When using dual stage reverse osmosis equipment, attention should be paid to the pre-treatment of raw water. To prevent blockage of reverse osmosis water treatment equipment, pre-treatment of raw water should be carried out to remove suspended solids in the water and reduce sedimentation turbidity; In addition, the raw water should be disinfected to prevent microbial growth. Due to the high requirements of reverse osmosis technology for suspended solids in raw water, water quality pollution index is usually used to detect the pollution status of suspended solids in water quality. Essentially, this method is used to determine the state of the reverse osmosis system being blocked by suspended solids in water. The pollution index of water entering the RO system should not exceed 5, and the recommended value is generally less than 3. The pH value of the influent should also be considered during pre-treatment. Various semi permeable membranes have their pH values that are suitable for operation, so it is necessary to adjust the inlet pH value according to the requirements of reverse osmosis membranes. During pre-treatment, the inlet water temperature should also be considered. As the water temperature increases, the permeability of the membrane increases, but too high a temperature will accelerate the hydrolysis rate of cellulose acetate membrane, making the organic membrane soft and easy to compact. Therefore, for organic membranes, the temperature should be controlled around 20-40 ℃; For composite membranes, the temperature should be controlled around 5-45 ℃. The separation technology of dual stage reverse osmosis equipment membranes is based on the principle of reverse osmosis membranes

Under the condition of no phase transition at room temperature, the separation of solute and water can be achieved, which is suitable for the separation and concentration of thermosensitive substances. Compared with the phase change separation method, it has lower energy consumption.

2. Reverse osmosis membranes have a wide range of separation and impurity removal functions.

3. High desalination rate and water reuse rate can intercept solutes with particle sizes larger than a few nanometers.

4. The membrane separation power adopts low pressure, the separation equipment is simple, the operation, protection, and self-control are simple, and it is hygienic.

When using reverse osmosis water treatment equipment, if the water production of the equipment decreases by 10%, and if the salt penetration doubles or the pressure drop doubles, it indicates that reverse osmosis needs to be cleaned. However, it should be noted that a decrease in temperature can also lead to a decrease in water production, which is a normal phenomenon. In addition to regular cleaning, try to run at low pressure for a few minutes during each startup to discharge the concentrated water from the reverse osmosis device to prevent it from entering the next stage of the device. Although the water quality management water treatment system is an automatic control operation, the automatic control operation is relatively simple. However, in terms of protection and management of the operation of two-stage reverse osmosis equipment, water quality management is of utmost importance. As a water station operator, it is beneficial to keep daily records of water quality management, promptly identify defects, and take measures.

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