How to find out if the membrane is contaminated when using the ultrapure water machine?

       Ultrapure water machine is a kind of laboratory water purification equipment. It is a water treatment that removes all solid impurities, salt ions, bacterial viruses, etc. device.

Ultrapure water machines can usually produce two types of water: pure water and ultrapure water. Ultrapure water machines are widely used in medical, electronics, chemical, biophysical and chemical laboratories and other industries. As we all know, natural water usually contains many magazines, such as ions, organic matter, particles and microorganisms, etc. The function of the ultra-pure water machine is to remove these magazines and turn the water into pure water for experiments. It purifies water and removes impurities in the water. The more impurities are removed, the purer the water quality. Generally, the water purification process can be roughly divided into 4 major steps, pretreatment (low-level purification), reverse osmosis (production of pure water). water), ion exchange (can produce 18.2mΩ.cm ultrapure water) and terminal treatment (produce ultrapure water that meets special requirements).

In the process of using the ultrapure water machine, there will be different pollution of membrane elements, so how to see whether the membrane is polluted, let's talk about the common symptoms of its pollution in detail.

At standard pressure, water production drops

In order to achieve the standard water production, the operating pressure must be increased

Increased pressure drop between feed and concentrate

The weight of the membrane element increases

Significant change in membrane removal rate (increase or decrease)

When the element is taken out of the pressure vessel, pour water on the water inlet side of the upright membrane element, the water cannot flow through the membrane element, and only overflows from the end face (indicating that the water inlet channel is completely blocked).

In the above situation, it is recommended that the user contact the manufacturer to replace the membrane element.