JP6184398B2 - Method for evaluating reformed water - Google Patents

Description

  The present invention relates to a method for evaluating modified treated water using anti-fluorite.

  Metal cutting is generally performed while supplying cutting oil to cool the cutting tool and reduce wear. These cutting oils include oil-based cutting oil and water-soluble cutting oil. However, in recent years, the use of water-soluble cutting oil, which has a high cooling capacity and has a low environmental load during disposal, has become the mainstream. This water-soluble cutting oil is basically prepared by dissolving an oil in water (cutting solvent water).

  Here, the inventors of the present application have found that the dispersibility of the oil changes depending on the cutting solvent water used, and that the difference in dispersibility of the oil affects the performance of the water-soluble cutting oil. And it was concerned in the invention described in the following [Patent Document 1] for obtaining cutting solvent water (water-soluble cutting oil) excellent in dispersibility of the oil agent. In the invention described in [Patent Document 1], an anti-fluorite unglazed product that is a kind of rhyolite or a fired product coated with an anti-fluorite glaze is used to modify the cutting solvent water to disperse the oil. To obtain a water-soluble cutting oil excellent in water resistance. And the modified treated water using this anti-fluorite is expected to be applied not only to cutting solvent water, but also to a variety of fields such as breeding water for ornamental fish and cultured fish, drinking water, warm bath water, various solvents, etc. ing.

JP 2011-174064 A

  By the technique described in [Patent Document 1], it has become possible to obtain modified treated water that is excellent in dispersibility of oils and the like and that is particularly suitable for cutting solvent water of water-soluble cutting oil. However, there is no evaluation method and evaluation index as to whether the obtained modified treated water has been appropriately treated and modified to a good level, and when the modified treated water is used as a water-soluble cutting oil, it is water soluble. Until the actual cutting oil was actually prepared, the quality of the modified treated water could not be judged.

  This invention is made | formed in view of the said situation, and it aims at providing the evaluation method of the reforming process water which judges whether the reforming process water is reforming to a favorable level.

The present invention
(1) A method for evaluating reformed water that has been subjected to a reforming process for passing water between the anti-fluorite stones 12;
Collecting a predetermined amount of raw water before the reforming treatment as comparative water;
Collecting a predetermined amount of the reformed treated water subjected to the reforming treatment as test water;
Adding a predetermined amount of an aqueous dispersion of spherical polystyrene latex particles as a particle size standard solution having a predetermined particle size to the comparative water and the test water, and preparing a measurement sample;
Obtaining a median value of the particle size distribution of the spherical polystyrene latex particles of the measurement sample;
Comparing the median of the comparative water and the median of the test water;
Determining the reformed water as non-defective when the median test water is less than 50% of the median of the comparative water;
The above-described problems are solved by providing a method for evaluating reformed treated water, which is characterized by comprising:
(2) A first modification process for passing water between the anti-fluorite stones 12, a second modification process for passing water between the anti-fire stone fired body beads 22 fired by applying a glaze to the surface, and an anti-baking resistance The first reforming treatment was performed on the highly-modified water that was subjected to the third reforming treatment in which water was passed between the silver-coated antifluorite beads 32 in which the surface of the pyrolite beads was covered with a silver layer. A method for evaluating reformed treated water obtained by mixing first modified treated water,
A predetermined amount of raw water before the first reforming treatment is collected as a first comparison water, and the first reforming treatment water after the first reforming treatment is used as a second comparison water. Collecting a predetermined amount;
Collecting a predetermined amount of modified treated water obtained by mixing the highly modified treated water and the first modified treated water at a predetermined ratio as test water;
A step of preparing a measurement sample by adding a predetermined amount of an aqueous dispersion of true spherical polystyrene latex particles as a particle size standard solution having a predetermined particle size to the first comparison water, the second comparison water, and the test water. When,
Obtaining a median value of the particle size distribution of the spherical polystyrene latex particles of the measurement sample;
Comparing the median of the measurement sample;
Mixed when the median value of the second comparison water was less than 50% of the median value of the first comparison water and the median value of the test water was smaller than the median value of the second comparison water Determining the modified treated water as non-defective product;
The above-described problems are solved by providing a method for evaluating reformed treated water, which is characterized by comprising:
(3) measuring the zeta potential of the measurement sample;
Comparing the zeta potential of the comparative water with the zeta potential of the test water;
(1) or (2), further comprising the step of determining that the treated water is non-defective when the absolute value of the zeta potential of the test water is larger than the absolute value of the zeta potential of the comparative water. The above-described problems are solved by providing the method for evaluating reformed treated water described in (1).
(4) measuring the transmissivity of the measurement sample;
Comparing the transmittance of the comparative water with the transmittance of the test water;
Any one of the above (1) to (3), further comprising the step of judging the modified treated water as a non-defective product when the light transmittance of the test water is larger than the light transmittance of the comparative water. The said subject is solved by providing the evaluation method of the reforming process water as described in above.

