Bank filtration schemes for the production of drinking water are increasingly affected by constituents such as sulphate and organic micropollutants (OMP) in the source water. Within the European project AquaNES, the combination of bank filtration followed by capillary nanofiltration (NF) is being demonstrated as a potential solution for these challenges at pilot scale. As the bank filtration process reliably reduces total and dissolved organic carbon (TOC/DOC), biopolymers, algae and particles, membrane fouling is reduced resulting in a long term stability of operation of the NF. With the new developed membrane module for capillary NF a reduction of sulphate, selected micropollutants (depending on size & charge) and hardness can be achieved together with further removal of DOC. Dissolved iron and manganese concentrations in bank filtrate were not a problem for the capillary NF under anoxic conditions with a good cleaning concept including backwash with anoxic permeate, forward flush and chemical cleaning.

Bank filtration schemes for the production of drinking water are increasingly affected by constituents such as sulphate and organic micropollutants (OMP) in the source water. Within the European project AquaNES, the combination of bank filtration followed by capillary nanofiltration (capNF) is being demonstrated as a potential solution for these challenges at pilot scale. As the bank filtration process reliably reduces total organic carbon and dissolved organic carbon (DOC), biopolymers, algae and particles, membrane fouling is reduced resulting in long term operational stability of capNF systems. Iron and manganese fouling could be reduced with the possibility of anoxic operation of capNF. With the newly developed membrane module HF-TNF a good retention of sulphate (67–71%), selected micropollutants (e.g., EDTA: 84–92%) and hardness (41–55%) was achieved together with further removal of DOC (82–87%). Fouling and scaling could be handled with a good cleaning concept with acid and caustic. With the combination of bank filtration and capNF a possibility for treatment of anoxic well water without further pre-treatment was demonstrated and retention of selected current water pollutants was shown.