biological treatment and their removal efficiency by the thermophilic bioreactor was low (0-53%). However, the overall performance of the novel MDBR system with respect to the removal of total organic carbon, total nitrogen, and TrOCs …
The Effects Of Feed Solution Temperature On Pore Size And Trace Organic Contaminant Rejection By The Nanofiltration Membrane Nf270, Hai Quang Dang, William E. Price, Long Duc Nghiem
The Effects Of Feed Solution Temperature On Pore Size And Trace Organic Contaminant Rejection By The Nanofiltration Membrane Nf270, Hai Quang Dang, William E. Price, Long Duc Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the effect of feed temperature on membrane pore size and the rejection of trace organic contaminants (TrOCs) by the nanofiltration (NF) membrane NF270. Filtration experiments were conducted using a cross flow membrane system at 20, 30 and 40 C. The membrane pore radius was estimated using the pore hindrance transport model at each temperature and the rejection data of three reference organic solutes (i.e. erythritol, xylose and glucose) experimentally obtained in this study. The results suggest that the pore size of an NF membrane is dependent on the feed solution temperature. An increase in the feed temperature …
Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Faculty of Engineering and Information Sciences - Papers: Part A
This study elucidates the relationship between membrane properties and the rejection of trace organic contaminants (TrOCs) in forward osmosis (FO). An asymmetric cellulose triacetate (CTA) and a thin-film composite (TFC) polyamide FO membrane were used for this investigation. The effective average pore radius (rp), selective barrier thickness over porosity parameter (l/ε), surface charge, support layer structural parameter (S), pure water permeability coefficient (A) and salt (NaCl) permeability coefficient (B) of the two membranes were systematically characterised. Results show that measured rejection of TrOCs as a function of permeate water flux can be well described by the pore hindrance transport model. …
Removal Of N-Nitrosamines By An Aerobic Membrane Bioreactor, Kaushalya C. Wijekoon, Takahiro Fujioka, James A. Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem
Removal Of N-Nitrosamines By An Aerobic Membrane Bioreactor, Kaushalya C. Wijekoon, Takahiro Fujioka, James A. Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the fate of eight N-nitrosamines during membrane bioreactor (MBR) treatment. The results suggest that biodegradation is mainly responsible for the removal of N-nitrosamines during MBR treatment. Other removal mechanisms were insignificant (e.g. adsorption to sludge) or not expected (e.g. photolysis and volatilization) given the experimental conditions and physicochemical properties of the N-nitrosamines studied here. N-nitrosamine removal efficiencies were from 24% to 94%, depending on their molecular properties. High removal of N-nitrosamines such as N-nitrosodimethylamine and N-nitrosodiethylamine could be explained by the presence of strong electron donating functional groups (EDG) in their structure. In contrast, N-nitrosomorpholine possessing the …
Enhanced Biological Phosphorus Removal And Its Modeling For The Activated Sludge And Membrane Bioreactor Processes, M F. R Zuthi, W S. Guo, H H. Ngo, L D. Nghiem, F I. Hai
Enhanced Biological Phosphorus Removal And Its Modeling For The Activated Sludge And Membrane Bioreactor Processes, M F. R Zuthi, W S. Guo, H H. Ngo, L D. Nghiem, F I. Hai
Faculty of Engineering and Information Sciences - Papers: Part A
A modified activated sludge process (ASP) for enhanced biological phosphorus removal (EBPR) needs to sustain stable performance for wastewater treatment to avoid eutrophication in the aquatic environment. Unfortunately, the overall efficiency of the EBPR in ASPs and membrane bioreactors (MBRs) is frequently hindered by different operational/system constraints. Moreover, although phosphorus removal data from several wastewater treatment systems are available, a comprehensive mathematical model of the process is still lacking. This paper presents a critical review that highlights the core issues of the biological phosphorus removal in ASPs and MBRs while discussing the inhibitory process requirements for other nutrients' removal. This …
Comparison Between Sequential And Simultaneous Application Of Activated Carbon With Membrane Bioreactor For Trace Organic Contaminant Removal, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, Long D. Nghiem, William E. Price, Wenshan Guo, Huu H. Ngo, Kuo-Lun Tung
Comparison Between Sequential And Simultaneous Application Of Activated Carbon With Membrane Bioreactor For Trace Organic Contaminant Removal, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, Long D. Nghiem, William E. Price, Wenshan Guo, Huu H. Ngo, Kuo-Lun Tung
Faculty of Engineering and Information Sciences - Papers: Part A
The removal efficiency of 22 selected trace organic contaminants by sequential application of granular activated carbon (GAC) and simultaneous application of powdered activated carbon (PAC) with membrane bioreactor (MBR) was compared in this study. Both sequential application of GAC following MBR treatment (MBR–GAC) and simultaneous application of PAC within MBR (PAC–MBR) achieved improved removal (over 95%) of seven hydrophilic and biologically persistent compounds, which were less efficiently removed by MBR-only treatment (negligible to 70%). However, gradual breakthrough of these compounds occurred over an extended operation period. Charged compounds, particularly, fenoprop and diclofenac, demonstrated the fastest breakthrough (complete and 50–70%, in …
