KR102479117B1 - Sludge Weight Measuring Method, Measurer and a Settling Tank Using the Same - Google Patents

Abstract

The present invention relates to a method and apparatus for measuring the amount of sludge in a sedimentation tank, and a sedimentation tank to which the same is applied. The sedimentation tank includes a base 10 supported by the ground; A plurality of support pillars 31 whose lower ends are supported by the base 10 and extend upward; and an upper tank 40 in which loads are supported by the plurality of support pillars 31 or support walls and supplied with muddy water SW, which is a mixture of sludge and water, from a muddy water supply unit 70. The measuring device includes a sensor 60 generating a signal proportional to a load applied to the support column 31 by the upper tank 40; and a calculation unit 80 that calculates the weight of the sludge S included in the muddy water SW in the muddy water SW filled in the upper tank 40 based on the signal generated by the sensor 60. ); The measurement method is based on the change in the length of the support column 31 calculated from the signal of the sensor 60 during operation of the sedimentation tank and the change in length of the support column 31 per unit weight of the sludge contained in the sedimentation tank, The weight of the sludge (S) is derived. The measurement method is to subtract the weight (W1) of the sedimentation tank full of fresh water from the weight (W2) of the sedimentation tank full of muddy water, multiply the specific gravity (Bs) of the sludge, and calculate the ratio of the specific gravity (Bs) of the sludge and water By dividing the difference in specific gravity (Bw), the weight of the sludge (S) in the settling tank is calculated.

Description

Sludge Weight Measuring Method, Measurer and a Settling Tank Using the Same}

The present invention relates to a method and apparatus for measuring the amount of sludge in a sedimentation tank, and a sedimentation tank to which the same is applied.

Generally, sand is used in the manufacture of concrete. As such, the sand needed for the construction industry was mainly collected from the river bed. And as the sand that can be collected from rivers is depleted, the amount of sand collected from the sea and used after desalination has increased. However, fishermen's concerns have grown that these fish resources may be damaged and depleted if sand is collected from the seabed, as the seabed is rich in nutrients and is the basis for fish stocks where fish reefs are formed. Eventually, as the amount of sand collected from the sea increased, the fishermen's opposition intensified, and the government and local governments banned sand from the sea.

Accordingly, sand is currently procured by crushing wind rock or river rock to make sand. If the raw rock for sand production is clean and free of moisture, a dry process (sand sand removal) in which the rock is crushed, the sand particles are sorted, and then the soil or fine particles contained in the sand particles are removed by a dust collection facility using wind and a bag filter. manufacturing) equipment is available. However, since it is very difficult to obtain rocks without moisture in the natural state, the rocks collected in the natural state have no choice but to contain considerable moisture. It was inevitably reduced in quality.

Accordingly, a wet sand manufacturing facility that crushes wind rock or river rock to the size of sand and removes soil components by washing it with water has become a major source of sand. Wet milling facilities crush rocks to the size of sand and wash them with water, and a large amount of turbid water generated in the sand washing process is treated as wastewater and reused.

Such wastewater treatment facilities include a settling tank in which turbid water is left for a long time to precipitate or precipitated using a coagulant, and a fresh water tank in which fresh water to be used in the silk-making process is temporarily stored. The sludge precipitated in the sedimentation tank is sucked in by the pump and dehydrated in the filter press to be discharged in the form of cake.

Measuring the amount of sludge precipitated in the settling tank is very important for efficient operation of the facility. For example, if the equipment operator does not measure the amount of sludge, the suction and discharge of the sludge settled in the sedimentation tank cannot proceed smoothly. In addition, if the sludge is left in the sedimentation tank for a long time, the sludge hardens and solidifies. When the sludge is solidified, it is necessary to stop the equipment and carry out cumbersome maintenance work of softening and piercing the solidified sludge.

However, since the capacity of the sedimentation tank reached at least several hundred tons, the side walls of the sedimentation tank were made of metal plates, and the tank was always filled with water during operation, the amount of settled sludge could not be visually confirmed.

The present invention has been made to solve the above problems, without changing the equipment of the settling tank, installing a simple measuring device and calculating the amount of sludge inside the large settling tank filled with turbid water with a simple principle. It is an object of the present invention to provide a method for measuring the amount of sludge and a sedimentation tank using the same.

