Water quality measuring device and water quality measuring system

Abstract

To provide a water quality measuring device capable of measuring an acid consumption amount or alkali consumption amount of an unfiltered sample by titration to improve measurement accuracy.SOLUTION: A water quality measuring device for measuring an acid consumption amount or alkali consumption amount of a sample by titration, comprises: a sample acquisition device that acquires a sample from a sample supply source; a reaction tank having a reaction chamber communicating with the sample acquisition device; a dripping unit that drips a titrant into the reaction chamber; a defoaming agent supply unit that supplies a defoaming agent to the reaction chamber; and a pH measuring device that is provided in the reaction chamber, and measures a hydrogen ion concentration of the sample.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a water quality measurement device and a water quality measurement system that measure the acid consumption or alkali consumption of a sample by titration. [Background technology]

[0002] Patent Document 1 discloses a water quality measurement method for measuring the total alkalinity and total carbonate concentration in water, particularly seawater. In this water quality measurement method, the test water (seawater) is sealed in a sample bottle and subjected to acid titration until a predetermined pH is reached, and the total alkalinity and total carbonate concentration are measured from the amount of acid titration obtained from the acid titration result and the displacement of a pH electrode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-264913 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when titration (particularly acid titration) is performed on a sample, depending on the sample, a large amount of bubbles may be generated, which may reduce the measurement accuracy.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a water quality measuring device that can measure the acid consumption or alkali consumption of a sample by titration and improve measurement accuracy. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the water quality measuring device according to the present disclosure is a water quality measuring device that measures the acid consumption or alkali consumption of a sample by titration, and includes: a sample acquiring device that acquires the sample from a sample supply source; a reaction tank formed with a reaction chamber that communicates with the sample acquiring device; a dripping unit that drips a titrant into the reaction chamber; an antifoaming agent supply unit that supplies an antifoaming agent to the reaction chamber; and a pH measuring device that is provided within the reaction chamber and measures the hydrogen ion concentration of the sample. [Effects of the Invention]

[0007] According to the water quality measuring device of the present disclosure, the acid consumption or alkali consumption of a sample is measured by titration, thereby improving measurement accuracy. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a schematic configuration of a waste treatment facility equipped with a water quality measurement device according to an embodiment. [Figure 2] 3A and 3B are diagrams illustrating the configuration of a gas supply pipe of a gas supply unit according to some embodiments. [Figure 3] FIG. 10 is a diagram illustrating a schematic configuration of a water quality measurement system according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a water quality measurement device and a water quality measurement system according to an embodiment of the present disclosure will be described with reference to the drawings. The embodiment shows one aspect of the present disclosure, does not limit the present disclosure, and can be modified as desired within the scope of the technical concept of the present disclosure.

[0010] 1 is a diagram schematically illustrating the configuration of a waste treatment facility 100 equipped with a water quality measuring device 1 according to one embodiment. In the example illustrated in FIG. 1, the waste treatment facility 100 includes a reforming device 102, a methane fermentation tank 104, and a circulation line 106.

[0011] The reformer 102 uses steam to hydrolyze the waste W in a batchwise manner to produce a reformed product Wm. The waste W is, for example, municipal solid waste. Municipal solid waste is primarily composed of food waste, paper waste, and plastic waste, with a small amount of metal. Note that the present disclosure does not limit the waste W to municipal solid waste. The waste W may also be waste with a higher moisture content than municipal solid waste, such as sludge generated by treating wastewater from factories or agricultural waste.

[0012] The hydrolysis of the waste W in the reformer 102 may be wet hydrolysis in which steam contacts the waste W and heats the waste W, or dry hydrolysis in which steam does not contact the waste W and indirectly heats the waste W.

[0013] The methane fermentation tank 104 receives the reformed product Wm from the reforming device 102, and generates methane gas and a methane fermentation liquid X by decomposing the reformed product Wm into smaller molecules using microorganisms.

[0014] The circulation line 106 removes the content of the methane fermentation tank 104 to the outside and returns it to the methane fermentation tank 104. The circulation line 106 connects a methane fermentation liquid outlet 104a formed at the bottom of the methane fermentation tank 104 with a methane fermentation liquid return port 104b formed at the top of the methane fermentation tank 104. The circulation line 106 removes the methane fermentation liquid X in the methane fermentation tank 104 to the outside of the methane fermentation tank 104 via the methane fermentation liquid outlet 104a, and returns the methane fermentation liquid X removed to the outside of the methane fermentation tank 104 to the methane fermentation tank 104 via the methane fermentation liquid return port 104b. In the methane fermentation tank 104, the methane fermentation liquid X in the methane fermentation tank 104 is stirred by the circulation line 106.

[0015] <Water quality measuring device> (composition) The water quality measuring device 1 measures the acid consumption or alkali consumption of a sample by titration. The sample is not particularly limited as long as it is a solution containing a solvent and a solute. In one embodiment, as shown in FIG. 1 , the water quality measuring device 1 includes a sample acquiring device 2, a reaction tank 4, a dripping unit 6, an antifoaming agent supply unit 8, and a pH measuring device 10.

[0016] The sample acquiring device 2 acquires a sample (methane fermentation liquid X) from a sample supply source (circulation line 106). In one embodiment, as illustrated in FIG. 1 , the sample acquiring device 2 includes a supply line 12 connecting the circulation line 106 and the reaction tank 4, and a supply valve 13 provided on the supply line 12. When the supply valve 13 is opened, a portion of the methane fermentation liquid X circulating through the circulation line 106 flows through the supply line 12 toward the reaction tank 4 (a second supply valve 82, which will be described later, is also open). In other words, the methane fermentation liquid X is supplied as a sample to the reaction chamber 5 of the reaction tank 4. On the other hand, when the supply valve 13 is closed, the supply of the methane fermentation liquid X to the reaction chamber 5 of the reaction tank 4 is stopped. In one embodiment, the supply line 12 is not provided with a filtration device (e.g., a strainer) that filters the methane fermentation liquid X circulating through the supply line 12. In addition, the circulation line 106 is not provided with a filtration device for filtering the methane fermentation liquid X flowing through the circulation line 106, and the methane fermentation liquid X in the methane fermentation tank 104 is supplied to the reaction chamber 5 of the reaction tank 4 without filtration.

[0017] The reaction tank 4 has a cylindrical shape, and a reaction chamber 5 is formed inside the reaction tank 4, which communicates with the sample acquisition device 2. In one embodiment, the reaction chamber 5 communicates with a supply line 12, and the methane fermentation liquid X is supplied through the supply line 12 as described above.

[0018] In one embodiment, as illustrated in FIG. 1 , the water quality measuring device 1 further includes a dilution unit 14 for supplying dilution water A to the reaction chamber 5. The dilution water A is not particularly limited, but is, for example, water, and dilutes the methane fermentation liquid X by being mixed with the methane fermentation liquid X. Although not shown, in some embodiments, the dilution unit 14 supplies the dilution water A to the supply line 12. That is, the dilution unit 14 supplies the dilution water A to the reaction chamber 5 via the supply line 12.

