JP2014211319A - Slime monitoring device, slime monitoring method, slime remover addition device, and slime remover addition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slime monitoring device capable of accurately obtaining the continuous variation of the slime adhesion state in real time, a slime monitoring method, a slime remover addition device, and a slime remover addition method.SOLUTION: The slime monitoring device includes: a first pH meter 35 and first instrument 38 for measuring the water existing in a first region 26A in a tubular member 26; a second pH meter 36 and second instrument 39 for measuring the water existing in a second region 26B to which slime is more apt to adhere than to the first region 26A; an operation unit 42 for acquiring first differential data as the difference between the measurement results of the first pH meter 35 and second pH meter 36 and second differential data as the difference between the measurement results of the first instrument 38 and second instrument 39; and a determination unit 45 for determining the adhesion state of the slime adhering to the second region 26B on the basis of the first and second differential data.

Description

  The present invention relates to a slime monitoring device for continuously monitoring the adhesion state of slime, which is a problem in a water circulation system such as an open cooling water system, a sealed cooling water system, a membrane concentrated water system, a paper pulp production process system, and a wastewater treatment process system, and a slime The present invention relates to a monitoring method, a slime remover addition device that adds a slime remover according to the state of slime adhesion, and a slime remover addition method.

  Conventionally, in water circulation systems such as open cooling water systems, sealed cooling water systems, membrane concentrated water systems, paper pulp production process systems, and wastewater treatment process systems, microorganisms grow and stick at the interface where piping and heat exchangers contact water. It has been known that fouling damage occurs due to slime, which is an adherent that has been grown by involving inorganic substances in a qualitative secretion.

  Specific fouling failures include, for example, a decrease in the heat efficiency of the heat exchanger, and corrosion of pipes and heat exchangers due to organic acids and active oxygen species secreted in the lower layer portion of the slime. Moreover, when corrosion of piping, a heat exchanger, etc. progressed, there existed a possibility that a through hole might be formed.

In addition, the slime itself may block the film, or the exfoliation of the slime may block the piping or the like. Furthermore, in the pulp and paper manufacturing process, the slime exfoliation causes a reduction in product quality.
In order to avoid the above-described slime fouling failure, a process of adding an antibacterial agent (slime removing agent) to a target aqueous system has been conventionally performed.

However, the degree of fouling failure of slime varies depending on the quality of water supplied to the target water system and the operating conditions. Also, slime fouling failure always changes due to changes in environment such as temperature and driving conditions.
Accurately grasping the state of slime adhesion is important for appropriate water treatment (for water quality management).

  As a method of monitoring the adhesion state of slime in the water system, immerse the test piece made of slide glass or rubber plate in the water system, pull up the test piece at any time, peel off the slime adhering to the test piece, A method for measuring the adhesion amount of slime is widely used.

  Such a method makes it difficult to keep the flow conditions where the test piece is immersed constant, and it is possible to roughly grasp the slime adhesion state, but it is not possible to accurately grasp the slime adhesion state. Have difficulty. In addition, it is impossible to continuously grasp changes in the state of slime adhesion in real time.

  As a method that can accurately grasp the slime adhesion status, for example, by connecting a plurality of short pipes in series, the flow conditions of the slime adhesion part are controlled to be constant, and the short pipes are sequentially removed to evaluate the amount of deposits. There are methods (see, for example, Patent Document 1 and Non-Patent Document 1).

In such a method, water is continuously passed through a short tube series, the water flow is stopped at an arbitrary time, a specific short tube is pulled out, the adhering slime is peeled off, and the amount of adhesion is measured.
Therefore, it is impossible to grasp in real time the continuous change in the state of slime adhesion.

As a method of grasping the continuous change of the slime adhesion state in real time, for example, without directly measuring the amount of slime adhesion, the differential pressure change at both ends of the straight pipe due to the slime adhesion is continuously measured. There is a method (for example, see Non-Patent Document 2).
In this method, since the amount of slime deposited is indirectly estimated from the pressure difference, it is necessary to control the flow rate condition very strictly.

JP-T 6-509640

W. G. Characklis et. al. EPLI CS-1554 Project 902-1 Final Report. Sept. , 1980 Biofilm development and description. NACE Standard RP0189-89, NACE International, Houston, USA.

  In the methods disclosed in Patent Document 1 and Non-Patent Document 1, since it is possible to arbitrarily set the flow rate condition, it is possible to more accurately grasp the state of slime adhesion under any condition. . However, it is impossible to grasp in real time the continuous change in the state of slime adhesion.

Further, in the method disclosed in Non-Patent Document 2, since the flow rate change of the water greatly affects the pressure change, the flow rate is controlled using an expensive metering valve or the like, but the flow fluctuation of the water is completely absorbed. It is difficult.
In other words, even if the slime is not attached, the reference value (reference value for judging the attachment state of the slime) is changed by changing the flow rate condition (in other words, affected by external environmental changes). Therefore, it was difficult to grasp in real time the exact slime adhesion state.

  Therefore, the present invention provides a slime monitoring device, a slime monitoring method, a slime remover addition device, and a slime remover addition method capable of accurately and continuously grasping a continuous change in the slime adhesion state. The purpose is to do.

In order to solve the above-described problem, according to one aspect of the present invention, a tubular member having an introduction portion into which water is introduced and a lead-out portion from which the water is led out, the water continuously flowing, and the tubular portion 1st pH meter which acquires 1st pH data by arrange | positioning an electrode in the 1st area | region among the area | regions in a member, and measuring the pH of the water located in this 1st area | region continuously An electrode is disposed in the first region, and the first oxygen consumption data is obtained by continuously measuring the change in dissolved oxygen concentration of water located in the first region. An electrode is arranged in a measuring device and a second region where slime adheres more easily than the first region among the regions in the tubular member, and the pH of water located in the second region is continuously adjusted. A second pH meter that acquires second pH data by measuring, and an electrode is disposed in the second region A second measuring device for obtaining second oxygen consumption data by continuously measuring a change in dissolved oxygen concentration of water located in the second region; and the first pH data, By calculating the difference from the second pH data continuously, the first difference data is obtained, and the difference between the first oxygen consumption data and the second oxygen consumption data is continuously obtained. A calculation unit that obtains the second difference data, and a determination unit that determines the adhesion state of the slime adhered to the second region based on the first and second difference data, A slime monitoring device is provided (claim 1).

Further, the tubular member has a tubular member main body, the introduction portion is disposed so as to be orthogonal to the tubular member main body corresponding to the first region, and the lead-out portion is the second portion. You may arrange | position so that it may orthogonally cross with respect to the said tubular member main body corresponding to an area | region (Claim 2).

  The first region may be disposed at one end of the tubular member body, and the second region may be disposed at the other end of the tubular member body (Claim 3).

A first annular member disposed in the first region, surrounding a periphery of the electrode of the first pH meter and the electrode of the first measuring instrument, and disposed in the second region; You may have the electrode of a 2nd pH meter, and the 2nd annular member surrounding the circumference | surroundings of the electrode of the said 2nd measuring device (Claim 4).

  The first and second measuring devices may be oxidation-reduction potentiometers or dissolved oxygen meters (Claim 5).

  Further, the water can flow and the slime adheres easily so as to cover the electrode of the second pH meter and the electrode of the second measuring instrument arranged in the second region. You may have a member for use (Claim 6).

  Moreover, the member for slime adhesion may be a mesh-shaped member.

