NAMS 2002 Workshop - ICOM 2008

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Membrane Fouling - General Topics – 4 Monday July 14, 11:15 AM-11:45 AM, O’ahu MBR Activated Sludge Filterability Alteration in Stress Circumstances S. Geilvoet (Speaker), Delft University of Technology, The Netherlands, s.p.geilvoet@tudelft.nl J. Van der Graaf, Delft University of Technology, The Netherlands A. Van NIeuwenhuijzen, Delft University of Technology, The Netherlands Fouling in membrane bioreactor (MBR) systems is an extensively investigated research topic. Significant progress has been made in understanding fouling, but nevertheless it still is a major point of attention in full-scale MBR operation and many questions still remain unanswered. Simply stated the fouling potential in a membrane bioreactor (MBR) system is depending on three factors: membrane properties, membrane operation and activated sludge properties. Because in practice every MBR plant has its own unique combination of these three factors, it is difficult to determine which factor(s) is/are responsible in case of fouling problems. Delft University of Technology has developed a filtration characterization method that aims at determining the role of sludge characteristics in the filtration process. Sludge samples collected from different full-scale MBR plants or under different circumstances are filtrated with the same membrane under exact identical operational circumstances with the Delft Filtration Characterization method (DFCm). In this way differences in filterability can be related exclusively to the quality of the sludge sample. Several researchers demonstrated that when activated sludge is experiencing stress conditions severe fouling problems can occur. In this research two different stress conditions were simulated. Activated sludge samples collected from full-scale MBR Heenvliet in the Netherlands were exposed to a long period without aeration and to a short period of high shear stress conditions induced by a centrifugal pump. Goal of the research was to examine the effect of these stress conditions on the sludge filterability and characteristics and the ability of the sludge to recover from it. The filtration characterization experiments were accompanied by several sludge quality analyses: the concentration Soluble Microbial Products (SMP), Particle Size Distribution (PSD) in the submicron range of the free water and sludge viscosity were measured. The results show that exposing the sludge to stress conditions lead to deflocculation of the sludge which was expressed in the release of SMP and of colloidal particles in the free water and a deterioration of the filterability. When the sludge was subsequently preserved in continuous aerated conditions, it showed a strong ability to recover from the stress circumstances. The sludge quality deterioration which was obtained in approximately three days of anoxic circumstances was undone in a period of only several hours. Together with the
improvement of filterability also the SMP concentrations and the number of colloidal particles in the free water decreased. From this research it was concluded that flocculation is a very important parameter for sludge filtration. Looking after favorable flocculation conditions in MBR as soon as the sludge reaches the membrane tank is an important aspect for good MBR operation.
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ICOM 2008 Oral Presentation Proceed
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Professor Yoram Cohen Professor Joh
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ICOM 2008 Staff: The University of
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ICOM 2008 Workshop Schedule: Saturd
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Monday, July 14 - Afternoon Session
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Tuesday, July 15 - Afternoon Sessio
Page 13 and 14: 8:15AM 8:35AM EMS Barrer Prize (Mau
Page 15 and 16: Friday, July 18 - Morning Sessions
Page 17 and 18: Oral Presentation Abstracts Morning
Page 19 and 20: Gas Separation I - 1 - Keynote Mond
Page 21 and 22: esulting permeability selectivity o
Page 23 and 24: chain packing. To ensure a well pha
Page 25 and 26: Gas Separation I - 5 Monday July 14
Page 27 and 28: satisfactory way the corresponding
Page 29 and 30: Drinking and Wastewater Application
Page 35 and 36: an adjusted water management in the
Page 37 and 38: prospect for new energy sources as
Page 39 and 40: oxygen removal to the desired pH. C
Page 41 and 42: (Cl - , SO4 2- , As(V)) and water t
Page 43 and 44: [1] R. Lima de Miranda, J. Kruse, K
Page 45 and 46: Polymeric Membranes I - 4 Monday Ju
Page 47 and 48: Polymeric Membranes I - 5 Monday Ju
Page 49 and 50: Biomedical and Biotechnology I - 1
Page 53 and 54: Acknowledgments The Authors acknowl
Page 55 and 56: isolation of CD34+ cells was achiev
Page 59 and 60: membranes were then challenged with
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Page 69 and 70: observed in two subsequence phenome
Page 71 and 72: Membrane Modeling I - Fundamental A
Page 73 and 74: Membrane Modeling I - Fundamental A
Page 75 and 76: of the impact of the operating para
Page 77 and 78: Oral Presentation Abstracts Afterno
Page 79 and 80: Hybrid and Novel Processes I - 2 Mo
Page 81 and 82: Arora, M.B., J.A. Hestekin, S.W. Sn
Page 83 and 84: Conclusions Reverse electrodialysis
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Page 87 and 88: eaction with mediator due to the co
Page 89 and 90: Nanofiltration and Reverse Osmosis
Page 91 and 92: 4.3x10 -6 to 7.4x10 -6 cm 2 /s. Bas
Page 93 and 94: The development of these membranes
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investigated at first. As a result,
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Desalination I - 2 Monday July 14,
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Composite Polymeric Membrane Format
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NAMS Alan S. Michaels Award - 1a Tu
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NAMS Alan S. Michaels Award - 2 Tue
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opportunities for improving membran
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NAMS Alan S. Michaels Award - 4b Tu
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Nanofiltration and Reverse Osmosis
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[4] K. Vanherck et al. Accepted for
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accumulation had a strong effect on
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and, if so, to develop correlations
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non-porous and porous membranes are
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[2] Palmeri, J., Sandeaux, R. Sande
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fouling. Information obtained from
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This work performed under the auspi
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etween Ru(bi-pyridine)3 2+ and meth
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[1] M. Barboiu, C. Luca, C. Guizard
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Nanostructured Membranes II - 5 Tue
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Nanostructured Membranes II - 6 Tue
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than 10 nm. XRD data suggest that t
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Pervaporation and Vapor Permeation
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ethanol/butanol (non solvent) combi
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forward osmosis, the RO process is
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Osmotically Driven Membrane Process
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References: [1] Stupp, S. I.; Lebon
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temperatures might bring about the
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References [1] S. Benita, Microenca
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solvent, were investigated (where a
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ease of manipulation as this allows
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Horizontal shrinkage does not have
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Absorption of water was determined
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Gas Separation II - 1 - Keynote Tue
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Gas Separation II - 2 Tuesday July
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concentration. These results are co
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Gas Separation II - 5 Tuesday July
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will be shown that homogeneous film
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which can adsorb on the surface of
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Drinking and Wastewater Application
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were collected, the viable bacteria
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pressure, and permporosimetry with