[0019] 1 , the water quality measuring device 1 further includes a level sensor 15 that detects the liquid level of the methane fermentation liquid X in the reaction chamber 5. This makes it easy to adjust the amounts of the methane fermentation liquid X and dilution water A to be supplied to the reaction chamber 5, and makes it easy to prepare a sample of the methane fermentation liquid X diluted at any dilution ratio or a sample of the methane fermentation liquid X adjusted to any pH. In some embodiments, the water quality measuring device 1 measures the amount of acid consumption or alkali consumption of the methane fermentation liquid X diluted 2-fold.

[0020] In one embodiment, as illustrated in Fig. 1, the water quality measuring device 1 further includes a quantitative adjustment line 21 connected to the reaction tank 4. This quantitative adjustment line 21 is configured to be able to switch whether or not to discharge the methane fermentation liquid X from the reaction chamber 5 when the liquid level of the methane fermentation liquid X in the reaction chamber 5 exceeds a predetermined height. In the embodiment illustrated in Fig. 1, the quantitative adjustment line 21 connects the reaction tank 4 with a drainage tank 70, which will be described later. The quantitative adjustment line 21 communicates with the reaction chamber 5 via an opening 4h that is formed in a side wall of the reaction tank 4 in an openable and closable manner. The opening 4h is located below an overflow port 4e, which will be described later.

[0021] According to this configuration, by leaving the opening 4h open, the amount of the methane fermentation liquid X supplied to the reaction chamber 5 can be adjusted to a fixed amount corresponding to the height at which the opening 4h is located, making it possible to easily prepare a fixed amount of the methane fermentation liquid X. Furthermore, by supplying dilution water A to the reaction chamber 5 after a fixed amount of the methane fermentation liquid X has been prepared, it is possible to easily prepare a sample of the methane fermentation liquid X diluted at an arbitrary rate.

[0022] In one embodiment, as illustrated in FIG. 1 , the water quality measuring device 1 further includes a reaction chamber heat insulating material 17 that keeps the reaction chamber 5 warm, and a reaction chamber heating device 19 that heats the reaction chamber 5. The reaction chamber heat insulating material 17 (shown by a dotted line in FIG. 1 ) surrounds the outer periphery of the reaction tank 4 and suppresses heat transfer between the reaction chamber 5 (inside the reaction tank 4) and the outside of the reaction tank 4. The reaction chamber heat insulating material 17 is made of a flexible and insulating material, such as glass wool. The reaction chamber heating device 19 is, for example, a wire-wound heater that is wrapped around the reaction tank 4. Although not shown, in some embodiments, the water quality measuring device 1 includes either the reaction chamber heat insulating material 17 or the reaction chamber heating device 19.

[0023] The dripping unit 6 is configured to drip a titrant Y having a predetermined concentration into the reaction chamber 5. In one embodiment, as illustrated in FIG. 1 , the dripping unit 6 includes a first dripping unit 6A(6) that drips sulfuric acid (H2SO4) as the titrant Y into the reaction chamber 5, and a second dripping unit 6B(6) that drips an aqueous sodium hydroxide solution (NaOH) as the titrant Y into the reaction chamber 5. That is, the first dripping unit 6A performs acid titration, and the acid consumption (alkalinity) of the methane fermentation liquid X is measured. Similarly, the second dripping unit 6B performs alkali titration, and the alkali consumption (acidity) of the methane fermentation liquid X is measured.

[0024] The first dripping unit 6A includes a titrant reservoir 16 in which sulfuric acid (titrant Y) is stored, a dripping nozzle 18 fitted in the upper wall 4a of the reaction tank 4, a titrant line 20 connecting the titrant reservoir 16 and the dripping nozzle 18, and a titrant pump 22 provided on the titrant line 20. By driving the titrant pump 22, sulfuric acid flows through the titrant line 20 from the titrant reservoir 16 toward the dripping nozzle 18. Then, the sulfuric acid is dripped from the dripping nozzle 18 into the reaction chamber 5.

[0025] 1, first dropping unit 6A further includes a first load cell 24 that measures the weight of titrant reservoir tank 16. By obtaining the measurement value of first load cell 24, the amount of sulfuric acid (titrant Y) dropped into reaction chamber 5 can be easily calculated.

[0026] 1, the first dripping unit 6A further includes a first tray 26 disposed below the titrant pump 22 for receiving sulfuric acid (titrant Y) leaking from the titrant pump 22, and a first leakage sensor 28 for detecting sulfuric acid in the first tray 26. The titrant pump 22 may leak due to, for example, aged deterioration of a packing. Therefore, by providing the first tray 26 and the first leakage sensor 28, leakage of sulfuric acid from the titrant pump 22 can be promptly detected.

[0027] The second dripping unit 6B has a similar configuration to the first dripping unit 6A, and is assigned the same reference numerals as the configuration of the first dripping unit 6A, and detailed description thereof will be omitted. The second dripping unit 6B is obtained by replacing the "sulfuric acid" that appears in the above description of the first dripping unit 6A with "aqueous sodium hydroxide solution." In one embodiment, the water quality measuring device 1 includes two dripping units 6 (first dripping unit 6A, second dripping unit 6B) and is configured to be able to measure the acid consumption and alkali consumption of the methane fermentation liquid X, but the present disclosure is not limited to this form. In some embodiments, the water quality measuring device 1 includes one dripping unit 6 in which acid titration or alkali titration is performed.

[0028] The antifoaming agent supply unit 8 is configured to supply an antifoaming agent Z to the reaction chamber 5. The antifoaming agent Z breaks down bubbles that are generated when the titrant Y is dropped into the methane fermentation liquor X (particularly when performing acid titration) or when bubbles are generated by aeration, which will be described later, and is, for example, an oil-based antifoaming agent or a surfactant-based antifoaming agent. By adding such an antifoaming agent Z to the methane fermentation liquor X before the dropping of the titrant Y or before aeration, it is possible to suppress the generation of the above-mentioned bubbles themselves.

[0029] 1 , the defoaming agent supply unit 8 includes an defoaming agent reservoir tank 30 in which the defoaming agent Z is stored, an defoaming agent nozzle 32 fitted into the upper wall 4a of the reaction tank 4, an defoaming agent line 34 connecting the defoaming agent reservoir tank 30 and the defoaming agent nozzle 32, and an defoaming agent pump 36 provided in the defoaming agent line 34. By driving the defoaming agent pump 36, the defoaming agent Z flows through the defoaming agent line 34 from the defoaming agent reservoir tank 30 toward the defoaming agent nozzle 32. The defoaming agent Z is then supplied from the defoaming agent nozzle 32 to the reaction chamber 5. That is, the defoaming agent nozzle 32 is provided in the upper part of the reaction tank 4 and sprays the defoaming agent Z from above the methane fermentation liquor X (sample) in the reaction chamber 5.

[0030] 1, the defoaming agent supplying unit 8 further includes a second load cell 38 that measures the weight of the defoaming agent reservoir tank 30. By obtaining the measurement value of the second load cell 38, the amount of the defoaming agent Z supplied to the reaction chamber 5 can be easily calculated.