The sludge amount measuring device and measuring method of the present invention for solving the above problems include a base 10 supported by the ground; A plurality of support pillars 31 or support walls whose lower ends are supported by the base 10 and extend upward; A load may be applied to a sedimentation tank including an upper tank 40 supported by the plurality of support pillars 31 or support walls and supplied with muddy water (SW), which is a mixture of sludge and water, from a muddy water supply unit 70. .

A ring-shaped support ring 32 connecting the plurality of support pillars 31 is provided at the upper end of the plurality of support pillars 31, and the upper tank 40 is mounted on the support ring 32. can be supported.

At the lower end of the upper tank 40, a lower discharge port 45 for discharging the sludge S precipitated in the upper tank 40 may be provided.

A ditch 42 may be provided around the upper end of the upper tank 40 to discharge fresh water W exceeding the water level at the upper end of the upper tank 40 .

The upper tank 40 may be continuously supplied with muddy water SW from the muddy water supply unit 70, and may be in a state full of muddy water SW.

A suction nozzle 50 is installed at the lower discharge port 45, and the suction nozzle 50 may be connected to the pump 52 through a suction pipe 51.

The pump 52 may supply the sludge S sucked from the suction nozzle 50 to the filter press 53 .

The filter press 53 may dehydrate the sludge (S) and discharge it in the form of a block.

A fresh water pipe 43 may be provided in the trench 42 to discharge the fresh water W passed into the trench 42 beyond the upper level of the upper tank 40 .

The fresh water pipe 43 may supply the fresh water W to the lower tank 20 .

The lower tank 20 may be installed on the base 10 and provided below the upper tank 40 .

The measuring device includes a sensor 60 provided on the support pillar 31 or the support wall and generating a signal proportional to a load applied to the support pillar 31 or the support wall by the upper tank 40; and a calculation unit 80 that calculates the weight of the sludge S included in the muddy water SW in the muddy water SW filled in the upper tank 40 based on the signal generated by the sensor 60. );

The sensor 60 may be attached to a side surface of the support pillar 31 or the support wall to detect a change in length of the support pillar 31 or the support wall and generate a signal.

The sensor 60 may be a thin film strain sensor.

The sensors 60 may be installed at two or more locations on the plurality of support pillars 31 or the support wall.

The calculator 80 may calculate the weight of the sludge S based on an average value of signals generated by the plurality of sensors 60 .

The measuring device may further include a display 90 displaying the amount of the sludge S calculated by the calculator 80.

The method for measuring the amount of sludge according to the present invention may include a zero point setting step of setting the signal generated by the sensor 60 as a zero signal when the upper tank 40 is filled with fresh water W. .

In the zero point setting step, the zero point signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

The method for measuring the amount of sludge is to put sludge (S) of a predetermined weight (Ws) into the upper tank (40) filled with fresh water (W), and measure the measurement signal generated by the sensor (60) and the predetermined A scaling step of associating the weight Ws may be further included.

The sludge (S) introduced in the scaling step may be supplied from the filter press (53) that dehydrates the sludge (S) discharged from the upper tank (40).

In the scaling step, the measurement signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

The sludge amount measurement method is based on the measurement signal of the sensor 60 generated while operating the facility and the scaled value in the scaling step Weight for calculating the amount of sludge (S) in the upper tank 40 A calculation step may be further included.

The method for measuring the amount of sludge is to multiply the difference between the weight (W2) calculated from the measurement signal generated by the current sensor 60 and the weight (W1) calculated from the zero point signal by the specific gravity (Bs) of the sludge, A weight calculation step of calculating the weight of the sludge (S) contained in the upper tank (40) by dividing the difference between the specific gravity (Bs) of and the specific gravity (Bw) of water may be further included.

In the weight calculation step, the measurement signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

The calculation unit 80 may set a signal generated by the sensor 60 as a zero signal when the upper tank 40 is filled with fresh water W.

The calculator 80 receives a user input for setting the signal generated by the sensor 60 as a zero signal in a state in which the fresh water W is full, and the upper tank full of the fresh water W ( 40) may include an input unit 81 for receiving a predetermined weight (Ws) value of the sludge (S) input.

The calculation unit 80 is a measurement signal generated by the sensor 60 in a state in which the sludge S of the predetermined weight Ws is put into the upper tank 40 filled with fresh water W, The signal generated by the sensor 60 may be correlated with the weight of the sludge S by corresponding to the predetermined weight Ws of the sludge S.

