JP2011088075A - Method and system for preserving function of stone stack purifying embankment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To preserve a water purifying function of a stone stack purifying embankment even when it is exposed to a low oxygen water mass or a blue tide. <P>SOLUTION: The system 1 for preserving the function of the stone stack purifying embankment includes: an intake pump 8 installed in an internal water area 7 surrounded by the stone stack purifying embankment 2 and capable of taking therefrom water with low concentration oxygen or possibly with low concentration oxygen; an oxygen concentrator 9 and an oxygen dissolving device 10, both of which compose an oxygen water producing means capable of producing high concentration oxygen water by increasing a dissolved oxygen concentration in the sea water taken in by the intake pump; a conveying pump 11 and a discharge pipe 12, both of which compose an oxygen water delivery means capable of delivering the high concentration oxygen water to the stone stack purifying embankment 2, a tide gage 21 for measuring the tide level in an external water area 14, a dissolved oxygen meter 22 for measuring the dissolved oxygen concentration in the external water area 14; and a controller 23 for drive-controlling the oxygen concentrator 9, the oxygen dissolving device 10, the conveying pump 11, and the intake pump 8 according to the value measured by the tide gage 21 and the dissolved oxygen meter 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and system for maintaining a water purification function when a water purification levee is exposed to an anoxic water mass or a blue tide.

  In coastal waters near urban areas, the inflow load from rivers and the elution load from sediment sludge are large, and it is not easy to carry out wide area and fundamental water purification, but part of such water areas are surrounded by stone masonry purification banks. Attempts have been made to purify the inner waters spreading inside.

  Masonry purification levees are marine structures that are piled up from the sea bottom using gravel or stone as a dam body material, and when tidal and tides occur, the seawater in the outer water area passes between the gravels of the dam body material and becomes the inner water area. Move to.

  Here, pollutant components in seawater such as plankton are attached or trapped by a biofilm consisting of microorganisms attached and formed on the surface of the bank body material, and the turbid components attached and trapped are decomposed by the microorganisms. Or ingested by shellfish and crustaceans that live between gravel.

  That is, the seawater in the outer water area passes through the gravel of the embankment material that constitutes the masonry purification embankment, so that the pollutant components are removed and flows into the inner water area as clean seawater. It fulfills the function of water purification using natural ecology.

Japanese Patent Laid-Open No. 8-184081 JP 2000-45244 A JP-A-8-57489 JP-A-7-290084 JP 2005-46756 A

  However, as a result of the verification test by the applicant, it has been found that there is a concern that an anoxic water mass and a blue tide may flow into the masonry purification bank due to tides and waves. If such a case is encountered, the water purification function of the masonry purification bank will be significantly reduced.

  That is, the anoxic water mass is seawater whose dissolved oxygen concentration is reduced to, for example, less than 3.5 mg / l due to a large amount of oxygen consumption due to organic matter decomposition near the seabed. However, the hydrogen sulfide contained therein is in contact with oxygen near the sea surface to form colloidal sulfur.

  Therefore, when anoxic lumps and blue tides pass through the masonry purification bank due to tides and waves, the biofilms and habitats attached to the levee material will be exposed to anoxic or anoxic conditions. As a result, biofilms and habitats were killed, and as a result, the water purification function of the masonry purification dike was significantly reduced.

  The present invention has been made in consideration of the above-described circumstances, and provides a function maintenance method and system for a masonry purification bank that can maintain a water purification function even when exposed to anoxic blocks and blue tides. With the goal.

  In order to achieve the above object, the function maintenance method of a masonry purification embankment according to the present invention includes an inner water area surrounded by a masonry purification embankment, an outer water area extending outside the masonry purification embankment or its Water is taken from the inside of the levee, the dissolved oxygen concentration of the taken water is increased to obtain high-concentration oxygen water, and the high-concentration oxygen water is supplied between the gravels of the levee body material constituting the masonry purification levee.

  The function maintenance method of the masonry purification bank according to the present invention is to supply the high-concentration oxygen water through a discharge pipe embedded in the masonry purification bank so that a discharge port is positioned between the gravel. is there.

