Thread Content
1. Damage to the membrane properties of the reverse osmosis membrane, resulting in membrane fouling. (1) Polyester-based reinforced non-woven fabric, approximately 120 μm thick; (2) Polysulfone-based porous intermediate support layer, approximately 40 μm thick; (3) Polyamide-based ultra-thin separation layer, approximately 0.2 μm thick. Based on its performance structure, the possible reasons for damage to the membrane performance of reverse osmosis membranes include: (1) improper maintenance of new reverse osmosis membranes; (2) storage period exceeding 1 year despite proper maintenance; (3) improper maintenance of reverse osmosis membranes when the system is not in use; (4) ambient temperature below 5°C; (5) the system operating under high pressure; (6) improper procedures during shutdown. 2. Frequent changes in water quality lead to membrane fouling. Changes in the quality of the raw water compared to what was specified during design increase the pre-treatment workload. The presence of more impurities in the incoming water, such as inorganic substances, organic compounds, microorganisms, particles, and colloids, increases the likelihood of membrane fouling. 3. Film contamination caused by untimely cleaning and incorrect cleaning methods During use, in addition to the normal degradation of performance, untimely cleaning and incorrect cleaning methods are also important factors that lead to severe film contamination. 4. Incorrect dosing of chemicals: During the use of composite polyamide membranes, since these membranes have poor resistance to residual chlorine, disinfectants such as chlorine are not applied in the correct amounts. Additionally, users do not pay enough attention to preventing microbial contamination, which can easily lead to such contamination. 5. Membrane surface wear The membrane elements may become clogged by foreign substances or their surfaces may suffer wear (due to particles such as sand). In such cases, it is necessary to use detection methods to identify the damaged elements within the system, modify the pre-treatment process, and replace the membrane elements