The calculation unit 80 multiplies the difference between the weight W2 calculated from the measurement signal generated by the current sensor 60 and the weight W1 calculated from the zero point signal by the specific gravity Bs of the sludge, The weight of the sludge (S) in the upper tank (40) can be calculated by dividing the difference between the specific gravity (Bs) of sludge and the specific gravity (Bw) of water.

On the other hand, when the upper water level of the sedimentation tank is lower than the highest water level of the sedimentation tank described above (that is, the water level at which fresh water overflows into the ditch), the weight of fresh water reduced according to the decrease in water level is changed to a zero signal and input, so that the sludge in the sedimentation tank Weight can also be calculated.

For example, even when muddy water is not supplied from the muddy water supply unit 70 because the crushing operation is stopped, the work of supplying the sludge S to the filter press 53 through the suction nozzle 50 in the settling tank can continue. In this working situation, the water level in the sedimentation tank is gradually lowered. In this case, if the weight when the fresh water is filled to the lowered level is changed into a zero signal and input, the weight of the sludge (S) can be calculated according to the same principle as described above.

The weight of fresh water when the fresh water is filled up to the lowered water level can be easily calculated by measuring the lowered water level because the internal volume and shape of the sedimentation tank are known. Accordingly, a water level sensor may be further provided in the sedimentation tank.

In addition, the lowered water level may be derived by measuring the flow rate of the sludge (S) discharged from the suction nozzle 50 using a flow sensor or the like.

In addition to this, it is also possible to check the water level visually by displaying a scale indicating the water level at the top of the settling tank. The water level visually confirmed in this way may be manually input through the input unit 81 .

The method for measuring the amount of sludge in a settling tank according to the present invention has an advantage in that it can be applied by simply installing a measuring device without changing the existing settling tank equipment at all.

The method for measuring the amount of sludge in the sedimentation tank of the present invention has the advantage that it can be applied using a simple principle by simply installing a measuring device even for existing sedimentation tank facilities of different specifications.

The method for measuring the amount of sludge in a settling tank according to the present invention can be implemented only by processing a simple sensor and a signal of the sensor with a simple algorithm, without the need for an expensive and complicated measuring device.

The method for measuring the amount of sludge in a settling tank of the present invention can measure the weight of sludge inside a large settling tank filled with turbid water with a simple measuring device and measuring method, thereby preventing the sticking of sludge in the settling tank in advance, very useful for the operation of

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a view showing the base of the sedimentation tank of the embodiment, FIG. 2 is a view with a support column added to FIG. 1, FIG. 3 is a view with a support ring added to FIG. 2, and FIG. 4 is a view with a lower tank added to FIG. , FIG. 5 is a view in which an upper tank is added to FIG. 4, and FIG. 6 is a view in which a fresh water pipe, a suction nozzle, a suction pipe, and a sensor are added to FIG.
7 is a view showing the operation state of the sedimentation tank to which the measurement device of the embodiment is applied, using the front cross section of FIG. 6.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is not limited to the embodiments disclosed below, and various changes may be applied and may be implemented in various different forms. Only this embodiment is provided to complete the disclosure of the present invention and to fully inform those skilled in the art of the scope of the invention. Therefore, the present invention is not limited to the embodiments disclosed below, but all changes and equivalents included in the technical spirit and scope of the present invention as well as substitution or addition of the configuration of one embodiment and the configuration of another embodiment each other to substitutes.

The accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and technical scope of the present invention are included. It should be understood to include water or substitutes. In the drawings, components may be exaggeratedly large or small in size or thickness in consideration of convenience of understanding, etc., but due to this, the scope of protection of the present invention should not be construed as being limited.

Terms used in this specification are only used to describe specific implementations or examples, and are not intended to limit the present invention. And expressions in the singular include plural expressions unless the context clearly dictates otherwise. In the specification, terms such as "comprise" and "consist of" are intended to designate that features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist. That is, in the specification, terms such as ~ include, ~ consist of, etc. It should be understood that it does not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

When an element is referred to as being “on top” or “under” another element, it should be understood that other elements may exist in the middle as well as being directly above the other element. .

