KR102152245B1 - Device for measuring dissolved organic carbon - Google Patents

Abstract

The present invention relates to a dissolved organic carbon measuring apparatus. The dissolved organic carbon measuring apparatus according to an embodiment of the present invention is an apparatus for measuring a dissolved organic carbon concentration. The dissolved organic carbon measuring apparatus comprises: a first body wherein a first cross-section, an infrared light source, an ultraviolet light source, and an infrared light receiving unit are formed; and a second body wherein a second cross-section, an ultraviolet light receiving unit, and a pair of conductive electrodes. The first body and the second body are connected by a connecting member so that the first end surface and the second end surface face each other. Between the first end surface and the second end surface is open.

Description

Device for measuring dissolved organic carbon}

The present invention relates to an apparatus for measuring dissolved organic carbon, and more particularly, to an apparatus for measuring dissolved organic carbon in real time in rivers, water purification and sewage treatment facilities.

Total Organic Carbon (TOC), which is widely used worldwide as an indicator of organic matter in surface water, is a method of measuring the total amount of organic carbon.It is easy to measure and can measure the amount of carbon in organic matter that is not oxidized chemically or biologically. .

Organic carbon has a close relationship with the chemical oxygen demand (COD) and the biochemical oxygen demand (BOD).

Total organic carbon is a value excluding inorganic carbons such as carbon dioxide (CO ₂ ) and carbonate (sodium carbonate) from total carbon, and is expressed as the sum of particulate organic carbon (POC) and dissolved organic carbon. .

Dissolved organic carbon can be classified into hydrophilic and hydrophobic, and hydrophilicity is a component that is easy to bond with water molecules and has a polar functional group, and hydrophobicity has a non-polar functional group that makes it difficult to bond with water molecules. to be.

Dissolved organic carbon becomes an energy source for bacteria during the carbon cycle process of the aquatic ecosystem and is an important source of energy transferred to the upper food chain process. In addition, dissolved organic carbon in water forms complexes with metal ions to increase or decrease the bioavailability of metals, participate in redox potential, and buffer. In addition, when water with a high dissolved organic carbon concentration is used as a water source, trihalomethane (THMs), a carcinogen, is generated by chlorine disinfection.

To measure total organic carbon in a laboratory, the amount of carbon dioxide burned by oxidizing the sample at high temperature (about 950 degrees Celsius) is measured with an infrared gas analyzer, and the total organic carbon is measured by the difference between the total carbon and inorganic carbon amount (high temperature oxidation method). Dissolved organic carbon is passed through a membrane filter having a pore size of 0.45 µm or centrifuged, and the solution is measured in the same manner as for total organic carbon.

In Korea, in the case of on-line measuring devices that are installed on-site and measured at all times, most of the total organic carbon is measured using the same method as that used in a laboratory.

In the case of total organic carbon by the high-temperature oxidation method, measurement errors may be caused by various interfering substances. Measurement errors due to halogen compounds and inorganic carbon are typical. In the case of online measuring instruments installed in the field, temperature maintenance during high-temperature oxidation, suspended substances Larger errors may occur than in the laboratory due to problems such as clogging of pipes and degradation of reagent purity.

In particular, suspended solids are one of the factors that cause the largest measurement error of dissolved organic carbon because it causes clogging of pipes in on-site measuring equipment and prevents complete oxidation of organic matter. In addition, the measurement interval of the online measuring device takes 15 minutes or more due to the nature of the analysis that the oxidation step must be performed.

In the case of online measuring equipment, there is a disadvantage of having to periodically check the measuring equipment to maintain the standard solution and heating equipment, so the price of the measuring equipment and maintenance cost are very high, and filtration to remove suspended substances for the measurement of dissolved organic carbon Or, in the case of installing a centrifugal separator, the device is complicated, so a very large maintenance cost is required.

The concentration of dissolved organic carbon in water is directly related to environmental ecology, water treatment and algae proliferation, and since the concentration changes rapidly during rainfall, the concentration of dissolved organic carbon is measured in real time with excellent reproducibility in places such as water treatment process and national water quality monitoring network. It is very important. In the case of the United States, it is recommended to keep the minimum measurement period of total organic carbon or dissolved organic carbon within 2 minutes to monitor water pollution accidents, but there is no practical alternative for this.

Korean Patent Registration No. 10-1274830 (2013.06.07) Korean Patent Registration No. 10-1655895 (2016.09.02)

An object of the present invention is to provide an apparatus for accurately measuring dissolved organic carbon concentration in real time.