  According to the method for evaluating reformed water according to the present invention, the quality of the reformed water can be determined after the reforming process.

It is a figure which shows the manufacturing apparatus of reforming process water. It is a graph which shows the dispersibility of reforming process water. It is a graph which shows the effect of reforming treatment water. It is a flowchart of the evaluation method of the reforming process water which concerns on this invention. It is a flowchart of the evaluation method of the reforming process water which concerns on this invention. It is a graph which shows the evaluation result by the evaluation method of the modification process water which concerns on this invention.

  First, the first reforming process, the second reforming process, and the third reforming process, which are methods for producing the reforming process water to which the present invention is applied, will be described. Here, Fig.1 (a) is a figure which shows the modification | reformation processing apparatus 10 which performs a 1st modification process with respect to raw | natural waters, such as a tap water. The reforming treatment apparatus 10 is filled with an anti-fluorite 12 crushed to an appropriate size inside, and a water supply pipe 10 a that supplies raw water to the reforming treatment apparatus 10 and water passing through the reforming treatment apparatus 10. And a water discharge pipe 10b for discharging the modified treated water. Here, anti-fluorite is a kind of rhyolite produced in the Izu peninsula, etc. The composition is mainly volcanic glass, containing quartz, feldspar, mica and other components, and the main component silicic acid (silica) ) Is a porous spongy igneous rock that crosses vertically and horizontally and is made into glass fiber.

  Next, the operation of the reforming apparatus 10 will be described. First, raw water such as tap water is supplied to the water supply pipe 10a at a predetermined flow rate. As a result, raw water is supplied into the reforming apparatus 10 from the water supply pipe 10a. The supplied raw water passes through the anti-fluorite 12 and is discharged from the water discharge pipe 10b. Further, the discharged water can be supplied to the supply pipe 10a. At this time, the anti-fluorite component acts on the raw water, and the first reforming process is performed on the raw water. The modified treated water thus obtained is used for various applications such as a cutting solvent water for water-soluble cutting oil. Further, it is supplied to an advanced reforming processing apparatus 50 shown below and subjected to further reforming processing.

  Next, the second and third reforming treatment water to which the present invention is applied will be described. FIG. 1B is a diagram showing an advanced reforming apparatus 50 that performs a second reforming process and a third reforming process on the first reforming process water subjected to the first reforming process. It is. The advanced reforming apparatus 50 includes a second reforming portion 20 filled with anti-fluorite fired body beads 22 baked by applying glaze on the surface, and a silver layer covering the surface of the unglazed anti-fluorite beads with a silver layer. The third reformer 30 filled with the coated anti-fluorite beads 32, the tank 40 for storing the reformed water, and the second reformer 20 and the third reformer 30 for the reformed water in the tank 40. And a pump 42 that circulates between the two. Further, the advanced reforming apparatus 50 includes a water supply port 50a that supplies the first reformed treated water to the tank 40, a connection pipe 50b that connects the tank 40 and the second reforming unit 20, and a second modified The connecting pipe 50c that connects the mass part 20 and the third reforming part 30, the connecting pipe 50d that connects the third reforming part 30 and the tank 40, and the discharge that discharges highly reformed treated water stored in the tank 40. And a water outlet 50e.