[0031] In the embodiment illustrated in FIG. 1 , the defoaming agent supply unit 8 further includes a second tray 40 disposed below the defoaming agent pump 36 to receive the defoaming agent Z leaking from the defoaming agent pump 36, and a second leakage sensor 42 to detect the defoaming agent Z in the second tray 40. The defoaming agent pump 36 may leak due to, for example, aging of the packing. For this reason, by providing the second tray 40 and the second leakage sensor 42, leakage of the defoaming agent Z from the defoaming agent pump 36 can be quickly detected.

[0032] The pH measuring device 10 is provided in the reaction chamber 5 and measures the hydrogen ion concentration of the methane fermentation liquid X (sample). The pH measuring device 10 is located below an overflow port 4e, which will be described later.

[0033] 1, the water quality measuring device 1 further includes a gas supply unit 50 for circulating a gas G through the methane fermentation liquid X (sample) in the reaction chamber 5. The gas G is not particularly limited as long as it is gaseous, and may be, for example, air, carbon dioxide gas, or nitrogen gas.

[0034] 1, the gas supply unit 50 includes a buffer tank 52 that stores gas G, a gas supply pipe 54 that passes through the lower part of the reaction chamber 5 and through which the gas G flows, and a gas supply line 56 that connects the buffer tank 52 and the gas supply pipe 54. The gas supply pipe 54 is formed with a gas supply hole 55 that allows the gas G to flow into the reaction chamber 5.

[0035] A gas valve 58 and a gas pump 60 are provided on the gas supply line 56, and by opening the gas valve 58 and driving the gas pump 60, the gas G flows through the gas supply line 56 from the buffer tank 52 toward the gas supply pipe 54. The gas G then flows out into the reaction chamber 5 through the gas supply hole 55. The gas G flowing out from the gas supply hole 55 agitates the methane fermentation liquid X in the reaction chamber 5. In other words, the gas supply unit 50 aerates the methane fermentation liquid X in the reaction chamber 5.

[0036] FIG. 2 is a diagram illustrating the configuration of a gas supply pipe 54 of a gas supply unit 50 according to some embodiments, viewing the reaction chamber 5 from above. As illustrated in FIG. 2 , in some embodiments, the gas supply unit 50 includes a plurality of gas supply pipes 54 arranged at intervals from one another along one horizontal direction D1. In a cross direction D2 intersecting the one horizontal direction D1, assuming that the side opposite the first side wall 4c of the reaction vessel 4 into which the gas supply pipes 54 are fitted is the second side wall 4d, the tip of each of the plurality of gas supply pipes 54 is located near the second side wall 4d. Furthermore, each of the plurality of gas supply pipes 54 has a plurality of gas supply holes 55 formed therein and arranged at intervals from one another along the cross direction D2. With this configuration, the gas supply unit 50 can perform full aeration, which involves thoroughly stirring the methane fermentation liquor X in the reaction chamber 5.

[0037] In the embodiment illustrated in FIG. 1, the gas supply unit 50 further includes a gas extraction line 62 , a heating device 64 , and a heat insulating material 66 .

[0038] One end of the gas outlet line 62 is connected to a gas outlet 4b formed at the top of the reaction chamber 4, and the other end is connected to the buffer tank 52. The gas outlet 4b is located above an overflow port 4e (described later). When the air pressure in the reaction chamber 5 becomes higher than the air pressure in the gas outlet line 62, gas G in the reaction chamber 5 flows through the gas outlet line 62 toward the buffer tank 52. Therefore, the gas supply line 56 and the gas outlet line 62 constitute a gas circulation line 68 that draws gas G from the reaction chamber 5 and returns it to the reaction chamber 5. Furthermore, the buffer tank 52 stores gas G flowing through the gas outlet line 62 or liquid phase B generated by condensation of gas G in the buffer tank 52. In other words, the buffer tank 52 functions as a vessel that separates liquid phase B from gas G drawn from the reaction chamber 5. In some embodiments, the buffer tank 52 includes a pressure reducing section that reduces the pressure inside the buffer tank 52 and a demister disposed therein.

[0039] The heating device 64 heats the gas G flowing through the gas circulation line 68. In one embodiment, as illustrated in Fig. 1 , the heating device 64 is provided in the buffer tank 52 and heats the gas G in the buffer tank 52. Such a heating device 64 is, for example, a wire-wound heater that is wound around the buffer tank 52 and heats the gas G stored in the buffer tank 52. In some embodiments, the heating device 64 is provided in the gas supply line 56 or the gas extraction line 62.

[0040] The thermal insulation material 66 keeps the gas G flowing through the gas circulation line 68 warm. In one embodiment, as illustrated in FIG. 1 , the thermal insulation material 66 (shown by a dashed line in FIG. 1 ) surrounds the outer periphery of the gas supply line 56 and the gas outlet line 62, and suppresses heat transfer between the inside and outside of the gas supply line 56 and between the inside and outside of the gas outlet line 62. The material of the thermal insulation material 66 is flexible and insulating, and is, for example, glass wool. In some embodiments, the thermal insulation material 66 surrounds the outer periphery of the gas supply line 56.

[0041] In one embodiment, as illustrated in FIG. 1 , the water quality measuring device 1 further includes a wastewater tank 70 that stores the methane fermentation liquid X (sample) discharged from the reaction tank 4, and a liquid phase discharge line 72 that connects the wastewater tank 70 to the buffer tank 52. In the embodiment illustrated in FIG. 1 , the water quality measuring device 1 includes a first line 74 that connects the bottom of the reaction tank 4 to the wastewater tank 70 and through which the methane fermentation liquid X flows. A first valve 75 is provided in the first line 74, and when the first valve 75 is opened, the methane fermentation liquid X flows through the first line 74 from the reaction tank 4 toward the wastewater tank 70. The liquid phase discharge line 72 connects the bottom of the buffer tank 52 to the wastewater tank 70. A liquid phase discharge valve 73 is provided in the liquid phase discharge line 72, and when the liquid phase discharge valve 73 is opened, the liquid phase B flows through the liquid phase discharge line 72 from the buffer tank 52 toward the wastewater tank 70.

[0042] 1, the water quality measuring device 1 includes a second line 78 that connects an overflow port 4e formed in the side wall of the reaction tank 4 to the drainage tank 70. By forming the overflow port 4e, the methane fermentation liquid X can be discharged from the reaction tank 4 when the liquid level of the methane fermentation liquid X in the reaction chamber 5 exceeds a predetermined height.

[0043] 1 , the water quality measuring device 1 further includes a third line 80, one end of which is connected to the downstream side of the supply line 12 (toward the reaction tank 4) relative to the supply valve 13 and the other end of which is connected to the wastewater tank 70, and a third valve 81 provided on the third line 80. In this case, a second supply valve 82 is further provided on the supply line 12 downstream of the connection point of the third line 80. Before measuring the methane fermentation liquid X using the water quality measuring device 1, the supply valve 13 and the third valve 81 are opened, so that the methane fermentation liquid X is transferred to the wastewater tank 70. Then, after a certain amount of the methane fermentation liquid X has been transferred to the wastewater tank 70, the second supply valve 82 is opened and the third valve 81 is closed, so that the entire amount of the methane fermentation liquid X that has flowed into the supply line 12 is supplied to the reaction tank 4. This shortens the time it takes to supply the methane fermentation liquid X to the reaction tank 4.

