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6 Typical RO Chemical Cleaning Methods

Views:1632     Author:Kevin Chen     Publish Time: 2020-07-08      Origin:Site

6 Typical RO Chemical Cleaning Methods


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Pollutant General characteristics Cleaning method
Inorganic salt precipitate Desalination rate decreased significantly, system pressure drop increased, and system water production decreased slightly 2% citric acid solution, Ammonia adjusted pH 4.0, temperature 40 ℃;
It can also be cleaned with hydrochloric acid aqueous solution with pH 2 ~ 3 (0.5%)
Oxide/hydroxide Objects (iron, nickel, copper, etc) Desalination rate decreased significantly, system pressure drop increased significantly, and system water production decreased significantly Ammonia adjusted pH 4.0, 2% citric acid solution, temperature 40 ℃;
Sometimes it can also be cleaned with a hydrochloric acid aqueous solution of pH 2 ~ 3 (0.5%)
Various colloids (iron, organics and silica gel) The desalination rate is slightly reduced, the system pressure drop is gradually increased, and the system water production is gradually reduced Sulphuric acid adjusts the pH value to 10.0, 2% sodium tripolyphosphate (STTP) solution,
Temperature 40 ℃; sometimes it can be cleaned with aqueous NaOH solution with pH less than 10
Calcium sulphate Desalination rate decreased significantly, system pressure drop slightly or moderately increased, system water production decreased slightly pH value 10.0, 2% sodium tripolyphosphate solution, 0.8% EDTA (ethylenediaminetetraacetic acid) tetrasodium (replace with 0.25% sodium dodecylbenzenesulfonate in severe cases), temperature 40 ℃; sometimes it can also use PH<10 NaOH aqueous solution cleaning
Organic deposition Desalination rate may decrease, system pressure drop gradually increases, system water production gradually decreases pH value 10.0, 2% sodium tripolyphosphate solution, 0.8% EDTA (ethylenediaminetetraacetic acid) tetrasodium (replace with 0.25% sodium dodecylbenzenesulfonate in severe cases), temperature 40 ℃
Bacterial pollution Desalination rate may decrease, system pressure drop may increase significantly, system water production volume may decrease significantly pH value 10.0, 2% sodium tripolyphosphate solution, 0.8% EDTA (ethylenediaminetetraacetic acid) tetrasodium (in severe cases, replace with 0.25% dodecylbenzenesulfonic acid Na-DDBS), temperature 40 ℃;
0.1% NaOH and 0.03% sodium dodecyl sulfonate (SDS), PH = 11.5


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