  Here, the anti-fluorite fired body beads 22 filled in the second modified portion 20 contain 30 wt% or more of a relatively coarse anti-fluorite powder having a particle size of about 50 μm to 550 μm, and are formed into a substantially spherical shape using clay as a binder. Thereafter, firing is performed at a temperature of 1000 ° C. to 1500 ° C. to produce unglazed beads, a glaze is applied to the surface of the unglazed beads, and the firing is performed at a temperature of 1000 ° C. to 1500 ° C. In addition, as a glaze used at this time, it is preferable to use what mixed said anti-fluorite powder 97 wt% and synthetic paste 3 wt% with a suitable quantity of water. The silver-coated anti-fluorite beads 32 to be filled in the third modified portion 30 are produced by, for example, forming a silver thin film on the surface of an unglazed bead produced by the same method as described above by a well-known method. It is.

  Next, the operation of the advanced reforming apparatus 50 will be described. First, first reforming water is prepared by the reforming apparatus 10. Next, a predetermined amount of the first reformed water is supplied into the tank 40 of the advanced reformer 50 through the water supply port 50a. Next, the pump 42 is driven. Thus, the first reformed water in the tank 40 is supplied to the second reforming unit 20 through the connection pipe 50b. As a result, the first reforming water passes through the second reforming unit 20. At this time, the anti-fluorite component of the anti-fluorite fired body beads 22 acts on the first modified water, and further modification processing (second modification processing) is performed on the first modified water. Is done. The second reformed water subjected to the second reforming process is supplied to the third reforming unit 30 through the connection pipe 50c. As a result, the second reformed water passes through the third reforming unit 30. At this time, the anti-fluorite component and the silver component of the silver-coated anti-fluorite beads 32 act on the second modified water, so that the second modified water (third modified treatment) is further modified. ) Is given. The highly reformed treated water subjected to the third reforming treatment is discharged into the tank 40 through the connecting pipe 50d, and is supplied again to the second reforming unit 20 and circulates in the highly reforming treatment apparatus 50. Further, a reforming process is performed. Moreover, the highly modified treated water stored in the tank 40 is taken from the water outlet 50e as appropriate. Then, the first modified water produced separately is mixed with the taken advanced modified water at a predetermined ratio. The modified treated water thus obtained is used for various applications in addition to being used as a cutting solvent water for water-soluble cutting oil. Although it is possible to use the highly reformed treated water as it is, the highly reformed treated water is expensive and expensive to manufacture, so it is diluted with the first modified treated water as described above. It is practically preferable. The advanced reforming apparatus 50 is preferably a circulation type as described above, but the water supply port (water supply pipe) 50a is connected to the second reforming unit 20 via the pump 42 without using the tank 40. At the same time, a water outlet (water discharge pipe) 50e may be connected to the third reforming unit 30 to form a pass-through type advanced reforming apparatus 50.

  And when using these modified process water as cutting solvent water, a well-known oil agent and a solvent are mixed and water-soluble cutting oil is produced. The produced water-soluble cutting oil is stored in a cutting oil tank or the like, and the cutting machine performs cutting while supplying and circulating water-soluble cutting oil from the cutting oil tank to the processing unit.