  Moreover, the function maintenance method of the masonry purification embankment which concerns on this invention performs the said supply when the water level in the said inner water area, the said outer water area, or the said bank body is rising.

  Moreover, the function maintenance method of the masonry purification embankment which concerns on this invention performs the said supply when the dissolved oxygen concentration in the said inner water area, the said outer water area, or the said bank body is less than predetermined value.

  Moreover, the function maintenance method of the masonry purification embankment which concerns on this invention performs the said water intake from the said inner water area.

  The function maintenance system for a masonry purification embankment according to the present invention is installed in an inner water area surrounded by a masonry purification embankment, an outer water area extending outside the masonry purification embankment, or a body of the embankment. An intake water pump capable of taking water from the inner water area, the outer water area or the dam body, and oxygen water generation capable of generating high-concentration oxygen water by increasing the dissolved oxygen concentration of the water from the intake pump connected to the intake pump on the input side And oxygen water supply means connected to the output side of the oxygen water generating means, and the oxygen water supply means, the high-concentration oxygen water between the gravel of the levee body material constituting the masonry purification dike It is comprised so that it may be supplied to.

  The function maintenance system for a masonry purification embankment according to the present invention is configured such that the oxygen water supply means is a discharge pipe connected to the output side of the oxygen water generation means, and the discharge pipe has a discharge port. It is buried in the stone masonry purification bank so as to be positioned between the gravel.

  Further, the function maintenance system for a stone masonry purification embankment according to the present invention includes a water level meter that measures the water level in the inner water area, the outer water area, or the bank body, and the oxygen water according to the value of the water level measured by the water level gauge. Control means for driving and controlling the generating means, the control means determines whether the water level is rising from the value by the water level gauge, and when it is determined that the water level is rising, the control means The oxygen water generating means is actuated.

  Moreover, the function maintenance system of the masonry purification bank according to the present invention is a dissolved oxygen meter that measures dissolved oxygen in the inner water area, the outer water area, or the bank body, and a dissolved oxygen concentration value measured by the dissolved oxygen meter. And a control means for drivingly controlling the oxygen water generating means, wherein the control means is configured to operate the oxygen water generating means when a value by the dissolved oxygen meter is less than a predetermined value. is there.

  Moreover, the function maintenance system of the masonry purification embankment which concerns on this invention installs the said intake pump in the said inner water area.

  When the masonry purification levee is exposed to anoxic water, the biofilms that are formed on the surface of the levee body material constituting the masonry purification levee and the organisms that live between the gravel are placed in an anoxic state as described above. The masonry purification dike loses its water purification function.

  In order to solve this problem, the present applicant conducted research and development focusing on whether or not oxygen should be supplied to the dam body of the masonry purification dam. In addition, it is difficult to supply a sufficient amount of oxygen with normal aeration, and it is difficult to supply oxygen to every corner of the levee because it is released to the atmosphere in a short time. It became clear that the oxygen-poor water that flowed into the basin contaminated the inner water area.

  Based on these points, we continued further research. After the oxygen water generating means raises it to high concentration oxygen water, the high concentration oxygen water is supplied between the gravels of the levee body material via the oxygen water supply means, so that the oxygen-poor water is stoned In addition to removing from the vicinity of the levee, new knowledge has been obtained that it is possible to prevent the death of organisms living between the biofilms and gravel attached to the surface of the levee body material.

  As a position to take in hypoxic water or water with the possibility,

  (a) Outside water area extending outside the masonry purification levee

  (b) Inner waters surrounded by a stone masonry purification bank

  (c) Masonry purification wall

However, if water is taken from the inner water area of the stone masonry dam, even after the oxygen-poor water flows into the inner water area through the masonry dam, Since the oxygen-poor water can be removed from the inner water area, the water quality of the inner water area can be purified.

  On the other hand, if a water intake pit is provided in the body of the masonry purification dike, for example, the water is taken from the water intake pit, the high-concentration oxygen water is quickly recovered by the intake pump after the supply. Fresh high-concentration oxygen water is always supplied between the pebbles of the timber, and it is possible to more reliably prevent the biofilms and the inhabitation organisms between the gravel.

