Performance features

DowFILMTEC™BW30-440iIt features high water production, has the highest effective membrane area in the world's membrane industry, and adopts a high desalination rateBW30Series reverse osmosis membrane sheets. Dow membraneBW30-440iDesigned to reduce the investment cost of preparing industrial high-purity water without increasing membrane flux.

In contrast to DowFILMTECTMBW30-400Under the same operating pressure and high desalination rate conditions, the components are increased10%The effective membrane area has increased the water production10%It can reduce the initial investment cost of the new system and also increase the water production capacity of the existing system.

AdoptediLECTM The end face self-locking connection technology not only reduces the operating cost of the system but also lowers the riskO The risk of a decline in the quality of the produced water due to leakage of the sealing ring.

Dow membrane features a compatible design and adopts the current inner diameter of1.125 The industrial standard production water pipe in inches can thus be connected in conjunction with the existing brackish water film elements that are inserted and connected.

Product Specification

The above test values of Dow membrane are based on the following test conditions:2,000 ppm NaCl, 225 psi (15.5 bar), 77°F(25°C), pH 8, 15% Recovery rate.

2. The water production capacity of a single element of Dow membrane may vary, but it will not be lower than the listed value15%.

3. When the quality of Dow membrane products improves, the product specifications may change slightly.

4. The guaranteed range of the effective membrane area of Dow membranes is+/-3%This effective membrane area is different from the nominal membrane area often adopted by some membrane suppliers.

Stable desalination rate

Dow sets a low desalination rate in its technical specifications mainly for the purpose of quality assurance(QA)The purpose is to ensure the integrity of each membrane element produced. A stable desalination rate is a supplement to a small desalination rate, providing a useful basic data for engineering design and predicting system performance. The stable desalination rate was measured in the laboratory through durability tests using brine. The test conditions are the same as those for determining the minimum desalination rate. However, the test needs to continue until the performance of the membrane element stabilizes, in order to simulate the long-term desalination performance of the membrane element. When DowFILMTECAfter the component is initially started up and reaches stability, its desalination rate performance will exceed oursQAThe conservative performance data presented in the test. This high desalination level remains highly stable and consistent over time. Although the stable desalination rate cannot take into account many system variables that the components will encounter on site, it still provides a useful basis for reverse osmosis engineering design.

When choosing membrane elements, if you want to learn more about the stable desalination rate, you can obtain the reference document "Understanding the Desalination Rate of Reverse Osmosis Membrane Elements" from your local Dow officeROSAComputer design program. Developed by Dow Chemical's Liquid Separation DivisionROSAThe program, using specific information about the project, simulates system operations and sketches an accurate blueprint for the application of components under real-time conditions.ROSAThe provided data can help you select components based on specific conditions rather than onQASpecification values generated from tests or laboratory tests.

Important Information

When the membrane system is ready to be put into operation, it is very important to start the reverse osmosis system correctly to prevent the membrane elements from being damaged due to excessive feed water flow or hydraulic shock. Following the correct startup procedure can ensure that the operating parameters of the system comply with the design specifications, thereby making the effluent quality and conductivity of the system meet the requirements. inROBefore the system starts up, the pre-treatment debugging of the system, component filling, instrument calibration and other system detection work should be completed.

Operation Guide

To prevent damage to the membrane elements, 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 in accordance with the following method:

The water inflow to the membrane element should gradually increase the pressure, and the time for the pressure to rise to the normal operating state should be no less than30-60Seconds.

The feed water flow rate of the membrane element should also be gradually increased, and the time for the flow rate to reach the specified value should be no less than15-20Seconds.

After the system starts up1The product water within an hour should be drained and discarded.

General Information

Once a component gets wet, it should always remain moist.

If Dow membrane does not strictly adhere to the design guidelines and operating limit values in the technical announcement, the limited quality guarantee will become invalid.

During the system shutdown, transportation and storage of Dow membranes, to prevent the growth of microorganisms, we recommend immersing the membrane elements in the preservation solution. The standard preservation solution contains1.5%(Weight)Sodium bisulfite(level).

Dow membrane elements are rarely used6Formaldehyde can only be used after several hours. If there6The use of formaldehyde within hours may lead to flux loss.

Dow membrane. This membrane is resistant to chlorine(Hypochlorite)Short-term attacks have a certain resistance, but continuous contact will damage the membrane, so it should be avoided.

Dow membrane customers shall be responsible for the impact of incompatible chemicals and lubricants on the components. The use of incompatible ones will render the limited quality guarantee invalid.

The maximum allowable pressure drop of a single Dow membrane pressure vessel is50psi(3.4bar)

Dow membrane precautions: Always avoid back pressure on the water side of the product.