The use of reverse osmosis chemicals must adhere to operational specifications based on chemical type (scale inhibitors, dispersants, cleaning agents, biocides, reducing agents, etc.) and system conditions. The core principles are “precise dosing, scenario adaptation, and parameter control.” Specific methods are as follows: Scale inhibitors are typically added continuously via metering pumps before the security filter in the reverse osmosis system, with a concentration of 3-8 mg/L. Dosage must be calculated based on feed water hardness and recovery rate to ensure effective protective film formation on the membrane surface. Cleaning agents require offline circulation cleaning: First identify contamination type (colloidal, metal oxides, etc.), select corresponding agent type (acidic/alkaline), dilute to 1%-3% concentration, then circulate within the membrane system via a cleaning pump for 1-3 hours at 20-40°C. After cleaning, flush with permeate water until neutral pH is restored. Disinfectants are categorized as oxidative and non-oxidative. Oxidative agents (e.g., sodium hypochlorite) are dosed intermittently to maintain residual chlorine at 0.1-0.5 mg/L. Non-oxidative agents (e.g., isothiazolinone) require periodic shock dosing at 50-100 mg/L, followed by 30 minutes of circulation. Reduction agents must be added before the security filter to neutralize residual chlorine in the feed water to <0.1 mg/L. Dosage should be adjusted based on residual chlorine concentration, typically 1-3 mg/L, to prevent excessive residue that could impair membrane performance. Prior to use, verify compatibility of all chemicals with membrane materials. Regularly monitor parameters such as permeate flux and pressure differential to optimize dosing protocols.

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