  As the oxygen water generating means for increasing the dissolved oxygen concentration to generate high concentration oxygen water, for example, an apparatus capable of dissolving high concentration oxygen may be used as appropriate.

  Such oxygen water generating means is composed of, for example, a combination of a PSA type oxygen concentrating device and an oxygen dissolving device capable of dissolving, for example, about 90% of the high concentration oxygen gas generated by the oxygen concentrating device. Each of them can be appropriately selected from commercially available devices.

  In the present invention, the hypoxic water substantially includes anoxic water as a case where the dissolved oxygen concentration is extremely small, and a so-called hypoxic water mass is used in a concept including this. In addition, since the blue tide includes hydrogen sulfide and sulfur oxide obtained by oxidizing the hydrogen sulfide, it may be distinguished from a simple anoxic water mass having a low dissolved oxygen concentration. Is water having a low dissolved oxygen concentration, and is used as a concept including the blue tide.

  It is sufficient to supply the high-concentration oxygen water by an arbitrary method between the gravels of the embankment body material constituting the masonry purification bank, and the configuration of the oxygen water supply means is also arbitrary.

  For example, by configuring the oxygen water supply means with a watering device installed near the top of the masonry purification levee, high concentration oxygen water may permeate from the surface of the masonry purification dam to the inside, By configuring the oxygen water supply means with a supply pipe arranged on the outer water area side of the stone masonry purification bank and below the water surface, high-concentration oxygen water is jetted on the outer water area side of the stone masonry purification bank and allowed to flow into the levee body. Also good.

  Here, the oxygen water supply means is constituted by a discharge pipe connected to the output side of the oxygen water generation means, and the discharge pipe is embedded in the stone masonry purification bank so that the discharge port is positioned between the gravel. Then, since high concentration oxygen water can be discharged between the pebbles of the masonry purification bank without diffusing, it becomes possible to more surely prevent the biofilm and the interstitial habitats from being killed.

  The oxygen water supply means can be composed of a discharge pipe and a water pump connected to the upstream side or the downstream side of the discharge pipe in addition to the discharge pipe alone, but such a water pump is necessary. Depending on the situation, it may be appropriately provided.

  The timing of operating the oxygen water generating means is arbitrary, but the oxygen-poor water is mainly generated in the outer water area and flows into the inner water area. Therefore, the oxygen water generating means flows into the inner water area. If high-concentration oxygen water is supplied when the water level is rising, high-concentration oxygen water will be supplied to the gaps in the masonry purification bank in accordance with the inflow of the poor oxygen water. Maintenance is possible.

  To activate the oxygen water generation means, measure the water level in the inner water area, the outer water area or the dike body with a water level gauge, and determine whether the water level is rising from the value by the control means, and the water level is rising. When it is determined that the oxygen water generation means is operated by the control means.

  The water level may be measured in any of the inner water area, the outer water area, or the dam body of the masonry purification dyke, and when measuring in the dam body, for example, a measurement pit may be provided to measure the water level of the measurement pit. Good.

  In addition, if the high concentration oxygen water is supplied when the dissolved oxygen concentration in the inner water area, the outer water area or the body of the masonry purification bank is less than a predetermined value, the masonry purification bank is exposed to the anoxic water. Only when there is a fear, high-concentration oxygen water will be supplied, and it will be possible to efficiently maintain and manage the stone masonry dam, similar to the operation based on the rise in water level.

  In order to operate the oxygen water generating means, the dissolved oxygen in the inner water area, the outer water area or the levee body is measured with a dissolved oxygen meter, and when the value is less than a predetermined value, the oxygen water generating means is operated by the control means. do it.