[0044] 1 , the water quality measuring device 1 further includes an air line 86 having one end 84 open to the atmosphere and the other end connected to the reaction tank 4, and an air valve 88 provided on the air line 86. After the water quality measuring device 1 has finished measuring the water quality of the methane fermentation liquid X, the air valve 88 is opened, thereby releasing the reaction chamber 5 from its sealed state and allowing the methane fermentation liquid X in the reaction chamber 5 to be discharged into the wastewater tank 70.

[0045] In the embodiment illustrated in FIG. 1, the reaction tank 4 includes a discharge port 4g formed in the lower wall 4f. The bottom surface of the lower wall 4f facing the reaction chamber 5 is inclined downward as it approaches the discharge port 4g. The first line 74 described above is in communication with the reaction chamber 5 via the discharge port 4g. This configuration allows the methane fermentation liquid X to be smoothly discharged from the reaction chamber 5. Note that, although the entire bottom surface of the lower wall 4f is inclined in the embodiment illustrated in FIG. 1, the present disclosure is not limited to this embodiment. In some embodiments, only a portion of the bottom surface of the lower wall 4f is inclined.

[0046] 1, the water quality measuring device 1 further includes a calibration solution supply unit 85 for supplying calibration solution C of a known concentration to the reaction chamber 5, and a calibration solution discharge unit 87 for discharging the calibration solution C from the reaction chamber 5. The calibration solution C is, for example, sulfuric acid or a sodium hydroxide aqueous solution whose concentration has already been measured. With this configuration, it is possible to easily check at any time whether the measurement accuracy of the water quality measuring device 1 is being appropriately maintained.

[0047] 1, the water quality measuring device 1 includes an antifoaming agent adding device 90 that adds an antifoaming agent Z to the methane fermentation liquor X flowing through the supply line 12. The antifoaming agent adding device 90 supplies the antifoaming agent Z to the downstream side of the supply line 12 relative to the second supply valve 82.

[0048] In the embodiment illustrated in Figure 1, the water quality measuring device 1 further includes a first thermometer 91 provided in the reaction tank 4 to acquire the temperature inside the reaction tank 4, a second thermometer 92 provided in the buffer tank 52 to acquire the temperature inside the buffer tank 52, and a third thermometer 93 provided in the gas supply line 56 to acquire the temperature inside the gas supply line 56.

[0049] In the embodiment illustrated in FIG. 1 , the waste treatment facility 100 includes a water quality measurement system 200 having the water quality measurement device 1 described above, a methane fermentation tank 104, and a circulation line 106. The water quality measurement system 200 further includes a calculation device 203 and an output device 204. The calculation device 203 is electrically connected to the first load cell 24 (p1) and is capable of acquiring the measurement value of the first load cell 24. The calculation device 203 calculates the amount of titrant Y dispensed into the reaction chamber 5 based on a change in the measurement value of the first load cell 24. The calculation device 203 is electrically connected to the pH measurement device 10 (p2) and is capable of acquiring the measurement value of the pH measurement device 10. The calculation device 203 calculates the amount of acid consumption or alkali consumption of the methane fermentation liquid X based on the amount of titrant Y dispensed into the reaction chamber 5 and the measurement value of the pH measurement device. The output device 204 is, for example, a display, and is electrically connected to the calculation device 203 to acquire the calculated values ​​of the calculation device 203. The output device 204 outputs the acid consumption amount or alkali consumption amount of the methane fermentation liquid X calculated by the calculation device 203.

[0050] The calculation device 203 may obtain the temperature inside the reaction tank 4 from the first thermometer 91, and may take this temperature into consideration when calculating the amount of acid or alkali consumed by the methane fermentation liquor X. The calculation device 203 may obtain a measurement value from the second load cell 38, and may take the amount of antifoaming agent Z calculated from the measurement value from the second load cell 38 into consideration when calculating the amount of acid or alkali consumed by the methane fermentation liquor X.

[0051] (Actions and Effects) The operation and effect of the water quality measuring device 1 according to one embodiment will be described. According to one embodiment, methane fermentation liquid X obtained without filtration from the circulation line 106 is supplied to the reaction chamber 5. Then, titrant Y (sulfuric acid and sodium hydroxide aqueous solution, respectively) is dripped onto this methane fermentation liquid X, and the acid consumption and alkali consumption can be measured. Furthermore, by supplying an antifoaming agent Z to the methane fermentation liquid X in the reaction chamber 5, bubbles generated during the dripping of titrant Y and aeration can be broken, and the effects of bubbles, such as leakage of the methane fermentation liquid X due to the generation of a large amount of bubbles, can be suppressed. Therefore, the acid consumption and alkali consumption of the unfiltered methane fermentation liquid X can be measured by titration, and the measurement accuracy of the water quality measuring device 1 can be improved.

[0052] According to one embodiment, the methane fermentation liquid X is aerated by the gas supply unit 50. This promotes the reaction between the methane fermentation liquid X and the titrant Y when the titrant Y is dripped into the methane fermentation liquid X, thereby improving the measurement accuracy of the water quality measuring device 1. Furthermore, when the antifoaming agent Z is supplied to the methane fermentation liquid X, mixing of the methane fermentation liquid X and the antifoaming agent Z is promoted, thereby suppressing the generation of bubbles. Furthermore, the highly viscous methane fermentation liquid X can be stirred. Note that the present disclosure does not limit the method of stirring the methane fermentation liquid X to aeration. Although not shown, in some embodiments, the water quality measuring device 1 includes a rotating body such as a magnetic stirrer provided in the reaction chamber 5, and the methane fermentation liquid X is stirred by this rotating body.

[0053] According to one embodiment, aeration is performed by discharging the gas G from the gas supply hole 55 into the reaction chamber 5, and therefore any aeration, such as full-surface aeration, can be achieved by discharging the gas G from any position in the reaction chamber 5. This further promotes the reaction between the methane fermentation liquid X and the titrant Y, and the mixing of the methane fermentation liquid X and the antifoaming agent Z.

[0054] According to one embodiment, the provision of the buffer tank 52 makes it possible to ensure the amount of gas G required for aeration. Furthermore, the buffer tank 52 is provided with a heating device 64, making it possible to ensure the amount of heated gas G. Furthermore, the liquid phase B separated from the gas G can be stored in the buffer tank 52.

[0055] The humidity of the gas G sucked from the reaction chamber 5 is high, and the moisture contained in the gas G may condense before the gas G is returned to the reaction chamber 5. According to one embodiment, the provision of the buffer tank 52 separates the liquid phase B from the gas G sucked from the reaction chamber 5, thereby making it possible to suppress the occurrence of problems downstream from the buffer tank 52, such as blockage of the gas supply line 56, blockage of the gas valve 58, and failure of the gas pump 60 due to the liquid phase B.