The dissolved organic carbon measuring apparatus according to an embodiment of the present invention is a device for measuring the dissolved organic carbon concentration, wherein a first cross-section is formed, and a first body and a second cross-section are formed in which an infrared light source, an ultraviolet light source, and an infrared light receiving unit are formed. And a second body on which an ultraviolet light receiving part and a pair of conductive electrodes are formed, wherein the first body and the second body are connected by a connecting member so that the first end surface and the second end surface face each other, and the The first end face and the second end face are open.

In addition, the first body, the second body, and the connection member may be integrally formed.

Further, the pair of conductive electrodes includes a ground electrode and a working electrode, and electric conductivity of the treated water may be measured by applying power to the working electrode.

In addition, a filter may be installed on at least one optical path selected from the group consisting of the infrared light source, the ultraviolet light source, the infrared light receiving unit, and the ultraviolet light receiving unit.

In addition, the filter may be quartz glass.

In addition, the dissolved organic carbon measuring apparatus according to an embodiment of the present invention may further include an air pressure to remove contaminants between the first and second end surfaces.

In addition, the air pressure may include a nozzle and an air pipe, and the nozzle may be formed above the connecting member, and may be formed to allow air to be injected to the first end surface and the second end surface.

In addition, the dissolved organic carbon measuring apparatus according to an embodiment of the present invention includes the total organic carbon concentration and treated water based on the absorbance measured value of the ultraviolet light receiving unit, the electrical conductivity measured by the pair of conductive electrodes, and the measured value of the infrared light receiving unit. It may further include a calculating unit for calculating the dissolved organic carbon concentration by calculating the turbidity and particulate organic carbon concentration.

The dissolved organic carbon measuring apparatus according to an embodiment of the present invention can measure dissolved organic carbon in real time.

In addition, the dissolved organic carbon concentration can be measured without adding a separate reagent, and there is no fear of secondary contamination by the reagent.

In addition, even when measuring in real time, it is possible to accurately measure the dissolved organic carbon concentration.

In addition, since maintenance of the measuring device is hardly required, the cost for measuring the dissolved organic carbon concentration is reduced, and measurement can be performed simply without additional manpower input.

1 is a perspective view of a dissolved organic carbon measuring apparatus according to an embodiment of the present invention.
2 is an enlarged view of an infrared light source and an infrared light receiving unit according to an embodiment of the present invention.
3 is a graph showing the correlation between the total organic carbon concentration using KHP and the total organic carbon concentration according to UV254 absorbance according to an embodiment of the present invention.
4 is a graph of dissolved organic carbon concentration measured according to an embodiment of the present invention.
5 is a conceptual diagram of an installation of a dissolved organic carbon measuring apparatus according to an embodiment of the present invention.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are exemplified only for the purpose of describing the embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention They may be implemented in various forms and are not limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can apply various changes and have various forms, the embodiments will be illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named as the second component, Similarly, the second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Expressions describing the relationship between components, for example, "between" and "just between" or "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate that the specified features, numbers, steps, actions, components, parts, or combinations thereof exist, but one or more other features or numbers, It is to be understood that the presence or addition of steps, actions, components, parts or combinations thereof does not preclude the possibility of preliminary exclusion.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this specification. Does not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. The same reference numerals in each drawing indicate the same members.

1 is a perspective view of a dissolved organic carbon measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the turbidity measuring apparatus 10 according to the embodiment of the present invention has a first cross section 110, an infrared light source 120, an ultraviolet light source 130, and an infrared light receiving unit 140 The first body 100 and the second end surface 210 are formed, including a second body 200 on which the ultraviolet light receiving unit 230 and a pair of conductive electrodes 220 are formed, the first end surface ( The first body 100 and the second body 200 are connected by a connecting member 300 so that the 110 and the second end surface 210 face each other, and the first end surface 110 and the second body 200 Between the end faces 120 are open.

The first body 100 and the second body 200 are made of a material that guarantees airtightness and watertightness, and in particular, may be a metal material or a plastic material that guarantees corrosion resistance in a measurement environment in which the measurement is performed in water. In addition, the first body 100 and the second body 200 may have a cylindrical shape having the same diameter in order to minimize the influence on the flow of water, but are not limited thereto.

