Anaerobic biodegradation and decolorization of a refractory acid dye by a forward osmosis membrane bioreactor

2018 ◽  
Vol 4 (2) ◽  
pp. 272-280 ◽  
Author(s):  
Fang Li ◽  
Qin Xia ◽  
Yingying Gao ◽  
Qianxun Cheng ◽  
Lián Ding ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Forward Osmosis ◽  
Anaerobic Biodegradation ◽  
Acid Dye ◽  
Osmotic Membrane Bioreactor

In this study, the feasibility of utilizing an anaerobic osmotic membrane bioreactor (OMBR) for the treatment of a refractory acid dye, Lanaset red G.GR, is demonstrated.

scholarly journals Methane production in an anaerobic osmotic membrane bioreactor using forward osmosis: Effect of reverse salt flux

2017 ◽  
Vol 239 ◽  
pp. 285-293 ◽  
Author(s):  
Sheng Li ◽  
Youngjin Kim ◽  
Sherub Phuntsho ◽  
Laura Chekli ◽  
Ho Kyong Shon ◽  
...  
Keyword(s):  
Methane Production ◽  
Membrane Bioreactor ◽  
Forward Osmosis ◽  
Salt Flux ◽  
Osmotic Membrane Bioreactor ◽  
Reverse Salt Flux

scholarly journals Impacts of inorganic draw solutes on the performance of thin-film composite forward osmosis membrane in a microfiltration assisted anaerobic osmotic membrane bioreactor

RSC Advances ◽  
2017 ◽  
Vol 7 (26) ◽  
pp. 16057-16063 ◽  
Author(s):  
Taozhan Hu ◽  
Xinhua Wang ◽  
Chen Wang ◽  
Xiufen Li ◽  
Yueping Ren
Keyword(s):  
Thin Film ◽  
Membrane Bioreactor ◽  
Forward Osmosis ◽  
Film Composite ◽  
Thin Film Composite ◽  
Donnan Equilibrium ◽  
N Concentration ◽  
Osmotic Membrane Bioreactor

A Donnan equilibrium led to a higher NH4+–N concentration and more severe FO biofouling for the draw solutes NaCl and MgCl2, respectively.

scholarly journals Optimization of Operating Conditions in Forward Osmosis for Osmotic Membrane Bioreactor

2009 ◽  
Vol 3 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Jian-Jun Qin ◽  
Maung Htun Oo ◽  
Guihe Tao ◽  
E. R. Cornelissen ◽  
C. J. Ruiken ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Membrane Bioreactor ◽  
Concentration Polarization ◽  
Forward Osmosis ◽  
Operating Conditions ◽  
Solute Diffusion ◽  
External Concentration ◽  
Selective Layer ◽  
Draw Solution ◽  
Osmotic Membrane Bioreactor

Objective of this study was to conduct a baseline study of osmotic membrane bioreactor (OMBR) - optimization of operating conditions in forward osmosis (FO). Experiments were conducted with an FO pilot system. Tap water was used as the feed and NaCl and MgSO4 solutions were used as draw solution. Effects of various operating conditions on flux have been investigated. In addition, pure water permeability of the FO membrane was tested. It was observed that the plant operation could be stablized within 1 h. When the membrane selective layer faced to the feed, a flux of 6.3 lm-2h-1 (LMH) was achieved at 24 atm osmotic pressure and 25 °C and effects of feed velocity and air velocity on flux were not siganificant under the testing conditions due to low external concentration polarization (ECP). However, when the selective layer faced to the draw solution, the flux was enhanced by 64% due to much reduced internal concentration polarization (ICP), the flux sharply increased with an increase in velocity of the draw solution in the laminar flow pattern range due to a countable effect of dilutive external concentration polarization (DECP) and leveled off after the flow pattern became turbulent. NaCl performed much higher efficiency than MgSO4 as an osmotic agent due to a greater solute diffusion coefficient of NaCl.

Preliminary study of osmotic membrane bioreactor: effects of draw solution on water flux and air scouring on fouling

2010 ◽  
Vol 62 (6) ◽  
pp. 1353-1360 ◽  
Author(s):  
Jian-Jun Qin ◽  
Kiran A. Kekre ◽  
Maung H. Oo ◽  
Guihe Tao ◽  
Chee L. Lay ◽  
...  
Keyword(s):  
Osmotic Pressure ◽  
Membrane Bioreactor ◽  
Water Flux ◽  
Forward Osmosis ◽  
Operating Conditions ◽  
Draw Solution ◽  
Membrane Flux ◽  
Osmotic Membrane Bioreactor ◽  
Flux Decline ◽  
Preliminary Study

Preliminary study on a novel osmotic membrane bioreactor (OMBR) was explored. Objective of this study was to investigate the effects of draw solution on membrane flux and air scouring at the feed side on fouling tendency in a pilot OMBR system composing the anoxic/aerobic and forward osmosis (FO) processes. Domestic sewage was the raw feed, FO membrane from HTI and NaCl/MgSO4 draw solutions were used in the experiments. Fluxes of 3 l/m2/h (LMH) and 7.2 LMH were achieved at osmotic pressure of 5 and 22.4 atm, respectively. No significant flux decline was observed at 3 LMH over 190 h and at 7.2 LMH over 150 h when air scouring was provided at the feed side of the membrane. However, without air scouring, the flux at 22.4 atm osmotic pressure declined by 30% after 195 h and then levelled off. The potential advantages of the fouling reversibility with air scouring under the operating conditions of the pilot OMBR and better water quality in OMBR over the conventional MBR were preliminarily demonstrated.

scholarly journals Nutrients Enrichment and Process Repercussions in Hybrid Microfiltration Osmotic Membrane Bioreactor: A Guideline for Forward Osmosis Development Based on Lab-Scale Experience

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1098
Author(s):  
Khum Gurung ◽  
Morten Lykkegaard Christensen ◽  
Mika Sillanpää ◽  
Mohamed Chaker Ncibi ◽  
Mads Koustrup Jørgensen
Keyword(s):  
Water Permeability ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Forward Osmosis ◽  
Microbial Inactivation ◽  
Transmembrane Pressure ◽  
Pressure Step ◽  
Draw Solution ◽  
Osmotic Membrane Bioreactor

The effects of reverse salt diffusion through a forward osmosis membrane were studied in a microfiltration osmotic membrane bioreactor. The reactor was used to treat and simultaneously concentrate nutrients from wastewater. The system was operated at different draw solution concentrations, leading to varying salinity conditions. A relatively low, yet stable forward osmosis flux was observed regardless of increasing draw solution conductivities from 10 to 50 mS cm−1. A substantial increase in sludge conductivity from 5.7 to 19.8 mS cm−1 was observed during the operation. Batch transmembrane pressure-step experiments showed a decline in sludge filtration properties with increasing salinity buildup in sludge due to increasing deflocculation and associated release of protein and carbohydrate fractions of extracellular polymeric substances. Mathematical simulations showed that accumulation of total dissolved solids could mainly be attributed to reverse flux of salts from the draw solution rather than by the enrichment of incoming nutrients when forward osmosis membrane’s salt permeability was high and water permeability low. Ideally, salt permeability below 0.010 L m−2 h−1 and effective water permeability above 0.13 L m−2 h−1 bar−1 are crucial to ensure enhanced nutrient enrichment and reduce sludge osmotic pressure, microbial inactivation, sludge deflocculation and membrane fouling.

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