[0056] According to one embodiment, the gas circulation line 68 is provided, so that the gas G flows through a closed system. Therefore, unlike an open system, the gas G is prevented from leaking to the outside, and adverse effects such as a bad odor can be suppressed.

[0057] The measurement value (amount of titrant Y dropped) of the water quality measuring device 1 may be affected by the temperature of the methane fermentation liquid X, and a decrease in the temperature of the reaction chamber 5 may reduce the measurement accuracy of the water quality measuring device 1. According to one embodiment, gas G heated in the buffer tank 52 can be supplied to the reaction chamber 5. Furthermore, heat insulating material 66 is provided in the gas supply line 56 and the gas extraction line 62, thereby suppressing changes in the temperature of the gas G flowing through each of the gas supply line 56 and the gas extraction line 62. This allows the temperature of the reaction chamber 5 to be maintained, and reduces a decrease in the measurement accuracy of the water quality measuring device 1.

[0058] According to one embodiment, the liquid phase B stored in the buffer tank 52 can be discharged to the wastewater tank 70 via the liquid phase discharge line 72. This allows the methane fermentation liquid X and liquid phase B to be treated together. Although not shown, in some embodiments, the water quality measuring device 1 further includes a level sensor that detects the liquid level of the liquid (methane fermentation liquid X + liquid phase B) in the wastewater tank 70, and the wastewater tank 70 is configured to discharge the liquid in the wastewater tank 70 when the detected liquid level exceeds a predetermined height.

[0059] According to one embodiment, the provision of the reaction chamber heat insulator 17 and the reaction chamber heater 19 maintains the temperature of the reaction chamber 5 at a temperature suitable for titration, thereby improving the measurement accuracy of the water quality measuring device 1. Furthermore, because gas G circulates between the reaction tank 4 and the buffer tank 52, the amount of change in the output of the reaction chamber heater 19 and the heater 64 can be reduced. Specifically, there is no need to adjust the output, such as reducing the output in summer and increasing the output in winter. Furthermore, by checking the first thermometer 91, the second thermometer 92, and the third thermometer 93, it is possible to determine whether gas G is being maintained at a constant temperature. If a temperature difference is detected, the output of the reaction chamber heater 19 or the heater 64 can be adjusted to maintain gas G at a constant temperature.

[0060] According to one embodiment, diluting the methane fermentation liquid X with dilution water A reduces the viscosity of the methane fermentation liquid X, making it possible to facilitate stirring of the methane fermentation liquid X. This further promotes the reaction between the methane fermentation liquid X and titrant Y, and the mixing of the methane fermentation liquid X and antifoaming agent Z. Furthermore, diluting the methane fermentation liquid X with dilution water A makes it possible to facilitate the breaking down of bubbles by the antifoaming agent Z.

[0061] According to one embodiment, the defoaming agent nozzle 32 is fitted into the upper wall 4a of the reaction tank 4, so that the defoaming agent Z can be directly sprinkled onto the bubbles that form on the liquid surface of the methane fermentation liquid X in the reaction chamber 5 to break up the bubbles, thereby effectively suppressing the effects of the bubbles.

[0062] According to one embodiment, by applying an oil-based defoaming agent or a surfactant-based defoaming agent, it is possible to realize a defoaming agent Z that has a high effect of breaking down bubbles generated by dropping a titrant Y into a methane fermentation liquid X or aerating the methane fermentation liquid X.

[0063] According to one embodiment, the methane fermentation liquid X in the methane fermentation tank 104 is stirred by the circulation line 106. Then, since the methane fermentation liquid X is obtained from the circulation line 106, it is possible to prevent, for example, the supernatant liquid of the methane fermentation liquid X in the methane fermentation tank 104 or the sludge contained in the methane fermentation liquid X from being obtained in a biased manner, and to evaluate the state of the methane fermentation liquid X.

[0064] According to one embodiment, the antifoaming agent adding device 90 is provided, so that the antifoaming agent Z is added in advance to the methane fermentation liquid X before the titrant Y is dropped or before aeration. Therefore, the generation of bubbles due to the dropping of the titrant Y into the methane fermentation liquid X or the aeration of the methane fermentation liquid X can be suppressed.

[0065] In one embodiment, the water quality measuring device 1 measures the acid consumption and alkali consumption of the methane fermentation liquid X in the methane fermentation tank 104, but the present disclosure is not limited to this form. In some embodiments, the water quality measuring device 1 measures the acid consumption or alkali consumption of the content of a fermentation tank that uses the modified product Wm as a raw material and utilizes the biological action of microorganisms to produce a biogas other than methane as a valuable resource.

[0066] In one embodiment, the sample acquiring device 2 acquires the methane fermentation liquid X from the circulation line 106, but the present disclosure is not limited to this embodiment. Fig. 3 is a diagram schematically showing the configuration of a water quality measurement system 200 according to another embodiment.

[0067] As illustrated in Fig. 3, in another embodiment, a water quality measurement system 200 includes a water quality measurement device 1, a methane fermentation tank 104, and a withdrawal line 202. In the embodiment illustrated in Fig. 3, the water quality measurement device 1 has the same configuration as the water quality measurement device 1 illustrated and described in Fig. 1, except for the sample acquisition device 2, and the same reference numerals as the configuration shown in Fig. 1 are used, and detailed description thereof will be omitted. Furthermore, in the embodiment illustrated in Fig. 3, the methane fermentation tank 104 has the same configuration as the methane fermentation tank 104 illustrated and described in Fig. 1.

[0068] One end of the withdrawal line 202 is connected to the bottom of the methane fermentation tank 104, and the other end is connected to a device (not shown) other than the methane fermentation tank 104. The withdrawal line 202 is configured to be able to withdraw the methane fermentation liquid X from the methane fermentation tank 104, and for example, the methane fermentation liquid X from the methane fermentation tank 104 is withdrawn by opening a valve (not shown) provided on the withdrawal line 202. The methane fermentation liquid X may be withdrawn from the methane fermentation tank 104 periodically or at any timing. For example, the methane fermentation liquid X is withdrawn from the methane fermentation tank 104 once a day.

[0069] In another embodiment, as illustrated in FIG. 3, the sample acquiring device 2 includes a supply line 206 and a pump 208 .

[0070] The supply line 206 connects the withdrawal line 202 and the reaction tank 4. The supply line 206 has a hole diameter of 12.7 mm or more. A pump 208 is provided on the supply line 206. In the embodiment illustrated in FIG. 3 , the sample acquiring device 2 is provided with a supply valve 210 provided on the supply line 206, and when the supply valve 210 is opened and the pump 208 is driven, the methane fermentation liquid X flows through the supply line 206 from the withdrawal line 202 toward the reaction tank 4.

[0071] 3, the acid consumption amount and alkali consumption amount of the methane fermentation liquid X can be measured when the methane fermentation liquid X is extracted from the methane fermentation tank 104. Furthermore, by setting the hole diameter of the supply line 206 to 12.7 mm or more, clogging of the supply line 206 by sludge contained in the methane fermentation liquid X can be prevented.

