The recovery rate of RO membrane-refers to the percentage of feed water converted into product water or permeate in the reverse osmosis membrane system. Depends on the pretreatment influent water quality and water requirements in the reverse osmosis system. The recovery rate of the RO membrane system has been determined at the time of design.
(1) Recovery rate of RO membrane = (Production water flow rate of RO membrane/Inlet water flow rate) × 100%
(2) The calculation formulas for the recovery rate, salt permeability and desalination rate of reverse osmosis (nanofiltration) membrane modules are as follows:
Recovery rate of reverse osmosis membrane module = RO membrane module water production/intake water×100%
Salt permeability of reverse osmosis membrane module = RO membrane module product water concentration/influent water concentration × 100%
