IMMERSED MEMBRANE FILTRATION FOR THE PRODUCTION OF DRINKING-WATER - CASE-STUDIES

This paper presents the application of a new immersed microfiltration membrane through two case studies: Rothesay (New Brunswick) and Collin gwood (Ontario), Canada. Both of these municipal plants are equipped w ith membrane clarification processes based on ZeeWeed(R), a shell-less , outside-in hollow fibre membrane immersed into a process tank. Direc t filtration results were illustrated using the Collingwood plant. The first year of operation, with water temperature as low a 1 degrees C, has demonstrated the low fouling tendency associated with low transme mbrane pressures. The permeate quality was excellent with on-line part icle counts (>2 mu m) below 2 per ml. The Rothesay plant was used as a n example of combining oxidation for iron and manganese removal with i mmersed membrane filtration. Without sophisticated process control, a treated manganese level of 0.02 mg/l was achieved with highly variable feed values of up to 1.5 mg/l.