Water treatment system

Abstract

To provide an organic material analysis system that can determine an organic material concentration of a water to be treated and analyze characteristics of an organic material, and a water processing system that controls a water processing facility on the basis of an analysis result.SOLUTION: An organic material analysis system includes: a measuring device that adds an oxidant to a sample to decompose an organic material by chemical oxidation to generate a carbon dioxide so as to detect the carbon dioxide; and an analysis device 1 that acquires a detection result of the measuring device to use the detection result to calculate a total organic carbon concentration of the sample. The analysis device 1 acquires characteristic information for the organic material on the basis of the presence or absence of addition of the oxidant or a difference in the total organic carbon concentration calculated when the added oxidants are different in kind.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an organic matter analysis system that measures the organic matter concentration in water to be treated and analyzes the characteristics of the organic matter, and a water treatment system that controls water treatment equipment based on the analysis results. [Background technology]

[0002] Total organic carbon (TOC) is one of the basic indicators of water quality analysis, and is expressed as the total amount of organic matter present in water, expressed as the amount of carbon contained in the organic matter. It is widely used as an item for managing organic matter in water treatment.

[0003] Carbon dioxide is generated when organic matter contained in a sample for which TOC is to be measured is oxidatively decomposed. The amount of carbon dioxide generated is proportional to the amount of carbon contained in the organic matter in the oxidatively decomposed sample, so the organic carbon concentration of the sample can be calculated by measuring the amount of carbon dioxide generated and comparing it with the results when a solution of known concentration (standard substance) is measured.

[0004] There are two known methods for oxidizing organic matter: combustion oxidation and wet oxidation. In the combustion oxidation method, a sample is injected into a high-temperature combustion furnace and the organic matter in the sample is burned to produce carbon dioxide. In the wet oxidation method, an oxidizing agent is added to the sample and the organic matter in the sample is chemically oxidized and decomposed to produce carbon dioxide. Conventional TOC analyzers (total organic carbon analyzers), regardless of the method used, only measure the organic carbon concentration corresponding to the amount of organic matter in the sample, and do not provide information on the characteristics of the organic matter (molecular weight, structure, solubility, etc.).

[0005] Patent Document 1 describes an ultrapure water production system in which two TOC meters with different oxidative decomposition capabilities are installed, the concentration of persistent TOC is calculated from the difference between the measured values, and when the concentration of persistent TOC exceeds a predetermined value, the amount of ultraviolet light irradiation is reduced and / or a process for decomposing / removing the persistent TOC components from the water to be treated is performed.

[0006] The device described in Patent Document 1 is intended for ultrapure water with a low organic concentration, so depending on the organic concentration, it may not be able to fully decompose the organic matter, and accurate measurement results may not be obtained. Also, it is difficult to target water with a large variety of organic components, such as wastewater or environmental water. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-5829 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above-mentioned conventional situation, and has an objective of providing an organic matter analysis system that can determine the organic matter concentration in the water to be treated and analyze the characteristics of the organic matter, and a water treatment system that controls the water treatment equipment based on the analysis results. [Means for solving the problem]

[0009] [1] A measuring device for adding an oxidizing agent to a sample, decomposing organic matter by chemical oxidation to generate carbon dioxide, and detecting the carbon dioxide; an analyzer that acquires a detection result from the measurement device and calculates a total organic carbon concentration of the sample using the detection result; Equipped with The analysis device obtains information about the characteristics of the organic matter based on the difference in total organic carbon concentration calculated when an oxidizing agent is added or when the type of oxidizing agent added is different, in an organic matter analysis system.

[0010] [2] The organic matter analysis system according to [1], wherein the characteristics of the organic matter include at least one of molecular weight, structure, functional group, constituent elements, solubility, and particle size.

[0011] [3] A water treatment facility; [1] An analysis system according to the present invention; Equipped with The sample is water to be treated that is supplied to the water treatment facility, The analysis device controls operating conditions of the water treatment facility based on the acquired information on the characteristics of the organic matter.

