Reverse osmosis equipment is a water treatment device that uses a high-pressure pump to separate water molecules from a solution, and is widely used in industrial, medical, drinking, and other fields. The advantage of reverse osmosis equipment is that it can effectively remove impurities such as organic matter, inorganic matter, bacteria, viruses, etc. from water, improving water quality and quantity. However, reverse osmosis equipment also has a disadvantage, which is that it cannot be stopped for a long time, otherwise it will lead to a decrease in equipment performance or even damage.
So, what should be noted during the shutdown of reverse osmosis equipment? How to manage and maintain correctly? Today, I am here to share some professional knowledge and experience with you, hoping to be helpful. 1、 The management methods during the shutdown period can be divided into three types based on the length of shutdown: daily shutdown (0-48 hours). Daily shutdown refers to the situation where the reverse osmosis equipment temporarily stops running for some reason after normal operation, generally not exceeding 48 hours. In this case, the management method of reverse osmosis equipment is relatively simple, mainly consisting of the following steps: stop water inlet and production, close the inlet valve, production valve, and concentrate valve, keep the reverse osmosis membrane element filled with water, and prevent membrane element drying and microbial growth. Rinse the reverse osmosis system with low-pressure water to remove impurities and concentrated water from the system, preventing membrane element blockage and contamination. Repeat the above operation every 24 hours to keep the reverse osmosis system clean and moist. Short term shutdown (2-25 days) refers to the situation where reverse osmosis equipment stops running for a long time due to certain reasons after normal operation, usually between 2-25 days. In this case, the management method of reverse osmosis equipment is relatively complex, mainly consisting of the following steps: stop water inlet and production, close the inlet valve, production valve, and concentrate valve, keep the reverse osmosis membrane element filled with water, and prevent membrane element drying and microbial growth. Prepare a formaldehyde solution with a concentration of 0.5-0.7% using reverse osmosis product water, adjust the pH between 5-6, and use it as a preservative. Start the cleaning water pump to flush the reverse osmosis system at a flow rate of 45-58m3/h, filling the reverse osmosis membrane elements and pipelines with preservatives to prevent oxidation and biological contamination of the membrane elements. Repeat the above operation every 5 days to maintain the cleanliness and anti-corrosion of the reverse osmosis system. Long term shutdown (exceeding 25 days) refers to the situation where reverse osmosis equipment stops operating for a long time due to certain reasons after normal operation, usually exceeding 25 days. In this case, the management method of reverse osmosis equipment is quite complicated, mainly consisting of the following steps: stop water inlet and production, close the inlet valve, production valve, and concentrate valve, keep the reverse osmosis membrane element filled with water, and prevent membrane element drying and microbial growth. Prepare a formaldehyde solution with a concentration of 0.5-0.7% using reverse osmosis product water, adjust the pH between 5-6, and use it as a preservative. Start the cleaning water pump to flush the reverse osmosis system at a flow rate of 45-58m3/h, filling the reverse osmosis membrane elements and pipelines with preservatives to prevent oxidation and biological contamination of the membrane elements. Remove the reverse osmosis membrane element from the pressure vessel, rinse it with clean water, place it in a plastic bag, add preservatives, seal and store it to prevent the membrane element from being affected by external factors. Rinse the pressure vessel and pipeline with clean water, add preservatives, seal and store to prevent corrosion and contamination of the pressure vessel and pipeline.
2、 During the shutdown period of reverse osmosis equipment, in addition to following the above management methods, attention should also be paid to the following aspects: when using preservatives, wear protective equipment, avoid contact with skin and eyes, and prevent poisoning and irritation. When using preservatives, attention should be paid to the expiration date of the preservatives. Expired preservatives cannot be used, otherwise it will affect the anti-corrosion effect. When using preservatives, attention should be paid to the concentration and pH value of the preservatives. Excessively high or low concentrations and pH values can cause damage to the reverse osmosis membrane components. When using preservatives, attention should be paid to the temperature of the preservatives. Excessive or insufficient temperature can affect the stability and activity of the preservatives. When using preservatives, attention should be paid to the circulation time of preservatives, as too long or too short a circulation time can affect the anti-corrosion effect. When using preservatives, attention should be paid to the storage conditions of preservatives, avoiding direct sunlight and high temperature and humidity to prevent preservatives from deteriorating and becoming ineffective. When using preservatives, attention should be paid to the amount of preservatives used, following the instructions and avoiding excessive or insufficient amounts to prevent waste and insufficiency. When using preservatives, attention should be paid to the discharge of preservatives, and environmental regulations should be followed. Do not discharge them indiscriminately to prevent environmental pollution and ecological harm.
3、 Preparation before restart: During the shutdown period of the reverse osmosis equipment, if it needs to be restarted, the following steps of preparation should be carried out: check the various components of the reverse osmosis equipment for any damage, looseness, water leakage, or other abnormal situations, and replace or repair them in a timely manner. Check the power supply, water source, instruments, valves, etc. of the reverse osmosis equipment to ensure they are working properly, and adjust or replace them in a timely manner. Check the water quality of the reverse osmosis equipment to ensure it meets the requirements of the reverse osmosis membrane components, and promptly handle or replace it. Check the anti-corrosion agent of the reverse osmosis equipment for expiration, deterioration, and failure, and replace or dispose of it in a timely manner. Rinse the reverse osmosis system with clean water to completely remove the preservative and prevent it from affecting the reverse osmosis membrane components and product water. Prepare a citric acid solution with a concentration of 0.1-0.2% using reverse osmosis product water, adjust the pH between 3-4, and use it as a cleaning agent. Start the cleaning water pump and clean the reverse osmosis system at a flow rate of 45-58m3/h. Fill the reverse osmosis membrane elements and pipelines with cleaning agent to remove scale and sediment on the membrane elements.
Rinse the reverse osmosis system with clean water to completely discharge the cleaning agent and prevent it from affecting the reverse osmosis membrane components and product water. Restore the normal operation of the reverse osmosis equipment, adjust the operating parameters, test the operating effect, and ensure the performance and quality of the reverse osmosis equipment. The above is my introduction to the management methods and precautions during the shutdown of reverse osmosis equipment, hoping to be helpful to everyone.