[0072] The contents described in each of the above embodiments can be understood, for example, as follows.

[0073] [1] The water quality measuring device (1) according to the present disclosure is A water quality measuring device for measuring the acid consumption or alkali consumption of a sample (methane fermentation liquid X) by titration, a sample acquisition device (2) that acquires the sample from a sample supply source (circulation line 106, withdrawal line 202); a reaction tank (4) having a reaction chamber (5) communicating with the sample acquisition device; a dripping unit (6) for dripping a titrant (Y) into the reaction chamber; a defoaming agent supply unit (8) for supplying a defoaming agent (Z) to the reaction chamber; and a pH measuring device (10) that is provided in the reaction chamber and measures the hydrogen ion concentration of the sample.

[0074] According to the configuration described in [1] above, a sample obtained from a sample supply source is supplied to a reaction chamber, and a titrant is dripped onto the sample in the reaction chamber to measure the acid consumption or alkali consumption. Furthermore, by supplying a defoamer to the sample in the reaction chamber, the influence of bubbles generated during dripping of the titrant onto the sample can be suppressed. Therefore, the acid consumption or alkali consumption of the sample can be measured by titration, and the measurement accuracy can be improved.

[0075] [2] In some embodiments, in the configuration described in [1] above, The apparatus further includes a gas supply unit (50) for supplying gas (G) to the sample in the reaction chamber.

[0076] According to the configuration described in [2] above, the sample is stirred, and therefore, when the titrant is dropped onto the sample, the reaction between the sample and the titrant can be promoted. Furthermore, when the antifoaming agent is supplied to the sample, the mixing of the sample and the antifoaming agent can be promoted.

[0077] [3] In some embodiments, in the configuration described in [2] above, the gas supply unit includes at least one gas supply pipe (54) passing through the reaction chamber and through which the gas flows; The at least one gas supply pipe is formed with at least one gas supply hole (55) for allowing the gas to flow into the reaction chamber.

[0078] According to the configuration described in [3] above, it is possible to discharge gas from any position in the reaction chamber, which further promotes the reaction between the sample and the titrant and the mixing of the sample and the defoaming agent.

[0079] [4] In some embodiments, in the configuration described in [2] or [3] above, The gas supply unit includes a gas circulation line (68) that sucks the gas from within the reaction chamber and returns it to the reaction chamber.

[0080] According to the configuration described in [4] above, the gas circulation line allows the gas to circulate in a closed system, which, unlike an open system, prevents the gas from leaking outside and reduces adverse effects such as bad odors.

[0081] [5] In some embodiments, in the configuration described in [4] above, The gas supply section further includes a heating device (64) that heats the gas flowing through the gas circulation line.

[0082] The measurement values ​​of the water quality measuring device may be affected by the temperature of the sample, and a drop in the temperature of the reaction chamber may result in a decrease in measurement accuracy. According to the configuration described in [5] above, gas heated by the heating device is circulated through the reaction chamber, thereby maintaining the temperature of the reaction chamber and preventing a decrease in measurement accuracy.

[0083] [6] In some embodiments, in the configuration described in [5] above, The gas supply unit further includes a gas-liquid separator (buffer tank 52) that separates a liquid phase from the gas flowing through the gas circulation line.

[0084] The humidity of the gas sucked into the reaction chamber is high. According to the configuration described in [5] above, the liquid phase is separated from the gas sucked into the reaction chamber, so that the influence of the liquid phase can be suppressed.

[0085] [7] In some embodiments, in the configuration described in [6] above, The gas-liquid separator includes a buffer tank (52) for storing the gas, The heating device is provided in the buffer tank and heats the gas in the buffer tank.

[0086] According to the configuration described in [7] above, it is possible to ensure the amount of heated gas circulating in the reaction chamber, and also to store the liquid phase separated from the gas in the buffer tank.

[0087] [8] In some embodiments, in the configuration described in [7] above, The gas supply unit further includes a gas pump (60) provided in the gas circulation line for circulating the gas in the buffer tank from the buffer tank to the reaction tank.

[0088] According to the configuration described in [8] above, the gas heated by the heating device can be circulated through the reaction vessel in any amount and for any period of time.

[0089] [9] In some embodiments, in the configuration described in [7] or [8] above, a drainage tank (70) for storing the sample discharged from the reaction tank; The system further includes a liquid phase discharge line (72) that connects the drain tank and the buffer tank.

[0090] According to the configuration described in [7] above, the liquid phase stored in the buffer tank can be discharged to the wastewater tank via the liquid phase discharge line, so that the sample and the liquid phase can be processed together.

[0091]

[10] In some embodiments, in the configuration described in any one of [4] to [9] above, The gas supply unit further includes a heat insulating material (66) that keeps the gas flowing through the gas circulation line warm.

[0092] According to the configuration described in

[10] above, the heat insulating material suppresses changes in the temperature of the gas flowing through the gas circulation line, thereby maintaining the temperature of the reaction chamber and suppressing a decrease in measurement accuracy.

[0093]

[11] In some embodiments, in the configuration according to any one of [1] to

[10] above, The reaction chamber further includes at least one of a reaction chamber heat insulating material (17) for keeping the reaction chamber warm and a reaction chamber heating device (19) for heating the reaction chamber.

[0094] According to the configuration described in

[11] above, the temperature of the reaction chamber can be maintained at a temperature suitable for titration, thereby improving measurement accuracy.

[0095]

[12] In some embodiments, in the configuration according to any one of [1] to

[11] above, The apparatus further includes a dilution section (14) for supplying dilution water (A) to the reaction chamber.

[0096] According to the configuration described in

[12] above, the viscosity of the sample can be reduced, facilitating stirring of the sample, thereby further promoting the reaction between the sample and the titrant and the mixing of the sample with the defoaming agent.

[0097]

[13] In some embodiments, in the configuration described in any one of [1] to

[12] above, The defoaming agent supply unit is provided at the top of the reaction vessel and includes a defoaming agent nozzle (32) that sprays the defoaming agent from above the sample in the reaction chamber.

[0098] According to the configuration described in

[13] above, the bubbles that form on the upper surface of the sample in the reaction chamber can be broken by directly sprinkling the antifoaming agent on the bubbles, thereby effectively suppressing the influence of the bubbles.

[0099]

[14] In some embodiments, in the configuration according to any one of [1] to

[13] above, The antifoaming agent is an oil-based antifoaming agent or a surfactant-based antifoaming agent.

[0100] According to the configuration described in

[14] above, a defoaming agent with a high foam breaking effect can be realized.

[0101]

[15] In some embodiments, in the configuration according to any one of [1] to

[14] above, The reaction system further includes a thermometer (91) that is provided in the reaction tank and measures the temperature inside the reaction tank.

[0102] According to the configuration described in

[15] above, it is possible to check whether the temperature inside the reaction chamber is being maintained at a constant temperature. If the temperature inside the reaction chamber is not being maintained at a constant temperature, a process to maintain the temperature inside the reaction chamber at a constant temperature is quickly carried out, thereby realizing good temperature conditions.