  Moreover, you may have a display part which displays the said 1st difference data, the said 2nd difference data, and the determination result of the said determination part (Claim 8).

  According to another aspect of the present invention, the slime monitoring device according to any one of claims 1 to 8, a slime remover tank in which a slime remover is stored, and determination by the determination unit A slime remover addition device comprising: a control unit that controls whether or not to add the slime remover into a water tank connected to a flowing water pipe that transports the water based on the result. Is provided (claim 9).

  Moreover, according to the other viewpoint of this invention, the 1st pH data regarding the pH of the water located in the 1st area | region in the tubular member into which water flows continuously, and the water located in the said 1st area | region First oxygen consumption level data relating to the dissolved oxygen concentration, and second pH data relating to the pH of water located in the second region within the tubular member, to which slime is more likely to adhere than the first region, A step of continuously obtaining second oxygen consumption level data relating to the dissolved oxygen concentration of water located in the second region, and a difference between the first pH data and the second pH data. Continuously obtaining certain first difference data, and continuously obtaining second difference data that is a difference between the first oxygen consumption data and the second oxygen consumption data; Based on the transition of the first and second difference data Te, slime monitoring method characterized by having a step of determining the adhesion state of slime adhered to the second region is provided (claim 10).

  The first and second oxygen consumption data may be obtained using an oxidation-reduction potentiometer or a dissolved oxygen meter.

  Moreover, according to the other viewpoint of this invention, the 1st pH data regarding the pH of the water located in the 1st area | region in the tubular member into which water flows continuously, and the water located in the said 1st area | region First oxygen consumption level data relating to the dissolved oxygen concentration, and second pH data relating to the pH of water located in the second region within the tubular member, to which slime is more likely to adhere than the first region, A step of continuously obtaining second oxygen consumption level data relating to the dissolved oxygen concentration of water located in the second region, and a difference between the first pH data and the second pH data. Obtaining a first difference data, obtaining a second difference data which is a difference between the first oxygen consumption data and the second oxygen consumption data; and the first and second Based on the transition of the difference data of the second A step of determining the adhesion state of the slime adhered to the area, and a step of adding a slime remover to the water tank connected to the flowing water pipe for transporting the water based on the determination result of the adhesion state of the slime; A method for adding a slime remover is provided (claim 12).

  The first and second oxygen consumption data may be obtained using a redox potentiometer or a dissolved oxygen meter.

  According to the present invention, among the regions in the tubular member, the first pH data and the first oxygen consumption level data of water located in the first region, the region in the tubular member, The second pH data and the second oxygen consumption level data of water located in the second region where slime is more likely to adhere than the region are acquired, and the difference between the first pH data and the second pH data First difference data based on the first difference data, and second difference data based on the difference between the first oxygen consumption level data and the second oxygen consumption level data, and the first and second difference data By monitoring the transition of changes in the amount of slime, the first and second differential data change with an increase in the amount of slime attached. It can be grasped in real time.

It is a figure which shows typically schematic structure of the slime removal agent addition apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows typically schematic structure of the slime removal agent addition apparatus which concerns on the 2nd Embodiment of this invention. It is the figure which expanded the part enclosed by the area | region B among the slime remover addition apparatuses shown in FIG. It is the figure which expanded the part enclosed by the area | region C among the slime remover addition apparatuses shown in FIG. It is a figure which shows typically schematic structure of the slime removal agent addition apparatus which concerns on the modification of the 2nd Embodiment of this invention. 1 is a diagram schematically showing a schematic configuration of a test apparatus used in Test Example 1. FIG. The figure which shows the 1st difference data ((DELTA) pH) and 2nd difference data ((DELTA) ORP (mV)) of Example 1, and the differential pressure (Pa) of the test water which flows through the differential pressure measurement piping of a comparative example (graph) ). It is a figure (graph) which shows the relationship between the 1st and 2nd dissolved oxygen amount of Example 2, and the elapsed days from a test start. It is a figure (graph) which shows the relationship between the 3rd and 4th dissolved oxygen amount of an experiment example, and the elapsed days from a test start.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings. The drawings used in the following description are for explaining the configuration of the embodiment of the present invention. The size, thickness, dimensions, and the like of each part shown in the drawings are the actual slime monitoring device and slime removing agent addition device. It may be different from the dimensional relationship.

(First embodiment)
FIG. 1 is a diagram schematically showing a schematic configuration of a slime removing agent adding apparatus according to a first embodiment of the present invention. A shown in FIG. 1 indicates a moving direction of cooling water (water) flowing in the tubular member 26 (hereinafter referred to as “A direction”).

  Referring to FIG. 1, a slime remover adding device 10 according to a first embodiment includes a circulation water tank 11, which is a water tank, a cooling water supply line 13, a pump 14, a valve 15, and a cooling water recovery. It has a line 16, a slime remover tank 17, a slime remover supply line 19, an automatic valve 21, a slime monitoring device 23, and an analysis control device 24.

The circulation water tank 11 is connected to a first cooling water supply line 13-1 and a cooling water recovery line 16 which will be described later. The circulation water tank 11 is a tank for storing cooling water cooled by a cooling device (not shown).
The cooling water is guided to the first cooling water supply line 13-1 by the pump 14, and then passes through the slime monitoring device 23 and is cooled by the second cooling water supply line 13-2 (not shown). To contribute to the cooling of the object to be cooled. The cooling water after contributing to the cooling of the object to be cooled (not shown) is recovered in the circulation water tank 11 via the cooling water recovery line 16.

The cooling water supply line 13 includes a first cooling water supply line 13-1 and a second cooling water supply line 13-2.
One end of the first cooling water supply line 13-1 is connected to the circulation water tank 11, and the other end is an introduction portion 26-2 (one of components of a tubular member 26 to be described later). Connected with. The first cooling water supply line 13-1 is a line for supplying cooling water into the tubular member 26.

One end of the second cooling water supply line 13-2 is connected to a lead-out portion 26-3 (one of components of a tubular member 26 described later), and the other end is connected to a cooling water recovery line. 16 is connected.
The 2nd cooling water supply line 13-2 is a line for transporting the cooling water which passed through the slime monitoring apparatus 23 to a cooling target object (not shown).

  The pump 14 is provided in the first cooling water supply line 13-1. The valve 15 is provided in the first cooling water supply line 13-1 located between the introduction part 26-2 and the pump 14.

  One end of the cooling water recovery line 16 is connected to the other end of the second cooling water supply line 13-2, and the other end is connected to the circulation water tank 11. The cooling water recovery line 16 is a line for recovering the cooling water that has contributed to cooling the object to be cooled (not shown) in the circulation water tank 11.

The slime removing agent tank 17 is a tank in which a slime removing agent (antibacterial agent) for removing slime is stored. The slime remover tank 17 is connected to the circulation water tank 11 via a slime remover supply line 19.
As the slime remover, for example, chlorinated isothiazolone (Cl-MIT) can be used.

  One end of the slime remover supply line 19 is connected to the slime remover tank 17, and the other end is connected to the circulation water tank 11. The slime remover supply line 19 is a line for supplying the slime remover stored in the slime remover tank 17 to the cooling water in the circulation water tank 11.