[0012] [4] a first measurement device that adds an oxidizing agent to the sample, decomposes organic matter in the sample by chemical oxidation to generate carbon dioxide, and detects the generated carbon dioxide; a second measurement device that injects a sample into a combustion tube, burns organic matter in the sample to generate carbon dioxide, and detects the generated carbon dioxide; an analyzer that calculates a first total organic carbon concentration of the sample using the detection result of the first measurement device, calculates a second total organic carbon concentration of the sample using the detection result of the second measurement device, and acquires information on characteristics of the organic matter based on a difference between the first total organic carbon concentration and the second total organic carbon concentration; An organic matter analysis system comprising: Effect of the Invention

[0013] According to the present invention, the organic matter concentration in the water to be treated can be obtained and the characteristics of the organic matter can be analyzed. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic configuration diagram of an organic matter analyzing system according to an embodiment of the present invention. [Diagram 2] FIG. 13 is a schematic configuration diagram of an organic matter analyzing system according to another embodiment. [Diagram 3] FIG. 13 is a schematic configuration diagram of an organic matter analyzing system according to another embodiment. [Figure 4] FIG. 13 is a schematic configuration diagram of an organic matter analyzing system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The organic matter analysis system according to the embodiment of the present invention uses a wet oxidation type TOC measurement device that adds an oxidizing agent to a sample (sample water, water to be treated), decomposes organic matter by chemical oxidation to generate carbon dioxide, measures the amount of carbon dioxide generated, and determines the total organic carbon concentration. Different types of oxidizing agents are added to the sample, the total organic carbon concentration is calculated for each type of oxidizing agent added, and information on the characteristics of the organic matter contained in the sample is obtained from the difference in the calculated total organic carbon concentrations. Hereinafter, the embodiment will be described with reference to the drawings.

[0016] For example, as shown in FIG. 1, oxidizing agent A is added to the sample, and the organic matter in the sample is chemically oxidized and decomposed to generate carbon dioxide. The oxidation reaction may be reinforced by heating (100°C or less) or ultraviolet irradiation. The generated carbon dioxide is dehumidified and cooled as necessary. An NDIR detector (non-dispersive infrared gas detector) can be used to quantify the generated carbon dioxide. The analyzer 1 obtains the detection result of the NDIR detector online and compares it with the calibration curve to determine the total organic carbon concentration of the sample.

[0017] In addition, oxidant B, which has a different oxidizing power from oxidant A, is added to the sample, and the organic matter in the sample is chemically oxidized and decomposed to generate carbon dioxide. The oxidation reaction may be reinforced by heating (100°C or less) or ultraviolet irradiation. The amount of carbon dioxide generated is quantified using an NDIR detector. The analyzer 1 obtains the detection results of the NDIR detector online and compares them with the calibration curve to determine the total organic carbon concentration of the sample.

[0018] The analytical device 1 obtains information on the characteristics (quality) of the organic matter contained in the sample from the difference between the total organic carbon concentration obtained when oxidant A is added to the sample and the total organic carbon concentration obtained when oxidant B is added to the sample.

[0019] Here, the characteristics of organic matter include, for example, chemical characteristics such as molecular weight, structure, functional groups, and constituent elements, and physical characteristics such as solubility, particle size, etc. When an oxidizing agent (A) that can provide sufficient dissociation energy to the strength of the chemical bonds of the organic matter is used, the organic matter is decomposed, but when an oxidizing agent (B) with a lower dissociation energy is used, the organic matter cannot be decomposed, and therefore, information on the amount of organic matter with different chemical structures can be obtained from the difference between the total organic carbon concentration when oxidizing agent A is added and the total organic carbon concentration when oxidizing agent B is added.

[0020] In addition, for example, organic matter with high hydrophobicity has less opportunity to come into contact with oxidants in aqueous solution, and is therefore more susceptible to decomposition by oxidants with higher oxidizing power. Therefore, information regarding the difference in hydrophobicity / hydrophobicity of organic matter can be obtained from the difference in total organic carbon concentration obtained using oxidants with different oxidizing power.