As shown in FIG. 1, the first body 100 has a first end surface 110 formed on one side thereof. The first end surface 110 may be a region in which light is irradiated by the ultraviolet light source 130 and the infrared light source 120 and the infrared scattered light is received.

The second body 200 includes an ultraviolet light receiving unit 230 for receiving ultraviolet light incident through the first body 100 through the fine particles and a pair of conductive electrodes for measuring the electrical conductivity of the treated water. Includes 220.

The connection member 300 connects the first body 100 and the second body 200 so that the first end surface 110 and the second end surface 210 discussed above face each other. In particular, the connection member 300 may be made of the same material as the first body 100 or the second body 200, and the first end surface 110 and the second body 200 of the first body 100 The first body 100 and the second body 200 are connected by firmly coupling with the connection member 300 to the second end surface 210 of the.

In addition, the dissolved organic carbon measuring apparatus 10 according to an embodiment of the present invention removes foreign substances adhering to the first end surface 110 and the second end surface 210 using compressed air, and to this end, the air pressure 310 ) Is installed.

The air pressure 310 includes an air nozzle 311 and an air pipe 312.

A pair of air nozzles 311 for removing foreign substances from the first end surface 110 and the second end surface 210 may be formed on the upper surface of the connecting member 300, and a pair of air nozzles 311 One of the) is directed toward the first end face, and the other is directed toward the second end face.

The air pipe 312 for supplying compressed air to the pair of air nozzles 311 is formed through the inside of the first body 100 or the inside of the second body 200, according to an embodiment of the present invention. A compressor (not shown) that produces compressed air may be attached to the inside of the dissolved organic carbon measuring device 10, but considering the weight and size of the device, the compressed air provided from the outside is the internal air pipe 312 It is desirable to configure it to be able to move through.

According to another embodiment, the first body 100, the second body 200, and the connection member 300 may be integrally configured.

When the first body 100, the second body 200, and the connection member 300 shown in FIG. 1 are integrally configured, the fluid is freely placed or moved on the upper part of the connection member 300 to achieve a dissolved organic carbon concentration. A region to which light for measurement may be irradiated may be formed.

As shown in FIG. 1, a first end surface 110 is formed on one side of the first body 100, and an infrared light source 120, an ultraviolet light source 130, and an infrared light receiving unit 140 may be positioned.

The infrared light source 120 may be an infrared LED, and the wavelength of the infrared light source 120 may be irradiated with a wavelength ranging from 780 nm to 1000 nm. Preferably, it may be 880 nm infrared light.

In particular, the infrared light source 120 is inclined at a predetermined angle in the normal direction of the first end surface 110.

2 is an enlarged view of an infrared light source and an infrared light receiving unit according to an embodiment of the present invention.

As shown in FIG. 2, the infrared light source 120 is irradiated at a first angle in the normal direction of the first end surface 110, and the infrared light receiving unit 140 is perpendicular to the incident angle of the particles irradiated with infrared rays. A second angle based on the normal direction of the first cross-section is also inclined to receive the scattered light.

The light emitted from the infrared light source 120 collides with the particles and is scattered, and the infrared light receiving unit 140 receives the infrared light scattered at 90 degrees to measure the concentration of the suspended material in the liquid according to the change in intensity of the light.

The reason for measuring the scattered light at 90 degrees is that the detection angle of 90 degrees is the least sensitive to changes in particle size.

The infrared light source 120 according to the embodiment of the present invention may be an infrared LED, and since an infrared LED (light emitting diode) is used as the infrared light source 120, there is little deterioration in performance even when used for a long period of time, and excellent Reproducibility is guaranteed. The infrared light source 120 is an angle in which the irradiation angle of light is inclined by a first angle in the normal direction of the first end surface 110.

When the infrared light source 120 is irradiated at a certain angle in order to detect the light scattered in the normal direction irradiated on the same plane, light scattered by the particles at 90 degrees can be received in the same plane.

As expected, since the infrared light receiving unit 140 is also inclined at a second angle in the normal direction of the first end surface 110, the device may be configured such that the sum of the first angle and the second angle may be 90 degrees.

The infrared light receiving unit 140 may be an infrared measurement photodiode capable of reacting to a wavelength in an infrared region.

The ultraviolet light source 130 formed in the first body 100 may use an ultraviolet LED. Ultraviolet rays have a short wavelength, but have high energy, so they have high sensitivity to small particles. Unlike the infrared light source 120, the ultraviolet light source 130 formed in the first body 100 measures the intensity of the ultraviolet light source that transmits the particles, that is, the absorbance, and calculates the total organic carbon concentration (TOC) according to the distribution of small particles. Measure.

