Archives :: Processing & Handling :: Separation (Liquid-Liquid & Gas-Liquid) :: Membranes

Displaying 21 - 40 of 57 stories.
March 28, 2011
The Model 740 Membrane Test System (MTS) is the first commercial instrument designed specifically for measurement of the through-thickness resistance and conductivity of ionomer and polymer electrolyte...
March 28, 2011
Siemens Water Technologies The Petro membrane bioreactor (MBR) system (photo) has been specially designed for the petroleum, petrochemical and other chemical process industries (CPI). It is a wastewater treatment process that combines various biological treatment processes with an integrated...
March 28, 2011
The Puron Plus membrane bioreactor (MBR) system is a skid-mounted packaged plant that provides customers with a full scope of supply from prescreening and biological treatment through to the final membrane...
March 28, 2011
Elga Process Water This firm’s new range of membrane plants for the surface-treatment industries feature CeraMem industrial strength membranes (photo). Compared to conventional...
February 1, 2010
Researchers from the Center for Membrane Technology, Beijing University of Technology (China; have developed a new spiral-wound membrane module for use in oxygen-enriched combustion. A pilot-scale system with five membrane modules has been built and tested in a 4-ton, oil-fired boiler. According to the Center’s director, professor Shulan Ji, the fuel required to generate one 1 GJ...
October 6, 2009
The special group "Water and Wastewater Technology" of the German Process Plant and Equipment Association (VDMA; Frankfurt, Germany; has released a new VDMA Specification on prevention and reduction of scaling and fouling in membrane plants. The objective of this VDMA Specification is to help to ensure that measures are taken to prevent and reduce scaling and fouling when planning...
July 1, 2009
Advanced Membrane Technologies and Applications Edited by Norman N. Li. Wiley. 111 River St., Hoboken, NJ 07030. Web: 2008. 994 pages. $150.00. Reviewed by Peter S. Cartwright, Cartwright Consulting Co., Minneapolis, Minn. The crossflow-pressure-driven membrane separation technologies of microfiltration, ultrafiltration, nanofiltration and reverse osmosis have been commercially available for...
July 1, 2009
The Electric Power Research Institute (EPRI, Palo Alto, Calif.; has signed an agreement with Air Products (Allentown, Penn.; to support the company’s development of a ceramic ion transport membrane (ITM) for air separation. The membrane is being tested and scaled up under a cooperative agreement with the U.S. Dept. of Energy (DOE, Washington D.C....
July 1, 2009
“When you improve the efficiency or capacity of a product, it almost always can be used to improve the process economics with respect to investment costs or operating costs,” says Mark Pilling, manager of technology with Sulzer Chemtech (Tulsa, Okla.). To help processors do this, separation-technology providers strive to maintain a strong base of engineering expertise to assist customers in...
March 1, 2009
Membrane polymers are packaged into a configuration, commonly called a device or an element. The most-common element configurations (figure) are tubular, capillary fiber, spiral wound, and plate and frame. Tubular Made from ceramic, carbon, stainless steel or a number of thermoplastics, tubular elements have inside diameters from ¼ in. up to about 1 in. Typically, the membrane is coated on the...
February 12, 2009
CeraMem ceramic membranes are a proprietary technology platform provides ceramic membrane performance at comparable lifecycle costs to polymeric membranes. The design, which is a combination of unique materials of...
February 12, 2009
Septron Bio-Safe is said to be the world’s first electro-deionization (EDI) module with an integrated membrane stage. It is based on proven and patented spiral-wound technology and has an additional membrane stage for removal of...
January 1, 2009
For wastewater treatment, membrane bioreactors (MBRs) provide superior effluent quality in a small footprint compared to alternative activated-sludge treatment methods. However, MBRs are prone to fouling, and thus may require frequent membrane cleaning with the associated manpower and chemical costs. Microdyn-Nadir GmbH (Wiesbaden;, in cooperation with Darmstadt University (both...
January 1, 2009
Solvay Solexis S.p.A. (Bollate, Italy; has commercialized a new perfluorosulfinic acid (PFSA) polymer, tradenamed Aquivion, which was specifically designed for polymer electrolyte membrane (PEM) fuel cells. Aquivion ionomer...
December 1, 2008
A new membrane is combined with a novel process design to reduce energy costs in a CO2 recovery system developed by Membrane Technology and Research Inc. (MTR, Menlo Park, Calif.; The two-step system uses a membrane made of a hydrophilic rubbery polymer, formed into spiral-wound modules. The membrane is 10 times more permeable to CO2 than conventional membranes used for CO2, says...
September 15, 2008
The need to conserve water is becoming a common concern throughout the world. Whether this is due to the cost of water, availability of water, or environmental concerns, water conservation is becoming a major focal point, both in the public and private sector. In those areas where renewable water resources are limited, and in regions where there are significant environmental concerns and costs associated...
August 15, 2008
Market demand for water purification is driving reverse osmosis forward Increasingly, water has become one of the hottest topics of the decade. Estimates indicate that water usage has increased tenfold in the last ten years. A recent United Nations report noted that one third of the world’s population lives in areas suffering from water shortages. Furthermore, industrial demands for water are...
July 15, 2008
Monitoring Our Atmosphere Please refer to the Editor’s Page, April 2008: Mr. Gerald Ondrey’s last sentence sums it up. "Ultimately, the only truly green solution is to reduce consumption — the second law of thermodynamics says so." Rep. Roscoe Bartlett (R, Md.) speaks out plain and clear regarding energy policy, but colleagues respond politically and not...
March 15, 2008
Separation by a membrane is achieved by creating a boundary between different bulk gas or liquid mixtures. As different solvents and solutes flow through a membrane at different rates, separation is achieved. Here, we will focus on three filtration techniques: microfiltration (MF), ultrafiltration (UF) and nanofiltration (NF). These processes are characterized by the size of the particle that can be...
March 15, 2008
Although nanoporous silica membranes are promising systems for the molecular separation of gases and liquids, they lack microstructural stability in the presence of water at temperatures as low as 60°C. Prolonged exposure to water causes hydrolysis, resulting in the formation of large, non-selective pores and cracks in the membrane. On the other hand, polymeric membranes are less prone to damage by...
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