Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Entire DC Network
Removal Of Micropollutants By Membrane Bioreactor Under Temperature Variation, Faisal I. Hai, Karin Tessmer, Luong N. Nguyen, Jinguo Kang, William E. Price, Long Nghiem
Removal Of Micropollutants By Membrane Bioreactor Under Temperature Variation, Faisal I. Hai, Karin Tessmer, Luong N. Nguyen, Jinguo Kang, William E. Price, Long Nghiem
William E. Price
The effects of controlled temperature variation in the range of 10–45 °C were assessed in a lab-scale MBR that treated synthetic municipal wastewater spiked with selected micropollutants. The effects were evaluated with respect to total organic carbon (TOC) and total nitrogen (TN) removal, micropollutant removal, sludge growth, level of soluble microbial products (SMPs) in the mixed liquor and membrane fouling. Overall, the temperature shifts caused high variation in the TOC and TN levels in the reactor supernatant, however that in membrane-permeate was relatively more stable, substantiating the robustness of the MBR process. Results regarding the removal of micropollutants at ambient …
Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem
Removal Of Trace Organic Contaminants By A Membrane Bioreactor-Granular Activated Carbon (Mbr -Gac) System, Luong N. Nguyen, Faisal I. Hai, Jinguo Kang, William E. Price, Long Nghiem
William E. Price
The removal of trace organics by a membrane bioreactor–granular activated carbon (MBR–GAC) integrated system were investigated. The results confirmed that MBR treatment can be effective for the removal of hydrophobic (logD > 3.2) and readily biodegradable trace organics. The data also highlighted the limitation of MBR in removing hydrophilic and persistent compounds (e.g. carbamazepine, diclofenac, and fenoprop) and that GAC could complement MBR very well as a post-treatment process. The MBR– GAC system showed high removal of all selected trace organics including those that are hydrophilic and persistent to biological degradation at up to 406 bed volumes (BV). However, over an …
Comparison Of The Removal Of Hydrophobic Trace Organic Contaminants By Forward Osmosis And Reverse Osmosis, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
Comparison Of The Removal Of Hydrophobic Trace Organic Contaminants By Forward Osmosis And Reverse Osmosis, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech
William E. Price
We compared the rejection behaviours of three hydrophobic trace organic contaminants, bisphenol A, triclosan and diclofenac, in forward osmosis (FO) and reverse osmosis (RO). Using erythritol, xylose and glucose as inert reference organic solutes and the membrane pore transport model, the mean effective pore size of a commercial cellulose-based FO membrane was estimated to be 0.74 nm. When NaCl was used as the draw solute, at the same water permeate flux of 5.4 L/m2 h (or 1.5 mm/s), the adsorption of all three compounds to the membrane in the FO mode was consistently lower than that in the RO mode. …
Removal Of Carbamazepine And Sulfamethoxazole By Mbr Under Anoxic And Aerobic Conditions, Faisal I. Hai, Xueqing Li, William E. Price, Long Nghiem
Removal Of Carbamazepine And Sulfamethoxazole By Mbr Under Anoxic And Aerobic Conditions, Faisal I. Hai, Xueqing Li, William E. Price, Long Nghiem
William E. Price
This study reveals for the first time that near-anoxic conditions (dissolved oxygen, DO - 0.5 mg/L) can be a favorable operating regime for the removal of the persistent micropollutant carbamazepine by MBR treatment. The removal efficiencies of carbamazepine and sulfamethoxazole by an MBR were systematically examined and compared under near-anoxic (DO'" 0.5 mg/L) and aerobic (DO> 2 mg/L) conditions. Preliminary batch tests confirmed that sulfamethoxazole is amenable to both aerobic and anoxic biotransformation. However, carbamazepine-a known persistent compound-showed degradation only under an anoxic environment. In good agreement with the batch tests, during near-anoxic operation, under a high loading of 750 …
Rejection Of Pharmaceutically Active Compounds By Forward Osmosis: Role Of Solution Ph And Membrane Orientation, Ming Xie, William E. Price, Long D. Nghiem
Rejection Of Pharmaceutically Active Compounds By Forward Osmosis: Role Of Solution Ph And Membrane Orientation, Ming Xie, William E. Price, Long D. Nghiem
William E. Price
The effects of feed solution pH and membrane orientation on water flux and the rejection of carbamazepine and sulfamethoxazole were investigated using a bench scale forward osmosis (FO) system. Water flux was pH-dependent in both membrane orientations. In addition, water flux increased while the specific reverse salt flux and hydrogen ion flux decreased with increasing feed solution pH. Water flux was lower in the normal FO mode compared to that in the pressure retarded osmosis (PRO) mode because osmotic pressure differential was reduced due to the internal concentration polarisation (ICP) phenomenon. The rejection of neutral carbamazepine was generally pH independent …
Performance Of A Novel Osmotic Membrane Bioreactor (Ombr) System: Flux Stability And Removal Of Trace Organics, Abdulhakeem Alturki, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long Nghiem
Performance Of A Novel Osmotic Membrane Bioreactor (Ombr) System: Flux Stability And Removal Of Trace Organics, Abdulhakeem Alturki, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long Nghiem
William E. Price
Results reported here highlight the potential and several challenges in the development of a novel osmotic membrane bioreactor (OMBR) process for the treatment of municipal wastewater. Following the initial gradual decline, a stable permeate flux value was obtained after approximately four days of continuous operation. There was evidence of continuous deterioration of biological activity of the OMBR system, possibly due to the build-up of salinity in the reactor. The removal of 25 out of 27 trace organic compounds with molecular weight higher than 266 g/mol was above 80% and was possibly governed by the interplay between physical separation of the …