TREATMENT OF RESERVOIR WATER USING DISSOLVED AIR FLOTATION AND IMMERSED MEMBRANE: FROM PILOT SCALE TO 60 MLD WTP IN MACAO

摘要

As part of Macao MSR Water Treatment Works (WTW) extension, a 9 months pilot study was performed in order to study and validate the operating conditions of the future water treatment line, which combines dissolved air flotation (Degremont AquaDAF~?) and ultrafiltration (Zenon membranes). The UF experiments were carried out with low energy immersed polyvinylidene fluoride (PVDF) ultrafiltration membrane process that consists of outside-inside filtration. The 9 months pilot study allowed to validate the combination AquaDAF~? - Zenon for drinking water production in design condition defined for the new WTP. No serious damage of membrane was revealed by membrane autopsy even if the experience gain on Zenon membrane ageing is not sufficient through out 9 months pilot study to conclude on membrane replacement frequency.