Membrane services
CH2M Hill offers a full spectrum of design, construction and operating services in the application of membrane processes for water and wastewater treatment clients. Its staff of engineers, scientists, planners and economists can provide planning, study, design, costing and bidding of both low (microfiltration and ultrafiltration) and high (nanofiltration and reverse osmosis) pressure processes as well as electrodialysis.
CH2M Hill
Greenwood Village, CO
Tel: 303-771-0900
Web: www.ch2m.com
Microfiltration system
Aria Membrane Microfiltration systems from Pall are designed for drinking water filtration in municipalities with populations of 10,000 or less. The systems are skid-mounted, fully automated and self-contained to facilitate installation. Once programmed, the system will run unattended at a constant clean water production rate. The systems use Pall Microza microfiltration modules to provide drinking water purified to levels exceeding EPA's Surface Water Treatment Rule.
Pall Corp.
East Hills, NY
Tel: 516-484-5400
Web: www.pall.com
Membrane bioreactor
The USFilter Immersed Membrane Bioreactor system is a single-sludge activated treatment process, designed to handle liquid/solids separation on a molecular scale. This process represents the union of two of the company's technologies: USFilter Memcor Products, with years of experience in membrane systems, and Jet Tech Products, which provides wastewater treatment systems for municipal applications worldwide.
USFilter Jet Tech Products
Edwardsville, KS
Tel: 913-422-7600
Web: www.usfilter.com
Ultrafiltration membranes
Ondeo Degremont's Aquasource ultrafiltration membrane system was developed specifically for drinking water treatment. With a 0.01 micron pore size, the hollow fiber membranes provide finished water that is guaranteed to test less than 0.1 NTU in permeate turbidity and to be free of all pathogens, including bacteria, cryptosporidium, giardia and viruses.
Ondeo Degremont Inc.
Richmond, VA
Tel: 804-756-7600
Screening systems
Brackett Green offers Dual Flow and Central Flow screens with fine mesh sizes of 1 to 3 mm. The screens allow zero debris carry-over and seals prevent bypassing of debris, which can improve the performance of membrane filtration systems. The company also manufactures a patented mesh for wastewater filtration commonly referred to as the ProPaPanel® as it is the proper panel to use for wastewater filtration. The filter avoids hair pinning or stapling of fibrous material that fouls perforated plate, wedge wire and woven wire mesh.
Brackett Green USA, Inc.
Houston, TX
Tel: 281-480-7955
Web: www.bgusa.com
Water treatment systems
A2 Water Process offers a team of engineers, equipped with the latest innovations in water treatment, to design a practical water treatment program to meet specific needs. Its line of products, from pre-treatment to complete reverse osmosis systems, are tailored to address water treatment needs in a cost effective way. The company offers a variety of membrane, ion exchange and filtration technologies. It also offers a wastewater evaporation system.
A2 Water Process
Gregory, TX
Tel: 361-777-3234
Web: www.a2water.com
Membrane systems
Norit Americas is now offering membranes and membrane systems in addition to its activated carbon line. Its X-Flow brand of ultrafiltration membranes is already being used in the largest ultrafiltration membrane system application in the world. The hollow fiber membranes provide excellent removal of bacteriological, cryptosporidia and giardia contamination from public drinking water supplies.
Norit Americas Inc.
Atlanta, GA
Tel: 404-256-6150
Web: www.norit-americas.com
Low fouling membrane
Hydranautics has introduced the new LFC3 low fouling membrane technology. The new membrane uses the same hydrophilic chemistry of the LFC1 (low fouling composite) membrane, but meets the requirements of high salt rejection applications. The LFC3 combines low fouling membrane chemistry with high efficiency flow and rejection characteristics, offering 99.6% salt rejection at 9,500 gpd. This membrane is suited for the treatment of difficult feedwaters which up to now required significant pretreatment prior to subjecting them to any composite RO membrane.
HydranauticsOceanside, CA
Tel: 760-901-2529
Web: www.hydranautics.com
Chlorine resistant membranes
USFilter has incorporated an intermediate packing density chlorine resistant membrane to its Memcor® CMF-S and Memcor® CMF systems. The Polyvinylidene Fluoride (PVDF) membrane is an oxidant tolerant material. Use of the material allows for pre-oxidized feeds, filtration of feeds containing high iron or manganese, or coagulated feed when a ferric-based coagulant is specified.
USFilter Memcor Products
Sturbridge, MA
Tel: 800-547-1202
Web: www.usfilter.com
Membrane filter monitor
O'Keefe Electronics has developed the Intelligent Membrane Monitor and Manager (im3). The new monitor is designed to increase membrane life, reduce operating costs, increase system efficiency, and reduce labor. One of the greatest concerns in membrane filter operations is the failure to clean the membrane on a routine basis. The result is reduced life for the membranes as they deteriorate prematurely and are damaged beyond repair. The im3 monitors permeate flow and notifies operators when a membrane should be cleaned. Once the membrane is cleaned, the monitor determines when it should be placed back into service.