The automatic valve 21 is provided in the slime remover supply line 19. The automatic valve 21 is electrically connected to the analysis control device 24. Thereby, the automatic valve 21 is controlled by the analysis control device 24.
When the automatic valve 21 is closed, the slime remover stored in the slime remover tank 17 is not supplied to the cooling water in the circulation water tank 11. On the other hand, when the automatic valve 21 is opened by the analysis control device 24, the slime remover stored in the slime remover tank 17 is added to the cooling water in the circulation water tank 11, and the slime remover is added. The cooled water is supplied to the first cooling water supply line 13-1.

  The slime monitoring device 23 includes a tubular member 26, a first lid member 28, a second lid member 29, a first annular member 32, a second annular member 33, and a first pH meter 35. The second pH meter 36, the first measuring device 38, the second measuring device 39, the storage unit 41, the calculating unit 42, the determining unit 45, and the display unit 46.

The tubular member 26 has both ends open, and includes a tubular member main body 26-1, an introduction portion 26-2, and a lead-out portion 26-3.
The tubular member body 26-1 is a tubular member extending in a predetermined direction, and cooling water continuously flows in the A direction through the inside.
The tubular member body 26-1 includes a first region 26A (a part of the region in the tubular member 26) disposed inside one end portion 26-1A and the other end portion 26-1B. 2nd area | region 26B (a part of area | region in the tubular member 26) arrange | positioned inside. As the shape of the tubular member main body 26-1, for example, a cylindrical shape can be used.

The introduction portion 26-2 has one end portion 26 of the tubular member main body 26-1 so that the cooling water supplied from the first cooling water supply line 13-1 can be introduced into the tubular member main body 26-1. -1A is provided on the outer wall (the tubular member body 26-1 corresponding to the first region 26A).
The introduction portion 26-2 protrudes from the outer wall of the tubular member main body 26-1 so as to be spaced outward. The introduction part 26-2 is orthogonal to the tubular member body 26-1.

  As described above, the first region 26A has the introduction portion 26-2 provided on the outer wall of the one end portion 26-1A of the tubular member body 26-1 and orthogonal to the tubular member body 26-1. It becomes possible to generate a turbulent flow of the cooling water. Thereby, it can suppress that slime adheres to 26 A of 1st area | regions.

The lead-out part 26-3 is connected to the other end of the tubular member main body 26-1 so that the cooling water that has flowed in the direction A in the tubular member main body 26-1 can be led to the second cooling water supply line 13-2. It is provided on the outer wall (the tubular member body 26-1 corresponding to the second region 26B) constituting the portion 26-1B.
The introduction portion 26-3 protrudes from the tubular member body 26-1 so as to be separated from the outside thereof. The introduction part 26-3 is orthogonal to the tubular member body 26-1.

  Thus, by providing the outer wall of the other end portion 26-1B of the tubular member body 26-1 and having the lead-out portion 26-3 orthogonal to the tubular member body 26-1, the end portion 26-1B In the second region 26B arranged on the inner side, stagnation of the cooling water can be generated. Thereby, it becomes possible to make slime adhere more easily to the 2nd field 26B than the 1st field 26A.

In addition, the introduction portion 26-2 is disposed on the outer wall of the one end portion 26-1A of the tubular member body 26-1, and the lead-out portion 26- is disposed on the outer wall of the other end portion 26-1B of the tubular member body 26-1. By arranging 3, the first area 26 </ b> A where the slime easily adheres and the second area 26 </ b> B where the slime hardly adheres can be sufficiently separated from each other.
This suppresses the influence of the phenomenon occurring in the first region 26A (specifically, the turbulent flow of the cooling water) and the phenomenon occurring in the second region 26B (stagnation of the cooling water). it can.

  The first lid member 28 is disposed so as to close one open end of the tubular member 26. The first lid member 28 has a pH electrode through hole (not shown) into which the electrode 35A of the first pH meter 35 is inserted, and a measuring instrument electrode into which the electrode 38A of the first measuring instrument 38 is inserted. And a through hole (not shown).

The second lid member 29 is disposed so as to close the other open end of the tubular member 26. Thus, the second lid member 29 is disposed so as to face the first lid member 28.
The second lid member 29 has a pH electrode through hole (not shown) into which the electrode 36A of the second pH meter 36 is inserted, and a measuring instrument electrode into which the electrode 39A of the second measuring instrument 39 is inserted. And a through hole (not shown).

The first annular member 32 is provided on the surface 28 a of the first lid member 28 that faces the second lid member 29. Accordingly, the first annular member 32 is disposed in the first region 26A and is immersed in the cooling water.
The first annular member 32 is disposed so as to surround the periphery of the electrode 35A of the first pH meter 35 and the electrode 38A of the first measuring device 38 disposed in the first region 26A.

As described above, the first annular member 32 surrounding the electrode 35A of the first pH meter 35 and the electrode 38A of the first measuring device 38 disposed in the first region 26A has the first Since the electrode 35A of the pH meter 35 and the electrode 38A of the first measuring device 38 (measuring device for measuring dissolved oxygen concentration of water) are less affected by the water flow, the first pH data and the first Oxygen consumption data can be acquired.
As a material of the first annular member 32, for example, vinyl chloride can be used.

  In addition, it may replace with the 1st annular member 32, and may reduce the influence of the water flow which the electrode 35A of the 1st pH meter 35 and the electrode 38A of the 1st measuring device 38 receive. .

The second annular member 33 is provided on the surface 29 a of the second lid member 29 that faces the first lid member 28. Accordingly, the second annular member 33 is disposed in the second region 26B and is immersed in the cooling water.
The second annular member 33 is disposed so as to surround the electrode 36A of the second pH meter 36 and the electrode 39A of the second measuring device 39 disposed in the second region 26B.

  Thus, by having the second annular member 33 surrounding the electrode 36A of the second pH meter 36 and the electrode 39A of the second measuring device 39 disposed in the second region 26B, Since the electrode 36A of the pH meter 36 and the electrode 39A of the second measuring device 39 (measuring device for measuring the dissolved oxygen concentration of water) are not easily affected by the water flow, the highly accurate second pH data and second Oxygen consumption data can be acquired.

As the second annular member 33, for example, a member having the same material and shape as the first annular member 32 can be used.
In addition, it may replace with the 2nd annular member 33, and may reduce the influence of the water flow which the electrode 36A of the 2nd pH meter 36 and the electrode 39A of the 2nd measuring device 39 receive by providing another member. .

The first pH meter 35 is electrically connected to the analysis control device 24. The first pH meter 35 includes an electrode 35 </ b> A penetrating the first lid member 28 and having a tip portion surrounded by the first annular member 32.
The first pH meter 35 acquires the first pH data by continuously measuring the pH of the cooling water located in the first region 26A where the slime hardly adheres. The first pH meter 35 transmits the acquired first pH data to the analysis control device 24 (specifically, the calculation unit 42).

The second pH meter 36 is electrically connected to the analysis control device 24. The second pH meter 36 has an electrode 36 </ b> A that penetrates the second lid member 29 and has a tip portion surrounded by the second annular member 33.
The second pH meter 36 acquires the second pH data by continuously measuring the pH of the cooling water located in the second region 26B where the slime is likely to adhere. The second pH meter 36 transmits the acquired second pH data to the analysis control device 24 (specifically, the calculation unit 42).

The first measuring instrument 38 is electrically connected to the analysis control device 24. The first measuring instrument 38 includes an electrode 38 </ b> A that penetrates the first lid member 28 and has a tip portion surrounded by the first annular member 32.
The first measuring device 38 acquires the first oxygen consumption data by continuously measuring the change in the dissolved oxygen concentration of the cooling water located in the first region 26A. The first measuring device 38 transmits the acquired first oxygen consumption data to the analysis control device 24 (specifically, the calculation unit 42).

