Removal efficiency and integrity monitoring techniques for virus removal by membrane processes

Critical Reviews in Environmental Science and Technology

Volumn 42, Issue 9, 2012, Pages 891-933

  Antony, Alice ^a   Blackbeard, Judy ^b   Leslie, Greg ^a  

^a UNIVERSITY OF NEW SOUTH WALES   (Australia)

^b Water Recycling Research with Melbourne Water   (Australia)

Author keywords

Challenge testing; Membrane integrity; MS2 phage; Removal efficiency; Virus rejection

Indexed keywords

EFFICIENCY; FIBER OPTIC SENSORS; HEALTH RISKS; MEMBRANES; O RINGS; PATHOGENS; PORE SIZE; PROCESS CONTROL; PROCESS MONITORING; SEALS; VIRUSES; WATER FILTRATION; WATER QUALITY; WATER TREATMENT;

MEMBRANE INTEGRITY; MICROBIAL CONTAMINATION; MOLECULAR WEIGHT CUTOFF; MONITORING TECHNIQUES; MS2 PHAGE; PHYSICOCHEMICAL PROPERTY; REMOVAL EFFICIENCIES; SEPARATION EFFICIENCY;

MICROFILTRATION;

EID: 84870932754     PISSN: 10643389     EISSN: 15476537     Source Type: Journal    
DOI: 10.1080/10643389.2011.556539     Document Type: Article

References (121)

