Circulating cooling sewage is the main part of power station discharge, and its reuse becomes the key to realize zero discharge of power station. One of the characteristics of cooling circulating sewage in thermal power plants is that it has a large amount of water, high hardness, alkalinity and salinity, and contains certain suspended solids, colloids, organic matter, bacteria and clay. It is a variety of harmful ingredients. Therefore, when sewage water is recycled, we should comprehensively consider various influencing factors and use indicators and design reasonable treatment methods. In view of the water quality of cooling water circulating sewage from a power plant in Shandong, we put forward a reverse osmosis treatment process, and conducted a series of tests, and reached a conclusion:

(1) operating conditions have great influence on the separation performance of reverse osmosis membrane, in which the water flux increases with the increase of pressure and inlet temperature. The density of water decreases with the increase of operating pressure, but increases with the increase of inlet water temperature. In the first step of this experiment, the suitable operating pressure is 65438±0.0 MPas and the inlet water temperature is 30℃. The model can well explain the influence of operating conditions on the separation performance of seawater desalination capacity LFC65 438+0 anti-pollution membrane.

(2) The factors that affect the service life of reverse osmosis membrane are membrane pollution and poor pressure resistance, etc .. Choosing an appropriate membrane cleaning method according to the pollution source and pollutant characteristics of raw water is one of the measures to prevent membrane pollution and prolong membrane life. The pollutants that distinguish the membrane are mainly calcium carbonate deposits, followed by some microorganisms and organic matter. In addition, reasonable operating pressure, inlet water temperature and inlet water pH value are the preventive measures to alleviate membrane pressure impermeability and thickening performance and prolong membrane life.

(3) After the cooling water is treated by reverse osmosis membrane, it is recycled to discharge sewage, and its water quality can completely meet the requirements of circulating cooling water replenishment. The development of this treatment process can bring considerable economic and social benefits to customers.