Membrane Filter Articles on Environmental XPRT

On PM 2.5 Filters, Let’s just clear the air between us; ok?

In the area of a former military building complex in the Chaoyang District of Beijing is a unique and thriving artistic community. In the middle of this art district, is a strange 7-meter tall tower shaped like an avant-garde metallic pineapple. Designed by Dutch artist Daan Roosegaarde, it is both an artistic creation and a functional tool meant to test a possible solution for ...

Jun. 13, 2017

By Sterlitech Corporation

Focus on Microfiltration Part 3: Extending Service Life Using Prefiltration

Last month we examined filter selection strategies for maximizing service life in continuous use applications. In this 3rd installment, we will examine the use of prefilters to extend service life. Clarifying liquids with high levels of suspended solids is challenging, especially for applications requiring submicron filtration. In these applications, filter users who experience ...

Jun. 13, 2017

By Sterlitech Corporation

Assessment of a membrane drinking water filter in an emergency setting

The performance and acceptability of the NeroxTM membrane drinking water filter were evaluated among an internally displaced population in Pakistan. The membrane filter and a control ceramic candle filter were distributed to over 3,000 households. Following a 6-month period, 230 households were visited and filter performance and use were assessed. Only 6% of the visited households still ...

Jun. 8, 2015

By IWA Publishing

A Membrane Pretreatment Technology

Nearly all membrane systems, no matter what their raw water source, must utilize some form of pretreatment to remove unwanted organic and inorganic suspended solids. Bag and cartridge filters are efficient at removing suspended solids but must be replaced on a frequent and often costly basis. Some form of suspended solids removal system that cleans itself, maintains high flow rates and stays ...

Jan. 12, 2004

By Amiad Filtration Systems Ltd.

Air filtration applications for membranes

Given their unique performance attributes membranes are finding use in a growing number of high efficiency air filtration applications. One example is in respirators and personal protective equipment. Applications where intense physical demands and risk of exposure to harmful contaminants are present demand the high efficiency / low pressure drop combination of expanded polytetrafluoroethylene ...

Jul. 28, 2011

By American Filtration & Separations Society

Particle counting as a tool to predict filterability in membrane bioreactors activated sludge?

Activated sludge quality is one of the major factors influencing flux decline in membrane bioreactors (MBRs). Sludge filterability is a recognized parameter to characterize the physical properties of activated sludge. Decrease in filterability is linked to a higher number of submicron particles. In our present research we studied whether particle counting techniques can be used to indicate ...

Jan. 1, 2011

By IWA Publishing

Working on a Love/Hate Relationship with the Surface Chemistry of Membrane Filters

Water, oils, and solvents sometimes need to be filtered. But when you see filters labeled as hydrophilic, hydrophobic, and now oleophobic; what does all this mean? Sterlitech currently offers membrane disc and sheet filters in 10 different polymer types and 4 inorganic filters. 2 of the polymer types are subdivided into 4 subgroups based on surface ...

Jun. 12, 2016

By Sterlitech Corporation

Ceramic membranes for water treatment

Ceramic membranes, different in pore size and membrane material, were applied to remove particulate and dissolved matter from different spent filter backwash water types as well as from dam water. The study was conducted in pilot scale under conditions typical for waterworks at a dam water treatment plant. A comparison of different ceramic membranes implied that total membrane resistance was more ...

Jan. 1, 1900

By IWA Publishing

Recycling of spent filter backwash water using coagulation-assisted membrane filtration: effects of submicrometre particles on membrane flux

Membrane separation technology has been widely used for recycling of spent filter backwash water (SFBW) in water treatment plant. Membrane filtration performance is subject to characteristics of the particles in the SFBW. A bench-scale microfiltration (MF) coupled with pre-coagulation was set up to evaluate the recovery efficiency of SFBW. Effect of particle size distribution and zeta potential ...

Apr. 1, 2010

By IWA Publishing

Self-Cleaning Filters for Pretreatment of Membrane and UV Water Treatment Systems

The removal of suspended solids is necessary to protect membrane systems and prevent the “shadow effect” in ultraviolet (UV) treatment systems. Recent field data has shown the effectiveness of automatic self-cleaning filters in removing suspended solids down to less than 3 microns in size without flocculants, pre-coats or granulated media. Tests have demonstrated the complete removal of particles ...