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

[sedimentation tank]

A large amount of turbid water (SW) generated in the process of obtaining sand by crushing rocks in a wet method contains sludge (S) containing particles fine enough to pass through the dewatering screen. The muddy water (SW) is continuously supplied to the settling tank, and the muddy water (SW) supplied to the settling tank maintains a calm atmosphere to induce precipitation of the sludge (S). If the capacity of the sedimentation tank is very large compared to the amount of turbid water (SW) supplied, the turbid water (SW) can maintain a calm atmosphere.

The sludge (S) sinking by its own weight is discharged through a discharge port provided at the bottom of the settling tank, and the fresh water in which the sludge (S) is precipitated is discharged to the fresh water tank beyond the settling tank.

The sludge amount (weight) measurement method of the embodiment and the measuring device for applying the sludge amount are installed in the settling tank.

Since the sedimentation tank has an accommodating capacity of hundreds of tons of turbid water, the sedimentation tank is installed on a predetermined base 10. The base 10 may be a flat foundation supported by the ground. The sedimentation tank may not be directly placed on the surface of the base 10, but may be installed upwardly spaced apart from the base 10 by a predetermined distance. That is, the sedimentation tank itself may be installed in a form floating in the air.

To install the sedimentation tank in this way, a support structure 30 is installed on the base 10. The support structure 30 includes a plurality of support pillars 31 whose lower ends are supported by the base 10 and extend upward. A plurality of the support pillars 31 may be installed at predetermined intervals along the circumference of the sedimentation tank. In the embodiment, a structure in which 12 support pillars 31 are arranged at intervals of 30 degrees is exemplified, but the interval and number are not necessarily limited thereto.

The support pillar 31 may be, for example, a section steel. In the embodiment, a structure in which a support pillar 31 is installed in a form in which an H-beam is erected is exemplified. However, the support column 31 is not necessarily limited to H-beams.

A ring-shaped support ring 32 connecting the plurality of support pillars 31 may be installed at an upper end of the support pillar 31 . The upper tank 40 constituting the sedimentation tank is seated on the support ring 32. A portion of the support ring 32 in contact with the upper tank 40 has a shape complementary to that of the sedimentation tank, thereby minimizing a phenomenon in which loads are concentrated on a portion of the upper tank 40. In addition, the support ring 32 evenly distributes the load of the upper tank 40 to the plurality of support pillars 31 .

During operation of the sedimentation tank, the upper tank 40 is continuously supplied with muddy water SW from the muddy water supply unit 70 . The upper tank 40 includes an upper side wall 41 for securing a flat cross-sectional area and an inclined side wall 44 connected to a lower portion of the upper side wall 41 to induce downward sedimentation of sludge. The upper side wall 41 may have a cylindrical shape, and the inclined side wall 44 may have a funnel shape. In order to promote the downward movement of the sludge (S), the inclined side wall 44 is connected to a first inclined side wall 441 having a first inclined angle and a lower portion of the first inclined side wall 441, A second inclined side wall 442 having an inclined angle steeper than the first inclined angle may be included.

At the lower end of the inclined side wall 44, a lower discharge port 45 is provided for discharging the sludge S that settles down along the inclined side wall 44.

A suction nozzle 50 connected to a pump 52 generating a suction force is installed in the lower discharge port 45, and the suction nozzle 50 is connected to the pump 52 through a suction pipe 51. The pump 52 sucks sludge S from the upper tank 40 through the suction nozzle 50 and supplies it to the filter press 53 .

The filter press 53 dehydrates and compresses the sludge S, and discharges it in the form of a block. The sludge block discharged from the filter press 53 can be discarded.

A ditch 42 may be provided around an upper end of the upper side wall 41 of the upper tank 40 to discharge fresh water W exceeding the water level at the upper end of the upper tank 40 . The trench 42 is provided in a closed loop form, and collects fresh water (W) overflowing at an arbitrary position along the circumference of the upper tank 40 and discharges it to the fresh water pipe 43. In the embodiment, a structure in which eight fresh water pipes 43 are arranged at 45 degree intervals along the circumference of the trench 42 is exemplified, but the interval and number are not necessarily limited thereto.