UV rays can be classified into UVV (100-200 nm), UVC (200-280) nm, UVB (280-315 nm), and UVA (315-400 nm) depending on the wavelength range.

The wavelength of the ultraviolet light irradiated by the ultraviolet light source 130 according to the exemplary embodiment of the present invention is 254 nm.

In the US EPA 415.3 and Standard Method, the relationship between UV254 and KHP, which is the total organic carbon concentration expressed as potassium hydrogen phthalate, is defined as in Equation 1 below.By using the absorbance of UV254, the relationship between the total organic carbon value can be estimated. Because there is.

[Equation 1]

UV254 = 0.0144 × KHP + 0.0018

The ultraviolet light receiving unit 230 formed in the second body 200, which will be described below, detects the intensity of ultraviolet light that is transmitted and reached by the light irradiated from the ultraviolet light source 130, and uses this to detect the absorbance by the actual particles. Is measured.

A second end surface 210 is formed on the second body 200 according to an embodiment of the present invention, and an ultraviolet light receiving unit 230 is formed. The ultraviolet light receiving unit 230 may be a photodiode for ultraviolet measurement capable of receiving light in an ultraviolet region.

Measuring the absorbance using the intensity of light received by the ultraviolet light receiving unit 230 is calculated by measuring the ratio of transmitted light to the incident light as shown in Equation 2 below. This is because absorbance is calculated using a generally published spectrophotometric method, and a detailed description is omitted.

( https://en.m.wikipedia.org/wiki/Spectrophotometry)-See link

[Equation 2]

A = log (Io/I) = a × b × c

Here, A is absorbance, Io is the intensity of light in the absence of a light-absorbing material, I is the intensity of light in the presence of a light-absorbing material, a is the absorption coefficient, b is the optical path width (path length, mm), and c is the concentration (mg/L) to be.

The pair of conductive electrodes 220 is used to measure the electrical conductivity of the treated water. The pair of conductive electrodes 220 includes a ground electrode 222 and a working electrode 221, and power is applied to the working electrode 221 to measure the electrical conductivity of the treated water.

In general, the electrolyte dissociates into cations and negative silver in a solution, making the solution conductive. A conductive solution carries current, and the degree to which it carries current is expressed as electrical conductivity. In particular, this degree of difference can be evaluated by the strength of ions in the solution.

The unit of electrical conductivity is S(Siemens)/m or 1/Ωm. The pair of conductive electrodes 220 according to the embodiment of the present invention may measure electrical conductivity according to the degree to which the flow of electrons supplied from the power applied to the working electrode 221 is introduced to the ground electrode 222. .

The relationship between the measurement of dissolved organic carbon of the pair of conductive electrodes 220 according to an embodiment of the present invention will be described later.

Turbidity is also measured by using the values measured by the ultraviolet light receiving unit 230 and the infrared light receiving unit 140 according to an exemplary embodiment of the present invention.

There are turbidity units according to various turbidity measurement principles, but the most widely used turbidity unit is NTU (Nephelometric Turbidity Unit), which refers to a unit for measuring turbidity using a nephelometer. Even in Korea, the drinking water standard (revised on February 11, 1999) stipulates that turbidity is measured in NTU units.

In the present invention, the ultraviolet absorbance of UVA254 and the infrared 90 degree scattered light are measured at the same time, and the turbidity due to the fine particles is corrected by the ultraviolet absorbance. Measure

The filter 400 may be installed on at least one light path selected from the group consisting of the infrared light source 120, the ultraviolet light source 130, the infrared light receiving unit 140, and the ultraviolet light receiving unit 230 described above.

The filter 400 serves to protect the light sources 120 and 130 and the light receiving units 140 and 230 by preventing particulates from directly contacting the light sources 120 and 130 and the light receiving units 140 and 230. In particular, the filter 400 may be a quartz glass having a low light absorption rate, but is not limited thereto.

In addition, the interval between the first end surface 110 and the second end surface 210 may be 20 mm to 60 mm.

This interval is suitable for measuring turbidity of general water treatment facilities and turbidity of secondary wastewater treatment water. This optical path width (thick arrow in FIG. 1) can be adjusted according to turbidity, but if the distance is less than 20 mm, it may interfere with measurement of 90 degree scattered light, so the minimum distance may be 20 mm. In addition, the maximum distance is 60 mm, but if it is wider than this, the intensity of ultraviolet absorbance decreases, and thus measurement error may increase.

