Parker AQUA DUO A455C-2800, Technical Manual

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Constituent Ion/Molecule Maximum Limits (ppm)
Magnesium 30
Calcium 75
Calcium Carbonate 100
Iron .1
Manganese .05
Total Dissolved Solids 500
Turbidity 5
Oil .1
Detergents (anionic) .2
Phenols .001
Bacteria - E Coli (per 100 ml) 0
Table 3.0 - Drinking Water Standards
3.3 FACTORS AFFECTING PERMEATE PRODUCTION
VARIATIONS IN TEMPERATURE, PRESSURE AND SALINITY: The following table illustrates how the quality
and quantity of permeate produced by the RO system is affected by changes in temperature, salinity, and
pressure:
With constant.... And increasing....
Permeate
TDS
Capacity
Salinity and Pressure
Temperature and Pressure
Temperature and Salinity
Temperature
Salinity
Pressure
Increases
Increases
Decreases
Increases
Decreases
Increases
Table 3.1: Factors Affecting Permeate Quality
Note
If feedwater salt concentration decreases, the product water flow rate should not be allowed
to increase more than 20% above rated flow. Membrane Reject pressure will need to be
lowered to maintain rated flow in brackish water or freshwater applications.
The RO system can be adjusted to maintain a constant permeate output when feedwater salinity
is below nominal (near river mouths or in estuaries). The operator can do this by controlling system
pressure manually via the back-pressure regulator valve, located in the system brine piping. For long
pump life and low membrane fouling, Parker recommends that 9 psi is not exceeded except in
situations of extreme low temperature feed water.
CAUTION