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Inorganic Membranes I - 3 Tuesday J
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Membrane Fouling - UF & Water Treat
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Membrane Modeling II - Gas Separati
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[10] Wang BG, Lv HL, Yang JC. Chem
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Membrane and Surface Modification I
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Oral Presentation Abstracts Morning
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Gas Separation III - 1 - Keynote We
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Gas Separation III - 2 Wednesday Ju
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separation was next blended with di
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Polymeric Membranes II - 1 - Keynot
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Polymeric Membranes II - 3 Wednesda
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5. Erdodi, G.; Kennedy, J. P.; Prog
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observed for different locations in
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Biomedical and Biotechnology II - 3
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applied in the first two fields wil
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distribution of SBMA units within t
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5500 ppm (15 mM) was lowered to 30
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increasing the effective size of th
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etween 0 and 1), the automatic feed
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Membrane Modeling III - Process Sim
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Membrane Modeling III - Process Sim
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models developed suggests that ther
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start level has a huge impact on th
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Ultra- and Microfiltration I - Tran
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all three binary protein UF systems
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Synthetic solutions of ±-lactalbum
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Oral Presentation Abstracts Morning
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Gas Separation IV - 2 Thursday July
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6. T. C. Merkel, Z. He, I. Pinnau,
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EMS Barrer Prize - 1b Thursday July
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EMS Barrer Prize - 3 Thursday July
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EMS Barrer Prize - 4b Thursday July
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EMS Barrer Prize - 5 Thursday July
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therapy options have been modelled
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Ultra- and Microfiltration II - Pro
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in the vicinity of the rising bubbl
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of feed water ionic strength) on re
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technology that has gained growing
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Optimize polymeric membranes for sa
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Inorganic Membranes II - 2 Thursday
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confirms that the carbon dioxide pe
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permeability, stability issues comp
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Fuel Cells II - 2 Thursday July 17,
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5. Conclusion In this work, the evo
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Oral Presentation Abstracts Afterno
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an essentially pure H2 product is c
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In the presentation, we will presen
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was observed, indicative of the sim
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References Arora, M.B., J.A. Hestek
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performance of fibers is analyzed a
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Membrane Fouling III - RO & Biofoul
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[4] H. Noureddini, Book of Abstract
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component (PX, OX) separation via p
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Generally these results were in goo
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introduction of methyl groups into
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separation quality (10 µS/cm) and
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Desalination II - 3 Thursday July 1
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drop are linearly related (although
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antiscalant oxidation has been limi
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oth 15±5 kDa, which suggests that
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Atomic Force Microscopy (AFM), and
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y single gas permeation experiments
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PDMS toplayers were only partially
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noting that cross-linking agents co
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such extended parameter space in th
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Hybrid Membranes - 6 Thursday July
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Plenary Lecture III Friday July 18.
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Gas Separation V - 1 - Keynote Frid
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References: [1] H. Lin, E. Van Wagn
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elative contributions of Fickian di
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Gas Separation V - 4 Friday July 18
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Gas Separation V - 6 Friday July 18
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Electron Microscopy (TEM) analyses
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- Hybrid RO train: A hybrid RO trai
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concentration as well as on the sod
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scaling deposits in the DCMD device
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Silica colloidal solution with diff
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Membrane Fouling IV - RO & Desalina
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Polyacrylonitrile (PAN) UF membrane
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the polymer dope was PEI (12 wt%),
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Inorganic Membranes III - 1 - Keyno
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Inorganic Membranes III - 2 Friday
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CO2/H2 selectivity at high temperat
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ammonia complexes in aqueous soluti
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possible to have a membrane capable
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fired boiler flue gas, SOx and merc
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EPR/Ago/p-benzoquinone composite sh
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elated to the presence of free elec
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surroundings. When the temperature
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that no absorbent was detected in t
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days of filtration from 120 to 7-10
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was performed to restore membrane f
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with the SRT of 65 days, no correla
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Results Critical flux measurements
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MLSS is not directly proportional t
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Fuel Cells III - 2 Friday July 18,
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Fuel Cells III - 4 Friday July 18,
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Ultra- and Microfiltration III - Me
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can be deduced from the imaginary p
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membranes. The analysis of the ligh
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Membrane Contactors - 2 Friday July
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absorption liquid in the pores of t
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Packaging and Barrier Materials - 1
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Historically, all the approaches de
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