JP4683977B2 - Hydrogen peroxide injection control method and apparatus in accelerated oxidation water treatment method - Google Patents

Description

  The present invention relates to a hydrogen peroxide injection control method and apparatus in an accelerated oxidized water treatment method in which ozone and hydrogen peroxide are used in combination to oxidize and decompose hardly decomposed substances in water.

  Ozone has a strong oxidizing power, and water treatment that performs sterilization, decolorization, deodorization, oxidation removal of organic substances or inorganic substances by diffusing ozone gas into water is widely performed. In particular, in the suburbs of urban areas, the damage of off-flavors caused by the water intake is spreading, and the strong oxidizing power of ozone described above exerts a great effect on the removal of off-flavors. The introduction of advanced processing using is being promoted.

  In recent years, an accelerated oxidation method with higher oxidizing power has been used particularly for the purpose of decomposing a hardly decomposable substance. The accelerated oxidation method is a combination of ozone, ultraviolet irradiation, hydrogen peroxide addition, etc., which promotes the self-decomposition of ozone and promotes the generation of hydroxy radicals (OH radicals) generated at that time. This is a technique for increasing the oxidizing power and efficiently decomposing substances that are difficult to decompose with ozone alone.

  In the accelerated oxidation treatment using ozone and hydrogen peroxide, when the hydrogen peroxide injection rate is higher than the ozone injection rate, the dissolved ozone concentration is not detected, and it is considered that the dissolved ozone feedback control so far becomes difficult. In order to solve this problem, as a method for controlling the injection amount of ozone and hydrogen peroxide, the amount of ozone added to the treated water and the dissolved ozone concentration in the treated water are in a linear relationship, and the pollutant concentration is a parameter. As for the treated water to be treated in advance, a linear relationship between the amount of ozone to be added and the dissolved ozone concentration is obtained from experiments, experiences, etc., and an appropriate amount of ozone is applied to the treated water. Adding and measuring dissolved ozone, setting and controlling the target value of ozone addition amount is performed. And there exists the method of controlling the addition amount of hydrogen peroxide based on the measured value of dissolved ozone concentration, or the amount of ozone addition (refer patent document 1).

  In addition, it is preferable to control the hydrogen peroxide injection amount as a predetermined ratio (for example, molar ratio) of hydrogen peroxide and ozone, and this ratio suppresses the formation of bromate ions (carcinogenic substances). It is preferable to select an appropriate value depending on the quality of the water to be treated so that it can be used.

Further, commercially available hydrogen peroxide has a high concentration for use in clean water. For example, the concentration of hydrogen peroxide in hydrogen peroxide is about 4 × 10 ⁸ mg / L. In fact, the injection amount of hydrogen peroxide used in clean water in the above control method is about 20 mg / L or less, and once diluted with hydrogen peroxide so that it can be operated within the injection flow rate range of the chemical injection pump, It is preferable to inject hydrogen oxide water after making it. However, the ozone injection rate of the above control method varies greatly from 0.3 mg / L to 3 mg / L depending on the ozone consuming substance in the water to be treated, and the injection amount of the hydrogen peroxide solution varies greatly accordingly.

  By the way, the flow rate range of the chemical injection pump is limited for the following reasons. If the hydrogen peroxide concentration is kept constant, there is a problem that a necessary amount of hydrogen peroxide cannot be injected. FIG. 9 is a diagram showing the relationship between the number of strokes per unit time (spm) and the flow rate (mL / min) of the chemical injection pump. According to FIG. 9, the flow rate is at most 20 mL / min. If the pump flow rate is increased by increasing the flow rate gradient or the number of strokes, the hydrogen peroxide solution will be decomposed by combining with oxygen, making it impossible to control the flow rate accurately. Fine flow control becomes difficult. Therefore, when the ozone injection rate is increased due to the water quality as described above, there is a problem that the supply of hydrogen peroxide water is insufficient.

