Pura QCRO4V-50 Spezifikationen PDF herunterladen (Seite 23)

The performance of the PURA system can be characterized and judged by the quality and quantity of the water

produced by the system. By measuring the contaminant removal performance and flow rates of the system, its operating

status can be easily evaluated.

Factors Which Affect Performance

Performance of the reverse osmosis membrane is affected by several factors which must be considered when judging the

condition of the system. The main factors which affect system performance are pressure, temperature, total dissolved solids

level, recovery and pH.

Pressure

Water pressure affects both the quantity and quality of the water produced by the RO membrane. Generally, the

more water pressure, the better the performance of the system. Be careful not to go below 40 psi or exceed 100 psi, the

minimum and maximum operating pressure of the system.

Temperature

The reverse osmosis process slows with decreasing temperature. To compensate, a temperature correction factor is

used to adjust the actual performance of the RO membrane filter to the standard temperature of 77°F (25°C). This allows

the performance of the unit to be accurately gauged against published standards. Temperature does not affect the

concentrate flow rate.

Total Dissolved Solids

The minimum driving force which is necessary to stop or reverse the natural osmosis process is termed osmotic pressure. As

the total dissolved solids level of the feed water increases, the amount of osmotic pressure increases and acts as back

pressure against the reverse osmosis process. Osmotic pressure becomes significant at TDS levels above 500 mg/L (ppm).

Hardness

Hardness is the most common membrane foulant. If ignored, this relatively harmless component of feed water will scale

a membrane over time. Use of a softener will reduce the fouling effect on a membrane. One way to detect too much

hardness in the feed water is the weight of a membrane installed for a period of time. A fouled membrane (dried) will

weigh significantly more than a new membrane. The increase in weight is a result of precipitated hardness inside the

membrane.

Iron

Iron is another common membrane foulant. There are a variety of types of iron, some of which cannot be removed by

an iron filter. Clear water iron can be removed more effectively by a softener. Particulate iron can be removed more

effectively by a 1 micron filter. Organic-bound iron can be removed only by activated carbon or macroporous anion

resin. If there is enough iron to exceed the EPA secondary drinking water standard and softening the water is not an

option and the iron is soluble, then an iron filter is appropriate. If none of these are an option then regular replacement of

membranes will have to be accepted.

NOTE: Increased weight of the RO cartridge may be a foulant other than hardness.

Product Water Recovery

Product water recovery plays an important role in determining membrane and system performance. Recovery refers to

the amount of water produced in relation to the amount of water sent to drain. The standard calculation is:

% Recovery = Product Water ÷ (Product Water + Waste Water) x 100

The system uses a flow control assembly to restrict the flow of waste water to the drain. This restriction helps maintain

pressure against the membrane. The sizing of the flow control assembly determines the recovery rating of the system. The

system is manufactured with a recovery rating designed to be around 25%. Depending on temperature, pressure and

tolerances the actual recovery value may be slightly different for each system.

Performance Measurements

When collecting water samples from the manifold, insert a short 2”-3” length of tubing into the fitting on the manifold to

catch the water sample.

TDS can be measured with an electronic TDS meter. PN 66760

Performance & Technical Information

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