In the use of reverse osmosis membrane equipment, if the reverse osmosis unit water production decreased by 10%, if the salt throughput doubled, or when the differential pressure drop doubled, it means that the reverse osmosis membrane needs to be cleaned (but note that the temperature drop in inch will also lead to a drop in water production, which is a normal phenomenon, in addition to periodic cleaning, in each start-up, it is best to run at low pressure for a few minutes to remove the reverse osmosis unit in the concentrated water and drain it away from the next stage unit.
1, physical cleaning methods
The simplest physical cleaning method is to use low pressure high flow rate into the membrane through the water rinse for 30 minutes, which can make the membrane permeability can be restored to a certain extent, but for a longer period of time, the permeability is still declining, but also can be mixed with water and air fluids at low pressure rinse the membrane surface for 15 minutes, with this method of cleaning the membrane initially contaminated by organic matter is Effective.
2, chemical cleaning methods
ProtecMBC? 1511 reverse osmosis cleaning agent use(1) check the cleaning tank, piping and security filters, if necessary, load a new cartridge;
(2) the appropriate amount of reverse osmosis water into the cleaning tank;
(3) according to the calculation of the amount of dosage of slow dosing (4) cycle cleaning, every 5-20 minutes to measure the PH; when the PH rises to 4 or more, add a certain amount of detergent or acid. Until the pH does not continue to rise, indicating the end of the cleaning;
(5) If the contamination is serious, sometimes it is necessary to completely empty the first batch of cleaning fluid to prevent the re-deposition of pollutants; then re-formulate the cleaning fluid;
(6) During the cycle, pay attention to the temperature rise, do not exceed the specified temperature.