Further, as in the invention described in Patent Document 1, the dissolved ozone concentration value at the outlet of the preceding ozone treatment tank is measured, and based on this measured value, the amount of ozone injected into the subsequent accelerated oxidation treatment tank, and When controlling the hydrogen peroxide injection amount, the water in the ozone treatment tank to be measured is immediately introduced into the accelerated oxidation treatment tank (simultaneously with the measurement), so the quality of the water to be treated fluctuated rapidly. In this case, there is a problem that the amount of hydrogen peroxide injected into the accelerated oxidation treatment tank cannot be changed at an appropriate timing, that is, the control is delayed.
JP 2001-984 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide an appropriate amount of hydrogen peroxide at an appropriate timing even if the ozone injection amount varies greatly depending on the quality of the water to be treated. It is an object of the present invention to provide a hydrogen peroxide injection control method and apparatus in an accelerated oxidized water treatment method capable of controlling the injection of water.

  In order to solve the above-mentioned problems, the present invention performs ozone treatment on water to be treated by contacting and mixing with ozone gas in an ozone contact tank, and then mixing ozone gas and hydrogen peroxide in an accelerated oxidation treatment tank. In the hydrogen peroxide injection control method in the accelerated oxidation water treatment method in which the accelerated oxidation treatment is performed by injection, the injection amount of hydrogen peroxide in the accelerated oxidation treatment step is predetermined with respect to the ozone injection amount in the accelerated oxidation treatment step. In addition, hydrogen peroxide is injected with hydrogen peroxide diluted with water. At that time, measure the total organic carbon (TOC) of the water to be treated and / or ultraviolet absorbance. Based on this measurement value, the required injection amount of hydrogen peroxide water is predicted, and the dilution ratio of the hydrogen peroxide with water is changed at least once based on the prediction. The change is that when the measured value of the TOC or UV absorbance is large (or small), the dilution factor is small (or large), and the ozone injection amount in the accelerated oxidation treatment step is set in advance. The amount added in the accelerated oxidation treatment step is controlled on the basis of the diluted concentration of the hydrogen peroxide solution so that the amount of hydrogen peroxide injected at a predetermined ratio is obtained (claim 1).

  The above-mentioned problem can also be solved by the invention of claim 2 below. In other words, the water to be treated is subjected to ozone treatment by contacting and mixing with ozone gas in an ozone contact tank, and then subjected to accelerated oxidation treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation treatment tank. In the hydrogen peroxide injection control method in the water treatment method, the relationship between the total organic carbon (TOC) value in the water to be treated and / or the ozone injection amount in the accelerated oxidation treatment step with respect to the ultraviolet absorbance value is determined in advance. And measuring the total organic carbon (TOC) of the water to be treated or the ultraviolet absorbance, and the ozone injection amount in the accelerated oxidation treatment step based on the relationship between the measured value and the predetermined ozone injection amount. The hydrogen peroxide injection amount in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. The injection of hydrogen peroxide is performed with hydrogen peroxide solution obtained by diluting hydrogen peroxide with water, and at this time, the dilution ratio of the hydrogen peroxide with water is changed at least once, Alternatively, when the measurement value of the ultraviolet absorbance is large (or small), the dilution rate is small (or large), and the hydrogen peroxide injection amount is set to a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. Thus, the amount added in the accelerated oxidation treatment step is controlled based on the diluted concentration of the hydrogen peroxide solution (Claim 2).

  As an embodiment of the first or second aspect, the inventions of the following third to fourth aspects are preferable. That is, in the hydrogen peroxide injection control method according to claim 1 or 2, the water for diluting the hydrogen peroxide is highly treated water treated by the accelerated oxidation water treatment method, membrane filtered water or tap water. Dechlorinated water or ion-exchanged water that has been dechlorinated is used (claim 3).