Impact Of Humic Acid Fouling On Membrane Performance And Transport Of Pharmaceutically Active Compounds In Forward Osmosis, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Impact Of Humic Acid Fouling On Membrane Performance And Transport Of Pharmaceutically Active Compounds In Forward Osmosis, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Faculty of Engineering and Information Sciences - Papers: Part A
The impact of humic acid fouling on the membrane transport of two pharmaceutically active compounds (PhACs) - namely carbamazepine and sulfamethoxazole - in forward osmosis (FO) was investigated. Deposition of humic acid onto the membrane surface was promoted by the complexation with calcium ions in the feed solution and the increase in ionic strength at the membrane surface due to the reverse transport of NaCl draw solute. The increase in the humic acid deposition on the membrane surface led to a substantial decrease in the membrane salt (NaCl) permeability coefficient but did not result in a significant decrease in the …
Removal Of Bisphenol A And Diclofenac By A Novel Fungal Membrane Bioreactor Operated Under Non-Sterile Conditions, Shufan Yang, Faisal I. Hai, Long D. Nghiem, Luong N. Nguyen, Felicity Roddick, William E. Price
Removal Of Bisphenol A And Diclofenac By A Novel Fungal Membrane Bioreactor Operated Under Non-Sterile Conditions, Shufan Yang, Faisal I. Hai, Long D. Nghiem, Luong N. Nguyen, Felicity Roddick, William E. Price
Faculty of Engineering and Information Sciences - Papers: Part A
Previous studies have confirmed significant removal of various trace organic contaminants (TrOCs) by white-rot fungal cultures under sterile batch test conditions. However, little is known about TrOC removal in continuous flow fungal reactors in a non-sterile environment. This study reports the removal of two TrOCs, namely, bisphenol A and diclofenac, by a fungal membrane bioreactor (MBR).
Modification Of A Polyamide Reverse Osmosis Membrane By Heat Treatment For Enhanced Fouling Resistance, Takahiro Fujioka, Long D. Nghiem
Modification Of A Polyamide Reverse Osmosis Membrane By Heat Treatment For Enhanced Fouling Resistance, Takahiro Fujioka, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
The use of heat treatment to improve solute rejection and fouling resistance of a polyamide reverse osmosis (RO) membrane was investigated in this study. Heat treatment was carried out by immersing the membrane samples in Milli-Q water at 70 degrees celcius for a specific duration. Heat treatment reduced the pure water permeability from 4.1 to 2.8 L/m2 bar but improved conductivity rejection from 95.5 to 97.0 percent. As a result, a correlation was observed between changes in the two parameters. Marginal changes in the membrane surface characteristics were observed as a result of heat treatment. Heat treatment significantly improved the …
Mine Water Treatment Using A Vacuum Membrane Distillation System, Muttucumaru Sivakumar, M Ramezanianpour, G O Halloran
Mine Water Treatment Using A Vacuum Membrane Distillation System, Muttucumaru Sivakumar, M Ramezanianpour, G O Halloran
Faculty of Engineering and Information Sciences - Papers: Part A
Water scarcity and strict environmental regulations has seen the rapid development of membrane technologies in water and wastewater treatment. Effluent discharge from a local coal mine containing 2332 mg/L of TDS (Total Dissolved Solids), 14.4 mg/L of Ca, 2.72 mg/L of Mg, 1.92 mg/L of Fe and 3.38 mg/L of Al is treated by a vacuum membrane distillation system. This technology aims to remove particles and dissolved impurities by evaporation and condensation technique that mimics what occurs in nature within a water cycle. It employs a hollow-fiber membrane that enables to remove 99.9% of TDS from mine water. This paper …
Coupling Granular Activated Carbon Adsorption With Membrane Bioreactor Treatment For Trace Organic Contaminant Removal: Breakthrough Behaviour Of Persistent And Hydrophilic Compounds, Luong N. Nguyen, Faisal I. Hai, William E. Price, Jinguo Kang, Long D. Nghiem
Coupling Granular Activated Carbon Adsorption With Membrane Bioreactor Treatment For Trace Organic Contaminant Removal: Breakthrough Behaviour Of Persistent And Hydrophilic Compounds, Luong N. Nguyen, Faisal I. Hai, William E. Price, Jinguo Kang, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part A
This study investigated the removal of trace organic contaminants by a combined membrane bioreactor - granular activated carbon (MBR-GAC) system over a period of 196 days. Of the 22 compounds investigated here, all six hydrophilic compounds with electron-withdrawing functional groups (i.e., metronidazole, carbamazepine, ketoprofen, naproxen, fenoprop and diclofenac) exhibited very low removal efficiency by MBR-only treatment. GAC post-treatment initially complemented MBR treatment very well; however, a compound-specific gradual deterioration of the removal of the above-mentioned problematic compounds was noted. While a 20% breakthrough of all four negatively charged compounds namely ketoprofen, naproxen, fenoprop and diclofenac occurred within 1000-3000 bed volumes …