Water producing system

Abstract

Disclosed is a water producing system which produces fresh water by treating water to be treated (A) in a first semipermeable membrane treatment facility (2) and produces fresh water by mixing concentrated water generated in the treatment in the first semipermeable membrane treatment facility (2) into water to be treated (B) and treats mixed water thereof in a second semipermeable membrane treatment facility (3), the water producing system being characterized in that a bypass line for mixing the water to be treated (A) into the water to be treated (B) or the concentrated water without going through the first semipermeable membrane treatment facility (2) is provided so that the second semipermeable membrane treatment facility (3) can run even when the treatment cannot be performed, for example, due to the occurrence of a problem in the first semipermeable membrane treatment facility (2).

Description

technical field [0001] The invention relates to a water generation system using composite water treatment technology. In the system, treated water A and treated water B with different osmotic pressures are used as raw water, and fresh water is obtained through desalination technology. More specifically, it relates to an energy-saving and efficient fresh water production system applicable to the field of water purification treatment for water pipes, industrial water, food, medical process water, semiconductor-related cleaning water, and other industrial water manufacturing fields. Background technique [0002] In recent years, a large number of water-related technologies have been developed, and among them, the membrane separation method has been widely used in various fields because of its characteristics of energy saving, space saving, labor saving, and improvement of product quality. [0003] The separation membranes used in water treatment are roughly divided into two typ...

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Problems solved by technology

[0007] However, in the flow charts of the systems described in Non-Patent Document 1 and Non-Patent Document 2, there is only a liquid transport line from the sewage treatment line to the seawater desalination treatment line that transports the concentrated water treated by the RO membrane. pipeline

In the case of such a system, in the unlikely event that there is any problem with the RO membrane used in the system for producing fresh water from sewage, when the RO membrane cannot be treated, or it is shut down due to periodic inspection or cleaning with chemicals, from the system for producing fresh water from sewage to the The transportation of the system for producing fresh water from seawater cannot be carried out, and there is a problem that the advantages of the systems described in Non-Patent Document 1 and Non-Patent Document 2 are lost

In addition, in the case of sewage or industrial wastewater, etc., the flow rate to be treated changes in units of hours or days, but for the systems described in Non-Patent Document 1 and Non-Patent Document 2, when the amount of water obtained exceeds the amount that can be supplied to When the water volume of the RO membrane on the sewage treatment side is the sewage or industrial wastewater treatment water, it is unfavorable in terms of efficiency to discharge or dispose of the clear treated water that can be supplied to the RO membrane.

[0008] Furthermore, on the seawater desalination treatment pipeline side of the systems described in Non-Patent Document 1 and Non-Patent Document 2, since the seawater is directly supplied to the RO membrane without pretreatment, the organic matter and fine particles in the seawater are captured by the RO membrane. , it is easy to cause RO membrane clogging, and there is a problem that it cannot be used for a long time

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