How is the reverse osmosis membrane of purified water equipment cleaned?

Physical cleaning method: 1. The stop device slowly reduces the operating pressure and gradually stops the device, because if the sudden stop device causes the pressure in the device to drop rapidly to form a water hammer, the impact on the pipe, pressure vessel and membrane components caused some damage.
2. The regulating valve first opens all the water valves in the thick solution, then closes the inlet valves, and then opens the water-producing valves to large.
if the order of closing the valve is wrong, back pressure may cause electrical damage to the membrane elements at the rear end of the pressure vessel.
3. The cleaning operation first opens the low-pressure cleaning pump, and then slowly opens the ining water valve, at this time must pay attention to observe the flow of the concentrated water flow meter;
chemical cleaning method: chemical cleaning method is the use of chemical agents for cleaning, for different pollutants to choose different chemical agents, the following will also introduce to you what pollutants choose what chemical agents.
1, citric acid cleaning before cleaning with citric acid solution, the membrane element is rinsed with softened water or RO product water.
add citric acid (white powder) to the cleaning tank and continuously stir the solution so that it dissolves quickly and adequately, resulting in a concentration of 2% of the citric acid solution (mass percentage).
to break large pieces of the medicine before adding it to avoid damage to the agitator and water pump.
2, sodium tyrannate (Na-SDS) cleaning preparation 0.025% (mass percentage concentration) sodium duotan sulfonate and 0.1% (mass percentage concentration) NaOH solution, control solution temperature is less than 30 degrees C, its pH control range is within pH12.
this method as a step chemical cleaning of the system.
3, hexalysed sodium phosphate plus hydrochloric acid cleaning to the water to add SHMP (white powder), small batch gradually added to achieve 1.0% concentration (mass percentage) solution.
use a blender to continuously stir the solution so that the chemicals are mixed evenly.
slowly add hydrochloric acid (HCl) to the SHMP solution until the pH of the solution reaches 2.
hydrochloric acid (HCl) is a corrosive inorance acid, when dealing with hydrochloric acid should pay attention to safety rules.
pH of the solution should be close, but greater than 2.
if the pH of the solution increases by more than 3.5 during cleaning, add hydrochloric acid (HCl) until the pH value is exactly greater than 2.
if the pH is reduced to less than 2, use NaOH to adjust.
NaOH is a corrosive inorance alkali that should be used with safety rules in mind.
cleaning procedure of the reverse osmosis membrane: 1, pump clean, free chlorine-free pure water from a specific inflow into the pressure vessel and discharge for a few minutes.
2, with clean pure water in the cleaning tank to make cleaning liquid, because for different membranes or different contaminants need different cleaning liquid.
3, circulate the cleaning fluid in the pressure vessel for 1 hour or a pre-set time.
4, after cleaning, drain the cleaning box and rinse, and then fill the cleaning box with clean product water for the next flushing.
5, pump clean, free chlorine-free product water from the cleaning tank (or the corresponding water source) into the pressure vessel and discharge for a few minutes.
6, after flushing the RO reverse osmosis membrane system, run the reverse osmosis system with the product water drain valve open until the product water is clean, foam-free or clean (usually 15-30 minutes).