Reverse Osmosis Element Design

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Courtesy of Toray Membrane Europe

Introduction
 
TORAY REVERSE OSMOSIS MEMBRANE ELEMENTS are functional membrane elements with excellent quality and high performance developed with the polymer engineering expertise Toray has gained over the years. Toray Reverse Osmosis Membrane Elements are high rejection and high flux RO elements that have been meeting the high level requirements of our customers in many applications: ultrapure water production for semiconductor and other industries; seawater desalination; wastewater treatment; the recovery of valuable process materials in the food processing industry, etc. The wide-ranging line of products was first marketed in 1978.

Toray's membrane products are manufactured in two locations allowing for convenient global distribution. Toray's Ehime plant in Japan is both ISO9001 and ISO4001 certified. TMA's plant in Watertown, MA has achieved the National Sanitation Foundation (NSF) certification for their low-pressure brackish products.
 
Toray manufactures RO elements using second-generation automated rolling equipment developed by Toray Industries. The automatic winding of spiral wound elements provides a more durable, higher membrane surface area product versus traditional hand rolled elements. The RO elements manufactured are dimensionally compatible with all major membrane manufacturers providing easy upgrade and retrofit opportunities. The high quality (high rejection, high flow characteristics) of Toray's products make them ideally suited for use in applications such as municipal drinking water, seawater desalination and the production of ultra pure water for the semiconductor and power industries.
 
Toray RO Element Design
 
Toray manufactures two different membrane product lines: cross-linked polyamide composite membranes (TM and SU series) and asymmetrical cellulose acetate membranes (SC series).

TM Element series

The TM series of elements uses the close-coupled design (interior interconnector), which is the industry standard. This design allows for greater membrane surface area to be incorporated into the element, which leads to higher productivity and/or reduced operating pressures.

SC Element series
 
1. Spiral wound reverse osmosis elements which employ asymmetrical cellulose acetate membrane.
 
2. Stable performance and dependability are proven in a wide range of applications since first marketed in 1978.
 
3. Due to the non-charged membrane and unique element configuration, pretreatment can be carried out easily and fouling tendencies are reduced
 
4. The membranes can be used in a continuous chlorine sterilization process

Features and Quality of Toray Reverse Osmosis Membrane Elements
 
1. High rejection and high flux membrane
Both high rejection and high flux membranes are developed with Toray's extensive experience in polymer chemistry.
 
2. Choice in membrane material
Two types of membrane materials are available: thin film composite (TM and SU series) and cellulose acetate (SC series). Both membrane types are manufactured by Toray for use in a wide range of water treatment applications.
 
3. Used in many applications
With such a broad range of products, such as high salt rejection or ultra-low pressure elements, the optimum element can be selected for any application ranging from ultrapure process water to seawater desalination.
 
4. Experience
Toray was the first manufacturer of reverse osmosis membrane elements in Japan and has 25 years of experience in the application of numerous processes around the globe.
 
5. Complete service and support
Toray has established a complete service system to assist customers based on our extensive experience and technical data accumulated through many years and a variety of applications. Should any problem occur, appropriate technical support is readily available worldwide.
 
6. Stable quality guaranteed
Toray elements are manufactured under rigorous quality control procedures. Toray's Japanese membrane manufacturing factory has ISO-9001 and ISO 14001 certification from the Japan Quality Assurance Organization. Our U.S. manufacturing facility has received NSF inspection and certification on a number of products manufactured there.

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