1. Adham, S. S., Gagliardo, P., Smith, D., Ross, D., Gramith, K., and Trussell, R. (1998). Monitoring the integrity of reverse osmosis membranes. Desalination 119, 143-150.
2. Adham, S. S., and Jacangelo, J. G. (1994). Assessing the reliability of low pressure membrane systems for microbial removal. Paper presented at the National Conference on Environmental Engineering on Critical Issues in Water and Wastewater Treatment, Boulder, CO.
3. Adham, S. S., Jacangelo, J. G., and Laine, J. M. (1995). Low-pressure membranes: Assessing integrity. Journal of the American Water Works Association 87, 62-75.
4. Adham, S. S., Trussell, R. S., Trussell, R. S., Gagliardo, P. F., and Trussell, R. R. (1998). Rejection of MS-2 virus by RO membranes. Journal of the American Water Works Association 90, 130-135.
5. Akhtar, S., Hurl, M., and Neilands, S. (2005). Application of batch particle counters for monitoring membrane integrity. Paper presented at the Canadian Society for Civil Engineering Annual Conference, Toronto, Ontario, Canada.
6. American Public Health Association, American Water Works Association, and the Water Environment Foundation. (1998). Standard methods for the examination of water and wastewater. Washington, DC: American Public Health Association.
7. Arkhangelsky, E., and Gitis, V. (2008). Effect of transmembrane pressure on rejection of viruses by ultrafiltration membranes. Separation and Purification Technology 62, 619-628.
8. Arkhangelsky, E., Kuzmenko, D., and Gitis, V. (2007). Impact of chemical cleaning on properties and functioning of polyethersulfone membranes. Journal of Membrane Science 305, 176-184.
9. ASTM. (2006). Standard practice for integrity testing of water filtration membrane systems (D6908-06). West Conshohocken, PA: Author.
10. ASTM. (2008). Standard practices for detecting leaks in reverse osmosis and nanofiltration devices (D3923-08). West Conshohocken, PA: Author.
11. Banerjee, A., Carlson, K., and Lozier, J. (2000a). Monitoring membrane integrity using ultra high sensitive laser light. Paper presented at the AWWA Water Quality Technology Conference, Salt Lake City, Utah.
12. Banerjee, A., Hanson, F., Paoli, E., Korbe, C., Kolman, R., Nelson, D., Smith, K., and Lambertson, M. (1999a). Ultra low range instrument increases turbidimetric sensitivity by two orders of magnitude. Paper presented at the AWWA Water Quality Technology Conference, Tampa, Florida.
13. Banerjee, A., Lambertson, M., and Carlson, K. (1999b). Sub-micron particles in drinking water and their role in monitoring the performance of filtration processes. Paper presented at the AWWA Water Quality Technology Conference, Tampa, Florida.
14. Banerjee, A., Lambertson, M., Lozier, J., and Colvin, C. (2000b). Monitoring membrane integrity using high sensitivity laser turbidimetry. Water Science and Technology: Water Supply 1, 273-276.
15. Banerjee, A., Lozier, F., and Carlson, K. (2001). An on-line, multi-sensor, membrane filtration permeate water quality monitoring system. Paper presented at the AWWA Membrane Technology Conference, San Antonio, Texas.
16. Bennett, A. (2005). Maintaining the integrity of filtration systems. Filtration & Separation 42, 30-33.
17. Bennett, A. (2008). Drinking water: Pathogen removal from water - technologies and techniques. Filtration & Separation 45(10), 14-16.
18. Blatchley, E. R. III, Shen, C., Scheible, O. K., Robinson, J. P., Ragheb, K., Bergstrom, D. E., and Rokjer, D. (2008). Validation of large-scale, monochromatic UV disinfection systems for drinking water using dyed microspheres. Water Research 42, 677-688.
19. Carr, M. C., Carlson, K. H., and Sadar, M. (2003). Membrane integrity monitoring with distributed laser turbidimetry. Journal of the American Water Works Association 95(6), 83-94.
20. Childress, A. E., Le-Clech, P., Daugherty, J. L., Chen, C., and Leslie, G. L. (2005). Mechanical analysis of hollow fiber membrane integrity in water reuse applications. Desalination 180, 5-14.
21. Colvin, C. K., Acker, C. L., Marinas, B. J., and Lozier, J. C. (1999). Mechanisms responsible for the passage of microorganisms through RO and NF membranes. Paper presented at the AWWA Membrane Conference, Long Beach, CA.
22. Colvin, C., Brauer, R., DiNatale, K., and Scribner, T. (2001). Comparing laser turbidimetry with conventional methods for monitoring MF and UF membrane integrity. Paper presented at the AWWA Membrane Technology Conference, San Antonio, Texas.
23. Crozes, G. F., Sethi, S., Mi, B., Curl, J., and Mariñas, B. (2002). Improving membrane integrity monitoring indirect methods to reduce plant downtime and increase microbial removal credit. Desalination 149, 493-497.
24. Deluhery, J., and Rajagopalan, N. (2008). Use of paramagnetic particles in membrane integrity testing. Journal of Membrane Science 318, 176-181.
