Technology: Reverse osmosis membrane chemical cleaning on a number of techniques - reverse osmosis membrane, membrane cleaning - water industries

Technology: Reverse osmosis membrane chemical cleaning on a number of techniques - reverse osmosis membrane, membrane cleaning - water industries

Editor's Note: As China Sewage Increasingly stringent emission standards, Membrane Production of large-scale localization, more and more membrane technology used in municipal sewage and industrial effluent treatment of various fields, membrane cleaning materials will directly affect the membrane life and operating costs. China's water network users ma3g1771 according to a blog editor for film related content for Cleaning of finishing below for reference numbers of visitors.

Washing the membrane pieces are generally divided into two types of physical cleaning and chemical cleaning, chemical cleaning frequency higher, the greater damage to the membrane pieces, seriously affected the life of the membrane system. Therefore, it is difficult to master the relevant technology membrane chemical cleaning. Membrane cleaning frequency and degree of perfection of pretreatment measures are closely related. Pretreatment of the more perfect, clean longer intervals; the contrary, the more simple pretreatment, cleaning the higher the frequency. Membrane cleaning is usually followed (10% rule)?? When calibrated water flow and the first 200h run (after the occurrence of compression) of the flow ratio decreased by 10% and (or) observed an increase of 10% pressure 20% would need to be cleaned. Desalination rate has dropped as shown in the previous measures. Formal arrangements for the protection of reverse osmosis systems to maintain clean enough protection. For example, as pretreatment equipment not working properly, water conditions will change in a short time. Anti-washing in preventing certain forms of large particles Reverse Osmosis Module of the plug to be effective. But not all of the pollution can be a simple washing will remove the anti get rid of the chemical also need periodic cleaning. Chemical cleaning agents and in addition to increased labor costs, there is a pollution, so it must not be too frequent, a month should not exceed 1 or 2 times, each wash for about 1 ~ 2h. Chemical cleaning systems typically include a chemical mixing tank, and with matching Pump , Mixer, Heaters And so on. Chemical cleaning often is based on operating experience to determine (according to the pressure drop readings for each device and run out of time curve, or the basis for water production, water quality and membrane pressure drop, etc.). Chemical cleaning agents and methods used, need to decide according to sources. The following table for reference, but more attention should be paid and applied experience in the unit. To ensure the effectiveness of chemical cleaning should be washed before. Before washing blood pressure, and then 2 to 3 times the normal flow of water washing film role will be stirred by fluid from the membrane surface dirt strip and away from the membrane surface. Then for the pollution characteristics, choose washing liquid on the membrane chemical cleaning. In order to protect the reverse osmosis module, liquid temperature preferably not more than 35? C. Disable the system if more than 5 days, preferably after washing with formaldehyde into use. If the system is out for two weeks or so, needed 0.25% formaldehyde soaked to prevent microbial growth in the film. Replaced once a week is best chemicals. For various pollutants cleaning agent used in the table below, as the water quality of different parts for reference purposes only.

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