Schematic of the function maintenance system 1 of a masonry purification bank. It is the figure of the discharge pipe 12, (a) is a layout view along the cross section orthogonal to the axis of the bank body, (b) is a vertical cross-sectional view along the AA line, (c) is an enlarged detail view of the discharge pipe . The flowchart which showed the implementation procedure of the function maintenance system 1 of a masonry purification bank. Schematic which showed the function maintenance system of the masonry purification embankment which concerns on a modification. Schematic which showed the function maintenance system of the masonry purification bank concerning another modification. Schematic which showed the function maintenance system of the masonry purification bank concerning another modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a function maintenance method and system for a masonry purification bank according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a schematic view showing a function maintenance system for a masonry purification bank according to the present embodiment. As can be seen from FIG. 1, the function maintenance system 1 for a masonry purification bank according to this embodiment is installed in an inner water area 7 surrounded by the masonry purification bank 2 and can take water from the inner water area, and the intake pump Oxygen concentration device 9 and oxygen dissolution device 10 as oxygen water generating means capable of generating high concentration oxygen water by increasing the dissolved oxygen concentration of seawater from the seawater, and oxygen water capable of supplying high concentration oxygen water to the masonry purification levee 2 It comprises a water pump 11 and a discharge pipe 12 as supply means.

  The masonry purification levee 2 is constructed by stacking levee body materials 3 such as gravel and stone from the seabed 4 and covering them with covering stones 5.

  The oxygen concentrator 9 is connected to a compressor (not shown) that takes air from the atmosphere and compresses it, a cooler and drain separator (not shown) that removes moisture from the compressed air in advance, and the drain separator. An adsorption cylinder (not shown), which adsorbs nitrogen in the air sent from the drain separator to the zeolite under pressure while desorbing the nitrogen adsorbed to the zeolite under reduced pressure. The process of exhausting to the atmosphere is repeated, and by repeating this adsorption / desorption process, oxygen in the air can be selectively taken out, for example, oxygen gas having a concentration of about 90% can be generated. Yes.

  In this oxygen concentrator 9, for example, two adsorption cylinders can be installed and used continuously and simultaneously while switching between the adsorption process and the desorption process.

  The oxygen dissolving device 10 blows the high-concentration oxygen gas sent from the oxygen concentrating device 9 into a jet box (not shown) filled with seawater sent from the water intake pump 8, thereby Thus, cavitation is generated, and high-concentration oxygen gas can be dissolved in poor oxygen water to about 90%, for example.

  The water pump 11 has its input side connected to the jet box of the oxygen dissolving apparatus 10 and its output side connected to the discharge pipe 12, and the discharge pipe 12 is formed in the discharge pipe as can be seen in FIG. A large number of discharged outlets 13 are embedded in the stone masonry purification dam 2 so as to be positioned between the gravels of the dam body material 3 constituting the masonry purification dyke 2, and thus generated by the oxygen dissolving device 10. High-concentration oxygen water can be supplied between the gravel of the bank body material 3 constituting the masonry purification bank 2.

  The discharge pipe 12 has the same cross-sectional area, number, burial depth, etc. as appropriate so that high-concentration oxygen water can be reliably supplied to every part of the masonry purification dam 2, particularly to the bottom layer at the center of the dam body. From the viewpoint, the hole diameter and the number of the discharge ports 13 are appropriately set.

  As shown in FIG. 1, the function maintenance system 1 for a masonry purification bank according to the present embodiment includes a tide gauge 21 and a dissolved oxygen gauge 22 that respectively measure the tide level and dissolved oxygen concentration in the outer water area 14 of the masonry purification bank 2, and the tide level. A control device 23 that controls the drive of the oxygen concentrator 9, the oxygen dissolver 10, the water pump 11, and the water intake pump 8 according to the values measured by the meter 21 and the dissolved oxygen meter 22 is provided. Then, it is determined whether or not the water level in the outer water area 14 is rising from the value obtained by the tide gauge 21, and when it is determined that the water level is rising, or the value obtained by the dissolved oxygen meter 22 is a predetermined value, for example, 3. When it is less than 5 mg / l, the oxygen concentrator 9, the oxygen dissolver 10, the water pump 11 and the water intake pump 8 are operated.

  FIG. 3 is a flowchart showing a procedure for implementing a method for maintaining the function of the masonry purification bank 2 using the masonry purification bank function maintenance system 1 according to the present embodiment. As can be seen from the figure, in the method for maintaining the function of the masonry purification bank according to the present embodiment, first, the tide level and the dissolved oxygen concentration in the outer water area 14 of the masonry purification bank 2 are measured by the tide gauge 21 and the dissolved oxygen meter 22, respectively. (Step 101).

