JRO reverse osmosis water treatment equipment made of fiberglass

Description :

　　The pretreatment system of reverse osmosis water treatment equipment usually consists of polypropylene fiber (PP) filters and activated carbon (AC) filters. For raw water with high hardness, a softening resin filter needs to be installed. PP filter element can efficiently remove mechanical particle impurities, rust, and large gel like substances above 5 μ m in raw water, protecting subsequent filters. Its characteristics are large pollutant capacity and low price. AC activated carbon filter can efficiently adsorb residual chlorine and some organic matter and colloids in raw water, protecting polyamide reverse osmosis composite membranes from residual chlorine oxidation. Softening resin can remove most of the calcium and magnesium ions in raw water, prevent subsequent scaling and blockage of the RO membrane surface, and improve water recovery rate.

　　There are two ways to clean reverse osmosis equipment: online cleaning and offline cleaning.

　　1、 Online cleaning

　　Online cleaning refers to the overall cleaning of the reverse osmosis device, without taking out the pressure vessel for the membrane components, and is usually designed and used in larger systems. This cleaning method is simple and convenient to operate, with a short time, but it is prone to incomplete cleaning and unsatisfactory results. This method can be used when the pollution of the reverse osmosis device is relatively light.

　　2、 Offline cleaning

　　Offline cleaning refers to the process of removing membrane components from a reverse osmosis pressure vessel and placing them into a cleaning equipment for cleaning. Typically, the number of components cleaned at a time should not exceed 6. This cleaning method is simple and convenient to operate, thoroughly cleaned, and has good results. But when there are many membrane components, the cleaning time is longer. This method can be used when the reverse osmosis pollution is severe or the online cleaning effect is poor.

　　The main reason for the performance degradation of reverse osmosis membranes is due to surface contamination, such as surface scaling and membrane blockage; Or it may be caused by physical and chemical changes in the membrane itself. The physical changes are mainly caused by the compaction effect, which leads to a decrease in the permeability of the membrane; Chemical changes are mainly caused by fluctuations in pH value, such as hydrolysis of cellulose acetate membrane; Free chlorine can also deteriorate the performance of aromatic polyamide membranes. The main reason for fouling and blockage of reverse osmosis membranes is due to membrane surface deposition and microbial growth. Microorganisms not only block the membrane, but also have an erosive and damaging effect on cellulose acetate. Therefore, a certain amount of residual chlorine must be maintained inside the membrane, but if the residual chlorine is too high, it can cause a decrease in membrane performance. Therefore, residual chlorine should be maintained at 0.1-0.5mg/L before the cellulose acetate membrane, and less than 0.1mg/L before the aromatic polyamide membrane.

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