25. Dowd, S. E., Pillai, S. D., Wang, S., and Corapcioglu, M. Y. (1998). Delineating the specific influence of virus isoelectric point and size on virus adsorption and transport through sandy soils. Applied and Environmental Microbiology 64, 405-410.
26. Farahbakhsh, K., and Smith, D. W. (2004a). Estimating air diffusion contribution to pressure decay during membrane integrity tests. Journal of Membrane Science 237, 203-212.
27. Farahbakhsh, K., and Smith, D. W. (2004b). Removal of coliphages in secondary effluent by microfiltration - mechanisms of removal and impact of operating parameters. Water Research 38, 585-592.
28. Farahbakhsh, K., and Smith, D. W. (2006). Membrane filtration for cold regions: Impact of cold water on membrane integrity monitoring tests. Journal of Environmental Engineering and Science 5, S69-S75.
29. Field, R. W., Wu, D., Howell, J. A., and Gupta, B. B. (1995). Critical flux concept for microfiltration fouling. Journal of Membrane Science 100, 259-272.
30. Fiksdal, L., and Leiknes, T. (2006). The effect of coagulation with MF/UF membrane filtration for the removal of virus in drinking water. Journal of Membrane Science 279, 364-371.
31. Filmtec. (n.d.). Troubleshooting: Membrane element vvaluation, Vacuum decay test. Technical manual excerpt, Form No. 609-02115-1004.
32. Freedonia Group. (2009). World membrane separation technologies: Industry study with forecasts for 2012 & 2017. Study No. 468.
33. Gerba, C. P. (1984). Applied and theoretical aspects of virus adsorption to surfaces. Advances in Applied Microbiology 30, 133-168.
34. Giglia, S., and Krishnan, M. (2008). High sensitivity binary gas integrity test for membrane filters. Journal of Membrane Science 323, 60-66.
35. Gijsbertsen-Abrahamse, A. J., Cornelissen, E. R., and Hofman, J. A. M. H. (2006). Fiber failure frequency and causes of hollow fiber integrity loss. Desalination 194, 251-258.
36. Gitis, V., Adin, A., Nasser, A., Gun, J., and Lev, O. (2002). Fluorescent dye labeled bacteriophages - a new tracer for the investigation of viral transport in porous media: 1. Introduction and characterization. Water Research 36, 4227-4234.
37. Gitis, V., Haught, R. C., Clark, R. M., Gun, J., and Lev, O. (2006). Application of nanoscale probes for the evaluation of the integrity of ultrafiltration membranes. Journal of Membrane Science 276, 185-192.
38. Glucina, K., Do-Quang, Z., and Lainé, J. M. (1997). Assessment of a particle counting method for hollow fiber membrane integrity. Desalination 113, 183-187.
39. Grabow, W. O. K. (2001). Bacteriophages: Update on application as models for viruses in water. Water SA 27, 251-268.
40. Guo, H., Wyart, Y., Perot, J., Nauleau, F., and Moulin, P. (2010). Application of magnetic nanoparticles for UF membrane integrity monitoring at low-pressure operation. Journal of Membrane Science 350, 172-179.
41. Herath, G., Yamamoto, K., and Urase, T. (1999). Removal of viruses by microfiltration membranes at different solution environments. Water Science and Technology 40, 331-338.
42. Herath, G., Yamamoto, K., and Urase, T. (2000). The effect of suction velocity on concentration polarization in microfiltration membranes under turbulent flow conditions. Journal of Membrane Science 169, 175-183.
43. Hijnen, W. A. M., Beerendonk, E. F., and Medema, G. J. (2006). Inactivation credit of UV radiation for viruses, bacteria and protozoan (oo)cysts in water: A review. Water Research 40, 3-22.
44. Hofmann, F. (1984). Integrity testing of microfiltration membranes. Journal of Parenteral Science and Technology 38, 148-158.
45. Hong, S. K., Miller, F. A., and Taylor, J. S. (2001). Assessing pathogen removal efficiency of microfiltration by monitoring membrane integrity. Water Science and Technology: Water Supply 1, 43-48.
46. Howell, J. A. (1995). Sub-critical flux operation of microfiltration. Journal of Membrane Science 107, 165-171.
47. Hu, J. Y., Ong, S. L., Song, L. F., Feng, Y. Y., Liu, W. T., Tan, T. W., Lee, L. Y., and Ng, W. J. (2003). Removal of MS2 bacteriophage using membrane technologies. Water Science and Technology 47, 163-168.
48. Huisman, I. H., and Williams, K. (2004). Autopsy and failure analysis of ultrafiltration membranes from a waste-water treatment system. Desalination 165, 161-164.
49. Jacangelo, J. G., Adham, S., et al. (1997). Membrane filtration for microbial removal. West Conshohocken, PA: American Water Works Association.
50. Jacangelo, J. G., Adham, S. S., and Laine, J. M. (1995). Mechanism of cryptosporidium, giardia, and MS2 virus removal by MF and UF. Journal of the American Water Works Association 87(9), 107-121.