The second measuring device 39 is electrically connected to the analysis control device 24. The second measuring instrument 39 includes an electrode 39 </ b> A that penetrates the second lid member 29 and has a tip portion surrounded by the second annular member 33.
The second measuring device 39 acquires the second oxygen consumption data by continuously measuring the change in the dissolved oxygen concentration of the cooling water located in the second region 26B where the slime tends to adhere. The second measuring device 39 transmits the acquired second oxygen consumption level data to the analysis control device 24 (specifically, the calculation unit 42).

As the first and second measuring instruments 38 and 39, for example, an oxidation-reduction potential (ORP) meter or a dissolved oxygen meter can be used.
From the viewpoint of electrode maintainability, the first and second measuring devices 38 and 39 are preferably redox potential (ORP) meters.

  By the way, when the oxidation-reduction potentiometer is used as the first and second measuring devices 38, 39, the oxidation-reduction potential E is expressed by the Nernst equation shown in the following equation (1). When the potential E is expressed in units of mV, the following equation (2) is used.

E = E ₀ − (RT / nF) × ln (A ₀ / Ar) (1)
E = E ₀ − (59 / n) × Log (A ₀ / Ar) (2)
However, in the above formulas (1) and (2), E ₀ is a reference potential at the same activity, A ₀ is an oxidant activity, Ar is a reducing agent activity, RT / nF is a Nernst coefficient, and R is The Boltzmann constant, T is the absolute temperature, n is the number of electrons, and F is the Faraday constant.
From the above equation (2), it can be seen that when the pH is increased by 1, the oxidation-reduction potential E decreases by 59 mV.

The storage unit 41 is one of the components of the analysis control device 24, and is electrically connected to the calculation unit 42, the determination unit 45, and the control unit 47.
In the storage unit 41, a program for implementing the slime monitoring method and the slime removing agent addition method of the first embodiment to be described later, and the determining unit 45 adds the slime removing agent to the cooling water in the circulation water tank 11. A plurality of threshold values for determining whether or not to add, and determining the addition amount of the slime removing agent are stored in advance.

The calculation unit 42 is one of the components of the analysis control device 24, and includes first and second pH meters 35 and 36, first and second measuring instruments 38 and 39, a display unit 46, and a determination unit. 45 and the control unit 47 are electrically connected.
Thereby, the calculating part 42 is the 1st pH data obtained by the 1st pH meter 35, the 2nd pH meter 36, the 1st measuring device 38, and the 2nd measuring device 39, 2nd pH. Data, first oxygen consumption data, and second oxygen consumption data are received.

The calculation unit 42 obtains the first difference data by continuously calculating the difference between the first pH data and the second pH data, and also calculates the first oxygen consumption data and the second oxygen. The second difference data is obtained by continuously calculating the difference with the consumption level data.
The calculation unit 42 transmits the calculated first and second difference data to the determination unit 45 and the display unit 46.

The determination unit 45 is one of the components of the analysis control device 24, and is electrically connected to the calculation unit 42, the display unit 46, and the control unit 47.
The determination unit 45 determines the state of slime adhesion to the second annular member 33 based on the change in the first and second difference data transmitted from the calculation unit 42 and the plurality of threshold values stored in the storage unit 41. In addition to the determination, a determination is made to determine whether or not to add the slime remover to the cooling water in the circulation water tank 11 and the amount of the slime remover added. The determination result of the determination unit 45 is transmitted to the control unit 47 as a determination signal.

By the way, when the slime adheres to the second region 26B, the pH of the lower layer portion of the slime decreases due to the generation of organic acid or the like due to biological metabolism.
On the other hand, the degree of oxygen consumption (oxidation-reduction potential) of the cooling water located in the second region 26B tends to increase with a decrease in pH. Since the part becomes a reducing atmosphere, it antagonizes the downward trend.

  Therefore, the first difference data obtained by continuously calculating the difference between the first pH data measured by the first pH meter 35 and the second pH data measured by the second pH meter 36. , And a second difference obtained by continuously calculating the difference between the first oxygen consumption data measured by the first measuring device 38 and the second oxygen consumption data measured by the second measuring device 39. By monitoring the change in the difference data, it is possible to easily determine the state of slime adhesion to the second annular member 33.

  Specifically, for example, when the transition of the first difference data is decreasing and the transition of the second difference data is increasing, the slime adhesion to the second region 26B is in the initial state. Yes, it can be judged that the generation of organic acid by biological activity is sensed.

  On the other hand, when the value of the first difference data is declining and the value of the second difference data is declining, it can be determined that the attachment of slime to the second region 26B has progressed considerably. . Also in this case, inside the slime. It can be judged that oxygen has been depleted by the slime respiration and the atmosphere has been reduced.

  Such a phenomenon is a phenomenon that can occur because slime is an aggregate of microorganisms, and it cannot occur if the deposit on the second region 26B is a non-living soil or is biological but has low activity. It is a phenomenon.

The display unit 46 is one of the components of the analysis control device 24, and is electrically connected to the calculation unit 42, the display unit 46, and the control unit 47. The display unit 46 displays the first difference data, the second difference data, and the determination result of the determination unit 45.
As the display unit 46, for example, a liquid crystal display, an organic EL (Electro-Luminescence) display, or the like can be used.

  Thus, by having the display part 26 which displays the 1st difference data, 2nd difference data, and the determination result of the determination part 45, the operator of the slime removal agent addition apparatus 10 is 2nd area | region 26B. It is possible to easily recognize the state of slime adhesion to the water, the amount of slime remover added to the cooling water in the circulation water tank 11, and the like.

According to the slime monitoring device 23 of the first embodiment having the above-described configuration, the electrode 35A of the first pH meter 35 and the first measuring device 38 disposed in the first region 26A where slime is difficult to adhere. The electrode 36A of the second pH meter 36 and the electrode 39A of the second measuring device 39 disposed in the second region 26B to which slime adheres more easily than the first region 26A, First difference data obtained by continuously calculating the difference between the first pH data measured by the pH meter 35 and the second pH data measured by the second pH meter 36, and the first measurement Calculation for obtaining second difference data obtained by continuously calculating the difference between the first oxygen consumption level data measured by the device 38 and the second oxygen consumption level data measured by the second measuring device 39 Unit 42 and first and second difference data And a determination unit 45 that determines the state of slime adhesion to the second region 26B based on the change in the second region 26B, thereby changing the amount of slime adhesion to the second region 26B. The first and second difference data (data relating to metabolism and respiratory activity due to the adhesion of slime) can be continuously monitored in real time.
Thereby, the continuous change of the adhesion state of the slime with respect to the 2nd area | region 26B can be grasped | ascertained correctly in real time.

  In addition, in FIG. 1, although the case where it had the 1st annular members 32 and 33 was mentioned as an example, the 1st annular members 32 and 33 should just be provided as needed.

