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Wastewater Reuse: Removal Of Emerging Trace Organic Contaminants (Troc), Faisal Hai, Long Nghiem, Stuart Khan, William Price, Kazuo Yamamoto
Wastewater Reuse: Removal Of Emerging Trace Organic Contaminants (Troc), Faisal Hai, Long Nghiem, Stuart Khan, William Price, Kazuo Yamamoto
Faisal I Hai
This chapter reviews current and new technologies for the removal of emerging TrOC from wastewater for reuse purposes. In particular, it compares the relative performance of Membrane bioreactors (MBR) with other conventional biological processes. It is shown that MBR has many intrinsic advantages over other methods leading to superior performance. Fundamental to this is the presence of a membrane barrier which provides a range of other adsorption mechanisms for TrOC. However, in practice there are many factors affecting TrOC removal by MBR, leading to sometimes conflicting reports in the literature from both lab scale studies as well as full scale …
Biocatalytic Membrane Reactors For The Removal Of Recalcitrant And Emerging Pollutants From Wastewater, F Hai, L Nghiem, O Modin
Biocatalytic Membrane Reactors For The Removal Of Recalcitrant And Emerging Pollutants From Wastewater, F Hai, L Nghiem, O Modin
Faisal I Hai
The potential fields of application of biocatalytic membrane reactors have widened considerably in recent years. Although biocatalytic membrane reactors, in general, are yet to achieve broad industrial application, in the not too far future they are expected to play a major role, not only for the production, transformation and valorization of raw materials but also for environmental remediations. This chapter comprehensively reviews the laboratory scale studies which demonstrate the potential of biocatalytic membrane reactors in wastewater treatment applications. Studies reponed in the literature, however, serve as proof of concept only. Issues that need to be addressed in order to achieve …
Removal Of Heavy Metals From Mining Impacted Water By An Electrocoagulation-Ultrafiltration Hybrid Process, Long Nghiem, Duminda Kumarasinghe, Liam Pettigrew
Removal Of Heavy Metals From Mining Impacted Water By An Electrocoagulation-Ultrafiltration Hybrid Process, Long Nghiem, Duminda Kumarasinghe, Liam Pettigrew
Long D Nghiem
In this study, the use of an electrocoagulation-ultrafiltration (EC-UF) hybrid system for the treatment of mining impacted wastewater was investigated. A model wastewater solution containing copper, lead, cadmium and other constituents representative of mining impacted wastewater was used in this investigation. The effects of key operational parameters including electrolysis time, current density, and solution pH on the performance of the EC and EC-UF systems were systematically investigated. The removal rates of copper and lead by the EC process were consistently higher than that of cadmium. It is probable that the removal mechanism of cadmium was different from that of the …
Effects Of Membrane Degradation On The Removal Of Pharmaceutically Active Com#163s (Phacs) By Nf/Ro Filtration Processes, Alexander Simon, Long Nghiem, Pierre Le-Clech, Stuart J. Khan, Jorg E. Drewes
Effects Of Membrane Degradation On The Removal Of Pharmaceutically Active Com#163s (Phacs) By Nf/Ro Filtration Processes, Alexander Simon, Long Nghiem, Pierre Le-Clech, Stuart J. Khan, Jorg E. Drewes
Long D Nghiem
The impacts of membrane degradation due to chlorine attack on the rejection of pharmaceutically active compounds (PhACs) by nanofiltration and reverse osmosis membranes were investigated in this study. Membrane degradation was simulated by soaking the membranes in a sodium hypochlorite solution of various concentrations over 18 h. Changes in membrane surface properties were characterised by contact angle measurement, atomic force microscopy analysis, and streaming potential measurement. The impacts of hypochlorite exposure to the membrane separation processes were ascertained by comparing the rejection of PhACs by virgin and chlorine-exposed membranes. Overall, the reverse osmosis BW30 membrane and the tight nanofiltration NF90 …
Removal Of Trace Organics By Mbr Treatment: The Role Of Molecular Properties, Nichanan Tadkaew, Faisal Hai, James Mcdonald, Stuart J. Khan, Long Nghiem
Removal Of Trace Organics By Mbr Treatment: The Role Of Molecular Properties, Nichanan Tadkaew, Faisal Hai, James Mcdonald, Stuart J. Khan, Long Nghiem
Long D Nghiem
This study examined the relationship between specific molecular features of trace organic contaminants and their removal efficiencies by a laboratory scale membrane bioreactor (MBR). Removal efficiencies of 40 trace organic compounds were assessed under stable operating conditions. The reported results demonstrate an apparent correlation between chemical structures and the removal of trace organic contaminants by the laboratory scale MBR system. The removal of all 14 very hydrophobic (Log D > 3.2) trace organic compounds selected in this study was consistently high and was above 85%. The occurrence and types of electron withdrawing or donating functional groups appear to be important factors …
Influence Of Feed Water Chemistry On The Removal Of Ionisable And Neutral Trace Organics By A Loose Nanofiltration Membrane, Long Nghiem
Long D Nghiem
This study examined the effects of feed water chemistry and membrane fouling on the rejection of trace organics by a loose nanofiltration membrane. One ionisable and one non-ionisable trace organics were selected for investigation. Results reported here indicate that the solution pH and ionic strength can markedly influence the removal of the ionisable trace organic compound sulfamethoxazole. These observations were explained by electrostatic interactions between the solutes and the membrane surface and by the speciation of the ionisable compound. On the other hand, no appreciable effects of solution pH and ionic strength on the rejection of the neutral compound carbamazepine …