51. Jacangelo, J. G., Patania Brown, N. L., and Madec, A. (2006). Micro- and ultrafiltration performance specifications based on microbial removal. West Conshohocken, PA: American Water Works Association.
52. Jacangelo, J. G., Laine, J. M., Cummings, E. L., and Adham, S. S. (1991). Low-pressure membrane filtration for removing giardia and microbial indicators. Journal of the American Water Works Association 83(9), 97-106.
53. Jacangelo, J. G., Madec, A., Schwab, K. J., Huffman, D. E., and Mysore, C. S. (2005). Advances in the use of low-pressure, hollow fiber membranes for the disinfection of water. Water Science and Technology: Water Supply 5, 109-115.
54. Jacangelo, J. G., Riley, K., Cairns, K. E., Cummings, E. W., and Mallevialle, J. (1991). Evaluation of low pressure membrane filtration as a water treatment alternative for the removal of Giardia and microbial indicators. Paper presented at the AWWA Annual Conference: Water Quality for the New Decade, Philadelphia, Pennsylvania.
55. Jacangelo, J. G., and Trussell, R. R. (2002). International report: Water and wastewater disinfection: Trends, issues and practices. Water Science and Technology: Water Supply 2, 147-157.
56. Johnson, W. T. (1997). Automatic monitoring of membrane integrity in microfiltration systems. Desalination 113, 303-307.
57. Johnson, W. T. (1998). Predicting log removal performance of membrane systems using in-situ integrity testing. Filtration & Separation 35, 26-29.
58. Johnson, W. T., and MacCormick, T. (2003). Issues of operational integrity in membrane drinking water plants. Water Science and Technology: Water Supply 3, 73-80.
59. Jons, S., Haynes, T., and Nathan, J. (2005). Sensitive integrity test for RO/NF elements. IWC-05-16. Paper presented at the International Water Conference, Orlando, Florida.
60. Kitis, M., Lozier, J. C., Kim, J. H., Mi, B., and Mariñas, B. J. (2003a). Evaluation of biologic and non-biologic methods for assessing virus removal and integrity of high pressure membrane systems. Water Science and Technology: Water Supply 3, 81-92.
61. Kitis, M., Lozier, J. C., Kim, J. H., Mi, B., and Mariñas, B. J. (2003b). Microbial removal and integrity monitoring of RO and NF membranes. Journal of the American Water Works Association 95(12), 105-119.
62. Kruithof, J. C., Kamp, P. C., Folmer, H. C., Nederlof, M. M., and van Hoof, S. C. J. M. (2001). Development of a membrane integrity monitoring strategy for the UF/RO Heemskerk drinking water treatment plant. Water Science and Technology: Water Supply 1, 261-271.
63. Laine, J. M., Glucina, K., Chamant, M., and Simonie, P. (1998). Acoustic sensor: A novel technique for low pressure membrane integrity monitoring. Desalination 119, 73-77.
64. Lake, R., Oxtoby, S., Burke, T., Leparc, J., and Mysore, C. (2003). An absolute barrier to Cyrptosporidium: A British approach. Paper presented at the AWWA membrane technology conference, Atlanta, Georgia.
65. Landsness, L. B. (2001). Accepting MF/UF technology - making the final cut. Paper presented at the American Water Works Association Membrane Technology Conference, San Antonio, Texas.
66. Langlet, J., Gaboriaud, F., Duval, J. F., and Gantzer, C. (2008a). Aggregation and surface properties of F-specific RNA phages: Implication for membrane filtration processes. Water Research 42, 2769-2777.
67. Langlet, J., Gaboriaud, F., and Gantzer, C. (2007). Effects of pH on plaque forming unit counts and aggregation of MS2 bacteriophage. Journal of Applied Microbiology 103, 1632-1638.
68. Langlet, J., Gaboriaud, F., and Gantzer, C. (2008b). Impact of chemical and structural anisotropy on the electrophoretic mobility of spherical soft multilayer particles: The case of bacteriophage MS2. Biophysical Journal 94, 3293-3312.
69. Langlet, J., Ogorzaly, L., Schrotter, J. C., Machinal, C., Gaboriaud, F., Duval, J. F. L., and Gantzer, C. (2009). Efficiency of MS2 phage and Q[beta] phage removal by membrane filtration in water treatment: Applicability of real-time RT-PCR method. Journal of Membrane Science 326, 111-116.
70. Lee, J. H., Hong, S. K., Hur, H. C., and Choi, Y. J. (2009). Improvement of the resolution in direct membrane integrity test by controlling solution surface tension. Water Science and Technology 2205-2211.
71. Lohwacharin, J., and Takizawa, S. (2009). Effects of nanoparticles on the ultrafiltration of surface water. Journal of Membrane Science 326, 354-362.
72. Lovins, W. A., Taylor, J. S., and Hong, S. K. (2002). Micro-organism rejection by membrane systems. Environmental Engineering Science 19, 453-465.
73. Lozier, J., Kitis, M., Colvin, C., Kim, J., Mi, B., and Mariñas, B. (2004). Microbial removal and integrity monitoring of high-pressure membranes. London, England: IWA.
