Full-automatic high-recovery-rate salt separation integrated system and method

Abstract

The invention provides a full-automatic high-recovery-rate salt separation integrated system and method. The method comprises a reverse osmosis membrane treatment process and a nanofiltration membrane process. A water feeding pump, a security filter, a high-pressure pump, an inter-segment booster pump, a reverse osmosis membrane device, a middle water tank, a low-pressure flushing pump, a cleaning device, a conductivity meter, a flow transmitter and the like are arranged in the reverse osmosis membrane treatment process. A water feeding pump, a security filter, a high-pressure pump, an inter-segment booster pump, a nanofiltration membrane device, a fresh water tank, a conductivity meter, a flow transmitter and the like are arranged in the nanofiltration membrane process. Firstly, it is guaranteed that the recovery rate of the system can reach the maximum, and the external displacement is small; secondly, the system has high separation efficiency on monovalent and divalent ions, and the final evaporative crystallization product has high purity and can reach the secondary standard of industrial salt; and finally, the system can realize automatic operation, and the personnel cost is reduced.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a fully automatic high-recovery salt separation integrated system, which is suitable for large, medium and small reclaimed water reuse and treatment projects, especially waste water zero-discharge engineering technology. Background technique [0002] For the membrane concentration process, there are currently several processes on the market, including reverse osmosis membrane, electrodialysis, forward osmosis, etc. The mechanism of the main desalination part of the reverse osmosis membrane is similar to the semi-permeable membrane, which can selectively permeate the ions in the water. In the natural state, the semi-permeable membrane (reverse osmosis membrane) selectively permeates the solvent (water) from the low concentration side The high-concentration side carries out natural osmosis, and a natural osmotic balance is reached under a certain osmotic pressure difference...

AI Technical Summary

Problems solved by technology

The core of electrodialysis (ED) technology is ion exchange membrane, the concentration limit can be increased to more than 20% of the salt content, but the water quality, investment and operation costs are high, especially when the salt content of the influent water is low, it is economical Poor performance, more suitable for use when the salt content is above 2%

Forward osmosis (FO) transfers the water in the high-salt waste to the draw solution to achieve concentrated water by setting a selective permeation membrane and a very high-concentration draw solution, but the selection of the draw solution and the later operating costs are relatively high

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