[0021] For example, organic matter with a large molecular weight has a three-dimensional structure in an aqueous solution in which the hydrophobic parts of the molecular structure are close to each other and face inward, while the hydrophilic parts face outward (toward the water). Since the oxidizing agent can only come into contact with the organic matter from the outside, the larger the molecular weight of the organic matter, the longer it takes to decompose it. In other words, information about differences in the molecular weight of organic matter can be obtained from the difference in total organic carbon concentration obtained using oxidizing agents with different oxidizing powers.

[0022] The oxidizing agent used is one that does not contain organic carbon and does not generate carbon dioxide by decomposition. Examples of the oxidizing agent include sodium peroxodisulfate, ozone, oxygen, inorganic acids such as nitric acid, sulfuric acid, and phosphoric acid, persulfates such as ammonium persulfate, sodium persulfate, and potassium persulfate, halogen oxides such as sodium hypochlorite, metal oxides such as lead dioxide, bismuth oxide, and gold oxide, and hydrogen peroxide.

[0023] In particular, examples of combinations of oxidizing agents A and B include "sodium peroxodisulfate and hydrogen peroxide" and "sodium peroxodisulfate and sodium hypochlorite." When sodium peroxodisulfate and hydrogen peroxide are used as oxidizing agents A and B, information on the amount of organic matter with different chemical structures can be obtained from the difference with the total organic carbon concentration. When sodium peroxodisulfate and sodium hypochlorite are used as oxidizing agents A and B, information on the amount of organic matter derived from biological metabolites can be obtained from the difference with the total organic carbon concentration.

[0024] The characteristics of organic matter are also related to the removal of organic matter in the water treatment process of the water treatment facility 2, contamination of functional materials, and activity of biological treatment. Therefore, the analysis device 1 predicts troubles in the water treatment facility 2, monitors the state, and controls and determines the operating conditions, based on the acquired information on the characteristics of organic matter. This allows the water treatment facility 2 to operate stably. The sample may be water to be treated that is supplied to the water treatment facility 2, or treated water after treatment in the water treatment facility 2. For example, when the analysis device 1 acquires information on an increase in the amount of organic matter derived from biological metabolites as the characteristics of organic matter, it performs control such as increasing the amount of flocculant added in the flocculation treatment of the water treatment facility 2.

[0025] The type of sample is not particularly limited. By adopting a wet oxidation method and strengthening the oxidizing power, it is possible to apply it to environmental water from rivers and lakes, industrial wastewater, etc. The sample is acidified and aerated with pure air that does not contain carbon dioxide, and the inorganic carbon in the sample is removed by pretreatment before the above-mentioned measurement.

[0026] The oxidative decomposition of organic matter and the quantification of carbon dioxide when oxidant A is added, and the oxidative decomposition of organic matter and the quantification of carbon dioxide when oxidant B is added, may be performed using the same TOC measurement device or different TOC measurement devices.

[0027] As shown in Figure 2, a conductivity meter may be used to quantify carbon dioxide. The total organic carbon concentration is calculated from the change in the conductivity of the sample before the addition of the oxidizing agent and the conductivity of the sample after the oxidative decomposition of organic matter. Carbon dioxide may also be quantified using both a conductivity meter and an NDIR detector. Quantifying carbon dioxide using multiple types of detection devices allows for multiple use of control indicators.

[0028] As shown in FIG. 3, organic matter in a sample may be oxidized and decomposed by a catalyst (and ultraviolet irradiation). The catalyst may be any catalyst capable of oxidizing organic or inorganic matter contained in a sample. Examples of catalysts that can be used include metals such as iron, manganese, cobalt, chromium, nickel, tungsten, copper, silver, gold, platinum, magnesium, aluminum, zinc, silicon, tin, yttrium, zirconium, niobium, molybdenum, palladium, and titanium, as well as oxides thereof, or alloys and composite oxides thereof, as catalytically active components. The organic matter in the sample is oxidized and decomposed into carbon dioxide by the high oxidizing power obtained by the photocatalytic effect of the catalyst and ultraviolet light.

