Salt Separation Services were approached to design and manufacture a 30ft containerised RO plant to treat MBR (membrane bio reactor) permeate. The required capacity was 30 m³/h of permeate operating at a recovery of 75%.The RO permeate was treated with UV disinfection prior to it being re-used on-site.
A three stage RO system was designed utilising 45 fouling resistant membranes, to enable the required product quality to be achieved whilst operating at a recovery of 75%.
During trials there were issues due to rapid scaling of the third stage RO membrane elements. It was subsequently necessary to include it acid dosing into the MBR permeate to control the RO reject pH and prevent calcium phosphate scale deposition.