Improving membrane integrity monitoring indirect methods to reduce plant downtime and increase microbial removal credit

Crozes, Gil; Sethi, Sandeep; Mi, Baoxia; Curl, Jason; Mariñas, Benito J.

doi:10.1016/s0011-9164(02)00787-7

Cited by 26 publications

(8 citation statements)

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“…The detailed methodology for performing most these tests has been described in membrane fi ltration guidance manuals and ASTM standards (USEPA, 2005;ASTM, 2006ASTM, , 2008. These techniques have been discussed in detail and reviewed by researchers (Antony et al, in press;Crozes et al, 2002;Sethi et al, 2004;Guo et al, 2010).…”

Section: Membrane Integrity Monitoring Testsmentioning

confidence: 99%

Degradation of polymeric membranes in water and wastewater treatment

Antony

Leslie

2011

Advanced Membrane Science and Technology for Sustainable Energy and Environmental Applications

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Section: Membrane Integrity Monitoring Testsmentioning

confidence: 99%

Degradation of polymeric membranes in water and wastewater treatment

Antony

Leslie

2011

Advanced Membrane Science and Technology for Sustainable Energy and Environmental Applications

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“…In reality, however, NF and RO membranes are not complete barriers to these contaminants [ 6 ] and over time the integrity of membrane systems may be compromised due to a range of breaches that can develop in the system. Membrane breaches can occur as a result of: damage to the membrane layer as a result of chemical or biological degradation and particulate abrasion; delamination of the skin layer from the supporting layer; telescoping; and failures of O-rings, gaskets, connectors and other fittings [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. In addition to these ‘in service’ failure modes, manufacturing defects such as incomplete glue-lines can affect the integrity of membrane elements and depending on the quality control processes employed, these are usually detected before membranes are shipped to customers.…”

Section: Introductionmentioning

confidence: 99%

Current and Emerging Techniques for High-Pressure Membrane Integrity Testing

et al. 2018

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Ideally, pressure driven membrane processes used in wastewater treatment such as reverse osmosis and nanofiltration should provide a complete physical barrier to the passage of pathogens such as enteric viruses. In reality, manufacturing imperfections combined with membrane ageing and damage can result in breaches as small as 20 to 30 nm in diameter, sufficient to allow enteric viruses to contaminate the treated water and compromise public health. In addition to continuous monitoring, frequent demonstration of the integrity of membranes is required to provide assurance that the barrier to the passage of such contaminants is intact. Existing membrane integrity monitoring systems, however, are limited and health regulators typically credit high-pressure membrane systems with only 2 log10 virus rejection, well below their capability. A reliable real-time method that can recognize the true rejection potential of membrane systems greater than 4 log10 has not yet been established. This review provides a critical evaluation of the current methods of integrity monitoring and identifies novel approaches that have the potential to provide accurate, representative virus removal efficiency estimates.

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“…Nanofiltration is known to entail extra costs when introduced at a WTP, large initial investment and operation and maintenance costs follow, due to increased energy consumption and replacement of modules [10,[26][27][28]. From an environmental angle, compared to conventional treatments, and other newer treatment methods, the level of environmental impact from nanofiltration is highly dependent on the choice of settings [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Advanced NOM-Reduction by Hollow Fiber Ultrafiltration and Nanofiltration at a Swedish Surface Water Treatment Plant

Lidén

Persson

2016

Water

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Abstract:Membrane technology, i.e., ultrafiltration and nanofiltration, is growing in popularity, as it is a space efficient alternative for surface water treatment. Two types of hollow fiber membranes were tested in a fully equipped and automated pilot at a Swedish water treatment plant. Raw water was treated by a nanofilter and by coagulation before an ultrafilter. Operation parameters recorded during these trials have been the basis for cost estimations and assessments of environmental impact, comparing the two membrane modules to the existing conventional treatment. The membranes required lower chemical consumption, but led to increased costs from membrane modules and a higher energy demand. Compared to the existing treatment (0.33 €/m 3 ), the operational costs were estimated to increase 6% for ultrafiltration and 30% for nanofiltration. Considering the low emissions from Nordic energy production, the membrane processes would lower the environmental impact, including factors such as climate and ecosystem health. Greenhouse gas emissions would decrease from 161 g CO 2 -eq/m 3 of the existing process, to 127 g CO 2 -eq/m 3 or 83 g CO 2 -eq/m 3 for ultrafiltration and nanofiltration, respectively. Lower chemical consumption and less pollution from the sludge leaving the water treatment plant lead to lower impacts on the environment.

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Improving membrane integrity monitoring indirect methods to reduce plant downtime and increase microbial removal credit

Cited by 26 publications

References 0 publications

Degradation of polymeric membranes in water and wastewater treatment

Degradation of polymeric membranes in water and wastewater treatment

Current and Emerging Techniques for High-Pressure Membrane Integrity Testing

Feasibility Study of Advanced NOM-Reduction by Hollow Fiber Ultrafiltration and Nanofiltration at a Swedish Surface Water Treatment Plant

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