| 摘要 |
Water from a source is fed to a reverse osmosis unit having a membrane which divides the stream into a first permeate product and a first concentrate. The first permeate product is stored in a tank until a selected quantity is collected and then the source is disconnected from the pump which next delivers water from the tank to the reverse osmosis unit to divide the stream into a second permeate product and a second concentrate. In one version of the equipment the second permeate is processed by a different membrane than that producing the first permeate. In another version, the same membrane is used, the second permeate product is stored, and the second permeate product is later run through the reverse osmosis unit to produce a third permeate product and a third concentrate. A further version, especially applicable to processing other water sources intruded by sea water, is somewhat like the first version except only one membrane is used and a second permeate product is added to a first permeate product in a storage tank until a product of a satisfactory level of salinity is reached. The addition of the second permeate to the first permeate may be thought of as a dilution step in processing. In all versions of the system, only a single pump is used to convey and pressurize the liquids. Control of some tank-filling and tank-emptying operations is achieved by use of float-operated switches and time-delay units are associated with those switches in order to eliminate effects of sloshing on the switches.
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