Depending on the embodiment, a device capable of adjusting the optical path width may be configured. This may vary the accuracy of the turbidity measurement of the treated water according to the optical path width, and thus the optical path width may be adjusted in consideration of this.

The dissolved organic carbon measuring apparatus 10 according to an embodiment of the present invention includes absorbance of UV254 (measured value of the ultraviolet light receiving unit), electrical conductivity measured by a pair of conductive electrodes 220, and measured value of the infrared light receiving unit 140 ( The turbidity is calculated using the intensity of the scattered light) and the measured value of the ultraviolet light receiving unit 230), and a calculation unit 600 for calculating the total organic carbon concentration, the particulate organic carbon concentration, and the dissolved organic carbon concentration is further included. do.

The operation unit 600 may be installed inside the dissolved organic carbon measuring apparatus 10 according to the embodiment of the present invention, but a wired/wireless communication device separately installed in the dissolved organic carbon measuring apparatus 10 according to the embodiment of the present invention ( It may be installed on an external control unit that can be connected to each other through (not shown).

3 is a graph showing the correlation between the total organic carbon concentration using KHP and the total organic carbon concentration according to the UV254 absorbance according to an embodiment of the present invention.

As shown in Figure 3, the calculation unit 600 of the dissolved organic carbon measuring apparatus according to the embodiment of the present invention does not use the standard reagent KHP, but a high correlation between the concentration of total organic carbon derived using the absorbance of UV254 Calculate the total organic carbon concentration using the relationship (R ² =0.9965).

The operation unit 600 according to an embodiment of the present invention measures the total organic carbon concentration according to Equation 3 below.

[Equation 3]

TOC = A × (7.6692 × X ² + 13.73 × X)

Here, TOC is the total organic carbon (mg/L) concentration, X is UV254 absorbance, and A is a constant related to electrical conductivity.

If the electrical conductivity is less than 300 μS/cm, a value of 1 is applied to A, and if it is more than 300 μS/cm, a value between 1.0 and 2.5 is applied. The constant related to electrical conductivity is intended to correct measurement errors for substances other than organic carbon when measuring total organic carbon in high-concentration wastewater, and this value is corrected and used in the field.

The particulate organic carbon (POC) concentration is calculated by the following equation.

[Equation 4]

POC = B × (33.166 × N-8,378)

Here, POC is the particulate organic carbon concentration (mg/L), N is turbidity (NTU), and B is a constant related to electrical conductivity.

If the electrical conductivity is less than 200 µs/cm, a value of 1 is applied to the constant B, and if it is 200 µs/cm or more, a value between 1.0 and 2.0 is applied. This is to correct measurement errors for substances other than organic carbon when measuring dissolved organic carbon in high concentration wastewater, and this value is corrected and used in the field.

Here, the turbidity (NTU) N is calculated using the UV254 absorbance (the measured value of the ultraviolet photodiode is converted into the absorbance) and the measured value of the infrared scattered light at 90 degrees (the measured value of the infrared photodiode).

As a result, the calculation unit calculates the dissolved organic carbon concentration using Equation 5 below based on the total organic carbon concentration (TOC) and particulate organic carbon concentration (POC) calculated through Equations 3 and 4.

[Equation 5]

TOC (total organic carbon concentration) = POC (particulate organic carbon concentration) + DOC (dissolved organic carbon concentration)

Dissolved organic carbon by calculating the total organic carbon concentration (TOC) and particulate organic carbon concentration (POC) because the UV absorbance, the intensity of the infrared scattered light, and the electrical conductivity measured using the principles of the present invention can be measured in real time in water. Concentration (DOC) can be measured in real time.

<Example>

The dissolved organic carbon concentration is measured in the following order using the dissolved organic carbon measuring apparatus 10 according to the embodiment of the present invention, and compared with the dissolved organic carbon concentration using KHP in an actual laboratory.

The first end face 110 and the second end face 210 are cleaned using the air pressure 310. Compressed air is injected through the air nozzle 311 in the range of 5 to 10 seconds, and the compressed air pressure is maintained in the range of about 3 bar to 6 bar.

