Dow 8-inch nanofiltration membraneWaste leachate treatment membrane, material separation membrane Dow NF270-400

Introduction to Dow NF270-400 Nanofiltration Membrane Components:

FILMTEC? The NF270-400 nanofiltration element has a large surface area and high water production. It is specifically designed for highly removing TOC (organic carbon) and THM precursors, while allowing moderate hardness components to pass through and moderate or large amounts of other salts to pass through. NF270-400 is an ideal membrane element for removing organic matter and partially softening surface and groundwater to maintain specific water hardness and taste. The large membrane area of the modified component, combined with the low net driving pressure, enables NF270-400 to remove organic compounds at low operating pressures.

Dow Nanofiltration Membrane is applied in material separation fields such as garbage leachate treatment, electroplating wastewater filtration, electrophoretic paint recycling filtration, etc.

Dow Nanofiltration Membrane Product Specification:

• 1. The water production and desalination rate are based on testing conditions:
• 500ppm CaCl2, 70psi(4.8Bar), 25oC, 15% recovery rate.
• 2000ppm MgSO4, 70psi(4.8Bar), 25oC, 15% recovery rate.
• 2. The water production of a single component varies within a range of+15%.
• 3. The above specification values were measured through a test bench. When operating, please be sure to follow Dow's system design guidelines.
• 
  

• product name	Single component Recovery rate%	Dimensions - inches (millimeters)
  		A	B	C
  NF270－400	15	40.0 (1016)	1.125 (29)	7.9 (201)

  1. Recovery rate refers to the percentage ratio of the product water flow rate divided by the feedwater flow rate. 1 inch=25.4 millimeters

  When designing a multi-component system, please refer to FilmTec's design guidelines and follow the corresponding recovery rate limits based on the type of water supply.

  3. The component is equipped with a pressure vessel with a nominal inner diameter of 8 inches (203mm).

  

  Dow Nanofiltration Membrane NF270-400 Operating Limit Values:

  • Type of membrane: Polyamide composite membrane
  • Maximum operating pressure: 600psi (41Bar)
  • Maximum operating temperature: 45oC
  • Maximum pressure drop: 15psi (1.0Bar)
  • Continuous operation pH range: 3-10
  • Short term cleaning pH range (30 minutes) b........................ 1-12
  • Maximum feedwater flow rate: 70gpm (16m3/h)
  • Maximum Water Supply SDI....................................................... SDI 5
  • Free chlorine tolerance c is less than 0.1ppm

  When pH>10, the maximum temperature for continuous operation is 35oC.

  B  Reference Cleaning Guidelines (Document Number: 609-23010/CH 172-086-E)

  Under certain conditions, the presence of free chlorine and other oxidants may cause membrane damage. Therefore, oxidation damage is not within the scope of quality assurance. FilmTec suggests that free chlorine should be removed through pretreatment before entering the membrane system. Please refer to the technical bulletin (609-22010/CH 172-144-E) for more information

  When preparing to put the membrane element into operation, in order to prevent membrane damage caused by excessive water flow or hydraulic shock, it is necessary to start it correctlyreverse osmosisThe system is very important. Following the correct startup procedure can ensure that the operating parameters of the system comply with the design specifications, thereby achieving the required effluent quality and conductivity. Before starting the RO system, pre-processing, component filling, instrument calibration, and other system testing should be completed. Please refer to the application technology literature "How to Start RO Membrane System" (609-00070/CH 172-085-E) for more information.

  

  operation guide

  In order to avoid damage to roll type membrane components, sudden changes in pressure or flow rate should be avoided during startup, shutdown, cleaning, or other processes. During the startup process, we recommend gradually transitioning from the stopped state to the running state using the following method:

  • The water supply should gradually increase in pressure, and the time for the pressure to reach normal operating state should not be less than 30-60 seconds.
  • The flow rate of water supply and product water should also gradually increase, and the time for the flow rate to reach the set value should not be less than 15-20 seconds.
  • The product water should be drained within the first hour after system startup.

  General Information

  • Once the component is soaked, it should always be kept moist.
  • If the design guidelines and operating limits in the technical bulletin are not strictly followed, the limited quality assurance will be invalidated.
  • During system shutdown, to prevent microbial growth, we recommend immersing the membrane components in a preservation solution.
  • The impact of using incompatible chemicals and lubricants on components should be fully borne by the customer.
  • The pressure drop across each pressure vessel must not exceed 50 psi (3.4 Bar).
  • Always avoid back pressure on the water side of the product.

  Note: No one shall assume that they have the freedom to use patents owned by the seller or others under this document. Due to variations in usage conditions and applicable laws over time and place, customers are responsible for determining whether the products and product information in this document are suitable for their use, and ensuring that their workplace and handling of products comply with applicable laws and other government regulations. The seller assumes no responsibility or obligation for the information in this document, and does not provide any guarantees. All implied warranties regarding the marketability or suitability for a particular purpose of the product under this document are expressly excluded.