Description of unit
The unit consist of three sections (see diagram). The central membrane chamber is flanked on both sides by a sediment filter and an activated carbon filter. The unit is also fitted with a flow regulator, this ensures that the quantities of permeate (usable water) and concentrate (waste water) are balanced and ensure the best conditions for the membrane.
Membrane.
The membrane is supplied separate and needs to be installed before operation. The membrane is dry preserved. This method has advantages over the older wet preservation method and means that the membrane can be stored for longer and prevents damage by frost in winter.
Filter
A sediment pre-filter and an activated carbon filter are fitted as standard. This means that the unit maybe used irrespective of sediment and chlorine content of the untreated water provided it conforms to European drinking water standards.
The water should always flow through the activated carbon filter before the sediment pre-filter. This prevents any dusts from the carbon which may shake loose during transport reaching the membrane and reducing performance.
TECHNICAL DATA OF MEMBRANE
MEMBRANE
Type – TFC (Thin Film Composite)
Material – PA (Polyamide)
Charge – Negative
Configuration – Spiral-wound, Tapping
PERFORMANCE (NORMINAL)
Flux – 50gpd (189L/day)
Salt Rejection – 96%
The stated performance is initial data taken after 30 minutes of operation based on the following conditions.
Concentration – 250ppm NaCl
Pressure – 60psig
Temperature – 77oF (25oC)
Recovery -15%
pH Range – 6.5 ~ 7.0
PERFORMANCE IN PRACTICE
Approximately between 120 – 160litre in 24 hours at a room temperature of between 10oC and 15oC and a pressure of 3-6 bar. Higher temperature and pressure result in higher performance.
OPERATING LIMITS
Max. Operating Pressure – 125psi (0.86MPa)
Max. Feed Flow Rate – 3gpm (0.45m3/hr)
Max. Operating Temperature – 113oF (45oC)
pH – 3.0 ~ 10.0
Chlorine Concentration - <0.1ppm
INFORMATION
Permeate flow rate is based on standard test conditions and may vary depending on feed water quality. Individual elements permeate flow may vary ±15%.
NOTICE
Elements contain preservative solution, therefore the permeate from the first hour of operation should be discarded.