  Further, in the hydrogen peroxide injection control method according to claim 1 or 2, at least one change in dilution ratio of the hydrogen peroxide with water is for addition diluted to at least two different concentrations with different dilution ratios. Either one is selected from the hydrogen peroxide solution storage tank, and the hydrogen peroxide solution is injected from the selected hydrogen peroxide solution storage tank for addition into the accelerated oxidation treatment tank (claim 4).

  Further, the above problem can be solved by the invention of claim 5 or 6 below. In other words, the water to be treated is subjected to ozone treatment by contacting and mixing with ozone gas in an ozone contact tank, and then subjected to accelerated oxidation treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation treatment tank. In the hydrogen peroxide injection control method in the water treatment method, the hydrogen peroxide injection amount in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step, and hydrogen peroxide injection is performed. Is performed with hydrogen peroxide solution obtained by diluting hydrogen peroxide with water at a predetermined magnification, and the amount of the hydrogen peroxide solution added to the accelerated oxidation treatment step is controlled by the flow rates of a plurality of flow rate variable pumps, At that time, measure the total organic carbon (TOC) of the water to be treated and / or the ultraviolet absorbance, and based on this measurement value, estimate the required injection amount of the hydrogen peroxide solution. Based on the prediction, the increase / decrease is determined by determining the movable number of the plurality of flow rate variable pumps, and the hydrogen peroxide injection amount in a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. As described above, the flow control of the plurality of variable flow pumps is performed (Claim 5).

  In addition, the water to be treated is contacted and mixed with ozone gas in an ozone contact tank, and then subjected to ozone treatment. Then, in the accelerated oxidation treatment tank, ozone gas and hydrogen peroxide are mixed and injected to perform accelerated oxidation treatment. In the hydrogen peroxide injection control method in the water treatment method, the relationship between the total organic carbon (TOC) value in the water to be treated and / or the ozone injection amount in the accelerated oxidation treatment step with respect to the ultraviolet absorbance value is determined in advance. And measuring the total organic carbon (TOC) of the water to be treated or the ultraviolet absorbance, and the ozone injection amount in the accelerated oxidation treatment step based on the relationship between the measured value and the predetermined ozone injection amount. The hydrogen peroxide injection amount in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. And the injection of hydrogen peroxide, and performing a hydrogen peroxide solution diluted with water to hydrogen peroxide at a predetermined magnification by the flow rate control of the plurality of variable flow rate pump (claim 6).

  According to the first to sixth aspects of the invention, unlike the invention of Patent Document 1, the total organic carbon (TOC) or ultraviolet absorbance of the water to be treated is measured, and the TOC or purple is measured based on the measured value. Since the injection amount of the hydrogen peroxide solution is increased or decreased in accordance with the increase or decrease in the measured value of the external absorbance, the injection amount of hydrogen peroxide can be changed at an appropriate timing, and the control delay problem can be solved. In addition, since the dilution ratio of hydrogen peroxide with water is changed at least once based on the measured value of TOC or UV absorbance, the shortage of hydrogen peroxide water injection due to insufficient flow rate of the dosing pump is easily resolved. And proper control is possible. In addition, the frequency | count of a change can be made into 2 times or more as needed. Details will be described later.

  Further, contrary to the control delay, it is not preferable that the hydrogen peroxide injection amount control timing is too early than the measurement timing of the measurement value of the TOC or ultraviolet absorbance. The invention is preferred. That is, in the hydrogen peroxide injection control method according to claim 2 or 6, the ozone injection amount in the accelerated oxidation treatment step is changed in accordance with a change in the measured value of the TOC or ultraviolet absorbance, and the ozone injection amount is changed. When controlling the injection amount of the hydrogen peroxide solution in accordance with the change of, a predetermined time lag is set in advance between the measurement time point and the addition time point of the hydrogen peroxide solution injection amount according to the result, The addition time of the injection amount is delayed for a predetermined time from the measurement time (Claim 7).

