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QWhat is the quality of the water produced by a Seltra RO system?
AThe permeate typically has a conductivity below 10 µS/cm, and can reach below 1 µS/cm in double-stage configurations or with EDI polishing.
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QWhat filtration level do Seltra membranes offer?
A
Ultrafiltration membranes typically operate between 0.01 and 0.1 µm, while reverse osmosis membranes achieve more than 99 % salt rejection.DTRO modules are designed to withstand pressures up to 90 bar while maintaining stable performance.
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QWhat is the difference between UF, RO, DTRO, and NF?
A
UF (Ultrafiltration) removes suspended solids, colloids, and bacteria.RO (Reverse Osmosis) removes dissolved salts and low-molecular-weight organics.DTRO is a modular high-pressure variant ideal for high-concentration or high-salinity water.NF (Nanofiltration) selectively separates multivalent ions and salts, useful for hardness reduction and salt recovery.
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QWhat are the main applications of Seltra systems?
A
Seltra systems are used for ultrapure water production, process water recycling, desalination, and concentration of industrial solutions.They are applied in the chemical, pharmaceutical, electronics, energy, and wastewater treatment industries.
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QWhat is the correct shutdown procedure?
A
Stop the feed flow, allow the evaporation cycle to complete, discharge concentrate and condensate, then shut down the compressor, pumps, and vacuum system progressively.Never stop operation under vacuum with liquid inside the evaporator.
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QWhat if the distillate looks cloudy or discolored?
A
Inspect the condenser, check for foaming in the evaporator tank, and verify the gas–liquid separator’s efficiency. Run a CIP cleaning and replace any worn gaskets.
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QHow is the concentrate discharge phase managed?
A
The unit automatically discharges when the preset level or concentration is reached.Manual discharge can also be activated from the HMI panel for maintenance or testing.
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QHow can scaling on the heat exchanger be prevented?
A
Maintain periodic CIP cycles and operate within the recommended temperature and concentration ranges. PFET models drastically reduce scaling thanks to their polymer surface.
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QWhen should gaskets or main filters be replaced?
A
Gaskets should be inspected every six months and replaced if deformed or hardened.Inlet filters should be cleaned or replaced every 1–2 months, depending on wastewater quality.
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QHow is the liquid level inside the evaporator tank measured?
A
The level is detected by a float-type or vibrating-fork sensor, depending on the application.Periodic visual inspection and sensor integrity checks are recommended.
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QDoes the vacuum pump stop during operation?
A
No, the vacuum pump must run continuously to maintain pressure stability inside the system.The only exception is during the final concentrate discharge phase, when it is temporarily stopped to prevent air intake or pressure fluctuations.
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QWhat does a high-pressure alarm on the compressor mean?
A
It indicates excessive heat buildup in the refrigeration circuit.Check that the condenser is clean and that the cooling fan or water pump operates properly.