The analysis control device 24 is electrically connected to the pump 14, the valve 15, the automatic valve 21, the first pH meter 35, the second pH meter 36, the first measuring device 38, and the second measuring device 39. ing. The analysis control device 24 performs overall control of the slime remover addition device 10.
The analysis control device 24 circulates by adjusting the opening and closing of the automatic valve 21 and the opening degree based on the determination signal transmitted from the determination unit 45 and the plurality of threshold values stored in the storage unit 41. The supply amount of the slime removing agent supplied to the cooling water in the water tank 11 is adjusted.
As the analysis control device 24, for example, a computer can be used. For example, a data logger may be used as a device having the storage unit 41, the calculation unit 42, the determination unit 45, and the display unit 46.

According to the slime remover adding device 10 of the first embodiment, the slime remover adding device 10, the slime remover tank 17 in which the slime remover is stored, the circulation water tank 11 and the slime remover tank. 17 is connected to the slime removing agent supply line 19, the automatic valve 21 provided in the slime removing agent supply line 19, and controlled by the control unit 47, and the cooling water is transported based on the determination result of the determination unit 45. By having a control unit 47 for controlling whether or not to add a slime remover in the circulating water tank 11 connected to the cooling water supply line 13 (running water piping), slime for the second region 26B It is possible to adjust the opening and closing of the automatic valve 21 and the opening degree according to the adhesion situation.
As a result, the water quality of the cooling water can be automatically controlled, and an amount of slime remover can be added according to the state of slime adhesion at the time when the addition of the slime remover is necessary.

  Next, with reference to FIG. 1, the slime remover addition method (method including the slime monitoring method) of the first embodiment using the slime remover addition apparatus 10 shown in FIG. 1 will be described.

  First, whether or not the determination unit 45 adds the slime remover to the cooling water in the circulation water tank 11 and the addition amount of the slime removal agent added to the cooling water in the circulation water tank 11 in the storage unit 41 in advance. A plurality of threshold values for determining the slime removal agent are stored, a sufficient amount of the slime removal agent is prepared in the slime removal agent tank 17, and the slime removal agent adding device 10 is operated. Thereby, the cooling water continuously flows in the A direction in the tubular member main body 26-1.

Next, using the first pH meter 35, the second pH meter 36, the first measuring device 38, and the second measuring device 39, the first pH related to the pH of the cooling water located in the first region 26A. pH data, first oxygen consumption data regarding dissolved oxygen concentration of cooling water located in the first region 26A, and second in the tubular member 26 where slime is more likely to adhere than in the first region 26A. The second pH data relating to the pH of the water located in the region 26B and the second oxygen consumption level data relating to the dissolved oxygen concentration of the water located in the second region 26B are simultaneously and continuously acquired.
At this time, the first and second oxygen consumption data are acquired using an oxidation-reduction potentiometer or a dissolved oxygen meter. The acquired four data are transmitted to the calculation unit 42 in real time.

Next, the calculation unit 42 continuously calculates the difference between the first pH data and the second pH data, whereby the first difference data is obtained, and the first oxygen consumption level data and the second pH data are calculated. The second difference data is obtained by continuously calculating the difference from the oxygen depletion degree data.
The calculation unit 42 always calculates the first and second difference data during operation of the slime remover adding device 10.
The calculation unit 42 transmits the first and second difference data to the determination unit 45 and the display unit 46 in real time. The display unit 46 displays the first and second difference data as a graph and a numerical value.

  Next, the determination unit 45 determines the slime adhesion state with respect to the second region 26B based on the change in the first and second difference data and the plurality of threshold values stored in the storage unit 41. A determination is made to determine whether or not to add the slime remover to the cooling water in the circulation water tank 11 and the amount of the slime remover added. The determination result of the determination unit 45 is transmitted to the control unit 47 as a determination signal.

  According to the slime monitoring method of the first embodiment, the first pH data and the first oxygen consumption data of the water located in the first region 26A in the tubular member 26, and the region in the tubular member 26. The second pH data and the second oxygen consumption level data of the water located in the second region 26B where the slime is more likely to adhere than the first region 26A are acquired, and the first pH data is obtained. First difference data based on the difference between the first and second pH data, and second difference data based on the difference between the first oxygen consumption level data and the second oxygen consumption level data are calculated. By monitoring the change in the first and second difference data, a change occurs in the transition of the first and second difference data as the amount of slime attached increases, so that the slime for the second region 26B is changed. Accurate continuous changes in the adhesion status It can be grasped in real time.

Next, the slime remover is added to the circulation water tank 11 by controlling the automatic valve 21 by the control unit 47 based on the determination result of the slime adhesion state.
Thereby, slime is removed from the inside of the cooling water supply line 13, the inside of the cooling water recovery line 16, and the inside of the tubular member 26, and the cleanliness of the cooling water can be maintained.

According to the slime remover addition method of the first embodiment, the determination unit 45 determines the second difference data and the plurality of threshold values stored in the storage unit 41 based on the second difference data. The state of slime adhesion to the region 26B is determined, and the opening / closing and opening of the automatic valve 21 are adjusted by the control unit 47 based on the determination result.
For this reason, the quality control of the cooling water can be performed automatically, and the slime remover can be added in an amount corresponding to the state of slime adhesion at the timing when the slime remover needs to be added.

(Second Embodiment)
FIG. 2 is a diagram schematically showing a schematic configuration of a slime removing agent adding apparatus according to the second embodiment of the present invention. In FIG. 2, the same components as those of the slime removing agent adding apparatus 10 of the first embodiment shown in FIG.
FIG. 3 is an enlarged view of a portion surrounded by region B in the slime remover addition device shown in FIG. FIG. 4 is an enlarged view of a portion surrounded by region C in the slime removing agent adding apparatus shown in FIG.

  2 to 4, the slime removing agent adding device 60 according to the second embodiment is replaced with the slime monitoring device 23 constituting the slime removing agent adding device 10 of the first embodiment. Except having the slime monitoring device 61, it is comprised similarly to the slime removal agent addition apparatus 10. FIG.

  The slime monitoring device 61 is configured in the same manner as the slime monitoring device 23 except that it further includes a slime adhesion member 64 in addition to the configuration of the slime monitoring device 23 shown in FIG.

The slime adhesion member 64 is disposed so as to cover the electrode 36A of the second pH meter 36 and the electrode 39A of the second measuring device 39 disposed in the second region 26B. The slime adhesion member 64 is a member through which cooling water (water) can be circulated and slime easily adheres.
As the slime adhering member 64, for example, in the initial stage of use, it is possible to circulate cooling water in the direction from the surface of the slime adhering member 64 toward the electrodes 36A and 39A. It is preferable that the water flowability in the direction from the surface of the member 64 toward the electrodes 36A and 39A is deteriorated.

  As the slime adhesion member 64, for example, a mesh-like member made of resin, metal, paper, or the like can be used. Considering the durability and moldability of the slime adhesion member 64, for example, a resin mesh member may be used as the slime adhesion member 64.

The resin mesh member is preferably a non-woven fabric made of polyolefin (for example, polyethylene or polypropylene) in consideration of economy, durability, and moldability.
Further, (an indicator of the nonwoven eyes roughness, fiber weight per unit area) basis weight of the nonwoven fabric as is preferably in the range of 5 to 20 g / ^{m 2,} more in the range of 10 to 15 g / ^{m 2} preferable.
If the basis weight is smaller than the above range (in other words, the surface is rough), the slime is difficult to adhere to the surface of the resin mesh member. Further, if the basis weight is larger than the above range (in other words, the eyes are fine), it becomes difficult to circulate water before and after the mesh member made of resin, so that data cannot be measured.