  Next, as the invention of the hydrogen peroxide injection control device, the inventions of the following claims 8 to 9 are preferable. That is, an apparatus for carrying out the hydrogen peroxide injection control method according to claim 1, wherein an ozone contact tank, an accelerated oxidation treatment tank provided in a subsequent stage, a hydrogen peroxide storage tank, A variable pump for injecting hydrogen oxide water, a TOC or ultraviolet absorbance measuring means for water to be treated, a hydrogen peroxide dilution water supply means, an ozone gas and hydrogen peroxide water injection amount control means, and a dilution rate change control means, (Claim 8).

  An apparatus for carrying out the hydrogen peroxide injection control method according to claim 5 or 6, wherein an ozone contact tank, an accelerated oxidation treatment tank provided at a subsequent stage, a hydrogen peroxide solution storage tank, a plurality of Variable pump for hydrogen peroxide water injection, total organic carbon (TOC) or ultraviolet absorbance measurement means for water to be treated, hydrogen peroxide dilution water supply means, ozone gas and hydrogen peroxide water injection amount control Means (claim 9).

  According to the present invention, in the hydrogen peroxide injection control method and apparatus in the accelerated oxidation water treatment method, even if the ozone injection amount varies greatly depending on the quality of the water to be treated, an appropriate amount of hydrogen peroxide can be added at an appropriate timing. Injection control is possible.

  An embodiment of the present invention will be described below with reference to FIGS. Although there are various modifications as the embodiment, first, a basic embodiment will be described with reference to FIGS. FIG. 1 shows a system diagram according to the present invention when highly treated water is used as a hydrogen peroxide dilution, and FIG. 2 shows the TOC of water to be treated, the ozone injection rate, the hydrogen peroxide injection rate, etc. It is a figure explaining the Example which concerns on invention of Claim 1 or 2 of the relationship of these.

  In FIG. 1, the water to be treated is introduced into the ozone contact tank 2 from the introduction port 1 by natural flow or by pumping water, and the ozone gas generated in the ozone generator 3 passes through the ozone diffuser (1) 4 to the first stage. It is introduced into the ozone contact tank 2. In the ozone contact tank 2, the organic components in the water to be treated are decomposed to some extent, and unreacted ozone is detected as residual ozone at the same time.

  The water to be treated after the reaction flowing out from the ozone contact tank 2 is introduced into the subsequent accelerated oxidation treatment tank 5 and injected by the ozone supplied from the diffuser (2) 6 and the variable pump 7 for hydrogen peroxide injection. Reacts with generated hydrogen peroxide. After the decomposition of the hardly decomposable components in the accelerated oxidation treatment tank 5, the remaining hydrogen peroxide is decomposed in the biological activated carbon tower 8 and the like, and is discharged out of the system from the discharge port 9 as highly treated water. .

  At this time, the controller 10 detects the value of the dissolved ozone concentration monitoring device 11 provided at the outlet of the ozone contact tank 2 to control the amount of ozone injected into the ozone contact tank 2 and at the same time, the accelerated oxidation treatment tank 5. The ozone gas injection amount supplied to the gas is controlled, and the hydrogen peroxide injection variable pump 7 is controlled so that the hydrogen peroxide injection rate is equal to the ozone gas injection amount and a preset injection ratio. The ozone gas injection amount supplied to the accelerated oxidation treatment tank 5 may be linked to the ozone injection amount into the ozone contact tank 2, but may be selected independently. Here, the hydrogen peroxide concentration in the hydrogen peroxide storage tank 16 for addition is measured by measuring the TOC of the water to be treated with the online TOC meter 17 and storing the commercially available hydrogen peroxide based on the measurement result. Control is performed using a low flow rate variable pump (1) 13 that supplies hydrogen peroxide solution from the hydrogen peroxide solution storage tank 12 and a variable pump (2) 15 that supplies returned advanced treated water 14.

