In the design scheme of the reverse osmosis system, membranes with low transmission coefficients should be selected, and attention should be paid to the design scheme of their pre-treatment system, cleaning system and chemical water treatment system, post-treatment process system, and the purpose of pre-treatment is to increase the service life of the membrane; Avoid membrane environmental pollution; Ensure that the removal performance of the system is in line with its utilization rate. Its level depends on the type of membrane components, composition of the material and liquid, and the performance achieved by the specified system. Pre treatment is the process of removing or reducing various elements that pose a threat to the membrane, including the removal of suspended solids, adjusting pH and temperature, removing emulsions, floating oils, etc., to prevent the accumulation of microbial strains, colloidal solutions, as well as other particles, inorganic substances, and chemical substances such as positive ions on the membrane surface. Generally, it can be removed through methods such as coagulation precipitation, activated carbon filtration, and acid addition.

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