Product Description

The TMy2oD-40o is a high-rejection, high-productivity, high chemical durability, and fouling-resistant membrane element manufactured with the latest materials and production technology. With an effective membrane area of 400 square feet and a 34-mil feed spacer, it is suitable for various applications including desalination of brackish water with TDS up to 10,ooo ppm, desalination of slightly polluted surface water, and reuse of cooling tower blowdown water.The TMY20D-40o is currently the brackish water membrane element with the highest water production and highest salt rejection; it features the widest cleaning pH range (pH 1-13), enabling quick and effective resolution of membrane fouling issues; the RO membrane can withstand minor hypochlorite exposure incidents within a certain range caused by operational errors, thereby enhancing system safety.

Membrane Element Performance Specifications

Important Operating Information

(1)  Each  membrane element is shipped with one brine seal, one interconnector (product water adapter) with appropriate O-rings, and one product water end cap (Not always necessary for 8-inch elements with internal product water connections). These are placed in the shipping box with the element. The actual contents shall prevail.

(2)    Elements are tested with water before shipment and preserved using a new oxygen absorber or a 1% sodium bisulfite solution. They are then vacuum packed in an oxygen barrier bag. To prevent microbial growth during short term storage, transportation, and system standby, elements must be immersed in a preservative solution made with purified water or RO permeate, containing 500-1000 ppm  of  sodium  bisulfite  (food  grade),  adjusted  to  pH  3-6.  Under  no  circumstances  should  the membranes be allowed to dry out. Refer to the relevant section of this technical manual for specific preservation procedures.

(3)  For  the  recommended  design  guidelines,  please  refer  to  the  latest  version  of  the  Toray technical  manual  and  system  design  software,  or contact  your  local  Toray  product distributor  or technical service center for assistance. The recommended design ranges are exceptions under severe fouling and scaling conditions. If the elements are operated outside the recommended conditions, the service life of the elements may be reduced. Toray will not be responsible for warranty claims if the operating conditions provided in this brochure are not strictly followed.

(4) The permeate water from the first hour of initial operation should be discarded.

(5) Back pressure on the product side of the membrane element must be avoided at all times.

(6) When the feed SDI is higher than 3 or 4, high productivity operation (each element operating at a high flux) will generally lead to frequent chemical cleaning. The permeate flow rate per element can be adjusted by regulating the system operating pressure. When the potential for fouling or scaling is low, the concentrate flow rate may be reduced appropriately. The minimum ratio of concentrate flow to permeate  flow  varies depending  on  the  feed  water  quality;  please  refer  to  the  relevant  design guidelines in this technical manual for specific values.

(7) When the pressure drop across a vessel increases to 1.5 times the initial value, chemical cleaning is  required.  Chemical  cleaning,  sterilization,  and  disinfection   procedures   must  follow  the  Toray technical manual.