Next, an embodiment for controlling the ozone injection rate, the hydrogen peroxide injection rate, and the like will be described with reference to FIG. Fig. 2 shows that when the treatment flow rate of treated water is 20000 m ³ / day, the ozone injection rate is determined so that the dissolved ozone concentration at the outlet of the ozone contact tank 2 is 0.1 mg / L. It is the Example selected so that it might become 2 times in molar ratio with respect to an ozone injection rate. If the TOC of the water to be treated is 1.4 mg / L or less, the hydrogen peroxide concentration in the hydrogen peroxide storage tank 16 for addition is automatically adjusted to a concentration of 1619 mg / L of 35% hydrogen peroxide solution diluted 250,000 times. adjust. If the TOC is 1.4 mg / L or more, the hydrogen peroxide concentration in the hydrogen peroxide storage tank 16 for addition is automatically adjusted to a concentration of 3238 mg / L obtained by diluting 35% hydrogen peroxide water 125,000 times. .

  As described above, by changing the hydrogen peroxide concentration in the hydrogen peroxide storage tank 16 for addition according to the TOC of the water to be treated, it becomes possible to control within the allowable flow rate range of the hydrogen peroxide injection variable pump 7, and the water quality changes. It becomes possible to cope with. Here, the dilution rate of 35% hydrogen peroxide solution was varied around TOC1.4mg / L, but the relationship between TOC and dilution rate is not limited to this value. It is appropriately set depending on the processing conditions such as the flow rate range and the processing flow rate of the water to be treated.

  Next, FIG. 3 will be described. FIG. 3 is a system diagram showing an example of the case where dechlorinated water is used as the hydrogen peroxide diluent. The difference from FIG. 1 is that the hydrogen peroxide solution is returned to FIG. In this case, dechlorinated water 18 obtained by desalting tap water using activated carbon or the like is used instead of the advanced treated water 14. The method for controlling the injection of ozone and hydrogen peroxide is the same as that shown in FIGS.

  Next, the invention relates to claim 4, comprising a hydrogen peroxide solution storage tank for addition diluted to at least two kinds of concentrations having different dilution ratios, and supplying either one of these tanks to supply the hydrogen peroxide solution The embodiment will be described. FIG. 4 shows a system diagram when one of the two hydrogen peroxide storage tanks for addition is selected. The difference between FIG. 4 and FIG. 1 is that, in the case of FIG. 4, in addition to the hydrogen peroxide storage tank 16 for addition of FIG. Along with this, a line connecting the neighboring member and the tank (2) is added.

  The control method of ozone and hydrogen peroxide in FIG. 4 is the same as that in FIG. 1, and the relationship between the TOC of water to be treated corresponding to FIG. 2 and the ozone injection rate, hydrogen peroxide injection rate, etc. An embodiment according to the invention is shown in FIG. In FIG. 7, the hydrogen peroxide storage tank 1 for addition shows the hydrogen peroxide storage tank 16 for addition in FIG. 4, and the tank 2 shows the hydrogen peroxide storage tank (2) 21 for addition in FIG.

  As shown in FIG. 7, the concentration of hydrogen peroxide in tank 1 (additional hydrogen peroxide storage tank 16) is 1619 mg / L of 35% hydrogen peroxide solution diluted 250,000 times, and tank 2 (additional hydrogen peroxide). The hydrogen peroxide concentration in the storage tank (2) 21) is automatically adjusted to a concentration of 3238mg / L obtained by diluting 35% hydrogen peroxide water 125,000 times. If the TOC of the treated water is 1.4mg / L or less For example, hydrogen peroxide is injected from the hydrogen peroxide storage tank 16 for addition in FIG. If the TOC is 1.4 mg / L or more, hydrogen peroxide is injected from the hydrogen peroxide storage tank (2) 21 for addition using the hydrogen peroxide injection variable pump 7. By selecting one of the hydrogen peroxide storage tanks with different concentrations depending on the TOC of the treated water, it can be controlled within the allowable flow rate range of the hydrogen peroxide injection variable pump, and can respond to fluctuations in water quality. It becomes. Here, one of two hydrogen peroxide storage tanks with different concentrations around TOC 1.4 mg / L was selected. The concentration of hydrogen peroxide in the TOC and hydrogen peroxide storage tanks for addition is The value is not limited, and is set as appropriate according to the processing conditions such as the flow rate range of the hydrogen peroxide injection variable pump and the processing flow rate of the water to be treated.

