Water purification device and running method thereof

Abstract

The invention belongs to the field of water purifiers. The water purification device comprises a semipermeable membrane supply pipeline 2, a semipermeable membrane element system 1 comprising two or more semipermeable membrane elements formed by rolling a water inlet grid, a water production grid and a separation membrane, a produced water supply pipeline 4, a concentrated water supply pipeline 3and a control device 15. According to the invention, part of the semi-permeable membrane elements in the water purification device are formed by adopting a membrane surface at a high flow rate, so that the flushing / replacing / filtering step can be carried out when the water purification device is shut down and restarted after shutdown so as to ensure the water yield recovery and the stable operation of the water purification device under the high recovery rate and save water and energy, and the TDS value of the water produced by the semipermeable membrane after shutdown and restart can be effectively reduced so as to ensure the water quality safety.

Description

technical field [0001] The invention relates to the field of water purifiers, in particular to a water purifier capable of purifying tap water, surface water, underground water, etc., and an operating method of the water purifier. Background technique [0002] In order to remove impurities and microorganisms contained in tap water, surface water, ground water, etc., so as to obtain clean drinking water and pure water directly used as domestic water, the separation membrane, especially the semi-permeable membrane, such as nanofiltration (NF ) membrane or reverse osmosis (RO) membrane water purifiers are widely used. [0003] NF membranes and RO membranes have the ability to reduce the concentration of solutes contained in water to be treated to below the concentration that can be used as regenerated water. Specifically, NF membranes and RO membranes contain salt and minerals, such as divalent ions such as magnesium ions, calcium ions, and sulfate ions, monovalent ions such a...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the water flow rate of the semi-permeable membrane decreases with the increase of the operating time and the quality of the produced water deteriorates when the semi-permeable membrane is shut down and restarted, a semi-permeable membrane water purification device and an operation method for the water purification device are provided. Through the semi-permeable membrane The composition of the element system and the composition of the semi-permeable membrane elements can effectively reduce the attenuation of permeate during operation, and improve the stability of operation under the premise of high recovery rate. At the same time, the flushing / replacement operation when the operation is stopped and restarted can further reduce membrane surface pollution. , prolong the service life of the semi-permeable membrane, and because the concentration of the solution on the surface of the membrane decreases, the concentration difference between the supply side and the produced water side decreases, which can effectively suppress the increase in the TDS of the produced water when the shutdown is restarted, and improve the overall water quality safety

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