Borehole water treatment with one step nano filtration
East Asia Solutions has given Nijhuis Industries and NXF Filtration the order to realize a plug and play Direct Nano Filtration installation to treat borehole water for the city of Davao, the Philippines.
The installation will be delivered as a plug and play packaged unit to treat the borehole water. The solution is part of a larger project to increase the fresh water availability for the city of Davao.
Borehole water is pumped towards and collected in a feed buffer tank. The unit is now being commissioned and will take raw water from this buffer tank and pump it to the nano filtration membranes.
One step filtration
The Direct Nano Filtration membrane technology combines particle removal, color removal, softening, and partial desalination. Additionally, with the nano filtration technology the installation of a sand filter as pre-treatment is not necessary, turning borehole water into drinking water in one step.
The dNF membranes are positioned in combined parallel and serial configuration with low energy crossflow applied.
Higher hydraulic recovery
The dNF has been developed for a 75 to 90 percent hydraulic recovery of the borehole water.
Nano filtration is a pressure related process, during which separation takes place, based on molecule size. Membranes bring about the separation in a permeate (clean water) and a concentrate (pollution). Nano filtration produces a high permeate volume. This means a higher recovery compared to existing technology it replaces, meaning a three step combination of sand filter, spiral wound nano filtration and reverse osmosis.