74. Lytle, C. D., and Routson, L. B. (1995). Minimized virus binding for tests of barrier materials. Applied and Environmental Microbiology 61, 643-649.
75. Madireddi, K., Babcock, Jr, R. W. et al. (1997). Wastewater reclamation at Lake Arrowhead, California: An overview. Water Environment Research 69, 350-362.
76. Matsui, Y., Matsushita, T., et al. (2003). Virus removal by ceramic membrane microfiltration with coagulation pretreatment. Water Supply 3(5), 93-99.
77. Matsushita, T., Matsui, Y., Inoue, T., Yamamoto, M., Hayashl, Y., Yonekawa, H., and Tsutsumi, Y. (2004). Irreversible and reversible adhesion between virus particles and hydrolyzing-precipitating aluminium: A function of coagulation. Water Science and Technology 50(12), 201-206.
78. Matsushita, T., Matsui, Y., and Shirasaki, N. (2006). Analysing mass balance of viruses in a coagulation - Ceramic microfiltration hybrid system by a combination of the polymerase chain reaction (PCR) method and the plaque forming units (PFU) method. Water Science and Technology 53(7), 199-207.
79. Matsushita, T., Matsui, Y., Shirasaki, N., and Kato, Y. (2005). Effect of membrane pore size, coagulation time, and coagulant dose on virus removal by a coagulationceramic microfiltration hybrid system. Desalination 178, 21-26.
80. Moulin, P. (2007). French Patent No. EP1862791 (A2). Paris: European Patent Office.
81. Naismith, J. (2005). Membrane integrity: Direct turbidity measurement of filtrate from MF membrane modules at an operating potable water treatment plant. Desalination 179, 25-30.
82. Ogorzaly, L., and Gantzer, C. (2006). Development of real-time RT-PCR methods for specific detection of F-specific RNA bacteriophage genogroups: Application to urban raw wastewater. Journal of Virological Methods 138, 131-139.
83. Otaki, M., Yano, K., and Ohgaki, S. (1998). Virus removal in a membrane separation process. Water Science and Technology 37(10), 107-116.
84. Ottoson, J., Hansen, A., Björlenius, B., Norder, H., and Stenström, T. A. (2006). Removal of viruses, parasitic protozoa and microbial indicators in conventional and membrane processes in a wastewater pilot plant. Water Research 40, 1449-1457.
85. Overby, L. R., Barlow, G. H., Doi, R. H., Jacob, M., and Spiegelman, S. (1966). Comparison of two serologically distinct ribonucleic acid bacteriophages. I. Properties of the viral particles. Journal of Bacteriology 91, 442-448.
86. Oxtoby, S. (2003). Experiences in integrity testing ultrafiltration membranes at a large potable water treatment works. Water Science and Technology: Water Supply 3, 1-7.
87. Panglisch, S., Deinert, U., Dautzenberg, W., Klepke, O., and Gimbel, R. (1998). Monitoring the integrity of capillary membranes by particle counters. Desalination 119, 65-72.
88. Penrod, S. L., Olson, T. M., et al. (1995). Whole Particle Microelectrophoresis for Small Viruses. Journal of Colloid and Interface Science 173, 521-523.
89. Phattaranawik, J., Fane, A. G., and Wong, F.-S. (2007). Detection apparatus and method utilizing membranes and ratio of transmembrane pressures. WO/2007/ 129994. Geneva, Switzerland: World Intellectual Property Organisation.
90. Phattaranawik, J., Fane, A. G., and Wong, F.-S. (2008). Novel membrane-based sensor for online membrane integrity monitoring. Journal of Membrane Science 323, 113-124.
91. Pontius, F. W., Amy, G. L., and Hernandez, M. T. (2009). Fluorescent microspheres as virion surrogates in low-pressure membrane studies. Journal of Membrane Science 335, 43-50.
92. Pressdee, J. R., Veerapaneni, S., Shorney-Darby, H. L., van der Hoek, J. P., and Clement, J. A. (2006). Integration of membrane filtration into water treatment systems. West Conshohocken, PA, and Washington, DC: AWWA Research Foundation and U.S. Department of the Interior, Bureau of Reclamation.
93. Prevelige, P. E., King, J., and Silva, J. L. (1994). Pressure denaturation of the bacteriophage P22 coat protein and its entropic stabilization in icosahedral shells. Biophysical Journal 66, 1631-1641.
94. Rajagopalan, N., Sanford, R. A., et al. (2006). U.S. Patent No. 7,011,758. Washington, DC: U.S. Patent and Trademark Office.
95. Randles, N. (1997). Large scale operating experience in membrane systems for water and waste water reclamation. Desalination 108, 205-211.
96. Sakoda, A., Sakai, Y., Hayakawa, K., and Suzuki, M. (1997). Adsorption of viruses in water environment onto solid surfaces. Water Science and Technology 35, 107-114.
97. Schijven, J. F., and Hassanizadeh, S. M. (2000). Removal of viruses by soil passage: Overview of modeling, processes, and parameters. Critical Reviews in Environmental Science and Technology 30(1), 49-127.
98. Shields, P. A., and Farrah, S. R. (1987). Determination of the electrostatic and hydrophobic character of enteroviruses and bacteriophages. Paper presented at the 87th Annual Meeting on American Society of Microbiology, Washington, DC.
