Part One: Preparation Work
1.1 Prepare all tools that may be used during the construction process
1.2 Clean the upstream inlet pipeline;
1.3 Carefully evaluate the quality of incoming water;
1.4 Check for leaks in the pipeline;
1.5 Prepare water-soluble lubricant (chemically pure glycerol);
1.6 Ensure that all components and chemical agents used are complete;
1.7 Check the operation of the pre-treatment system and ensure that the effluent is normal.
Part 2: Disassembly of old reverse osmosis membranes and installation of new membranes
2.1 Disassemble the pressure vessel of the reverse osmosis membrane, unify all end caps and components, and store them in order. 2.2 Remove the old reverse osmosis membrane components from the pressure vessel and rinse it clean.
2.3 Remove the new membrane element and check whether the position and direction of the saltwater seal ring on the element are correct (the opening direction of the saltwater seal ring must face the water inlet direction).
2.4 Push the end of the membrane element without a saltwater seal into the membrane shell parallel to the inlet end of the pressure vessel until the element is exposed about 10 centimeters outside the inlet end of the pressure vessel.
2.5 Insert the connecting pipes between the components into the center pipe. Before installation, apply a small amount of glycerin lubricant on the "O" ring of the joint. If it is not available, it can also be directly wetted with qualified pre treated water.
2.6 Remove the second membrane element and check if the position and direction of the saltwater seal ring on the element are correct. Hold the element and insert the connecting tube on the first element into the center tube of the element. Push the element parallel into the pressure vessel until the second element is approximately 10 centimeters exposed.
2.7 . Repeat the steps until all components are loaded into the pressure vessel, transfer to the concentrated water end, and install the connecting pipe on the center pipe of the first component. The length of the component and the pressure vessel determines the number of membrane components that can be installed in a single pressure vessel. Install a thrust ring at the concentrated water end of the pressure vessel during installation.
2.8. Check the "O" ring on the component adapter, insert the component adapter into the concentrated water end plate, align with the component connecting pipe, and push the concentrated water end plate assembly parallel into the pressure vessel; Rotate and adjust the concentrated water end plate assembly to align with the external connecting pipe; Install the terminal card ring
Push the membrane element towards the concentrated water side from the inlet side until the first installed membrane element firmly contacts the concentrated water end plate.
2.10 . Install the inlet end plate. Before installing the inlet end plate, in order to prevent axial movement of components and impact between components during system startup and shutdown, an adjusting plate (thickness 5mm) can be used to adjust the gap between the membrane components and the end plate.
2.11 Repeat the above steps to install membrane components in each pressure vessel and connect all external inlet, concentrate, and production pipelines.
Part Three: Equipment Debugging
3.1 Pre commissioning inspection and preparation, which includes the following parts:
1. Configure measuring instruments and calibrate each instrument;
2. Set sampling points for each link of the system, and correctly set interlocking, delay, and alarm devices;
3. Check the connection between pressure vessels and cleaning pipelines, and tighten all joints;
4. Empty load test run of various rotating equipment such as water pumps to ensure correct steering and good lubrication;
5. Open the water discharge valve and the concentrated water discharge valve;
6. Before starting the high-pressure pump, adjust the opening of the outlet valve of the high-pressure pump to control that the water inflow of the membrane system is less than 50% of the water inflow during operation.
3.2 Check all valves and ensure that all settings are correct. The membrane system's water discharge valve, inlet control valve, and concentrate control valve must be fully opened
3.3 Use low-pressure, low flow qualified pre-treatment effluent to drive away the air inside the membrane element and pressure vessel. All produced and concentrated water during the process should be discharged into the sewer.
3.4 . During the flushing operation, check for any leakage points at all valve and pipeline connections.
The 3.5 dry film system should be continuously rinsed with low pressure for 6 hours
Rinse for 1-2 hours first, soak overnight, and then rinse for about 1 hour. During low-pressure and low flow flushing, it is not allowed to add scale inhibitors in the pretreatment section.
3.6 . Confirm again that the water production valve and concentrated water control valve are in the open position.
3.7 The first start-up of the high-pressure pump must ensure that the inlet control valve between the high-pressure pump and the membrane element is in a nearly fully closed state to prevent the impact of water flow and pressure on the membrane element.
3.8 Start the high-pressure pump.
3.9 To avoid excessive flow and pressure impact on the membrane system, the inlet control valve of the high-pressure pump should be slowly opened after starting, and the concentrated water flow rate should be uniformly increased to the design value at a rate lower than 0.07 MPa per second.
3.10 . Slowly open the inlet control valve of the high-pressure pump outlet while slowly closing the concentrated water control valve to maintain the specified concentrated water discharge flow rate in the system design. At the same time, observe the system's water production flow rate and gradually adjust it to achieve the design value of the recovery rate.
3.11 Check whether the dosage of all chemical agents is consistent with the design value, and measure the pH value of the incoming water.
3.12 . The system runs continuously for 1 hour. After the water production is qualified, first open the qualified water delivery valve and then close the water discharge valve to supply water to the subsequent equipment. Record all operational parameters of the first group. The above adjustments are generally carried out in manual operation mode, and after stabilization, the system is switched to automatic operation mode.
3.13 After continuous operation for 24-48 hours, review all recorded system performance data, including inlet pressure, pressure difference, temperature, flow rate, recovery rate, and conductivity. Simultaneously sample and analyze the incoming water, concentrated water, and total system produced water. Confirm that the equipment is operating normally and the construction is completed.