  When a nonwoven fabric is used as the slime adhesion member 64, for example, the attachment of the slime adhesion member 64 to the electrodes 36A, 39A is performed by wrapping the electrodes 36A, 39A with the slime adhesion member 64, and then an O-ring (FIGS. 2 and 4). Can be used to fix the slime adhesion member 64 to the electrodes 36A and 39A.

According to the slime monitoring device 61 of the second embodiment, water is covered so as to cover the electrode 36A of the second pH meter 36 and the electrode 39A of the second measuring device 39 arranged in the second region 26B. By having the slime adhering member 64 that can circulate and easily adhere to the slime, the second region 26B (specifically, the electrodes 36A and 39A of the electrodes 36A and 39A) can be compared with the second region 26B shown in FIG. It is possible to make slime easily adhere to the vicinity.
Thereby, since the change of 1st and 2nd difference data becomes large, the adhesion state of slime can be detected more correctly.

According to the slime removing agent adding device 60 of the second embodiment having the slime monitoring device 61, it is possible to detect the adhesion state of the slime earlier and add the slime removing agent into the circulation water tank 11. Therefore, the cleanliness of the cooling water flowing in the cooling water supply line 13, the cooling water recovery line 16, and the tubular member 26 can be further increased.
Moreover, the slime remover addition apparatus 60 of the second embodiment can obtain the same effects as the slime remover addition apparatus 10 of the first embodiment.

  The slime remover addition method of the second embodiment using the slime remover addition device 60 can be performed by the same method as the slime remover addition method of the first embodiment.

  FIG. 5 is a diagram schematically showing a schematic configuration of a slime remover adding device according to a modification of the second embodiment of the present invention. In FIG. 5, the same components as those of the slime removing agent adding apparatus 60 of the second embodiment shown in FIG.

Referring to FIG. 5, a slime remover adding device 65 according to a modification of the second embodiment is replaced with a slime monitoring device 61 constituting the slime remover adding device 60 of the second embodiment. Except having the monitoring device 66, it is comprised similarly to the slime removal agent addition apparatus 60. FIG.
The slime monitoring device 66 is configured similarly to the slime monitoring device 61 described in the second embodiment except that the first and second annular members 32 and 33 shown in FIG. .

That is, the slime remover adding device 65 of the modification of the second embodiment excludes the first and second annular members 32 and 33 from the components of the slime remover adding device 60 of the second embodiment. It has been configured.
Also in the slime removing agent adding device 65 of the modification of the second embodiment having such a configuration, the same effect as that of the slime removing agent adding device 60 of the second embodiment can be obtained.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

(Test Example 1)
<Configuration of test equipment>
FIG. 6 is a diagram schematically illustrating a schematic configuration of a test apparatus used in Test Example 1. In FIG. 6, the same components as those in the slime removing agent adding apparatus 10 shown in FIG.

  In Test Example 1, a water flow test for 24 days was performed using the test apparatus 70 shown in FIG. 6, and the differential pressure of the test water flowing through the differential pressure measurement pipe 77 (the slime monitoring apparatus of the comparative example was attached to the slime). Data used when detecting the situation) and first and second difference data (data used when the slime monitoring device 23 of Example 1 detects the adhesion state of the slime).

Here, the configuration of the test apparatus 70 will be described with reference to FIG.
The test apparatus 70 includes, in addition to the configuration of the slime removing agent adding apparatus 10 according to the first embodiment, an air supply source 71, a diffuser pipe 72, a flow meter 75, a differential pressure measurement pipe 77, and a differential pressure gauge. 78, except that it has the same as the slime remover adding device 10.

The air supply source 71 was connected to one end of the air diffusing tube 72 in a state where air could be supplied to the air diffusing tube 72. The diffuser pipe 72 has a plurality of through holes 72A on the other end side, and a portion of the diffuser pipe 72 in which the plurality of through holes 72A are formed is immersed in test water stored in the circulation water tank 11. It was.
Thereby, when air is supplied from the air supply source 71, the air is supplied as bubbles to the test water in the circulating water tank 11 through the plurality of through holes 72A.

The flow meter 75 was provided in the 1st cooling water supply line 13-1 located between the valve | bulb 15 and the introducing | transducing part 26-2. As the differential pressure measuring pipe 77, a stainless steel pipe having an inner diameter of 16 mm was used.
The differential pressure gauge 78 was installed so that the differential pressure of the test water flowing through the differential pressure measurement pipe 77 could be measured. The interval between the differential pressure measuring parts measured by the differential pressure gauge 78 was 80 cm.

As the tubular member 26, an acrylic column having an inner diameter of 40 mm was used. As the introduction part 26-2 and the lead-out part 26-3, an acrylic joint having an inner diameter of 15 mm was used.
As the first and second annular members 32 and 33, vinyl chloride annular members having an inner diameter of φ25 mm were used.

As the first and second pH meters 35 and 36, HM-30P manufactured by Toa DKK Corporation was used. As the first and second measuring instruments 38 and 39, RM-30P, which is an oxidation-reduction potentiometer manufactured by Toa DK Corporation, was used.
The total amount of test water held by the test apparatus 70 was 55 L. As the slime remover, chlorinated isothiazolone (Cl-MIT) was used.

<Production of test water>
In order to accelerate the adhesion of slime after erasing residual chlorine in the town water by passing the town water of Shimotsuga-gun, Tochigi Prefecture through an activated carbon column, 20 mg / L glucose (Glucose), 10 mg / L ammonium chloride (NH ₄ Cl), 5 mg / L H ₃ PO ₄ was added as a substrate.
Next, the town water to which the substrate was added was sufficiently stirred, and after confirming that the substrate was dissolved in the town water, sodium hydroxide was added to prepare test water having a pH of 8.5.

<Test water flow conditions>
In order to reproduce the flow fluctuation of the water in the actual water system, the flow rate of the test water supplied to the tubular member 26 was changed within the range of 4.0 to 8.0 L / min by controlling the valve 17.
Specifically, 6.0 L / min from the test start date to the 6th day, 8.0 L / min from the 7th day to the 12th day, 4.0 L / min from the 13th day to the 18th day, From the 19th day to the 24th day, it was 6.0 L / min.

When the flow rate of the test water supplied to the tubular member 26 is 6.0 L / min, the flow rate of the test water flowing in the differential pressure measurement pipe 77 is 50 cm / sec, and the test flowing in the tubular member body 26-1 The water flow rate was 8 cm / sec.
The temperature of the test water was not particularly controlled, but the temperature of the test water during the test period (24 days) was in the range of 25-30 ° C.
In order to keep the test water aerobic, the test water in the circulation water tank 11 was bubbled by supplying 1 L / min of air to the air diffuser 72 from the air supply source 71.

<Addition of slime remover>
On the 21st day from the start of the test, 20 mg / L of chlorinated isothiazolone (Cl-MIT) was introduced into the circulating water tank 11 with respect to the amount of retained water (55 L).

<Calculation of first and second differential data and differential pressure>
Using the above water flow conditions, the test water is passed for 24 days, the first pH data, the second pH data, the first oxygen consumption data, the second oxygen consumption data, and the differential pressure measurement. The first differential data (ΔpH shown in FIG. 7), which is the difference between the first pH data and the second pH data, The second difference data (ΔORP shown in FIG. 7), which is the difference data between the oxygen consumption level data and the second oxygen consumption level data, was continuously obtained.