Dec. 1, 2002

By Amiad Filtration Systems Ltd.

Micro-90 Effective Filter Membrane Cleaner for Wastewater Treatment Operations

The care and cleaning of filter membranes is essential to the success of many water treatment systems. International Products Corporation (IPC) manufactures a line of membrane cleaners effective at restoring 100% flux at safe pH ranges. One of IPC’s customers treats industrial wastewater generated by the engine plant of a major automotive ...

Nov. 15, 2015

By International Products Corporation

Benefits of membrane technology

For years, coagulation and flocculation, along with settling and granular media filtration, sand filters, and precoat filters using diatomaceous earth, have been the “standard” for removing contaminants from water sources. However, since the early 1990’s membrane filtration has gained momentum and is now considered mainstream technology for this purpose. Advances in material science and membrane ...

Jun. 1, 2008

By Pall Corporation

Membranes, the Finest Filtration

Introduction The notion that salt could be removed from seawater without a phase change took hold of Dr. Sourirajan's imagination in the late 1950's. The actual invention of the reverse osmosis (RO) membrane took place in his laboratory at UCLA around 1960. (Thus Sourirajan could be called not only the 'Father of Reverse Osmosis,' but the initiator of all crossflow membrane technology.) The full ...

Jan. 1, 1995

Treating Industrial Water with Membrane Technology

A variety of industries are finding that it makes sense to reevaluate the way they treat industrial process water, both to improve the quality of their products and increase the efficiency of their processes. Purification systems utilizing crossflow membrane filtration, such as reverse osmosis (RO), nanofiltration (NF) or ultrafiltration (UF) can be a good alternative to traditional filtration ...

Jan. 1, 1995

Simulation of particle capture in a microfiltration membrane

The present study takes an interest in the description of the fouling mechanisms by a numerical approach at the microscopic scale. At first, an X-ray tomography has enabled the modelling of the membrane structure for the numerical simulations. Next, for different particle size, a same volume of particles has been sent in the modelled membrane and the final permeability has been computed. Thus, ...

Jan. 1, 2011

By IWA Publishing

Ceramic membranes with higher abrasion resistance

High flux rates, combined with a very high chemical and thermal resistance and the resulting operational reliability - these are the reasons why users worldwide opt for ceramic membranes. Up to now, the only parameter where ceramic membranes performed well but not excellent was abrasion resistance. Therefore, filtering of abrasive matter required pre-treatment stages such as prefiltration, ...

Dec. 26, 2013

By atech innovations gmbh

Ceramic Membranes in Sludge Thickening Applications

The Aerobic Digestion group has recently been conducting pilot testing of silicon carbide ceramic membranes manufactured by the Danish company Cembrane A/S. This promising technology shows a great ability to filter water even in the challenging high solids environment of sludge thickening. The results of the pilot testing have led the aerobic digestion group to utilize ...

Dec. 6, 2016

By Ovivo (Formerly Eimco Water Technologies)

MEDIA FILTRATION, MEMBRANES, OZONE, AND UV

ABSTRACT For reclaimed water disinfection, pathogen reduction to acceptable public health risk levels is theprimary objective. A second emerging objective is the ability to destroy trace pollutants(endocrine disrupters (EDCs), pharmaceutically active compounds (PhACs)) at a reasonably lowcost.The WateReuse Foundation’s Innovative Reclaimed Water Treatment Project ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Dynamic Mathematical Modeling of Membrane Fouling in Submerged Membrane Bioreactors

ABSTRACTA mathematical model is developed that accounts for internal fouling of membranes due to soluble microbial products during subcritical flux operation, and for supercritical flux fouling due to cake formation and compression.. The model takes into account the filtration effect generated by the cake. A set of differential equations is derived and solved numerically to obtain a description ...

Oct. 22, 2006

By Water Environment Federation (WEF)

VSEP replaces crossflow membrane systems, filtering industrial wastewater at pulp and paper mills

Technological advances in membrane filtration systems have created an opportunity for pulp and paper mills to treat effluent streams in order to meet stricter environmental constraints. “Vibratory Shear Enhanced Processing” or VSEPÔ, developed by New Logic International makes it possible to filter effluent streams without the fouling problems exhibited by conventional membrane systems. The VSEP ...

May 31, 2007

By New Logic Research, Inc.

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