Common Pollutants of Reverse osmosis Membrane Elements and Their Removal Methods

1, calcium carbonate scale
In this case,
In the case of a scale inhibitor addition system failure or the presence of an acid addition system leading to an increase in the feedwater pH, calcium carbonate is likely to be deposited and precipitated as soon as possible to prevent the formation of calcium carbonate scale deposits on the surface of the membrane Damage, such as early detection of calcium carbonate scale, can be used to reduce the water PH to 3.0 ~ 5.0 run between 1 to 2 hours to remove. For longer settling time of calcium carbonate scale, you should use a citric acid cleaning solution for circular cleaning or overnight soaking.
In this case,
Note: should ensure that any cleaning solution PH not less than 2.0, the cup may be RO membrane element damage, especially at higher temperatures should pay attention to the highest PH should not be higher than 11.0. Check the use of ammonia to improve the PH, the use of sulfuric acid or hydrochloric acid to reduce the PH value.
In this case,
2, calcium sulfate scale
In this case,
The cleaning solution is the best way to remove calcium sulfate from the reverse osmosis membrane surface.
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3, metal oxide scale
In this case,
The deposited hydroxides (e.g., ferric hydroxide) can be readily removed using the above-described method of removing calcium carbonate scale.
In this case,
4, silicon scale
In this case,
For silica fouling that does not coexist with metal or organic matter, they are usually removed only by a special water treatment. For details, please contact a water treatment specialist.
In this case,
5, organic sediments
In this case,
Organic sediments (eg microbial slime or mildew) can be removed using Cleaning Solution 3. To prevent further reproduction, use an approved sterilization solution to circulate and soak in the system. Generally, it takes a long time for immersion to be effective, such as reverse osmosis Disinfection should be used for three days after disinfection. Consult a water treatment specialist to determine the appropriate biocide.
In this case,
6, cleaning fluid
In this case,
Cleaning of reverse osmosis membrane components recommended for water treatment dedicated cleaning fluid. It is important to determine the chemical analysis of the contaminants before cleaning. A detailed analysis and comparison of the analytical results ensures that the best cleaning agent and cleaning method are selected. The cleaning method and cleaning results obtained during each cleaning should be recorded. Water supply conditions, to find the best cleaning methods to provide the basis.
In this case,
For cleaning of inorganic contaminants, calcium sulphate and organic matter, as well as cleaning fluids used for serious organic contamination, all cleaning can be carried out at a maximum temperature of 104 ° C (40 ° C) for 60 minutes at a rate of 100 gallons Liter). When preparing the cleaning solution, add the medicine and cleaning water proportionately. The reverse osmosis product water without free chlorine should be used to formulate the solution and mix it evenly.
In this case,
Chemical cleaning and water flushing of reverse osmosis membrane
In this case,
During cleaning, the cleaning solution is circulated on the high pressure side of the membrane at a low pressure and a large flow rate, and the membrane element is still loaded in the pressure vessel and a special cleaning device is required to complete the work.