Description
TM720D-400 is a high-desalination, high-water-production, chemical-cleaning-resistant membrane element manufactured using the latest materials and production technology. It features an effective membrane area of 400 square feet and a feedwater spacer thickness of 34 mil. It is suitable for brackish water desalination with salinity below 10,000 ppm, as well as various applications such as desalination of mildly polluted surface water and reuse of cooling tower blowdown. TM720D-400 currently offers the highest water production and desalination rate among brackish water membrane elements. It has the widest cleaning pH range (pH 1–13), enabling fast and effective resolution of membrane fouling issues. The reverse osmosis membrane sheet can withstand minor chlorine residual leakage incidents within a certain range caused by operational errors, thereby enhancing system safety.
Important Operational Information
(1) Each membrane element is shipped with a brine seal, a coupling adaptor with corresponding O-rings, and a product water end cap (for 8-inch interlocking membrane elements, the end cap may not be required). These accessories are packed together with the membrane element in the shipping box. Actual contents are subject to the physical package.
(2) All membrane elements undergo a water flux test before shipment. They are then preserved with a new oxygen scavenger or a 1% sodium bisulfite solution, vacuum-sealed in an oxygen-barrier bag. To prevent microbial growth during short-term storage, transportation, or system standby, elements should be immersed in a preservative solution of 500–1,000 ppm sodium bisulfite (food grade) prepared with purified water or RO permeate, with pH adjusted to 3–6. Under no circumstances should the membrane be allowed to dry out. Refer to the relevant sections of this technical manual for detailed preservation methods.
(3) For recommended design guidelines, please refer to Toray’s latest technical manual and system design software, or contact a local Toray membrane distributor or technical service center. The recommended operating range may not apply under severe fouling or scaling conditions. Operating outside the recommended range may reduce membrane life. If the operating conditions provided in this manual are not strictly followed, Toray will not be liable under the warranty.
(4) Permeate from the first hour of initial operation should be discarded.
(5) Backpressure on the product side of the membrane must be avoided at all times.rse Osmosis Membrane
(6) When feedwater SDI exceeds 3 or 4, high permeate flow operation (i.e., high flux per element) will generally lead to frequent chemical cleaning. Permeate flow per element can be adjusted by regulating system operating pressure. If fouling or scaling potential is low, the concentrate flow rate may be appropriately reduced. The minimum concentrate-to-permeate flow ratio varies depending on feedwater quality. Refer to the relevant design guidelines in this technical manual for specific values.
(7) Chemical cleaning is required when the pressure drop across the vessel increases to 1.5 times the initial value. Chemical cleaning, disinfection, and sanitization procedures must follow the Toray technical manual.
(8) Users should avoid using any chemicals that may damage the membrane elements. Toray will not be liable under the warranty if such chemicals are applied.
Note:
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Since Toray cannot control user application methods and conditions, Toray does not guarantee the suitability, safety, or consequences of using the information and data provided in this manual, whether the products are used alone or in combination with others. Users are advised to conduct tests to determine the safety and suitability for their specific applications.
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Technical information is subject to change without prior notice due to product improvements and updates.
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