[0029] The analysis device 1 obtains information on the characteristics of organic matter from the difference between the total organic carbon concentration obtained by oxidative decomposition by adding an oxidizing agent and the total organic carbon concentration obtained by oxidative decomposition by the photocatalytic effect. This method is suitable for obtaining information on the difference between hydrophilicity and hydrophobicity as a characteristic of organic matter.

[0030] As shown in Figure 4, a wet oxidation TOC analyzer and a catalytic combustion TOC analyzer may be used to obtain information on the characteristics of organic matter from the difference in total organic carbon concentration measured by each TOC analyzer. A catalytic combustion TOC analyzer injects a sample into a combustion tube and burns the organic matter in the sample at high temperatures (650-1200°C) to generate carbon dioxide.

[0031] By calculating the difference between the total organic carbon concentration measured by a TOC analyzer using the wet oxidation method and that using a TOC analyzer using the catalytic combustion method, information mainly about solubility can be obtained as a characteristic of organic matter. This is because while the wet oxidation method is a homogeneous reaction in an aqueous solution, the catalytic combustion method can oxidize and decompose all organic matter in an aqueous solution, so the amount of particulate (undissolved) organic matter is reflected in the difference in the measured total organic carbon concentration.

[0032] Information on the characteristics of organic matter may be obtained from the difference between the total organic carbon concentration obtained by adding an oxidizing agent and irradiating ultraviolet light to oxidatively decompose the organic matter in the sample to generate carbon dioxide, and the total organic carbon concentration obtained by oxidatively decomposing the organic matter in the sample to generate carbon dioxide by irradiating ultraviolet light without adding an oxidizing agent, using a TOC measuring device of the wet oxidation method. The presence or absence of an oxidizing agent is suitable for obtaining information on chemical bonds as a characteristic of organic matter, because the dissociation of chemical bonds in various organic matter affects the ultraviolet wavelength.

[0033] In this embodiment, it is possible to change the oxidation conditions simply by changing the presence or absence of an oxidizing agent and the type of oxidizing agent. By applying oxidizing agents with different oxidizing powers, it is also possible to set the oxidizing power in detail.

[0034] The present invention is not limited to the above-described embodiment, and the components can be modified and embodied in the implementation stage without departing from the gist of the invention. In addition, various inventions can be formed by appropriately combining the multiple components disclosed in the above-described embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components from different embodiments may be appropriately combined. [Explanation of symbols]

[0035] 1 Analyzer 2. Water treatment facilities

Claims

1. a measuring device for adding an oxidizing agent to a sample, decomposing organic matter by chemical oxidation to generate carbon dioxide, and detecting the carbon dioxide; an analyzer that acquires a detection result from the measurement device and calculates a total organic carbon concentration of the sample using the detection result; Equipped with The analysis device obtains information on the characteristics of the organic matter based on the difference in total organic carbon concentration calculated when an oxidizing agent is added or when the type of oxidizing agent added is different, in an organic matter analysis system.

2. The organic matter analysis system according to claim 1 , wherein the characteristics of the organic matter include at least one of molecular weight, structure, functional group, constituent elements, solubility, and particle size.

3. Water treatment equipment; The analysis system of claim 1 ; Equipped with The sample is water to be treated that is supplied to the water treatment facility, The analysis device controls operating conditions of the water treatment facility based on the acquired information on the characteristics of the organic matter.

4. a first measurement device that adds an oxidizing agent to a sample, decomposes organic matter in the sample by chemical oxidation to generate carbon dioxide, and detects the generated carbon dioxide; a second measurement device that injects a sample into a combustion tube, burns organic matter in the sample to generate carbon dioxide, and detects the generated carbon dioxide; an analysis device that calculates a first total organic carbon concentration of the sample using the detection result of the first measurement device, calculates a second total organic carbon concentration of the sample using the detection result of the second measurement device, and acquires information on characteristics of the organic matter based on a difference between the first total organic carbon concentration and the second total organic carbon concentration; An organic matter analysis system comprising:

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