How to extend the service life of reverse osmosis equipment in the food industry-Ocpuritech-img

How to extend the service life of reverse osmosis equipment in the food industry?

by:Ocpuritech     2021-03-11
Food industry pure water equipment reverse osmosis method to extend the service life of the author of the article:? With the phenomenon of severe water pollution, food industries are using pure water equipment to improve water quality. The reverse osmosis membrane is the key to water use for pure water equipment in the food industry. If the life of the reverse osmosis membrane, it will directly affect the life of the equipment and directly affect the cost of the equipment. So, in the daily use of users, how to extend the service life of the reverse osmosis membrane of the food industry pure water equipment? Here we teach you some methods to extend the equipment. 1. The rationality of the design The rationality of the design is divided into the effect of pretreatment and the rationality of the reverse osmosis system design! Whether the pretreatment process is reasonable or not is directly related to the service life of the RO membrane, and unqualified pretreatment effluent The RO membrane may collapse in a week. The rationality of pretreatment refers to the influent water quality standard of RO membrane that should be reached for different types of water sources and the water produced by the pretreatment process. The design of the reverse osmosis system is directly related to the service life of the RO membrane. From an economic point of view, a too low membrane flux will reduce the equipment utilization of the membrane system, increase the equipment scale of the membrane system, and increase the investment cost of the system. From a technical point of view, an excessively high membrane flux will increase membrane fouling, accelerate membrane performance degradation, increase membrane cleaning and replacement, and shorten the service life of RO membranes, that is, increasing operating costs. The ideal membrane flux should minimize the total system cost of the combination of investment and operating costs, that is, the recommended average flux of the membrane system, the highest flux of membrane elements, and the highest concentration polarization of the system. Expected annual decay rate of membrane flux and annual increase rate of salt permeability under parameter conditions. 2. Prevent damage to membrane performance. New reverse osmosis membrane elements are usually soaked in 1% NaHSO3 and 18% glycerin aqueous solution and stored in a sealed plastic bag. If the plastic bag is not broken, it will not affect its life and performance even if it is stored for about 1 year. When the plastic bag is opened, it should be used as soon as possible to prevent the NaHSO3 from being oxidized in the air, which may cause adverse effects on the components. Therefore, the membrane should be opened before use as much as possible. After the equipment test, we used two methods to protect the film. After running the equipment for two days (15-24h), then use 2% formaldehyde solution for maintenance; or after running for 2-6h, use 1% NaHSO3 aqueous solution for maintenance (the air in the equipment pipeline should be exhausted to ensure The equipment does not leak, close all inlet and outlet valves). Both methods can get satisfactory results. The first method is more expensive and is used when the idle time is long, and the second method is used when the idle time is short.
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