The recovery rate of reverse osmosis equipment is mainly determined by factors such as the length of membrane element series connection, whether there is concentrated water circulation, and the size of circulating flow rate.

Due to the large number of membrane components and long feed water path, the actual system recovery rate of large-scale reverse osmosis equipment is generally above 75%, and sometimes even up to 90%. For small-scale reverse osmosis equipment, a high system recovery rate is also required to avoid wasting water resources.

How to calculate the recovery rate for multi-stage reverse osmosis equipment and make different regulations according to different situations. For primary reverse osmosis, the # # recovery rate (r1) r1=# # water production/# # water inflow # #; The recovery rate of the second stage reverse osmosis is r2=second stage water production/second stage water inflow # #. The recovery rate of secondary reverse osmosis is not obtained by multiplying the recovery rates of two levels of reverse osmosis systems. The concentrated water in the second stage reverse osmosis system has not been discharged, but has returned to the inlet of the first stage reverse osmosis. Therefore, the recovery of multi-stage reverse osmosis equipment should be calculated according to the following standard: system recovery rate=total water production/total inflow # #.

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