FIG. 7 shows the first differential data (ΔpH) and second differential data (ΔORP (mV)) of Example 1 and the differential pressure (Pa) of test water flowing through the differential pressure measurement pipe of the comparative example. The plotted graph is shown.
In FIG. 7, the second pH data and the second oxygen located in the second area 26 </ b> B are based on the first pH data and the first oxygen consumption data of the test water located in the first area 26 </ b> A. Depletion data was plotted as ΔpH and ΔORP.
The pH of the test water after completion of the water flow test was 8.2. The ORP at the start of the test was 79 mV, and the ORP after the test was 86 mV.

<Summary of first and second differential data and differential pressure measurement results>
Referring to FIG. 7, it was confirmed that ΔpH gradually decreased from about the 4th day in the period from the test start date to the 6th day. It was also confirmed that ΔORP gradually increased from the fourth day. The change amount of ΔORP at this time corresponds to the change amount of ΔpH.

Such a change is a change that occurs in the initial stage of slime deposition. That is, it is thought that the pH fall by generation | occurrence | production of the organic acid by microbial activity is caught.
In the slime monitoring method using the differential pressure, which is a comparative example, the change in the differential pressure of the test water flowing through the differential pressure measurement pipe 77 is very small, and the initial stage of slime adhesion could not be captured.
On the other hand, in the slime monitoring method using the first and second difference data (ΔpH and ΔORP) which is Example 1, the tendency of slime adhesion is captured due to a decrease in pH. It was unclear whether the slime adhesion tendency was captured.

In the period from the seventh day to the twelfth day, an increase in slime was visually confirmed in the vicinity of the derivation unit 26-3 (second region 26B). A decrease in ΔpH was subsequently confirmed.
On the other hand, it was confirmed that the increase of ΔORP temporarily stopped and decreased after the seventh day.
Such a change is presumed to be because the lower part of the slime has changed to a reducing atmosphere as a result of the consumption of oxygen by respiration, which is a microbial activity, as the thickness of the slime increases.

Regarding the differential pressure, when the flow rate of the test water is faster (specifically, 8.0 L / min) than the flow rate of the test water (6.0 L / min) during the period from the test start date to the sixth day. After that, it rose significantly, and after that, it showed a gradual upward trend.
At this stage, the same flow rate of the test water as in the period from the test start date to the 6th day (in other words, if the test water flow rate from the test start to the 12th day is the same), the second It is presumed that the slime adhesion state on the region 26B has been detected.

  It was confirmed that ΔpH was further decreased during the period from the 13th day to the 18th day. Moreover, it has confirmed that (DELTA) ORP was also in the fall tendency. Visually, it was confirmed that the slime further increased in the vicinity of the lead-out part 26-3 due to the active adhesion and proliferation of the slime.

  Regarding the differential pressure, when the flow rate of the test water is slower (specifically, 4.0 L / min) than the flow rate of the test water during the period from the 7th day to the 12th day (8.0 L / min). After that, it declined significantly, and then became a slight upward trend. From the results of the period from the 7th day to the 18th day, it was confirmed that when the flow rate of the test water was decreased, the slime detection sensitivity was significantly reduced.

In the period from the 19th day to the 21st day, it was visually confirmed that the inside of the lead-out part 26-3 was covered with slime.
Therefore, on the 21st, chlorinated isothiazolone (Cl-MIT) was added to the test water in the circulation water tank 11, and the test apparatus 70 was operated until the 24th day.

As a result, it was observed that the slime in the lead-out part 26-3 was gradually peeled off, and after several hours from the addition of chlorinated isothiazolone (Cl-MIT), all the slime in the lead-out part 26-3 was removed. The turbidity of the test water was confirmed by the peeled slime.
ΔpH and ΔORP at this stage were close to ΔpH and ΔORP immediately after the start of the test.
From this, by using the slime monitoring method of Example 1 using the first and second difference data (ΔpH and ΔORP), it can be confirmed that the peeling of the slime after adding the slime remover can be detected. It was.

  Regarding the differential pressure, when the flow rate of the test water is higher than the flow rate of the test water (4.0 L / min) during the period from the 13th day to the 18th day (specifically, 6.0 L / min). Although it rose gradually, it returned to 0 which was the initial value at the start of the test.

In the conventional method of monitoring the amount of slime adhesion using only the differential pressure (comparative example), the amount of slime adhesion, proliferation, and separation can be detected when the condition of the flow rate of water is constant.
However, when the flow rate of water changes, the differential pressure changes greatly. For this reason, even if only the differential pressure is monitored, it is impossible to accurately grasp the state of slime adhesion.
In this method, when the flow rate of the test water is low, the detection sensitivity is greatly reduced.

  On the other hand, according to the slime monitoring method of Example 1 which detects the adhesion state of slime based on the first and second difference data, it depends on the flow rate of the test water, the change in the pH of the test water flowing through the entire apparatus, and the like. Thus, it was confirmed that the initial change in which the slime adhered, the change in the stage in which the thickness of the slime increased, the change in the stage in which the slime was peeled off by the slime remover, and the like can be detected with high sensitivity.

  In addition, it replaces with RM-30P which is the oxidation-reduction potentiometer made by Toa DK, and uses DO-31P which is the dissolved oxygen meter made by Toa DK as the first and second measuring devices 38 and 39. A similar water flow test was conducted and similar results were obtained.

(Test Example 2)
In Test Example 2, two tests of Example 2 and Experimental Example were performed.
In Example 2, the first dissolved oxygen, which is the dissolved oxygen amount of the test water located in the first region 26A, is obtained by performing a water flow test using the slime remover adding device 65 shown in FIG. 5 for 6 days. The amount and the second dissolved oxygen amount which is the dissolved oxygen amount of the test water located in the second region 26B were measured.

In the experimental example, the water passing test is performed for 6 days with the slime adhering member 64 removed from the slime removing agent adding device 65 shown in FIG. The third dissolved oxygen amount and the fourth dissolved oxygen amount, which is the dissolved oxygen amount of the test water located in the second region 26B, were obtained.
Moreover, at the time of the water flow test of Example 2 and an experiment example, the test water in the circulation water tank 11 was bubbled using the air supply source 71 and the diffuser pipe 72 shown in FIG. At this time, air was supplied from the air supply source 71 to the diffuser pipe 72 at a supply rate of 1 L / min.

As the tubular member 26, an acrylic column having an inner diameter of 40 mm was used. As the introduction part 26-2 and the lead-out part 26-3, an acrylic transparent pipe having an outer diameter of 30 mm, an inner diameter of 25 mm, and a length of 30 cm was used.
As the first and second measuring instruments 38 and 39, the oxidation-reduction potentiometer used in Test Example 1 was used. Moreover, the holding | maintenance amount of the test water of the whole apparatus was 20L.

<Production of test water>
As the test water, a pH 8.5 test solution prepared by the same method as described in Test Example 1 was used.

<Test water flow conditions>
In order to reproduce the flow fluctuation of water in the actual water system, the flow rate of test water supplied to the tubular member 26 was set to 3.0 L / min by controlling the valve 17. The temperature of the test water was controlled to be 30 ° C.

<The slime adhesion member and mounting method used in Example 2>
As the slime adhesion member 64, a nonwoven fabric manufactured by Unitika Co., Ltd. (model number; S0153WDO, basis weight is 15 g / cm ² ) was used. The nonwoven fabric was disposed so as to enclose the electrode 39A, and then fixed to the electrode 39A using an O-ring (not shown in FIG. 5).