[0103]

[16] In some embodiments, in the configuration according to any one of [1] to

[15] above, The apparatus further includes a level sensor (15) for detecting the liquid level of the sample in the reaction chamber.

[0104] According to the configuration described in

[16] above, the amount of sample in the reaction chamber can be easily adjusted, and any amount of sample can be easily prepared.

[0105]

[17] In some embodiments, in the configuration described in

[16] above, a quantitative adjustment line (21) connected to the reaction tank; The quantitative adjustment line is configured to be able to switch whether or not to discharge the sample from the reaction chamber when the liquid level of the sample in the reaction chamber exceeds a predetermined height.

[0106] According to the configuration described in

[17] above, the quantitative adjustment line can adjust the amount of sample in the reaction chamber to a predetermined amount so that the liquid level of the sample reaches a predetermined height. This makes it easy to prepare a quantitative amount of sample.

[0107]

[18] In some embodiments, in the configuration according to any one of [1] to

[17] above, The reaction tank has an overflow port (4e) formed in the side wall, located above the pH measuring device.

[0108] According to the configuration described in

[18] above, the sample in the reaction chamber can be discharged from the reaction tank through the overflow port before the sample overflows the reaction tank.

[0109]

[19] In some embodiments, in the configuration according to any one of [1] to

[18] above, a calibration solution supply unit (85) for supplying a calibration solution having a known concentration to the reaction chamber; The apparatus further includes a calibration solution discharge section (87) for discharging the calibration solution from the reaction chamber.

[0110] According to the configuration described in

[19] above, calibration liquid is supplied to and discharged from the reaction chamber, so that it is possible to easily check at any time whether the measurement accuracy of the water quality measuring device is being properly maintained.

[0111]

[20] In some embodiments, in the configuration according to any one of [1] to

[19] above, The dropping portion is a titrant reservoir (16) in which the titrant is stored; a drip nozzle (18) fitted into the reaction vessel; a titrant line (20) connecting the titrant reservoir and the dropping nozzle; and a titrant pump (22) provided in the titrant line.

[0112] According to the configuration described in

[20] above, it is possible to realize the dropping of the titrant into the reaction chamber.

[0113]

[21] In some embodiments, in the configuration described in

[20] above, The dropping unit further includes a weight measuring device (24) for measuring the weight of the titrant reservoir.

[0114] According to the configuration described in

[21] above, the amount of titrant Y dropped into the reaction chamber can be easily calculated by obtaining the measurement value of the weight measuring device.

[0115]

[22] In some embodiments, in the configuration described in

[20] or

[21] above, The dropping portion is a tray (26) disposed below the titrant pump for receiving the titrant leaking from the titrant pump; and a liquid leakage sensor (28) for detecting the titrant liquid in the tray.

[0116] According to the configuration described in

[22] above, leakage of the titrant from the titrant pump can be quickly detected.

[0117]

[23] In some embodiments, in the configuration according to any one of [1] to

[22] above, The reaction vessel includes a discharge port (4g) formed in a bottom wall (4f), The bottom surface of the lower wall facing the reaction chamber is inclined downward as it approaches the outlet.

[0118] According to the configuration described in

[23] above, the sample can be smoothly discharged from the reaction chamber.

[0119]

[24] In some embodiments, the water quality measurement system comprises: The water quality measuring device according to any one of [1] to

[23] above, a fermenter (methane fermenter 104) that converts a modified material (Wm) obtained by hydrolyzing the waste (W) into lower molecular weight compounds using microorganisms, the fermenter being the supply source; a circulation line (106) for removing the content of the fermenter (methane fermentation liquid X) from the fermenter and returning it to the fermenter; The sample acquisition device includes a supply line (12) connecting the circulation line and the reaction vessel, through which the contents of the fermenter flowing through the circulation line flow toward the reaction vessel.

[0120] According to the configuration described in

[24] above, the contents of the fermenter are collected as a sample from the circulation line, which prevents the contents from being unevenly distributed and allows the state of the contents of the fermenter to be evaluated.

[0121]

[25] In some embodiments, the water quality measurement system includes: The water quality measuring device according to any one of [1] to

[23] above, a fermenter that is a supply source and that converts modified waste into low molecular weight substances using microorganisms; a withdrawal line (202) connected to the bottom of the fermenter and capable of withdrawing the contents of the fermenter; The sample acquisition device a supply line (206) connecting the withdrawal line and the reaction vessel; a pump (208) in the supply line for pumping the contents of the fermenter through the withdrawal line to the reactor.

[0122] According to the configuration described in

[25] above, when the contents of the fermenter are extracted from the fermenter, the acid consumption or alkali consumption of the contents can be measured.

[0123]

[26] In some embodiments, in the configuration described in

[25] above, The supply line has a hole diameter of 12.7 mm or more.

[0124] According to the configuration described in

[26] above, by making the hole diameter of the supply line 12.7 mm or more, clogging of the supply line by the contents of the fermenter can be prevented.

[0125]

[27] In some embodiments, in the configuration according to any one of

[24] to

[26] above, The water quality measuring device includes an antifoaming agent adding device (90) that adds the antifoaming agent to the sample flowing through the supply line.

[0126] According to the configuration described in

[27] above, by adding an antifoaming agent to the sample before adding the titrant to the sample, it is possible to suppress the generation of bubbles during titration.

[0127]

[28] In some embodiments, in the configuration according to any one of

[24] to

[27] above, The apparatus further includes a calculation device (203) that calculates the amount of acid or alkali consumed by the sample based on the amount of the titrant dropped into the reaction chamber and the measurement value of the pH measurement device.

[0128] According to the configuration described in

[28] above, the acid consumption or alkali consumption of the sample can be automatically calculated.

[0129]

[29] In some embodiments, in the configuration described in

[28] above, The apparatus further includes an output device (204) that outputs the acid consumption or alkali consumption of the sample calculated by the calculation device.

[0130] According to the configuration described in

[29] above, the amount of acid or alkali consumed by the sample can be quickly determined. [Explanation of symbols]

