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Due to the water pollution according to seasonal changes, water quality is poor, and long-term operation of its RO reverse osmosis equipment, resulting in reverse osmosis membrane pollution in equipment components, frequent cleaning.
at the same time reverse osmosis membrane cleaning is a high technical requirements of the work, according to different water quality, pollutant characteristics of analysis, summarized some reverse osmosis membrane pollution causes.
common membrane pollution blocking situation has the following: 1, colloidal blocking is a common phenomenon, whether it is groundwater or surface water, total contains iron aluminum colloid, silicone colloid, organic colloid, pretreatment added to the coagulant, coagulant, scale inhibitor and other formation of colloids, these may be deposited on the membrane surface to form colloidal pollution.
2, biological pollution blocking mainly occurs in the water treatment system frequency and the system of extensive start-stop operation.
single fungicide is not to kill all kinds of bacterial microorganisms in the water, the system is located in the dead end area, or the time of discontinuation caused by the growth and reproduction of bacterial microorganisms, adhere to the membrane surface to form a biomustic membrane.
3, fouling often occurs in two sections, by concentrated salt water excessive dissolved salt precipitation and fouling. the
is shown as the increase of the primary pressure drop, the desalination rate decreases, and the force decreases.
can be controlled as long as the recovery rate and the amount of scale inhibitor swellcants are adjusted.
4, often particle pollution congestion mainly occurs in the front end of the equipment. the main reason for
is that the new system is not thoroughly flushed when delivered, and corrosion fragments such as fine sand pass through.
or run high pressure difference, so that the diaphragm on the edge of the membrane falls off and plugs into the front end of the next membrane.
these are mechanical stains and are preventable.
reverse osmosis film in the use of medical purification water equipment, will be contaminated by water debris, because of the water quality is different, the pre-treatment process methods adopted are also different, so the reverse osmosis of pollutants are different, the speed of pollution blocking is very different, speed up the rate of pollution and the complexity of pollution, increase the difficulty of cleaning.
.