RO reverse osmosis water purification equipment report: The key reason for the performance degradation of reverse osmosis membranes is due to environmental pollution on the membrane surface, such as surface fouling and membrane surface blockage; Or caused by the physical transformation of the membrane itself. The change in physical state is mainly due to the compaction effect causing a decrease in the permeability coefficient of the membrane; The chemical reaction is mainly caused by the fluctuation of pH value, which leads to the dispersion of chlorine in the hydrolysis reaction of cellulose acetate and the deterioration of the performance of aromatic polyamide membranes. The key reason for environmental pollution and blockage of reverse osmosis membranes is due to membrane surface accumulation and the growth of microbial species. Among them, microbial strains not only block the membrane, but also have a corrosive effect on cellulose acetate. Therefore, it is necessary to maintain a certain amount of residual chlorine inside the membrane. However, if the residual chlorine is too high, it will cause a decrease in membrane performance. Therefore, the residual chlorine should be maintained at 0.1-0.5mg/L before the acetate fiber membrane, while the residual chlorine before the aromatic polyamide membrane should be less than 0mg/L.

The cleaning solution of reverse osmosis membranes is a delicate and tedious task. At present, the quality of domestic membranes is not high enough, and the membranes are prone to damage after several cleaning cycles. In order to better alleviate the cleaning work, it is necessary to do a good job of pre cleaning and strictly control the water body, otherwise, the gains are not worth the losses.

The solution is to clean the circulation system with 0.1% formaldehyde solution and a concentration of 100mg/L of new Jie'er solution on time, which is less than 1 hour. Membranes that have already been environmentally polluted should be cleaned with a 2% ammonium citrate aqueous solution (pH=4-8), or with sodium hydroxide, sodium hexametaphosphate, dilute hydrochloric acid, etc. to avoid the accumulation of manganese, iron, and sulfides. Sometimes enzyme cleaners are also used to clean organic compounds. The cleaning pressure is controlled between 0.34~0.98 MPa (3.5~10 kgf/cm2), and the cleaning water flow rate is 2-3 times that of the original sewage treatment water flow rate.

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