  Next, it is determined from the value obtained by the tide gauge 21 whether or not the tide level in the outer water area 14 is rising (step 102).

  Here, when it is not increasing (step 102, NO), it is determined whether the dissolved oxygen concentration is a predetermined value, for example, less than 3.5 mg / l (step 103). NO), the measurement by the tide gauge 21 and the dissolved oxygen meter 22 is continued (step 101).

  On the other hand, if the tide level in the outer water area 14 is rising (step 102, YES), if the oxygen-poor water is present on the outer water area 14 side, the oxygen-lowering water is moved from the outer water area 14 to the inner water area 7 by the tide. Since there is a possibility of inflow, the control device 23 operates the water intake pump 8 to take in oxygen-poor water or seawater that may be there from the inner water area 7 surrounded by the masonry purification bank 2 (step 104). .

  Moreover, if the value by the dissolved oxygen meter 22 is less than a predetermined value (step 103, YES), since the oxygen-poor water may flow into the inner water area 7 from the outer water area 14 due to the waves, the control device 23 The water intake pump 8 is operated to take the oxygen-poor water or possibly seawater from the inner water area 7 surrounded by the masonry purification bank 2 (step 104).

  Next, by operating the oxygen concentrating device 9 and the oxygen dissolving device 10 with the control device 23, the dissolved oxygen concentration of the taken-in poor oxygen water or possibly seawater is increased to obtain high-concentration oxygen water (step). 105).

  Next, by controlling the water supply pump 11 with the control device 23, the high-concentration oxygen water generated by the oxygen concentrating device 9 and the oxygen dissolving device 10 is supplied through the discharge pipe 12, and formed in the discharge pipe. It discharges between the gravels of the bank body material 3 through the discharge port 13 (step 106).

  As described above, according to the function maintenance system 1 and method of a stone masonry purification embankment according to the present embodiment, poor oxygen water or possibly seawater is taken with the water pump 8, and then the dissolved oxygen concentration is set. After increasing the oxygen concentration device 9 and the oxygen dissolving device 10 to high-concentration oxygen water, the high-concentration oxygen water is supplied by the water supply pump 11, and the gravel of the dam body material 3 from the discharge port 13 formed in the discharge pipe 12. Since it is discharged in the meantime, it is possible to prevent the death of living organisms living on the surface of the levee body material 3 and gravel, and to maintain the water purification function of the masonry purification levee 2 It becomes.

  Moreover, according to the function maintenance system 1 and the method of the masonry purification bank according to the present embodiment, by installing the intake pump 8 in the inner water area 7 of the stone masonry purification bank 2, the poor oxygen water or the seawater with the possibility thereof is obtained. Since water is taken from the inner water area, it becomes possible to remove the oxygen-poor water from the inner water area even after the oxygen-lowering water passes through the stone masonry dam 2 and flows into the inner water area 7. In addition to maintaining the water quality of the masonry purification bank 2, it is possible to purify the water quality of the inner water area 7 together.

  Moreover, according to the function maintenance system 1 and method of the masonry purification bank according to the present embodiment, the tide level in the outer water area 14 of the masonry purification bank 2 is measured by the tide gauge 21 and according to the value measured by the tide gauge. Since the oxygen concentrating device 9, the oxygen dissolving device 10, the water supply pump 11, and the water intake pump 8 are driven and controlled by the control device 23, the high-concentration oxygen water is configured to match the inflow of the oxygen-poor water to constitute the masonry purification dike 2 It becomes possible to discharge between the gravel of the levee body material 3 to be performed, and thus efficient maintenance management of the masonry purification levee 2 becomes possible.

  Moreover, according to the function maintenance system 1 and method of the masonry purification bank according to the present embodiment, the dissolved oxygen concentration in the outer water area 14 of the masonry purification bank 2 is measured by the dissolved oxygen meter 22 and measured by the dissolved oxygen meter. When the oxygen concentrating device 9, the oxygen dissolving device 10, the water pump 11 and the water intake pump 8 are driven and controlled by the control device 23 according to the values, there is a possibility that the stone masonry purification bank 2 may be exposed to the oxygen-poor water Only high-concentration oxygen water can be discharged between the gravel of the bank body material 3, and further efficient maintenance and management of the masonry purification bank 2 is possible.