O'Keefe Electronics Inc.
Wellington, OH
Tel: 440-647-5193
Web: http://members.tripod.com/oei0/
Immersed membrane filtration
The ZeeWeed® immersed membrane filtration system from Zenon is ideal for reverse osmosis pretreatment. It consistently yields a silt density index (SDI) less than 3, regardless of the influent total suspended solids (TSS) and SDI. Through an enhanced coagulation process, the system also reduces raw water total organic carbon (TOC) up to 90%, further improving the performance of the RO system.
Zenon Environmental Inc.
Oakville, Ontario, Canada
Tel: 905-465-3030
Web: www.zenonenv.com
Membrane maintenance
BetzDearborn offers products and services designed to improve performance of membrane treatment systems. Chemical treatment capabilities include membrane compatible cleaners, biological control products, scale inhibitors, filtration aids, deposit control agents, dechlorinators, coagulants and flocculants. The company also offers a diagnostic software program to help reverse osmosis users with the correct selection and dosage of antiscalants and cleaners.
BetzDearborn
Trevose, PA
Tel: 215-953-5524
Web: www.betzdearborn.com
Membrane bioreactor
Enviroquip has introduced a membrane bioreactor (MBR) that reduces plant footprint, produces quality effluent, and requires little maintenance. By operating at MLSS concentrations between 15,000 and 30,000 mg/L, the footprint of a conventional plant is often reduced by 50% or more. Classified as microfiltration, the average membrane pore size is 0.4 microns. However, the formation of a thin biofilm reduces the effective pore size to 0.1 microns, generally resulting in six-log bacteria removal.
Enviroquip, Inc.
Austin, TX
Tel: 512-834-6000
Web: www.enviroquip.com
Pre-filtration systems
Filtronics has introduced EM-Pure membrane systems designed with Hyper-Filtration pre-filtration. The systems consist of membrane selections which carry ANSI 58 and California Department of Health Services approvals. Systems for municipal drinking water applications include ultra-filtration for surface water treatment and groundwater under the influence. They feature over a 5 log removal of pathogens, including giardia, cryptosporidium, viruses and bacteria, exceeding the requirements of SWTR, USEPA and DWI regulations. The pre-filtration units substantially reduce the requirements for membrane cleaning and reduce outputs from high turbidity raw water spikes during rainy or high run-off periods.
Filtronics, Inc.
Anaheim, CA,
Tel: 714-630-5040
Web: www.filtronics.com
Membrane filtration
Ondeo Nalco Company has formed the PermaCare Membrane Separations Group to focus on developing and supporting the PermaCare range of products and services used to enhance RO, NF, UF and MF applications. The product family comprises threshold antiscalants to maximize plant recovery, cleaners to restore the performance of fouled membranes and bio-control agents to combat and control biological fouling. The company also offers a range of specialist services that include membrane autopsy to identify the cause of performance loss and the design and testing of custom cleaning programs that target site specific foulants.
Ondeo Nalco Municipal
Naperville, IL
Tel: 877-589-6657
Web: www.OndeoNalcoMunicipal.com
Membrane filter systems
F.B. Leopold Company's Ultrafiltration Membrane Filter Systems are available to treat a variety of influents in applications including surface water, ground water under the influence of surface water, spent filter backwash recovery, pretreatment to other membrane systems and tertiary wastewater treatment. Using Hydranautic's HYDRAcap® membranes, the systems remove a wide range of colloidal matter and pathogens, including Giardia, Cryptosporidium and other microorganisms.
F.B. Leopold Company, Inc.
Zelienople, PA
Tel: 724-452-6300
Web Site www.fbleopold.com
Scale inhibitor
American Water Chemicals offers its A-102 Plus antiscalant, which inhibits inorganic scale formation and disperses iron and insoluble silica precipitation in membrane separation processes. Sulfuric acid pretreatment can be eliminated in most cases when the product is used. Calcium carbonate scaling can be controlled up to a +2.6 concentrate LSI by an average dosage of 1 to 4 mg/L of the product. A-102 Plus is ANSI/NSF Standard 60 certified and approved by major membrane manufacturers.
American Water Chemicals Inc.
Tampa, FL
Tel: 813-246-5448
Web: www.amh2ochem.com
Membrane contactors
Celgard Inc. has announced the commercialization of Liqui-Cel® 6 x 28 Membrane Contactors. The contactors are primarily used for adding or removing O2, CO2 and N2 to or from water. The new contactor is the only integrally potted membrane contactor device manufactured in this large of a diameter. The integral potting has allowed the elastomeric o-ring seals to be eliminated. The contactor is designed to handle flow rates of 5-50 gpm in a single unit. Larger flow rates can be accommodated by piping multiple devices in parallel. The contactors are rated to 105 psig at 77 degrees F. The membrane cartridge is integrally potted into ABS and the contactors are manufactured with FDA compliant materials.
Celgard Inc.
Charlotte, NC
Tel: 704-587-85496