When washing of the first section 110 and the second section 210 is completed, UV254 absorbance, electrical conductivity, infrared scattered light intensity, and turbidity are measured, and the total organic carbon concentration (TOC) and particulate organic carbon concentration (POC) are measured. ) Is calculated, and finally dissolved organic carbon is measured.

4 is a graph of the results of the dissolved organic carbon concentration measured according to an embodiment of the present invention.

As shown in FIG. 4, according to the dissolved organic carbon concentration graph according to the exemplary embodiment of the present invention, data in which the total organic carbon concentration (orange graph) and the dissolved organic carbon concentration (black solid line) are measured in time series are shown.

In addition, as shown in Fig. 4, when the same treated water in an actual laboratory is measured using KHP (black dotted line) and the result obtained by the dissolved organic carbon measuring device 10 according to an embodiment of the present invention is compared, within 10% It was investigated to record the error of, and high accuracy was recorded.

5 is a conceptual diagram of an installation of a dissolved organic carbon measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 5, the dissolved organic carbon measuring apparatus 10 is immersed in the treated water at a predetermined depth, and is connected to both ends by cables 20.

The cable 20 is connected to a support 30 such as a high-strength cantilever (cantilever), and is connected to the control unit 40 on the ground.

The cable 20 can form a bundle of cables for power supply, a cable for fixing, a communication cable, a compressed air connection cable, etc., and control of power, communication, and compressed air through the cable are all on the ground. It can be performed in the control unit 40.

In addition, the control unit 40 can perform separate control, such as instructing the dissolved organic carbon measurement device 10 to measure or perform cleaning, and calibrate the measured value, measure the turbidity, and calculate the total organic carbon concentration. , It may include a calculation unit 600 for performing a particulate organic carbon concentration calculation, dissolved organic carbon concentration calculation, and the like.

As described above, the dissolved organic carbon measuring apparatus 10 according to an embodiment of the present invention more accurately measures the dissolved organic carbon concentration, but it is possible to check the measurement result in real time, so that water purification plants, sewage treatment plants, rivers It is a device that can be used to measure the dissolved organic carbon concentration in the back.

10 Turbidity measuring device 20 Cable
30 Support 40 Control
100 First body 110 First section
120 infrared light source 130 ultraviolet light source
140 Infrared light receiving unit 200 Second body
210 Second cross section 220 Pair of conductive electrodes
230 UV light receiving unit 300 connecting member
310 Air Pressure 400 Filter
600 operation unit

Claims (8)

As a device for measuring the dissolved organic carbon concentration,
A first body having a first cross-section formed therein, an infrared light source, an ultraviolet light source, and an infrared light receiving unit;
A second body having a second cross-section, an ultraviolet light receiving unit and a pair of conductive electrodes; And
The total organic carbon concentration, the turbidity of the treated water, and the particulate organic carbon concentration are calculated based on the measured absorbance of the ultraviolet light receiving unit and the electric conductivity measured by the pair of conductive electrodes and the measured value of the infrared light receiving unit, and dissolved organic carbon. Including an operation unit for calculating the concentration,
The first body and the second body are connected by a connecting member so that the first end surface and the second end surface face each other, and the first end surface and the second end surface are open to each other,
The infrared light source is irradiated with a first angle inclined in the normal direction of the first cross-section, and the infrared light receiving unit receives the light scattered vertically relative to the incident angle of the infrared-irradiated particles. Angle is tilted,
The dissolved organic carbon measuring apparatus, characterized in that the sum of the first angle and the second angle is 90 degrees. The method of claim 1,
Dissolved organic carbon measuring apparatus, characterized in that the first body, the second body and the connecting member are integrally formed. The method of claim 1,
The pair of conductive electrodes includes a ground electrode and a working electrode, and the electric conductivity of the treated water is measured by applying power to the working electrode. The method of claim 1,
The dissolved organic carbon measuring apparatus, characterized in that the filter is installed on at least one optical path selected from the group consisting of the infrared light source, the ultraviolet light source, the infrared light receiving unit and the ultraviolet light receiving unit. The method of claim 4,
Dissolved organic carbon measuring device, characterized in that the filter is quartz glass. The method of claim 1,
Dissolved organic carbon measuring apparatus, characterized in that it further comprises an air pressure to remove the contaminants between the first end surface and the second end surface. The method of claim 6,
The air compressor includes a nozzle and an air pipe, and the nozzle is formed above the connecting member, and the dissolved organic carbon measurement is formed so that air can be sprayed on the first end surface and the second end surface. Device. delete

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