ROReverse osmosis equipment is generally a pure water equipment system. During the usage process, due to a series of issues such as the design, maintenance, operation and management of the equipment, problems often occurROWhat exactly causes the phenomenon of membrane blockageROWhat about the clogging of the membrane? How should we deal with different clogging substances? Now, Yuanlai Water Treatment will answer your questions one by one.

　　Calcium carbonate scale

　　Calcium carbonate scale is a kind of mineral scale. As a scale inhibitor/When the dispersant addition system malfunctions or acid is addedpHThe water supply was caused by a malfunction in the regulating systempHWhen the height increases, calcium carbonate scale may deposit. Early detection of calcium carbonate scale is extremely necessary to prevent the crystals deposited on the membrane surface from damaging the membrane elements. Early detected calcium carbonate scale can be reduced by lowering the feed waterpHvalue3~5"Run1~2The method of removal in hours. For calcium carbonate scale with a long deposition time, low can be usedpHThe citric acid solution of the value is cleaned and removed.

　　Calcium sulfate, barium sulfate, strontium sulfate scale

　　Sulfate scale is a mineral scale much harder than calcium carbonate scale and is not easy to remove. Sulfate scale can be found in scale inhibitors/The dispersant addition system malfunctions or sulfuric acid is added for adjustmentpHIt was deposited over time. Early detection of sulfate scale is extremely necessary to prevent the crystals deposited on the membrane surface from damaging the membrane elements. Barium sulfate and strontium sulfate scale are rather difficult to remove because they are almost insoluble in all cleaning solutions. Therefore, special attention should be paid to prevent the formation of such scale.

　　Metal oxide/Hydroxide pollution

　　Typical metal oxide and metal hydroxide pollution includes iron, zinc, manganese, copper, aluminum, etc. The formation of this kind of scale may be caused by the pipelines and containers of the device(tank/slot)The corrosion products may be oxidized metal ions, chlorine, ozone, potassium, permanganate in the air, or caused by the use of iron or aluminum coagulant AIDS in the pretreatment filtration system.

　　Polymerized silica scale

　　Silicone gel scale is caused by the supersaturated state of dissolved silicon and polymers, and is extremely difficult to remove. It should be noted that the contamination of silicon is different from that of silica gel. Silica gel contamination may be caused by association with metal hydroxides or organic substances. The removal of silicon scale is very difficult and traditional chemical cleaning methods can be adopted. If traditional methods fail to solve the problem of removing this scale, please contact the technical department of Hydranautics. Existing chemical cleaning agents, such as ammonium hydrogen fluoride, have been successfully used in some projects. However, when using them, the operational hazards and damage to equipment of this method must be considered, and protective measures should be taken.

　　Colloidal contamination

　　Colloids are particles of inorganic substances or a mixture of organic and inorganic substances suspended in water, and they do not settle due to their own gravity. Colloidal substances usually contain one or more of the following main components, such as iron, aluminum, silicon, sulfur or organic matter.

　　Pollution from insoluble natural organic matter(NOM):

　　Pollution from insoluble natural organic matter(NOM-Natural Organic Matter)It is usually caused by the decomposition of nutrients in surface water or deep well water. The chemical mechanism of organic pollution is very complex. The main organic components are either humic acid or fulvic acid. InsolubleNOMAdsorption onto the membrane surface can causeROThe rapid contamination of membrane elements, once the absorption effect occurs, will gradually lead to the formation of gels or lumps in the contamination process.

　　Microbial deposition

　　Organic deposits are formed by slime, mold and other pollutants, which are difficult to remove, especially when the water supply channels are blocked. Blockage of the feed water passage will make it difficult for clean feed water to enter the membrane element fully and evenly. To inhibit the further growth of this sediment, it is important not only to clean and maintain itROThe system also needs to be cleaned, including the pretreatment, pipelines and ends, etc.