This presentation provides several methods to calculate sensitivity for pressure-based integrity testing. The key is to relate the log reduction value (LRV) to the parameters integrity testing. An example calculation using the spreadsheet based on an actual membrane system is presented. The calculated result is compared with the measured LRV value...

This PowerPoint gives a review of the basics of microfiltration and ultrafiltration process technology and a review of the processes....

This PowerPoint presents the basics and terminology of microfiltration and ultrafiltration membrane technology...

Discusses key applications of microfiltration in mining, background on mine water treatment, key drivers and water chemistry. Includes case study on implementation of MF for mine water treatment....

This paper discusses fatigue testing on polymeric membranes are made of high molecular-weight polymers. One approach is accelerated fatigue test where the testing conditions are closely resemble to those used in actual operating conditions with a much accelerated pace. The paper concludes that properly designed fatigue test is considered the best a...

Autopsy studies of MF/UF membranes to evaluate wear and tear and the possibility of integrity failures after long use....

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This paper presents several case studies to illustrate the complexity of low pressure membrane fouling in real world applications. By correlating the recovery in membrane permeability to specific cleaning step, as well as the quantity of contaminants on the membrane surfaces, the cause for fouling could be elucidated and the most effective cleanin...

Over the last 15 years, low pressure membrane systems have continued to evolve and are now the preferred treatment technology for many water applications. New membrane materials, system design, and operational improvements have enhanced customer confidence and have solidified the positioning of membranes in this market. Industry discussions on the ...

There is an ever-growing demand for fresh water from the Central and West Coast Basin aquifers serving the Los Angeles area. Beginning in 2005 and continuing today, the Leo J Vander Lans Advanced Water Treatment Facility (LVLWTF) was built to recycle tertiary-treated wastewater into a very high quality water that is injected to prevent saltwater in...

Membrane fouling is ubiquitous and has a significant impact on the operation of membrane plants. Although the impact of fouling may be mitigated via the modification of pretreatment processes, inefficient cleaning can affect the extent of irreversible permeability loss, leading to the premature replacement of membranes. The challenges of having eff...

The abstract describes the content of a paper that analyzes economic factors between running membranes beyond their useful life (if the membrane is still operational) and the cost of new membranes. It reviews the costs of operating membranes, including additional chemical cleanings, and the largest power costs. The decision, especially by a municip...

Membrane fouling caused by iron or the combination of iron and organic matter is very common operating issue in membrane plants. Iron species in natural water can be dissolved, via incomplete oxidation and/or precipitation, as well as metal-NOM complexation, both may cause the loss in membrane permeability and/or difficulties in cleaning. The chemi...