  In the present embodiment, the tide level and dissolved oxygen concentration in the outer water area 14 of the masonry purification bank 2 are measured by the tide gauge 21 and the dissolved oxygen gauge 22, respectively, and the oxygen concentrator 9 and the oxygen dissolver 10 according to these measured values. The water pump 11 and the water intake pump 8 are driven and controlled by the control device 23. However, only one of the tide gauge 21 and the dissolved oxygen gauge 22 is installed, and only either the tide level or the dissolved oxygen concentration is installed. The oxygen concentrator 9, the oxygen dissolver 10, the water pump 11 and the water intake pump 8 may be driven and controlled by the controller 23.

  For example, only the dissolved oxygen meter 22 is installed in the outer water area 14, and the oxygen concentrator 9, the oxygen dissolver 10, the water pump 11, and the water intake pump 8 are controlled by the controller 23 according to the measured value of the dissolved oxygen concentration regardless of the tide level. If the damp oxygen water arrives at the stone masonry dam 2, high concentration oxygen water is already filled between the gravel of the dam body material 3 of the masonry dam 2, Thus, the high-concentration oxygen water serves as a barrier for protecting the stone masonry dam 2 and its inner water area 7 and prevents the masonry dam 2 from being degraded in function.

  On the other hand, the operating conditions of each device by the control device 23 can be such that the tide level is rising and the dissolved oxygen concentration is less than a predetermined value. The system is operated only when there is a very high possibility that it is flowing in, and the operating cost of the system can be reduced.

  In addition, the oxygen concentration device 9, the oxygen dissolution device 10, the water supply pump 11, and the water intake pump 8 are manually operated while monitoring the tide level and dissolved oxygen concentration with another system, or as appropriate regardless of the tide level and dissolved oxygen concentration. You may do it.

  On the other hand, the high concentration oxygen water may be continuously supplied by always operating the oxygen concentrating device 9, the oxygen dissolving device 10, the water supply pump 11, and the water intake pump 8.

  In such a modification, priority is given to maintaining the function of the masonry purification bank over the operating cost of the system. FIG. 4A shows such a modified example, and the tide gauge 21, the dissolved oxygen gauge 22, and the control device 23 are not necessary.

  Moreover, in this embodiment, although it was made to take in anoxic water or the seawater with the possibility from the inner water area 7 enclosed by the masonry purification bank 2, it replaces with this from the bank of the masonry purification bank 2 You may make it take water.

  FIG. 4 (b) shows such a modified example, in which a water intake pit is provided in the bank body and a water intake pump 8 is installed in the water intake pit. In such a modified example, since the high-concentration oxygen water that has exited the discharge port 13 is formed with a relatively short path, the flow collected by the intake pump 8 together with the oxygen-poor water or sea water that is likely to be formed is always fresh. High-concentration oxygen water is supplied between the gravels of the levee body material, and thus it is possible to more surely prevent the biofilms and inter-gravel living organisms from being killed.

  Moreover, in this embodiment, although the water supply pump 11 was provided as an oxygen water supply means, depending on the case, this may be abbreviate | omitted. In such a modified example, the oxygen water supply means is constituted by only the discharge pipe 12, and the control device 23 drives and controls the oxygen concentrating device 9, the oxygen dissolving device 10, and the water intake pump 8.

  Moreover, in this embodiment, high concentration oxygen water is directly supplied between the gravel of the embankment body material 3 which comprises the masonry purification bank 2 through the discharge pipe 12 embed | buried in the stone masonry purification bank 2, and high concentration oxygen Although water diffusion is prevented, high-concentration oxygen water may be indirectly supplied between the gravels of the bank body material 3 in some cases.