Removal Of Trace Organic Contaminants By Submerged Membrane Bioreactors, Long Nghiem, Nichanan Tadkaew, Muttucumaru Sivakumar
Removal Of Trace Organic Contaminants By Submerged Membrane Bioreactors, Long Nghiem, Nichanan Tadkaew, Muttucumaru Sivakumar
Long D Nghiem
Laboratory scale experiments were conducted to investigate the removal mechanisms of trace organic contaminants using a submerged MBR system. The system was equipped with a Zeenon ZW-1 membrane module. Bisphenol A (BPA) and sulfamethoxazole were selected as model trace organics for the EDCs and PhACs, respectively. Results obtained from this study demonstrate an excellent performance of MBRs regarding basic water quality parameters such as turbidity, TOC and TN. However, removal efficiency of specific trace organic contaminants was found strongly dependent on their physicochemical properties. Approximately 90% removal of BPA was recorded, while under the same condition, the removal efficiency of …
Implications Of Membrane Fouling Toward The Removal Of The Pharmaceutical Sulfamethoxazole By Nanofiltration Processes, Alexander Simon, William Price, Long Nghiem
Implications Of Membrane Fouling Toward The Removal Of The Pharmaceutical Sulfamethoxazole By Nanofiltration Processes, Alexander Simon, William Price, Long Nghiem
Long D Nghiem
The influence of membrane fouling on the retention of the trace organic contaminant sulfamethoxazole by a nanofiltration (NF) process was investigated. Organic fouling caused a severe flux decline possibly due to pore blocking and adsorption directly after the commencement of the fouling layer development. Such membrane-foulant interactions were absent for colloidal fouling, which resulted in a more gradual flux decline. Membrane charge played a significant role in the separation process of inorganic salts, where the retention was the highest in a caustic environment (high pH) due to more swollen membrane material caused by the higher negative charge on the membrane. …
Removal Of The Antibacterial Agent Triclosan In Greywater Recycling Using Nanofiltration, Long Nghiem, Poppy Coleman
Removal Of The Antibacterial Agent Triclosan In Greywater Recycling Using Nanofiltration, Long Nghiem, Poppy Coleman
Long D Nghiem
No abstract provided.
Removal Of Heavy Metals Form Mining Impacted Water By A Novel Electrocoagulation-Ultrafiltration Hybrid Process, Liam Pettigrew, Long Nghiem, Muttucumaru Sivakumar
Removal Of Heavy Metals Form Mining Impacted Water By A Novel Electrocoagulation-Ultrafiltration Hybrid Process, Liam Pettigrew, Long Nghiem, Muttucumaru Sivakumar
Long D Nghiem
No abstract provided.
Influence Of Organic And Colloidal Fouling On The Removal Of Sulfamethoxazole By Nanofiltration Membranes, Long Nghiem, Christiane Espendiller, Gerd Braun
Influence Of Organic And Colloidal Fouling On The Removal Of Sulfamethoxazole By Nanofiltration Membranes, Long Nghiem, Christiane Espendiller, Gerd Braun
Long D Nghiem
This study investigated the effects of organic and colloidal fouling on the removal of a representative micropollutant sulfamethoxazole by two commercially available NF membranes. Alginate, bovine serum albumin, and colloidal silica were selected as model foulants to simulate hydrophilic and hydrophobic organic fractions, and colloidal matter that are often found in treated effluent and surface water. Membrane fouling was related to the membrane and foulant characteristics and subsequently the separation behaviour of the micropollutant sulfamethoxazole under different solution pH. On the basis of these results, it was confirmed that membrane fouling is strongly dependent on both the foulant and membrane …
Trace Organic Removal By Nanofiltration And Reverse Osmosis Processes, Long Nghiem
Trace Organic Removal By Nanofiltration And Reverse Osmosis Processes, Long Nghiem
Long D Nghiem
This monograph delineates the retention mechanisms of emerging trace organic contaminants by several nanofiltration (NF) and reverse osmosis membranes. Retention of neutral trace organics by a tight NF or RO membrane is dominated by steric (size) exclusion, whereas both electrostatic repulsion and steric exclusion govern the retention of negatively charged trace organics by a loose NF membrane. Speciation of trace organics may lead to a dramatic change in retention as a function of pH, with much greater retention observed for ionized, negatively charged trace organics. Retention of the negatively charged trace organics decreases as the solution?s ionic strength increases due …
Effects Of Organic Fouling On The Removal Of Trace Organic Contaminants By Nanofiltration Processes, Long Nghiem, Stuart Khan, Dirk Vogel
Effects Of Organic Fouling On The Removal Of Trace Organic Contaminants By Nanofiltration Processes, Long Nghiem, Stuart Khan, Dirk Vogel
Long D Nghiem
No abstract provided.
Strategies To Enhance The Removal Of The Persistent Pharmaceutically Active Compound Carbamazepine By Membrane Bioreactors, Xueqing Li, Faisal Hai, Nichanan Tadkaew, Sara Gilbertson, Long Nghiem
Strategies To Enhance The Removal Of The Persistent Pharmaceutically Active Compound Carbamazepine By Membrane Bioreactors, Xueqing Li, Faisal Hai, Nichanan Tadkaew, Sara Gilbertson, Long Nghiem
Faisal I Hai
Carbamazepine, which is an anti-epileptic drug, is ubiquitously present in municipal wastewater. Owing to its recalcitrant chemical structure, carbamazepine is not significantly removed during conventional biological treatment or even by membrane bioreactor (MBR). With the ultimate aim of providing insights into the strategies to enhance carbamazepine removal, the effect of key operational parameters, namely, loading rate (2–750 μg/L• d), pH (5–9), mixed liquor suspended solids (MLSS) concentration (1–15 g/L) and dissolved oxygen (DO) (