Airtec RO Plus l - Supply Water Requirements for Humidification Systems

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4. Datasheet
4.2 Supply water requirements for humidication systems
The performance and safety of a humidication system is depending on a clean water supply. Below table is showing the minimum requirements for a water supply.
These water parameters do not exclude the need for dierent type of water treatment. This only represents an acceptable baseline.
Name Chemical code Value Drinking water limits Comments
Physical/chemical parameters
Iron Fe Mg/l 0,2 High level, add iron lter
Manganese Mn Mg/l 0,05
Calcium Ca Mg/l 200 See Hardness
Magnesium Mg Mg/l 50
Sodium Na Mg/l 175
Potassium K Mg/l 10
Ammonium NH₄ Mg/l 0,05
Chloride Cl
-
Mg/l 250
Nitrate NO₃ Mg/l 50
Flourine F Mg/l 1,5
Nitride NO₂ Mg/l 0,1
Hydrogen sulde H₂S Mg/l 0,05
Methane CH₄ Mg/l 0,01
Chlorine (Free chlorine) Cl Mg/l 0,1 High level, add carbon lter
Potassium permanganate KMnO₄ Mg/l 10
pH 7 to 8.5
Conductivity µS/cm Min. 300, max. 1000 5 to 30, system recommended. RO ltration
Hardness dH⁰ 30 > 3 recommend Softening system
Temp ⁰C 12
Color of the water Mg Pt/l 15
NTU Max 1
Silt density index SDI Max 3
Microbiological parameters
Coliform bacteria Non
Bacteria, 37 ⁰C 20/ml
Bacteria, 22 ⁰C 200/ml
Short description to Physical/chemical parameters.
Hardness:
Iron, manganese, calcium and magnesium are all part of total water hardness. So to determine what softener to choose, you need:
• dH° + Iron + Manganese
or
• Calcium + Magnesium + Iron + Manganese.
Max value is in the diagram above.
If the hardness is present in another value than dH°, you need to convert it from for example: gr/gal or mmol.
Sodium Na
+
:
Sodium is element no. 11 in the periodic system. Normally it is present in water as SodiumChloride, or SodiumBicarbonate (salt and soda).
Sodium can be removed with RO water ltration with up to 99% removal.
Atomized Sodium in high consentration can be visible as white shiny dust
Potassium K
+
:
Potassium in the water can be sign of pollution of some kind. Otherwise there is no taste, health or disadvantage with a level above drinking water standart max value. <
10mg/l.
201218