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How to compare immersed UF flux and air scour
Normalize membrane area, duty cycle and air demand when reviewing immersed UF proposals.
HOSON WATER editorial ·
Keep gross and net flux separate
Gross filtration flux relates the flow during production to active membrane area. Net productivity also reflects backwash, relaxation and cleaning losses. Ask each supplier to report installed area, duty area and reserve area separately. Use the same feed temperature and quality assumptions for comparing module quantities. Confirm the duty period over which the supplier measures its net figure.
Read air demand in the context of the cycle
Review the proposed airflow, pressure at delivery and timing for each rack. Establish whether quoted air demand is instantaneous or averaged over a cycle. Define the blower supply scope and power measurement boundary. Confirm how the system will maintain airflow distribution when a rack is isolated or several trains share a blower.
Use the pilot to check practical operation
Track permeate flow, transmembrane pressure, temperature and cleaning recovery at a representative duty. Confirm each alarm and the operating response when air or water levels are outside range. Pilot data can help decide whether the selected flux and cleaning interval are compatible with the owner’s staffing and uptime goals.