  Here, the graph of the average particle diameter of the oil agent (emulsion) in the water-soluble cutting oil when tap water and the modified treated water are used as the cutting solvent water is shown in FIG. Note that B in FIG. 2 is the average particle diameter of the oil component in the water-soluble cutting oil prepared by mixing raw water (tap water) with cutting solvent water and 5 vol% of the oil, and A is the first modification treatment. The average particle size of the oil component in the water-soluble cutting oil prepared by mixing 5 vol% of the oil with water as the cutting solvent water, and A ′ is 90 vol% of the first modified treated water and the highly modified treated water. The average particle size of the oil component in the water-soluble cutting oil prepared by mixing 5 vol% and 5 vol% of the oil, A ″ is 85 vol% of the first modified treated water, and 10 vol% of the highly modified treated water. The average particle diameter of the oil component in the water-soluble cutting oil prepared by mixing 5 vol% of the oil agent.

  From FIG. 2, the average particle size of the oil component of water-soluble cutting oil B using tap water as cutting solvent water was 196.4 nm, whereas water-soluble cutting using modified treated water as cutting solvent water. The average particle diameters of the oil agent components of oils A, A ′, and A ″ were 82.9 nm, 63.2 nm, and 45.9 nm, respectively, which were lower than those using tap water as the cutting solvent water. From this, it can be seen that by using the modified treated water as the cutting solvent water, the dispersibility of the oil component is improved and the average particle size shows a small value. Further, the average particle diameter of the oil component decreases as the ratio of the advanced reforming treatment water increases, and it can be seen that the second and third reforming treatments further improve the dispersibility of the reforming treatment water. . The mixing ratio of the first reformed treated water and the advanced reformed treated water is not limited to the above example, and an appropriate ratio is appropriately selected depending on the use, cost, and the like.

  Next, FIG. 3A shows a graph of the number of cuts and roundness when circular cutting is performed using the water-soluble cutting oil B and the water-soluble cutting oil A described above. Moreover, the graph of the temperature rise of the work material at this time is shown in FIG.3 (b). From FIG. 3 (a), the water-soluble cutting oil B using tap water has 13 cuts and the roundness exceeds 1.8 μm, whereas the water-soluble cutting using the first modified water is used. With oil A, the roundness does not exceed 1.8 μm up to 40 cuttings, and it can be seen that the use of the modified treated water suppresses the wear of the cutting tool and continues the machining accuracy for a long period of time. Further, from FIG. 3 (b), the water-soluble cutting oil B using tap water had a temperature rise of about 3 ° C., whereas the water-soluble cutting using the first modified water was used. With oil A, the temperature rise of the work material is about 1.2 ° C., and it can be seen that the use of the modified treated water suppresses the temperature rise during cutting. From these facts, it is understood that the ability of the water-soluble cutting oil is improved by using the modified treated water as the cutting solvent water.

  Next, the method for evaluating reformed water according to the present invention will be described with reference to the flowcharts of FIGS. Hereinafter, the reformed water obtained by mixing the highly reformed water and the first reformed water is referred to as a mixed reformed water for convenience. Here, FIG. 4 is a method for evaluating the first reformed water that has undergone only the first reforming process, and FIG. 5 is a mixture in which the highly reformed water and the first reformed water are mixed. This is a method for evaluating reformed water. First, in the method for evaluating reformed water that has undergone only the first reforming process, a predetermined amount of raw water before the first reforming process is collected in advance as comparative water (comparative water sampling step S100). Next, a first reforming process is performed on the raw water (step S002). Next, a predetermined amount of the first modified treated water subjected to the first modified treatment is collected as test water (test water collection step S104).

  Next, a predetermined amount (5 vol%) of an aqueous dispersion of spherical polystyrene latex particles as a particle size standard solution having a predetermined particle size is added to the collected comparative water and test water, and stirred to prepare a measurement sample. (Measurement sample preparation step S202). Here, the particle size standard solution is a commercially available standard solution used for calibration of a particle size measuring machine. Here, an example in which a 112 nm particle size standard solution is used as the particle size standard solution will be described. However, the particle size standard solution is not particularly limited as long as it is a particle size standard solution of the order of 100 nm. A standard solution may be used.

