Impurity acquisition system, water quality testing system, and liquid production and supply system

1 . An impurity acquisition system for acquiring impurities in a liquid to be tested, comprising:

an adsorbent that adsorbs impurities in the liquid to be tested; and

a first controller that switches at least one valve between the flow of the liquid to be tested into the adsorbent, a regeneration liquid into the adsorbent, and the flow of eluent into the adsorbent for eluting the impurities adsorbed on the adsorbent;

a flow rate acquisition unit that acquires a flow rate of fluid that has passed through the adsorbent from any of the liquid to be tested into the adsorbent, the regeneration liquid into the adsorbent, or the flow of the eluent into the adsorbent, wherein

the first controller controls the at least one valve to switch between the flow of liquid to be tested into the adsorbent and the flow of the eluent into the adsorbent based on the flow rate acquired by the flow rate acquisition unit;

wherein the first controller controls the at least one valve to execute:

a concentration process where the first controller controls the at least one valve to direct the liquid to be tested to pass through the adsorbent;

an elution process where the first controller controls the at least one valve to direct the eluent to pass through the adsorbent when the flow rate acquired by the flow rate acquisition unit indicates that an amount of the liquid to be tested directed to the adsorbent and passing through the adsorbent reaches a first threshold value;

a first cleaning process where the first controller controls the at least one valve to direct a cleaning liquid for cleaning the adsorbent to pass through the adsorbent when, in the elution process, the flow rate acquired by the flow rate acquisition unit indicates that an amount of the eluent directed to the adsorbent and passing through the absorbent reaches a second threshold value;

a regeneration process where the first controller controls the at least one valve to direct the regeneration liquid for regenerating the adsorbent to pass through the adsorbent when the flow rate acquired by flow rate acquisition unit indicates an amount of cleaning liquid directed to the adsorbent and passing through the absorbent has reached a third threshold value; and

a second cleaning process where the first controller controls the at least one valve to direct the cleaning liquid to pass through the adsorbent when, in the regeneration process, the flow rate acquired by the flow rate acquisition unit indicates that the regeneration liquid directed to the adsorbent and passing through the absorbent reaches a fourth threshold value.

2 . The impurity acquisition system according to claim 1 , further comprising:

an impurity removal unit that removes impurities from the cleaning liquid, wherein

the first controller causes the liquid that has passed through the impurity removal unit to be supplied to the adsorbent in the first and second cleaning processes.

3 . The impurity acquisition system according to claim 1 , wherein

a functional group of the adsorbent is a cation or anion exchange group or a chelate compound.

4 . A water quality testing system, comprising:

the impurity acquisition system according to claim 1 ; and

an information processing device that analyzes the concentration of impurities in liquid that has passed through the adsorbent from eluent directed to the absorbent and calculates the concentration of impurities in the liquid to be tested based on the concentration of impurities.

5 . A liquid production and supply system, comprising:

the water quality testing system according to claim 4 ;

a valve section that controls supply of the liquid to be tested from a liquid production and supply facility that performs at least one of the production and supply of the liquid to be tested to a point of use where the liquid to be tested is used; and

a second controller that controls the valve section based on the concentration of impurities calculated by the information processing device.

6 . The impurity acquisition system for acquiring impurities in a liquid to be tested according to claim 1 , comprising:

a plurality of adsorbents that are arranged in parallel with each other and that adsorb impurities in the liquid to be tested; and

a control device that switches the flow of the liquid to be tested to the plurality of adsorbents.