  Next, FIG. 5 will be described. FIG. 5 shows a system diagram different from FIG. The difference between FIG. 5 and FIG. 4 is that in the case of FIG. 5, dechlorinated water 18 is used instead of the dilution water (advanced treated water) in FIG. 4 and the online TOC meter 17 in FIG. This is a point using an absorptiometer 20. Also in this case, the same hydrogen peroxide injection control method as in the embodiment shown in FIG. 7 can be implemented.

  Next, FIG. 6 and FIG. 8 will be described. FIG. 6 shows a system diagram according to the present invention when there are a plurality of variable pumps for injecting hydrogen peroxide, and highly treated water is used as a dilute solution of hydrogen peroxide, and FIG. It is a figure explaining the Example which concerns on the invention of Claim 5 or 6 of the relationship between TOC of water, ozone injection rate, hydrogen peroxide injection rate, etc.

  The difference between FIG. 6 and FIG. 1 is that, in the case of FIG. 6, in addition to the hydrogen peroxide injection variable pump 7 of FIG. Accordingly, a line connecting the neighboring member and the variable pump (2) is added.

As in the case of FIG. 2, the embodiment of FIG. 8 has a treatment flow rate of 20000 m ³ / day, and the ozone injection rate is determined to be a dissolved ozone concentration of 0.1 mg / L at the outlet of the ozone contact tank 2. The hydrogen peroxide injection rate was selected to be twice the molar ratio with respect to the ozone injection rate. The hydrogen peroxide concentration in the hydrogen peroxide storage tank 16 for addition in FIG. 6 is automatically adjusted to a concentration of 1619 mg / L obtained by diluting 35% hydrogen peroxide water 250,000 times, and the TOC of the treated water is 1.4 mg / liter. If it is less than or equal to L, one of the hydrogen peroxide injection variable pumps 7 can handle it. If the TOC is 1.4 mg / L or more, two units of the hydrogen peroxide injection variable pump 7 and the hydrogen peroxide injection variable pump (2) 19 are used.

  As described above, by changing the number of hydrogen peroxide injection variable pumps according to the TOC of the water to be treated, it becomes possible to control within the allowable flow rate range of the hydrogen peroxide injection variable pump, and to cope with water quality fluctuations. Become. Here, the number of hydrogen peroxide injection pumps was varied between 1 and 2 around TOC1.4mg / L, but the relationship between TOC and the number of pumps is not limited to this value. It is set according to the processing conditions such as the flow rate range of the variable pump for injecting hydrogen oxide and the processing flow rate of the water to be treated. The number of pumps can be three or more.