  Next, the particle size distribution of the particle size standard solution particles dispersed in these measurement samples is measured using a known particle size distribution meter. And the median value of the obtained particle size distribution is acquired (measurement step S204). Next, the median values of the particle size distributions of the obtained measurement samples are compared (comparison step S206). Then, when the median value of the test water is less than 50% of the median value of the comparative water, the reformed water is determined to be non-defective (determination step S208).

  Further, in the evaluation method of the mixed reforming treated water, first, as in the comparative water sampling step S100 described above, a predetermined amount of raw water before the first reforming process is collected as the first comparative water (first first). Comparative water collection step S100). Next, a first reforming process is performed on the raw water (step S002). Next, a predetermined amount of the first reformed water that has undergone the first reforming process is collected as second comparative water (second comparative water sampling step S102). Next, the second and third reforming processes are performed on the first reforming process water (step S004). Next, the advanced reforming water obtained by the second and third reforming treatments and the separately prepared first reforming water are mixed at a predetermined ratio (step S006). Next, a predetermined amount of this mixed reforming treated water is collected as test water (test water collection step S104).

  Next, a predetermined amount (5 vol%) of the above particle size standard solution is added to the collected first comparison water, second comparison water, and test water and stirred to prepare a measurement sample (measurement sample preparation step S202). ). Next, the particle size distribution of the particle size standard solution particles dispersed in these measurement samples is measured using a known particle size distribution meter. And the median value of the obtained particle size distribution is acquired (measurement step S204).

  Next, the median value of the particle size distribution of the first comparison water (raw water) is compared with the median value of the particle size distribution of the second comparison water (first reformed water) (first comparison step S206). ). Then, it is confirmed that the median value of the second comparison water is less than 50% of the median value of the first comparison water, and that the first reforming treated water is appropriately reformed (first determination) Step S208).

  Next, the median value of the particle size distribution of the second comparison water is compared with the median value of the particle size distribution of the test water (second comparison step S306). Then, when the median value of the test water is smaller than the median value of the second comparison water, the mixed reforming treated water is judged as a non-defective product (second judgment step S308).

  Here, FIG. 6A shows the respective measurement samples of the first comparative water B (tap water), the second comparative water A (first modified treated water), and the mixed modified treated water A ′ ″. The median particle size distribution is shown. The particle size distribution was measured by a dynamic light scattering method using ESL Z-1000 manufactured by Otsuka Electronics Co., Ltd. In addition, the measurement sample of the mixed modified treated water A "" used was a mixture of 87 vol% of the first modified treated water, 3 vol% of the highly modified treated water, and 5 vol% of the particle size standard solution.

  From FIG. 6A, the median value of the first comparative water B (tap water) was 310.4 nm, whereas the median value of the second comparative water A (first reformed water) was It is 126.2 nm, and it can be seen that it is less than half of the first comparative water B (tap water). In addition, when a 112 nm particle size standard solution is dispersed in an ideal state in a solvent, the average particle size and the median value are 112 nm. However, in reality, the spherical polystyrene latex particles of the particle size standard solution aggregate in the solvent, and the particle size apparently shows a large value. And as this aggregation is stronger, both the average particle diameter and the median value are larger. However, the difference in average particle size is small and is not suitable as an evaluation index. Therefore, in the present invention, the median value of the particle size distribution is used as an index of dispersibility for the evaluation of the reformed water. Water-soluble cutting oil using modified treated water whose median value has been reduced to less than half of the raw water is recognized to improve lubricity and cooling capacity, and those whose median value does not reach half have insufficient improvement effect. Met.

  Therefore, in the evaluation method of the first reforming treatment water, the median value of the particle size distribution (of the standard particle size solution) of the comparative water before the first reforming treatment and the first reforming treatment were performed. Compare the median of the particle size distribution (of the particle size standard solution) of the test water, and when the median value of the test water shows half of the median value of the comparative water, that is, less than 50%, the first modification Judge treated water as good.