  5 and 6 show such a modified example. In the modified example shown in FIG. 5, a watering device 52 as oxygen water supply means is installed at the top of the dam body of the masonry purification dike 2 and the watering is performed. By connecting the input side of the apparatus to the output side of the water pump 11, high concentration oxygen water is configured to permeate from the surface of the masonry purification bank 2 into the interior. In the modification shown in FIG. By arranging the supply pipe 62 as oxygen water supply means on the outer water area 14 side of the stone masonry purification bank 2 and below the water surface, and connecting the base end side of the supply pipe to the output side of the water pump 11, high concentration Oxygen water is jetted on the outer water area 14 side of the stone masonry purification bank 2 and flows into the bank body.

  Even in such a configuration, although the oxygen concentration of the high-concentration oxygen water is somewhat reduced, it is possible to supply the high-concentration oxygen water to the gap between the levee body materials 3 constituting the masonry purification dam 2. In addition to the operational effects similar to those of the embodiment, it is not necessary to modify the existing masonry purification bank, so that the construction cost can be reduced.

1 Function maintenance system of stone masonry purification bank 2 Masonry purification bank 3 Embankment material 7 Inner water area 8 Intake pump 9 Oxygen concentrator (oxygen water generating means)
10 Oxygen dissolving device (oxygen water generating means)
11 Water pump (oxygen water supply means)
12 Discharge pipe (oxygen water supply means)
13 Discharge port 14 Outside water area 21 Tide gauge (water level gauge)
22 dissolved oxygen meter 23 control device (control means)
52 Watering device (oxygen water supply means)
62 Supply pipe (oxygen water supply means)

Claims (10)

Water is taken from the inner water area surrounded by the stone masonry dam, the outer water area extending outside the masonry dam or the body of the masonry dam, and the dissolved oxygen concentration is increased to high-concentration oxygen water, and the high-concentration oxygen water A method for maintaining the function of a masonry purification dike, characterized in that the masonry purification dike is supplied between the gravels of the embankment body material. The function maintenance method of the masonry purification bank of Claim 1 which supplies the said high concentration oxygen water through the discharge pipe embed | buried in the said masonry purification bank so that a discharge port may be positioned between the said gravel. The function maintenance method of the masonry purification embankment of Claim 1 or Claim 2 which performs the said supply when the water level in the said inner water area, the said outer water area, or the said bank body is rising. The function maintenance method of the masonry purification levee according to claim 1 or 2, wherein the supply is performed when a dissolved oxygen concentration in the inner water area, the outer water area or the levee body is less than a predetermined value. The function maintenance method of the masonry purification bank of Claim 1 or Claim 2 which performs the said water intake from the said inner water area. An inner water area surrounded by a stone masonry purification bank, an outer water area extending outside the masonry purification bank, or a water intake pump installed in the body of the inner water area, the outer water area or the bank body, and the water intake pump on the input side And oxygen water generating means capable of generating high concentration oxygen water by increasing the dissolved oxygen concentration of water from the water intake pump, and oxygen water supply means connected to the output side of the oxygen water generating means The function maintenance system for a stone masonry purification bank, characterized in that the oxygen water supply means is configured to supply the high-concentration oxygen water between gravels of a bank body material constituting the stone masonry purification bank. The oxygen water supply means comprises a discharge pipe connected to the output side of the oxygen water generation means, and the discharge pipe is embedded in the masonry purification bank so that the discharge port is positioned between the gravel The function maintenance system of the masonry purification embankment of Claim 6. A water level meter that measures the water level in the inner water area, the outer water area, or the levee body, and a control means that drives and controls the oxygen water generating means in accordance with the value of the water level measured by the water level gauge. 7. It is determined whether or not the water level is rising from a value obtained by the water level gauge, and the oxygen water generating means is operated when it is determined that the water level is rising. Or the function maintenance system of the masonry purification embankment of Claim 7. A dissolved oxygen meter for measuring dissolved oxygen in the inner water area, the outer water area or the bank body, and a control means for driving and controlling the oxygen water generating means according to the value of the dissolved oxygen concentration measured by the dissolved oxygen meter. The function maintenance system of a masonry purification bank according to claim 6 or 7, wherein the control means is configured to operate the oxygen water generation means when a value by the dissolved oxygen meter is less than a predetermined value. The function maintenance system of the masonry purification bank according to claim 6 or 7, wherein the intake pump is installed in the inner water area.

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