Abstract: Reverse osmosis membrane separation technology has been widely used in reclaimed water production. Extending the service life of reverse osmosis membrane can effectively reduce the equipment procurement cost of reclaimed water production enterprises. Taking a double-membrane reclaimed water plant in Tianjin as an example,this paper conducts research from three aspects：inlet water analysis,membrane module engineering adjustment,and membrane system cleaning and maintenance,and looks for operational measures to effectively extend the service life of reverse osmosis membrane.

Key words: reverse osmosis, reclaimed water, cost reduction and efficiency, membrane cleaning