  Further, the median value of the mixed reforming treated water A "" was 119.4 nm, which was a lower value than the second comparative water A that is the first reforming treated water. This is because the advanced reforming water subjected to the second and third reforming treatments is mixed with the first reforming treatment water, so that the reforming level of the treatment water is higher than that of the first reforming treatment water. Means to improve.

  Therefore, in the mixed reforming treatment water evaluation method, after performing the first comparison step S206 and the first determination step S208 described above, the center of the particle size distribution (of the particle size standard solution) of the second comparison water is obtained. The value is compared with the median value of the particle size distribution (of the particle size standard solution) of the test water (second comparison step S306). Then, when the median value of the second comparison water is smaller than the median value of the test water, the mixed reforming treated water is judged as a non-defective product (second judgment step S308).

  In addition, although the example which evaluates 1st comparison water, 2nd comparison water, and test water simultaneously is demonstrated here, 1st comparison water and 2nd comparison water are evaluated beforehand, and 1st comparison water is evaluated. After confirming that the reforming process is properly performed, the second and third reforming processes are performed, and the quality of the mixed reforming process water is determined by evaluating the second comparison water and the test water. May be.

  Furthermore, in the evaluation method for the modified treated water according to the present invention, in addition to the particle size distribution of the measured sample, the zeta potential and the light transmittance of each measured sample are measured, and the quality of the modified treated water is judged by combining these results. You can go.

  Here, FIG. 6B and FIG. 6C show the zeta potential of each measurement sample. FIG. 6D shows the transmissivity of each measurement sample. The zeta potential was measured by electroosmosis using ESL Z-1000 manufactured by Otsuka Electronics Co., Ltd. Moreover, the measurement of the transmissivity measured the translucency of the light of a wavelength of 715 nm using ASD11D by ASONE CORPORATION. In addition, the light transmittance was shown by the ratio which made the light transmittance of ion-exchange water 100%.

  From FIG. 6B, the absolute value of the zeta potential of the first comparative water B (tap water) is 7.17 mV (measured value−7.17 mV), and the second comparative water A (first reformed water) The absolute value of the zeta potential of the treated water) is 12.82 mV (measured value minus 12.82 mV), and the absolute value of the zeta potential of the highly modified treated water C is 19.21 mV (measured value minus 19.21 mV). It can be seen that a larger value is exhibited as the reforming treatment is performed. Further, from FIG. 6C, the absolute value of the zeta potential of the second comparative water A (first reformed treated water) is 16.20 mV (measured value −16.20 mV), and the mixed reformed treated water The absolute value of the zeta potential of A ′ ″ is 29.24 mV (measured value −29.24 mV). By mixing the highly reformed treated water with the first reformed treated water, the absolute value of the zeta potential is It can be seen that the value is larger than that of the first reforming treated water. The reason why the value of the second comparison water A in FIGS. 6B and 6C is different is that the raw water, the reforming date, the measurement date, etc. are different.

  Therefore, the absolute value of the zeta potential is evaluated in the comparison step and the determination step (steps S206, S306, S208, and S308), and the median value of the particle size distribution satisfies the above-mentioned conditions before and after the reforming process, and the absolute value of the zeta potential is When the value increases, the reformed water may be judged as a non-defective product.

  Moreover, from FIG.6 (d), the transmittance | permeability of 1st comparison water B (tap water) is 99.2% of ion-exchange water, and 2nd comparison water A (1st reforming treated water). The ion exchange water ratio is 100.2%, and it can be seen that the transparency is increased by the modification treatment. Further, the light transmittance of the mixed reforming treated water A ″ ′ is 101.7% as compared with the ion-exchanged water, which indicates that the transparency is higher than that of the second comparative water A (first reforming treated water). . These things are considered to be due to the improvement of the dispersibility of the reformed water by the reforming treatment and the reduction of aggregates.

