With the development of society, the key technologies of pure water treatment machines are becoming increasingly sound. The reverse osmosis system, as an indispensable key component in pure water production, is widely used in various water purification equipment and engineering. Although reverse osmosis technology is much simpler and more advanced compared to traditional mixed bed pure water technology, there are still some key points that need special attention in the design of reverse osmosis systems. Below, the editor will talk about the core characteristics of reverse osmosis technology in pure water treatment equipment at home. Let's take a look together.

1. The pressure vessel of the reverse osmosis system should be installed independently on a specially designed frame, and there must be sufficient space at both ends of the pressure vessel to facilitate the installation and replacement of membrane components.

2. Because the pressure vessel will stretch to a certain extent during the operation of the reverse osmosis system, the normal deformation of the pressure vessel cannot be limited when fixing the pressure vessel and pipeline. At the same time, after the pressure vessel is compressed and stretched, the membrane components may move back and forth in the pressure vessel during system startup and shutdown or when there is a change in inlet and outlet water volume. Therefore, special gaskets can be used to fix the membrane components when installing them to avoid damaging them due to accumulation.

3. The high-pressure pump will generate hydraulic shock (water hammer) during startup and termination. If it directly acts on the membrane element, it will cause the adhesion line of the membrane bag to crack. Therefore, it is necessary to design corresponding devices for the reverse osmosis system to avoid or reduce the impact of water hammer on the membrane element. Large scale reverse osmosis equipment generally uses variable frequency pumps, soft starters, or electric slow opening valves (electric butterfly valves) to avoid hydraulic impact. It is recommended to use variable frequency pumps or soft starters.

What are the unique features of reverse osmosis key technologies in pure water treatment machines? 4. The pressure drop of a single membrane element cannot exceed 15PSI. Excessive pressure drop will cause the membrane element to extend along the direction of water flow, resulting in eye-catching conditions and damage to the membrane element. So during the operation period of the reverse osmosis system, it should be ensured that the pressure drop of a single membrane element does not exceed 15 PSI, and the pressure drop of a single pressure vessel does not exceed 60 PSI. Once exceeded, please clean the membrane elements in a timely manner.

5. Reverse osmosis membrane components cannot withstand back pressure under any circumstances, as back pressure (the pressure on the back of the membrane exceeds the pressure on the front) can cause the polyamide desalination layer on the surface of the membrane to peel off, resulting in irreparable damage to the membrane components.

6. During the design of the reverse osmosis system, low-pressure cleaning of membrane components can be carried out at each start-up and termination of the system. In addition, during the short-term shutdown period of the system (not exceeding 7 days), membrane components can be cleaned daily with reverse osmosis product water. Note that during any cleaning, the flushing water must meet the inlet water requirements of the reverse osmosis membrane element, and the cleaning flow rate must not exceed the inlet water flow rate of a single membrane element.

7. Temperature measurement is aimed at the reverse osmosis system of purified water equipment. The temperature of the inlet water can affect many parameters, such as conductivity, water production, inlet water pressure, etc. Therefore, it is recommended to install an online temperature detector on the reverse osmosis system as a daily operating parameter record item, which facilitates the standardization of operating parameters and makes correct judgments on system operation. For water sources with high inlet temperatures, a temperature alarm system must also be set up. When the inlet temperature exceeds 45 ℃, an alarm can be triggered and the operation of the reverse osmosis system can be terminated if necessary.

8. The measurement of conductivity requires temperature compensation when installing an online conductivity meter for the reverse osmosis system. The measured conductivity must be compensated to 25 ℃ to facilitate the calculation of the system's desalination rate. In addition, the conductivity meter must be calibrated according to the operating procedures of the equipment provider before it can be applied. The installation position of the water inlet conductivity meter should be after the last compound is added, which is in front of the high-pressure pump; The installation position of the water conductivity meter is before the post-processing. If conditions permit, multiple water conductivity meters can be installed to measure the conductivity of water at different locations, obtaining more detailed operating parameters of the system operation. Each pressure vessel should be equipped with an independent water sampling port, so that when the conductivity of the produced water in the system rises abnormally, it is easy to determine the location of the occurrence.

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