The system system | strain diagram which concerns on this invention at the time of using highly processed water for the dilution liquid of hydrogen peroxide. The figure explaining the Example which concerns on invention of Claim 1 or 2 regarding the relationship between TOC of to-be-processed water, an ozone injection rate, a hydrogen peroxide injection rate, etc. FIG. FIG. 3 is a system diagram different from FIG. 1 according to the present invention (when the diluent is dechlorinated water). FIG. 2 is a system diagram different from FIG. 1 according to the present invention (in the case of a plurality of hydrogen peroxide storage tanks). FIG. 5 is a system diagram different from FIG. 4 according to the present invention (when measuring ultraviolet absorbance). FIG. 2 is a system diagram different from FIG. 1 according to the present invention (when there are a plurality of variable pumps for hydrogen peroxide injection). The figure explaining the Example which concerns on invention of Claim 4 of a relationship, such as TOC of to-be-processed water, an ozone injection rate, and a hydrogen peroxide injection rate. The figure explaining the Example which concerns on invention of Claim 5 or 6 regarding the relationship between TOC of to-be-processed water, an ozone injection rate, a hydrogen peroxide injection rate, etc. FIG. The figure which shows the relationship between the number of strokes per unit time of a chemical injection pump, and flow volume.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Introduction port, 2 Ozone contact tank, 3 Ozone generator, 4 Air diffuser (1), 5 Promote oxidation treatment tank, 6 Air diffuser (2), 7 Hydrogen peroxide injection variable pump, 8 Biological activated carbon tower, 9 Discharge port, 10 control device, 11 dissolved ozone monitoring device, 12 hydrogen peroxide storage tank, 13 low flow variable pump (1), 14 returned advanced treated water, 15 variable pump (2), 16 excess for addition Hydrogen oxide water storage tank, 17 Online TOC meter, 18 Dechlorinated water, 19 Variable pump for hydrogen peroxide injection (2), 20 Absorption photometer, 21 Hydrogen peroxide water storage tank for addition (2)

Claims (9)