99. Shirasaki, N., Matsushita, T., Matsui, Y., Kobuke, M., and Ohno, K. (2009a). Comparison of removal performance of two surrogates for pathogenic waterborne viruses, bacteriophage Q[beta] and MS2, in a coagulation-ceramic microfiltration system. Journal of Membrane Science 326, 564-571.
100. Shirasaki, N., Matsushita, T., Matsui, Y., and Ohno, K. (2008). Effects of reversible and irreversible membrane fouling on virus removal by a coagulation-microfiltration system. Journal of Water Supply: Research and Technology - AQUA 57, 501-506.
101. Shirasaki, N., Matsushita, T., Matsui, Y., Ohno, K., and Kobuke, M. (2007). Virus removal in a hybrid coagulation-microfiltration system: Investigating mechanisms of virus removal by a combination of PCR and PFU methods. Water Science and Technology: Water Supply 7, 1-8.
102. Shirasaki, N., Matsushita, T., Matsui, Y., Urasaki, T, and Ohno, K. (2009b). Comparison of behaviors of two surrogates for pathogenic waterborne viruses, bacteriophages Q[beta] and MS2, during the aluminum coagulation process. Water Research 43, 605-612.
103. Simonet, J., and Gantzer, C. (2006). Inactivation of poliovirus 1 and F-specific RNA phages and degradation of their genomes by UV irradiation at 254 nanometers. Applied and Environmental Microbiology 72, 7671-7677.
104. Sorber, C. A., Malina, J. F., and Sagik, B. P. (1972). Virus rejection by the reverse osmosis-ultrafiltration processes. Water Research 6, 1377-1388.
105. Tate, C. H., and Trussell, R. R. (1978). Use of particle counting in developing plant design criteria. Journal of the American Water Works Association 70, 691-698.
106. Templeton, M. R., Andrews, R. C., and Hofmann, R. (2008). Particle-associated viruses in water: Impacts on disinfection processes. Critical Reviews in Environmental Science and Technology 38, 137-164.
107. Trimboli, P., Lozier, J., and Johnson, W. (2001). Demonstrating the integrity of a large scale microfiltration plant using a Bacillus spore challenge test. Water Science and Technology: Water Supply 1, 1-12.
108. Urase, T., Yamamoto, K., and Ohgaki, S. (1993). Evaluation of virus removal in membrane separation processes using coliphage Qβ. Water Science and Technology 28, 9-15.
109. Urase, T., Yamamoto, K., and Ohkagi, S. (1994). Effect of pore size distribution of ultrafiltration membranes on virus rejection in crossflow conditions. Water Science and Technology 30, 199-208.
110. Urase, T., Yamamoto, K., and Ohkagi, S. (1996). Effect of pore structure of membranes and module configuration on virus retention. Journal of Membrane Science 115, 21-29.
111. U.S. Department of the Interior. (2001). Methods of monitoring the integrity of reverse osmosis and nanofiltration membarne systems. Desalination and Water Purification Program report 55. Washington, DC: U.S. Department of the Interior.
112. U.S. Environmental Protection Agency. (2001). Low pressure membrane filtration for pathogen removal: Application, Implementation and regulatory issues. EPA 815-C-01-001.
113. U.S. Environmental Protection Agency. (2005). Membrane filtration guidance manual. EPA.815-R-09-009.
114. U.S. Environmental Protection Agency. (2006). National primary drinking water regulations: Long term 2 enhanced surface water treatment rule. Final Rule, 40 CFR parts 141 and 142, 71 (3), 653.
115. Van Hoof, S. C. J. M., Broens, L., Nahrstedt, A., Panglisch, S., and Gimbel, R. (2003). Development of a new integrity testing system. Water Science and Technology: Water Supply 3, 101-108.
116. van Voorthuizen, E. M., Ashbolt, N. J., and Schäfer, A. I. (2001). Role of hydrophobic and electrostatic interactions for initial enteric virus retention by MF membranes. Journal of Membrane Science 194, 69-79.
117. Walsh, M. E., Chaulk, M. P., and Gagnon, G. A. (2005). Indirect integrity testing on a pilot-scale UF membrane. Journal of Water Supply: Research and Technology - AQUA 54, 105-114.
118. World Health Organization. (2008). Plan of work for the rolling revision of the WHO Guidelines for Drinking water quality. Retrieved October 6, 2009, from http://www.who.int/watersanitationhealth/gdwqrevision/en/index.html
119. Zheng, X., and Liu, J. X. (2006). Mechanism investigation of virus removal in a membrane bioreactor. Water Science and Technology: Water Supply 6, 51-59.
120. Zhu, B., Clifford, D. A., and Chellam, S. (2005a). Comparison of electrocoagulation and chemical coagulation pretreatment for enhanced virus removal using microfiltration membranes. Water Research 39, 3098-3108.
121. Zhu, B., Clifford, D. A., and Chellam, S. (2005b). Virus removal by iron coagulation micro filtration. Water Research 39, 5153-5161.