[0131] 1 Water quality measuring device 2. Sample acquisition device 4 Reactor 4a Wall 4b Gas outlet 4c 1st side wall 4d 2nd side wall 4e Overflow mouth 4th floor lower wall 4g outlet 5. Reaction chamber 6 Dripping part 6A 1st dripping part 6B 2nd dripping section 8. Defoamer supply section 10 pH measuring device 12 Supply Line 13 Supply valve 14 Dilution section 15 Level sensor 16 Titrant reservoir 17 Reaction chamber insulation material 18 Dripping nozzle 19 Reaction chamber heating device 20 Titrant Line 21 Quantitative Adjustment Line 22 Titrant pump 24 First Load Cell 26 First Receptacle 28 First leak sensor 30 Defoamer storage tank 32 Defoamer nozzle 34 Defoamer Line 36 Antifoam pump 38 Second Load Cell 40 Second Receptacle 42 Second leak sensor 50 Gas supply unit 52 Buffer tank 54 Gas supply pipe 55 Gas supply hole 56 Gas supply line 58 Gas Valve 60 Gas Pump 62 Gas extraction line 64 Heating device 66 Heat insulation material 68 Gas Circulation Line 70 Drain tank 72 Liquid phase discharge line 73 Liquid phase discharge valve 74 First Line 75 First valve 78 Second Line 80 Third Line 81 Third valve 82 Second supply valve 85 Calibration liquid supply section 86 Air Line 87 Calibration liquid discharge part 88 Air Valve 90 Antifoaming agent adding device 91 1st thermometer 92 2nd thermometer 93 Third thermometer 100 Waste treatment facilities 102 Reformer 104 Methane fermentation tank 104a Methane fermentation liquid outlet 104b Methane fermentation liquid return port 106 Circulation Line 200 Water Quality Measurement System 202 Pulling Line 203 Calculation Device 204 Output Device 206 Supply Line 208 Pump 210 Supply Valve A Dilution water B liquid phase D1 One direction D2 Cross direction G Gas W waste Wm modified product X Methane fermentation liquid Y titrant Z Antifoaming Agent

Claims

1. A water quality measuring device for measuring the acid consumption or alkali consumption of a sample by titration, a sample acquisition device for acquiring the sample from the sample source; a reaction vessel having a reaction chamber in communication with the sample acquiring device; a dripping section for dripping a titrant into the reaction chamber; a defoaming agent supply unit for supplying a defoaming agent to the reaction chamber; a pH measuring device provided in the reaction chamber and configured to measure the hydrogen ion concentration of the sample; Water quality measuring device.

2. Further comprising a gas supply unit for circulating gas through the sample in the reaction chamber. The water quality measuring device according to claim 1 .

3. the gas supply unit includes at least one gas supply pipe passing through the reaction chamber and through which the gas flows; the at least one gas supply pipe is formed with at least one gas supply hole through which the gas flows into the reaction chamber; The water quality measuring device according to claim 2.

4. the gas supply unit includes a gas circulation line that sucks the gas from within the reaction chamber and returns it to the reaction chamber; The water quality measuring device according to claim 2 or 3.

5. The gas supply unit further includes a heating device that heats the gas circulating through the gas circulation line. The water quality measuring device according to claim 4.

6. The gas supply unit further includes a gas-liquid separator that separates a liquid phase from the gas circulating through the gas circulation line. The water quality measuring device according to claim 5.

7. the gas-liquid separator includes a buffer tank that stores the gas, the heating device is provided in the buffer tank and heats the gas in the buffer tank; The water quality measuring device according to claim 6.

8. the gas supply unit further includes a gas pump provided in the gas circulation line for circulating the gas in the buffer tank from the buffer tank to the reaction tank. The water quality measuring device according to claim 7.

9. a drainage tank for storing the sample discharged from the reaction tank; Further provided is a liquid phase discharge line communicating between the drainage tank and the buffer tank. The water quality measuring device according to claim 7.

10. The gas supply unit further includes a heat insulating material that keeps the gas circulating through the gas circulation line warm. The water quality measuring device according to claim 4.

11. The reaction chamber may further include at least one of a reaction chamber heat insulating material that keeps the reaction chamber warm and a reaction chamber heating device that heats the reaction chamber. The water quality measuring device according to any one of claims 1 to 3.

12. Further comprising a dilution unit for supplying dilution water to the reaction chamber. The water quality measuring device according to any one of claims 1 to 3.

13. the defoaming agent supply unit is provided at an upper portion of the reaction tank and includes a defoaming agent nozzle that sprays the defoaming agent from above the sample in the reaction chamber. The water quality measuring device according to any one of claims 1 to 3.

14. The defoaming agent is an oil-based defoaming agent or a surfactant-based defoaming agent. The water quality measuring device according to any one of claims 1 to 3.

15. Further, a thermometer is provided in the reaction tank to acquire the temperature inside the reaction tank. The water quality measuring device according to any one of claims 1 to 3.

16. further comprising a level sensor for detecting the liquid level of the sample in the reaction chamber; The water quality measuring device according to any one of claims 1 to 3.

17. Further provided is a quantitative adjustment line connected to the reaction vessel, the quantitative adjustment line is configured to be able to switch whether or not to discharge the sample from the reaction chamber when the liquid level of the sample in the reaction chamber exceeds a predetermined height. The water quality measuring device according to claim 16.

18. The reaction tank has an overflow port formed in a side wall thereof, the overflow port being located above the pH measuring device. The water quality measuring device according to any one of claims 1 to 3.

19. a calibration solution supply unit for supplying a calibration solution having a known concentration to the reaction chamber; a calibration solution discharge unit for discharging the calibration solution from the reaction chamber, The water quality measuring device according to any one of claims 1 to 3.

20. The dropping portion is a titration liquid reservoir tank in which the titration liquid is stored; a dripping nozzle fitted into the reaction vessel; a titration liquid line connecting the titration liquid reservoir tank and the dropping nozzle; a titrant pump provided in the titrant line; The water quality measuring device according to any one of claims 1 to 3.

21. the dropping unit further includes a weight measuring device that measures the weight of the titrant reservoir; The water quality measuring device according to claim 20.

22. The dropping portion is a tray disposed below the titrant pump to receive the titrant leaking from the titrant pump; a liquid leakage sensor that detects the titration liquid in the tray. The water quality measuring device according to claim 20.

23. the reaction vessel includes a discharge port formed in a bottom wall; a bottom surface of the lower wall facing the reaction chamber is inclined downward as it approaches the outlet; The water quality measuring device according to any one of claims 1 to 3.

24. The water quality measuring device according to any one of claims 1 to 3; a fermenter that is a supply source and that converts modified waste into low molecular weight substances using microorganisms; a circulation line for removing the contents of the fermenter to the outside and returning them to the fermenter; the sample acquisition device includes a supply line connecting the circulation line and the reaction tank, through which the contents of the fermentation tank circulating through the circulation line flow toward the reaction tank; Water quality measurement system.

25. The water quality measuring device according to any one of claims 1 to 3; a fermenter that is a supply source and that converts modified waste into low molecular weight substances using microorganisms; a withdrawal line connected to the bottom of the fermenter and capable of withdrawing the contents of the fermenter; The sample acquisition device a supply line connecting the withdrawal line and the reaction vessel; a pump provided in the supply line for distributing the contents of the fermenter through the withdrawal line to the reaction vessel; Water quality measurement system.

26. The supply line has a hole diameter of 12.7 mm or more.

26. The water quality measurement system of claim 25.

27. the water quality measuring device includes a defoaming agent adding device that adds the defoaming agent to the sample flowing through the supply line; 25. The water quality measurement system of claim 24.

28. a calculation device that calculates an acid consumption amount or an alkali consumption amount of the sample based on the amount of the titrant dropped into the reaction chamber and the measurement value of the pH measuring device, 25. The water quality measurement system of claim 24.

29. an output device that outputs the acid consumption or alkali consumption of the sample calculated by the calculation device; 29. The water quality measurement system of claim 28.

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