<About the 1st and 2nd dissolved oxygen amount of Example 2, and the 3rd and 4th dissolved oxygen amount of an experiment example>
In FIG. 8, the relationship between the 1st and 2nd dissolved oxygen amount of Example 2 and the elapsed days from the start of a test is shown. FIG. 9 shows the relationship between the third and fourth dissolved oxygen amounts in the experimental example and the number of days elapsed from the start of the test.
In Example 2, it can be visually confirmed that the slime is rapidly attached to the surface of the nonwoven fabric, and along with this, as shown in FIG. 8, it is confirmed that the second dissolved oxygen amount decreases rapidly. did it.

On the other hand, in the experimental example, it was confirmed that slime gradually adhered to the second region 26B as the water flow test started. In the first region 26A, it was confirmed that slime was slightly attached on the sixth day from the start of the test.
As shown in FIG. 9, in the experimental example, it was confirmed that the fourth dissolved oxygen amount decreased more slowly than the second dissolved oxygen amount shown in FIG. 8.

  From the above results, when the slime adhesion member 64 is installed on the electrode 39A of the second measuring device 39 (in this case, the oxidation-reduction potentiometer) arranged in the second region 26B where the slime is likely to adhere, the slime adhesion state It has been confirmed that can be detected quickly and remarkably.

  DESCRIPTION OF SYMBOLS 10,60,65 ... Slime remover addition apparatus, 11 ... Circulating water tank, 13 ... Cooling water supply line, 13-1 ... 1st cooling water supply line, 13-2 ... 2nd cooling water supply line, 14 DESCRIPTION OF SYMBOLS ... Pump, 15 ... Valve, 16 ... Cooling water recovery line, 17 ... Slime removal agent tank, 19 ... Slime removal agent supply line, 21 ... Automatic valve, 23, 61, 66 ... Slime monitoring device, 24 ... Analysis control device 26 ... Tubular member, 26A, 26B ... first region, 26-1 ... Tubular member body, 26-1A, 26-1B ... end, 26-2 ... introduction part, 26-3 ... lead-out part, 28 ... First lid member, 28a, 29a ... surface, 29 ... second lid member, 32 ... first annular member, 33 ... second annular member, 35 ... first pH meter, 35A, 36A, 38A, 39A ... electrode, 36 ... second pH meter DESCRIPTION OF SYMBOLS 38 ... 1st measuring device, 39 ... 2nd measuring device, 41 ... Memory | storage part, 42 ... Operation part, 45 ... Determination part, 46 ... Display part, 47 ... Control part, 64 ... Member for slime adhesion, 70 ... Test device, 71 ... Air supply source, 72 ... Air diffuser, 72A ... Through hole, 75 ... Flow meter, 77 ... Piping for differential pressure measurement, 78 ... Differential pressure gauge, A ... Direction, B, C ... Area

Claims (13)

A tubular member having an introduction part into which water is introduced and a lead-out part from which the water is led out, and wherein the water flows continuously;
Of the regions in the tubular member, an electrode is disposed in a first region, and the first pH data is obtained by continuously measuring the pH of water located in the first region. a pH meter;
A first measuring device that obtains first oxygen consumption data by continuously measuring changes in the dissolved oxygen concentration of water located in the first region, wherein electrodes are arranged in the first region. When,
An electrode is disposed in a second region where slime is more likely to adhere than the first region in the region in the tubular member, and the pH of water located in the second region is continuously measured. A second pH meter for acquiring second pH data;
A second measuring device that has an electrode disposed in the second region, and obtains second oxygen consumption data by continuously measuring a change in dissolved oxygen concentration of water located in the second region. When,
The first difference data is obtained by continuously calculating the difference between the first pH data and the second pH data, and the first oxygen consumption data and the second oxygen consumption are obtained. A calculation unit that obtains second difference data by continuously calculating the difference with the degree data;
Based on the first and second difference data, a determination unit that determines the adhesion state of the slime adhered to the second region;
A slime monitoring device comprising: The tubular member has a tubular member body,
The introduction portion is disposed so as to be orthogonal to the tubular member body corresponding to the first region,
The slime monitoring device according to claim 1, wherein the lead-out portion is disposed so as to be orthogonal to the tubular member body corresponding to the second region.   The slime monitoring according to claim 2, wherein the first region is disposed at one end of the tubular member body and the second region is disposed at the other end of the tubular member body. apparatus. A first annular member disposed in the first region and surrounding the electrode of the first pH meter and the electrode of the first measuring instrument;
A second annular member disposed in the second region and surrounding the electrode of the second pH meter and the electrode of the second measuring instrument;
The slime monitoring device according to any one of claims 1 to 3, wherein the slime monitoring device is provided.   The slime monitoring device according to any one of claims 1 to 4, wherein the first and second measuring devices are an oxidation-reduction potentiometer or a dissolved oxygen meter.   A member for slime adhesion that allows the water to flow and the slime easily adheres so as to cover the electrode of the second pH meter and the electrode of the second measuring instrument arranged in the second region. The slime monitoring device according to any one of claims 1 to 5, wherein the slime monitoring device is provided.   The slime monitoring apparatus according to claim 6, wherein the slime adhesion member is a mesh member.   The slime monitoring device according to any one of claims 1 to 7, further comprising a display unit that displays the first difference data, the second difference data, and a determination result of the determination unit. . The slime monitoring device according to any one of claims 1 to 8,
A slime remover tank in which the slime remover is stored;
Based on the determination result of the determination unit, a control unit that controls whether or not to add the slime remover in a water tank connected to a flowing water pipe that transports the water;
An apparatus for adding a slime remover. First pH data relating to the pH of water located in a first region within the tubular member through which water flows continuously, and first oxygen consumption data relating to the dissolved oxygen concentration of water located in the first region; The second pH data relating to the pH of the water located in the second region within the tubular member, to which slime adheres more easily than the first region, and the dissolution of the water located in the second region Continuously obtaining second oxygen consumption data relating to oxygen concentration;
The first difference data, which is the difference between the first pH data and the second pH data, is continuously acquired, and the first oxygen consumption level data and the second oxygen consumption level data are obtained. Continuously acquiring second difference data as a difference;
A step of determining an adhesion state of slime adhered to the second region based on the transition of the first and second difference data;
The slime monitoring method characterized by having.   The slime monitoring method according to claim 10, wherein the first and second oxygen consumption data are acquired using an oxidation-reduction potentiometer or a dissolved oxygen meter. First pH data relating to the pH of water located in a first region within the tubular member through which water flows continuously, and first oxygen consumption data relating to the dissolved oxygen concentration of water located in the first region; The second pH data relating to the pH of the water located in the second region within the tubular member, to which slime adheres more easily than the first region, and the dissolution of the water located in the second region Continuously obtaining second oxygen consumption data relating to oxygen concentration;
The first difference data that is the difference between the first pH data and the second pH data is acquired, and the difference between the first oxygen consumption data and the second oxygen consumption data. Obtaining second difference data;
A step of determining an adhesion state of slime adhered to the second region based on the transition of the first and second difference data;
Based on the determination result of the adhesion state of the slime, a step of adding a slime remover into the water tank connected to the flowing water pipe for transporting the water;
A method for adding a slime remover.   13. The slime remover addition method according to claim 12, wherein the first and second oxygen consumption data are acquired using an oxidation-reduction potentiometer or a dissolved oxygen meter.

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