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What is the core basis of reverse osmosis membrane system design?
In the process of reverse osmosis membrane design, three basic design bases are produced water flow, produced water quality and influent water quality. The influent water quality under the design condition of membrane system is the produced water quality of pretreatment system. Not only the various components of water should meet the requirements of membrane system, but also the insoluble salt saturation of feed water of membrane system may be increased due to the addition of scale inhibitor and dispersant. The specific contents of three types of membrane system design basis are as follows.
1. Water production flow: the water production flow requirements of the system are represented by cubic meters per hour, and the water production flow requirements of individual systems vary with seasons.
2. Water quality: including total salt content, fluorine, boron and other special ion content, pH value and other indicators. The general pure water preparation system mainly investigates the total salt content (mg / L) index, and the pH value or special ion content requirements can be treated in combination with the pre and post process of the membrane system. Generally, there is no seasonal difference in the quality of produced water.
3. Influent water quality: it can be further divided into five categories: water temperature, total salt content, insoluble salt content, non salt pollutants and water source type. The influent water quality of natural water body will change with seasons, while the influent water quality of process drainage may have higher variation frequency and range.
The inorganic components of the influent mainly include the total salt content and each insoluble salt saturation. Inorganic salt is the removal object of membrane system, and the threat of saturated precipitation of insoluble salt in feed / concentrated water channel constitutes the limiting condition of system recovery. The scaling tendency of sulfate, silicate and other insoluble salts in membrane system is characterized by their saturation index, and the scaling tendency of sulfate is characterized by Langmuir index.
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