RO reverse osmosis system failure analysis to identify system failures

For many reasons can not cause the normal operation of reverse osmosis equipment. The same diagnosis as the doctor, in your further analysis of the problem, you must collect a variety of possible symptoms.



     2. Introduction



     This theme is how to exclude the RO equipment failure, we assumed that the equipment design, instrumentation and the corresponding sampling points and troubleshooting in order to meet the needs of cleaning equipment, industrial systems in this design is very common. However, for home or light industrial equipment, it is necessary. If small-scale RO equipment including related equipment and sampling valve, and its market price will be very expensive at this time often required for the replacement of RO membrane elements will have a much lower cost. To achieve a certain scale RO system (15 gallons / min or more, that is 35m3 / hour), when compared with the initial investment cost to add the relevant instruments, sampling valves and cleaning equipment, the regular replacement of RO membrane components become more expensive.



     3. How to avoid abnormal equipment is the best way to guard against the start, the following are some of the RO design recommendations:



     RO system design should have the water quality of the entire analysis. If the existence of seasonal changes in water quality (very common in surface water) or water changes (in the municipal water supply is very common), as far as possible you can get access to all analytical data and confirmed that they derived from the latest materials.



     The scene 15 minutes SDI (pollution density index) test to determine the occurrence of gel blocking the possibility of pollution.



     If you want to in the evening, on the first confirmed in the design of RO system has been designed to have sufficient pre-treatment.



     When in the design of RO (in particular the possibility of contamination) should leave some leeway in the design in order to clean the water as the water supply of reverse osmosis water system, can be used more than the surface water system, the radical design.



     In the conservative design of the RO system, opt for a lower water flux, because the reduction of unit membrane area will reduce the production of water pollutants in the membrane for the water to well water as a water supply system, design of water flux should be controlled at 8 ~ 14gfd (plus / sq. ft. / day) range. Well as water sources for water supply systems, the design of water flux should be controlled at 14 ~ 18gfd range.



     Recovery should take a more conservative value, so that the concentration of pollutants to a minimum.



     A conservative design should try to increase the water flow rate and concentration of water horizontal velocity, horizontal velocity the higher the salt surface and the main pollutants in the solution to the proliferation of faster, which can reduce the surface concentration of salt and pollutants.



     Use for different occasions, select the appropriate type of membrane components. In some cases, difficult in dealing with surface water and industrial waste water, the use of neutral CAB (cellulose acetate) film is superior to the use of elements with negative charge of the CPA (Composite Polyamide) membrane components.



     Investigate whether there is around you use the same water reverse osmosis water system.

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