Experimental Study On RO Membrane Fouling Process And Membrane Cleaning

The development of science and technology promotes high water quality in some industries, while the reverse osmosis membrane as a new technology to produce pure water attracts more and more attention with its highly efficient, stable and high degree of automation. In areas such as electronics, pharmaceuticals, thermal power, reverse osmosis technology is gradually replacing traditional technologies and becoming the mainstream. However, there are still some problems in the use the reverse osmosis membrane, first of all, membrane performance is significantly affected by the external environment factors, and then the membrane is vulnerable to be fouled, so mastering these issues has a very important role in the guidance of the scene .Given the problems discussed above into consideration, the study carried on. First under laboratory conditions, the experiment explore the factors affecting the performance of reverse osmosis, these factors include: operating pressure, temperature, recovery rate, pH, and water salinity. At the same time, the experiment examined the trend of reverse osmosis membrane performance while each of these factors changed. Test results showed that: pressure, temperature were major factors affecting reverse osmosis membrane performance. Recovery rate, pH, and water salinity were secondary factors that affecting the performance of reverse osmosis membrane. Reverse osmosis membrane is vulnerable to environment, so any factor changed would affect the performance of membrane.At the same time, in laboratory conditions, to simulate the inorganic pollution and organic pollution, the experiment added pollutants to original water. After that, the experiment tested the performance trend of in the process of pollution. The experimental results showed that both the two kinds of pollution could lead to a decline in flux. When the pollution of inorganic calcium carbonate developed to a certain degree, the rate of desalination would reduce. However, colloidal organic pollution could increase the rate of desalination. Cleaning experiments and SEM pictures showed: more than 80% were irreversible pollution in the two kinds of membrane fouling.At present, the import reverse osmosis occupies a monopoly position in the market. The experiment selected the same type of domestic and imported membranes, conducted in the same operating environment, and then compared the performance of both, especially the capability of anti-pollution, The results showed that: the two kinds of membranes had similar performance, No. B membrane had a greater water flux, while No. A membrane had a better performance in desalination.