WELCOME TO OUR WEBSITE !    |   ABOUT US   |   BLOG   |   CONTACT US
You are here: Home » Blog » Knowledge » 6 Typical RO Chemical Cleaning Methods

BLOG SEARCH

6 Typical RO Chemical Cleaning Methods

Views:1630     Author:Kevin Chen     Publish Time: 2020-07-08      Origin:Site

6 Typical RO Chemical Cleaning Methods


ro-2-e1587630694352




PollutantGeneral characteristicsCleaning method
Inorganic salt precipitateDesalination rate decreased significantly, system pressure drop increased, and system water production decreased slightly2% 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 significantlyAmmonia 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 reducedSulphuric 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 sulphateDesalination rate decreased significantly, system pressure drop slightly or moderately increased, system water production decreased slightlypH 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 depositionDesalination rate may decrease, system pressure drop gradually increases, system water production gradually decreasespH 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 pollutionDesalination rate may decrease, system pressure drop may increase significantly, system water production volume may decrease significantlypH 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


Shanghai CM Environmental Technology Co., Ltd. is a high-tech enterprise specializing in reverse osmosis membrane, ultrafiltration membrane, nanofiltration and MBR membrane assembly, membrane production and sales service, and also a system design and proprietary service provider. 

INFORMATION

CATEGORIES

CONTACT US

 (+86)-21-34501290
 Kaimi : (+86)-18221094035
 kaimi@shchenmo.com
     sales@shchenmo.com
 Room502 Building 1#168 Jixin Road Minhang Shanghai China