  Therefore, the transmittance is evaluated in the comparison step and the determination step (steps S206, S306, S208, and S308), and the median value of the particle size distribution satisfies the above-described conditions before and after the reforming process, and the transmittance is increased. Sometimes, the reformed water may be judged as a good product. Further, in the comparison step and the determination step, all of the median value of the particle size distribution, the absolute value of the zeta potential, and the light transmittance may be used as evaluation indexes.

  As described above, the method for evaluating the modified treated water according to the present invention adds the particle size standard solution to the produced modified treated water, and determines the dispersibility of the spherical polystyrene latex particles in the particle size standard solution. The quality of the reformed water is determined by evaluating. As a result, it is possible to immediately determine whether or not the quality of the reformed water has been unknown until the actual use.

  In addition, the evaluation method of the reforming process water shown by this example is an example, and the evaluation procedure, the evaluation apparatus, the addition amount of a particle size standard solution, etc. are not limited to said example. In addition, the present invention can be modified and implemented without departing from the gist of the present invention.

10 Modification processing equipment
12 Firestone
20 Second reforming section
22 Firestone fired beads
30 Third reforming section
32 Silver coated anti-fluorite beads
40 tanks
42 Pump
50 Advanced reformer

Claims (4)

It is a method for evaluating modified treated water that has undergone a modification treatment for passing water between anti-fluorite,
Collecting a predetermined amount of raw water before the reforming treatment as comparative water;
Collecting a predetermined amount of the reformed treated water subjected to the reforming treatment as test water;
Adding a predetermined amount of an aqueous dispersion of spherical polystyrene latex particles as a particle size standard solution having a predetermined particle size to the comparative water and the test water, and preparing a measurement sample;
Obtaining a median value of the particle size distribution of the spherical polystyrene latex particles of the measurement sample;
Comparing the median of the comparative water and the median of the test water;
Determining the reformed water as non-defective when the median test water is less than 50% of the median of the comparative water;
A method for evaluating reformed water characterized by comprising: The first modification treatment that allows water to flow between the anti-fluorite, the second modification treatment that allows water to flow between the beads of the fired firestone fired by applying a glaze on the surface, and the surface of the unfired anti-fluorite beads. A first reforming process in which the first reforming process is performed on the highly reformed water that has been subjected to the third reforming process that passes between the silver-coated anti-fluorite beads covered with the silver layer. A method for evaluating reformed treated water mixed with water,
A predetermined amount of raw water before the first reforming treatment is collected as a first comparison water, and the first reforming treatment water after the first reforming treatment is used as a second comparison water. Collecting a predetermined amount;
Collecting a predetermined amount of modified treated water obtained by mixing the highly modified treated water and the first modified treated water at a predetermined ratio as test water;
A step of preparing a measurement sample by adding a predetermined amount of an aqueous dispersion of true spherical polystyrene latex particles as a particle size standard solution having a predetermined particle size to the first comparison water, the second comparison water, and the test water. When,
Obtaining a median value of the particle size distribution of the spherical polystyrene latex particles of the measurement sample;
Comparing the median of the measurement sample;
Mixed when the median value of the second comparison water was less than 50% of the median value of the first comparison water and the median value of the test water was smaller than the median value of the second comparison water Determining the modified treated water as non-defective product;
A method for evaluating reformed water characterized by comprising: Measuring the zeta potential of the measurement sample;
Comparing the zeta potential of the comparative water with the zeta potential of the test water;
The method further comprises the step of determining the reformed water as a non-defective product when the absolute value of the zeta potential of the test water is larger than the absolute value of the zeta potential of the comparative water. The evaluation method of the reforming treated water as described in 1. Measuring the transmissivity of the measurement sample;
Comparing the transmittance of the comparative water with the transmittance of the test water;
The method further comprises the step of determining the modified treated water as a non-defective product when the light transmittance of the test water is larger than the light transmittance of the comparative water. The evaluation method of the modified treated water as described.