Seawater reverse osmosis desalination and seawater concentration method by using concentration polarization and periodic instantaneous flushing principle

Abstract

The invention discloses a seawater reverse osmosis desalination and seawater concentration method by using concentration polarization and a periodic instantaneous flushing principle. The method comprises the following steps: extracting pre-treated seawater from a seawater tank by using a seawater pump through an opened seawater inlet electric adjusting valve and a seawater inlet electromagnetic valve, and then feeding the extracted seawater into a reverse osmosis membrane core, wherein along with the fact that fresh water in the seawater is reversely permeated to a fresh water area from the reverse osmosis membrane core gradually, the later the section of the reverse osmosis membrane core is, the higher the concentrations of impurities and salts in the seawater are. A computer controller adjusts a concentrated seawater electromagnetic valve according to a data signal given by a seawater concentration test sensor, and adjusts the outflow volume of the concentrated seawater to control the concentration of the concentrated seawater within a set value range; the reverse osmosis membrane core is vibrated, so that the impurities and salts are not easily attached to the reverse osmosis membrane core; fresh water in the closed fresh water area is pressurized periodically and instantaneously by compressed air, and fresh water penetrates through the reverse osmosis membrane core to flush the reverse osmosis membrane core, so that micropores of the micropore are maintained smoothly all the way.

Description

Technical field: [0001] The invention relates to a method for reverse osmosis seawater desalination and seawater concentration using the principles of concentration polarization and periodic instantaneous flushing. Background technique: [0002] At present, reverse osmosis seawater desalination is to use a pump to pressurize the pretreated seawater, so that the fresh water in the seawater with a certain pressure passes through the ultrafiltration membrane and polyamide resin reverse osmosis membrane or microporous ceramics to intercept impurities and salt. These trapped impurities and salts are first close to the ultrafiltration membrane and polyamide resin reverse osmosis membrane or microporous ceramics, and then adhere to the surface of ultrafiltration membrane and polyamide resin reverse osmosis membrane or microporous ceramics, preventing fresh water from passing through ultrafiltration. Membrane and polyamide resin reverse osmosis membrane or microporous ceramics; fina...

AI Technical Summary

Problems solved by technology

But it’s hard to get back. This treatment method can only clean out some impurities and salt, and still some impurities and salt can’t be cleaned out. Therefore, half of the micropores of the reverse osmosis membrane core that have been used for one year are severely blocked and cannot be repaired.

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