  Oxidized water treatment that treats water to be treated with ozone gas in an ozone contact tank and performs ozone treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation tank In the hydrogen peroxide injection control method in the method, the hydrogen peroxide injection amount in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step, and hydrogen peroxide injection is Hydrogen peroxide is diluted with water and hydrogen peroxide water is used. At that time, at least one of total organic carbon (TOC) and ultraviolet absorbance of the water to be treated is measured, and based on this measurement value, hydrogen peroxide The required injection amount of water is predicted, and based on the prediction, the dilution ratio of the hydrogen peroxide with water is changed at least once. Alternatively, when the measured value of ultraviolet absorbance is large (or small), the dilution ratio is small (or large), and the hydrogen peroxide injection amount is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. The hydrogen peroxide injection control method in the accelerated oxidation water treatment method is characterized in that the amount added in the accelerated oxidation treatment step is controlled based on the diluted concentration of the hydrogen peroxide solution.   Oxidized water treatment that treats water to be treated with ozone gas in an ozone contact tank and performs ozone treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation tank In the hydrogen peroxide injection control method in the method, a relationship between the total organic carbon (TOC) value in the water to be treated and / or the ozone injection amount in the accelerated oxidation treatment step with respect to the ultraviolet absorbance value is determined in advance. Measure the total organic carbon (TOC) of the water to be treated and / or ultraviolet absorbance, and determine the ozone injection amount in the accelerated oxidation treatment step based on the relationship between the measured value and the predetermined ozone injection amount. The injection amount of hydrogen peroxide in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step, and Hydrogen oxide is injected with hydrogen peroxide solution obtained by diluting hydrogen peroxide with water, and at this time, the dilution ratio of the hydrogen peroxide with water is changed at least once. When the measured value of the external absorbance is large (or small), the dilution ratio is made small (or large) so that the hydrogen peroxide injection amount is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. In addition, the hydrogen peroxide injection control method in the accelerated oxidation water treatment method is characterized in that the amount added in the accelerated oxidation treatment step is controlled based on the diluted concentration of the hydrogen peroxide solution.   3. The hydrogen peroxide injection control method according to claim 1, wherein the water for diluting the hydrogen peroxide is a dechlorination treatment of highly treated water, membrane filtered water or tap water treated by the accelerated oxidizing water treatment method. A hydrogen peroxide injection control method in an accelerated oxidation water treatment method, characterized by using dechlorinated water or ion exchange water.   3. The hydrogen peroxide injection control method according to claim 1 or 2, wherein at least one change of the dilution ratio of the hydrogen peroxide with water is performed by adding hydrogen peroxide for addition diluted to at least two types of concentrations having different dilution ratios. Hydrogen peroxide injection in the accelerated oxidation water treatment method, characterized in that any one of the water storage tanks is selected and hydrogen peroxide water is injected into the accelerated oxidation treatment tank from the selected hydrogen peroxide solution storage tank for addition. Control method.   Oxidized water treatment that treats water to be treated with ozone gas in an ozone contact tank and performs ozone treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation tank In the hydrogen peroxide injection control method in the method, the hydrogen peroxide injection amount in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step, and hydrogen peroxide injection is Hydrogen peroxide is diluted with water at a predetermined magnification, and the amount of the hydrogen peroxide solution added to the accelerated oxidation process step is controlled by the flow rates of a plurality of flow rate variable pumps. , Measure the total organic carbon (TOC) of the water to be treated or the ultraviolet absorbance, and predict the required injection amount of the hydrogen peroxide solution based on the measured value. The increase / decrease based on the prediction is determined such that the movable number of the plurality of variable flow rate pumps is determined, and the hydrogen peroxide injection amount is in a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step. In addition, the hydrogen peroxide injection control method in the accelerated oxidation water treatment method is characterized in that the flow rate control of the plurality of variable flow rate pumps is performed.   Oxidized water treatment that treats water to be treated with ozone gas in an ozone contact tank and performs ozone treatment by mixing and injecting ozone gas and hydrogen peroxide in the accelerated oxidation tank In the hydrogen peroxide injection control method in the method, a relationship between the total organic carbon (TOC) value in the water to be treated and / or the ozone injection amount in the accelerated oxidation treatment step with respect to the ultraviolet absorbance value is determined in advance. Measure the total organic carbon (TOC) of the water to be treated and / or ultraviolet absorbance, and determine the ozone injection amount in the accelerated oxidation treatment step based on the relationship between the measured value and the predetermined ozone injection amount. The injection amount of hydrogen peroxide in the accelerated oxidation treatment step is a predetermined ratio with respect to the ozone injection amount in the accelerated oxidation treatment step, and Hydrogen peroxide injection is performed by controlling the flow of hydrogen peroxide obtained by diluting hydrogen peroxide with water at a predetermined magnification by controlling the flow rate of a plurality of variable flow rate pumps. .   The hydrogen peroxide injection control method according to claim 2 or 6, wherein the ozone injection amount in the accelerated oxidation treatment step is changed in accordance with a change in the measured value of the TOC or ultraviolet absorbance, thereby changing the ozone injection amount. Accordingly, when controlling the injection amount of the hydrogen peroxide solution, a predetermined time lag is set between the measurement time point and the addition point of the hydrogen peroxide solution injection amount according to the result. A hydrogen peroxide injection control method in an accelerated oxidation water treatment method, wherein the addition time is delayed for a predetermined time from the measurement time.   It is an apparatus which implements the hydrogen peroxide injection | pouring control method of Claim 1 or 2, Comprising: An ozone contact tank, the accelerated oxidation processing tank provided in the back | latter stage, a hydrogen peroxide solution storage tank, and hydrogen peroxide solution A variable pump for injection, a TOC or ultraviolet absorbance measuring means for water to be treated, a hydrogen peroxide dilution water supply means, an ozone gas and hydrogen peroxide water injection amount control means, and a dilution rate change control means. A hydrogen peroxide injection control apparatus in an accelerated oxidized water treatment method characterized by the above.   An apparatus for performing the hydrogen peroxide injection control method according to claim 5 or 6, comprising an ozone contact tank, an accelerated oxidation treatment tank provided at a subsequent stage, a hydrogen peroxide solution storage tank, and a plurality of hydrogen peroxide injection tanks. A variable pump for injecting hydrogen oxide water, measuring means for total organic carbon (TOC) or ultraviolet absorbance of water to be treated, dilute water supply means for hydrogen peroxide, and ozone gas and hydrogen peroxide water injection amount control means A hydrogen peroxide injection control device in an accelerated oxidized water treatment method, comprising:

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