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The grid cutting machine manufacturer will now introduce the issue of RO reverse osmosis membrane lifespan
Grid cutting machine manufacturer: How long is the lifespan of RO reverse osmosis membrane?
RO reverse osmosis membrane manufacturers generally provide a three-year quality guarantee for the quality and performance of RO reverse osmosis membranes to ensure that they can meet various indicators such as water production, desalination rate, and operating pressure during their normal service life of three years. According to the membrane manufacturer's guarantee terms, for composite membranes, the water production after three years under the same pressure is generally not less than 80%, and the salt permeability does not exceed 1.5 times. The service life of RO membranes mainly depends on two indicators: whether the reverse osmosis system can meet the requirements of water production.
Why is the service life of RO reverse osmosis membranes getting shorter and shorter? Improper operation of reverse osmosis equipment can cause damage to membrane performance, and the following reasons shorten the service life of RO reverse osmosis membranes:
1、 The residual gas in reverse osmosis equipment operates under high pressure, and the air hammer can damage the membrane. Two situations often occur:
After the equipment is emptied, when it is restarted, the pressure will rapidly increase, but no gas will be discharged. After discharging the remaining air at a pressure of 2~4 bar, the pressure will gradually increase.
When the connection between the pre-treatment equipment and the high-pressure pump is poorly sealed or leaks water (especially when the microfilter and the pipeline behind it leak water), or when the pre-treatment water supply is insufficient, such as when the microfilter is blocked, the poorly sealed area will suck in some air due to vacuum. The microfilter should be cleaned or replaced to ensure that the pipeline will not leak. In short, the flowmeter should be operated step by step without bubbles in the flowmeter. Bubbles found during operation should be gradually reduced in pressure, and the cause should be checked. The manufacturer of the grid cutting machine
2、 The incorrect shutdown method of the reverse osmosis equipment resulted in a shorter service life of the RO reverse osmosis membrane.
1. Quickly reduce pressure during the shutdown process, without the need for thorough flushing. Due to the higher concentration of inorganic salts on the concentrated water side of the membrane compared to the raw water, it is easy to scale and contaminate the membrane.
2. Rinse with water pre treated with chemical reagents. When the equipment is shut down, water containing chemical reagents may cause membrane fouling.
When the reverse osmosis equipment is ready to shut down, the addition of chemical reagents should be stopped, and the pressure should be gradually reduced to around 3 bar. Rinse with pre treated water for 10 minutes until the TDS of the concentrated water is very close to that of the raw water. Grid cutting machine manufacturer
3、 Poor disinfection and maintenance of reverse osmosis equipment can lead to microbial contamination, shortening the service life of RO reverse osmosis membranes. Grid cutting machine manufacturer
This is a common problem in the use of composite polyamide films. Due to the poor resistance of polyamide films to residual chlorine, incorrect addition of chlorine and other disinfectants during use, and insufficient attention to microbial prevention by users, it is easy to cause microbial contamination. Currently, many manufacturers produce purified water with excessive microorganisms, which is caused by poor disinfection and maintenance.
The main manifestations are: RO equipment is not maintained with disinfectant when it leaves the factory, the entire pipeline and pre-treatment equipment are not disinfected after installation, disinfection and maintenance measures are not taken during intermittent operation, pre-treatment equipment and reverse osmosis equipment are not disinfected regularly, and maintenance solution is ineffective or insufficient in concentration.
4、 Poor monitoring of residual chlorine in reverse osmosis equipment has shortened the service life of RO reverse osmosis membranes.
That's all for the introduction of grid cutting machine manufacturers today. Thank you for watching. If you need grid cutting machines or RO reverse osmosis membranes, you can contact our company.