How to replace RO membrane in Pure water reverse osmosis system

Part 1: Preparation

1. Prepare all the tools that may be used in the construction process

2. Clean up the upstream water inlet pipe

3. Carefully evaluate the quality of feed water

4. Check whether there is leakage in the pipe

5. Prepare water-soluble lubricant (chemically pure glycerin)

6. Ensure that all parts and chemicals used are complete

7. Check the operation of the pretreatment system well

Part 2: Disassembly and installation of membrane

1. Disassemble the pressure vessel of the reverse osmosis membrane, unify all end caps and parts, and store them in order

2. Take out the old membrane element from the pressure vessel, and rinse the pressure vessel clean

3. Take out the new membrane element and check whether the position and direction of the brine seal ring on the element are correct

4. Push the end of the membrane element without the salt water sealing ring into the membrane shell from the water inlet end of the pressure vessel in parallel until the element is exposed about 10 cm outside the water inlet end of the pressure vessel

5. Insert the connecting pipe between the components into the central pipe. Before installation, apply a small amount of glycerin lubricant on the "O" ring of the joint. If not, also can wet it with qualified pure water

6. Repeat the steps until all the components are loaded into the pressure vessel, transfer to the concentrated water end, install the connecting pipe on the center pipe of the first component, the length of the components and the pressure vessel determines the number of membrane elements that can be installed in a single pressure vessel , When installing, install a thrust ring on the concentrated water end of the pressure vessel

7. Check the "O" ring on the component adapter, insert the component adapter into the concentrated water end plate, align the component connecting pipe and push the concentrated water end plate assembly into the pressure vessel in parallel; rotate to adjust the concentrated water end plate assembly, Align it with the external connecting pipe; install the end plate snap ring

8. Push the membrane element from the water inlet side to the concentrated water side until the first installed membrane element is firmly in contact with the concentrated water end plate

9. Install the water inlet end plate. Before installing the water inlet end plate, in order to prevent the axial movement of the components and the impact between the components when the system is turned on and off, the gap between the membrane element and the end plate can be adjusted with an adjustment piece (thickness 5mm)

10. Repeat the above steps, install membrane elements in each pressure vessel and connect all external water inlet, concentrated water and production water pipelines

Part 3: Commissioning of Pure water reverse osmosis system

1. Inspection and preparation all parts before commissioning

2. Check all valves to ensure that all settings are correct, product water discharge valve, inlet water control valve and concentrated water control valve must be fully open

3. Use low-pressure pure water to remove the air in the membrane element and pressure vessel, all product water and concentrated water in the process should be discharged to the sewer

4. During the flushing operation, check if any leak point on valve or pipe connections

5. Confirm agenin that if product water valve and the concentrated water control valve are open

6. When start the high-pressure pump for the first time, the inlet control valve between the high-pressure pump and the membrane element must be fully closed to prevent the impact of water flow and pressure on the membrane element

7. While slowly opening the inlet water control valve at the outlet of the high-pressure pump, slowly close the concentrated water control valve to maintain the concentrated water discharge flow specified by the system design, while observing the system production water flow, and gradually adjusting the recovery rate to reach the design value

8. Check whether the dosage of all chemical agents is consistent with the design value, and determine the pH value of the feed water

9. The system runs continuously for 1 hour. When the product water is qualified, first open the qualified product water delivery valve and then close the product water discharge valve to supply water to the subsequent equipment. Record all operating parameters of the first group. The above adjustments are generally processed in manual operation mode, then can convert the system to auto operation mode when stable.

10. After 24 to 48 hours of continuous operation, check all recorded system performance data, including feed water pressure, pressure difference, temperature, flow rate, recovery rate and conductivity. At the same time, sampling and analysis of feed water, concentrated water and product water. Check the system operate promptly then complete the construction.

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