The fresh water moving by its own weight along the fresh water pipe 43 in the trench 42 is supplied to the fresh water tank. The fresh water tank may be disposed at a lower position than the trench 42 . According to the embodiment, the fresh water tank may be composed of a lower tank 20 provided on the upper part of the base 10. A space provided below the funnel-shaped upper tank 40 may be an empty space. Considering that the size of the sedimentation tank is usually more than 10 meters in diameter, the lower space of the sedimentation tank occupies a considerable volume. According to the embodiment, it is possible to minimize the space occupied by the sedimentation tank and the fresh water tank by arranging the lower tank 20 in such a space.

In addition, the fresh water tank is also operated in a form filled with fresh water. As shown, when the lower tank 20 is placed under the upper tank 40, the volume of the upper tank 40 submerged in the fresh water filled in the lower tank 20 Since the buoyancy acts on the upper tank 40 as much as possible, the load applied to the support structure 30 by the upper tank 40 can be alleviated to some extent.

When calculating the amount of sludge to be described later, it may be calculated by incorporating such buoyancy into the calculation formula. For example, the water level of the fresh water tank may also decrease depending on the operation type of the facility. When the level of fresh water is reduced, the buoyancy force acting on the upper tank 40 is reduced. Therefore, the fresh water tank may also measure the water level using a water level sensor or a water level scale, and accordingly, the increased or decreased buoyancy may be reflected in the sludge amount calculation process to be described later.

Describing the operation of the sedimentation tank, the muddy water (SW) supplied from the muddy water supply unit 70 is continuously introduced into the upper tank 40. The volume of the upper tank 40 is significantly larger than the amount of turbid water (SW) supplied. Therefore, even if turbid water (SW) is introduced, the sedimentation tank maintains a calm state. Then, the heavy sludge (S) mixed with the muddy water (SW) (the specific gravity of the sludge resulting from rock crushing may be approximately 2.4 to 2.8) sinks to the bottom of the upper tank 40, and relatively light fresh water ( W) moves to the surface.

The upper tank 40 is already filled with muddy water (SW). Therefore, as the muddy water (SW) is supplied from the muddy water supply unit 70, the fresh water (W) on the surface is introduced into the trench (42) beyond the highest water level of the upper tank (40). And the fresh water W introduced into the trench 42 moves along the fresh water pipe 43 and is supplied to the fresh water tank.

The sludge (S) that has sunk to the bottom further descends along the inclined side wall 44 and moves to the lower discharge port 45 provided at the lower end of the inclined side wall 44 . When the sludge (S) precipitated on the inclined side wall 44 is left for a long time, a phenomenon occurs that it hardens like mud. Therefore, the sludge (S) must be periodically discharged before it hardens.

At the site of one embodiment, the amount of water and the amount of sludge in muddy water (SW) may be approximately 9:1.

The sludge S that has settled to the bottom of the settling tank may be sucked in by the pump 52 every 30 minutes and discharged from the settling tank. A cycle in which the filter press 53 generates and discharges sludge blocks may be approximately 30 minutes, and a cycle in which sludge (S) is discharged from the settling tank may be adjusted accordingly.

[Sludge amount measuring device]

The amount of sludge (S) contained in the sedimentation tank full of muddy water (SW), that is, the upper tank 40, can be derived in a simple way from a measuring device installed in the sedimentation tank.

The measuring device is a sensor 60 installed on the support column 31, and the weight of the sludge (S) contained in the muddy water (SW) contained in the upper tank 40 from the signal generated by the sensor 60 It includes a calculation unit 80 that calculates.

The sensor 60 may be a thin-film strain sensor installed in such a way as to be attached to the side surface of the support pillar 31, or a traditional piezoelectric element sensor installed between the upper and lower surfaces of the pillar cut by cutting it. The thin-film strain sensor is a sensor that generates a signal corresponding to minute strain. When the load applied to the support column 31 increases due to the increase in the load of the upper tank 40, the support column 31 is compressed in the longitudinal direction and the length may be slightly reduced. The thin-film strain sensor deforms in response to minute changes in the length of the support column 31 and can generate a signal corresponding to the amount of deformation.

One or more of the sensors 60 may be installed. The sensor 60 may be installed on any one of the plurality of support pillars 31 or may be installed on two or more support pillars 31, respectively. In the embodiment, a structure in which one sensor 60 is installed on three support pillars 31 arranged at 120 degree intervals among 12 support pillars 31 is illustrated. However, the installation location of the sensor 60 need not be limited thereto. The sensor 60 may be installed at a position higher than the highest water level in the fresh water tank.

The sensor 60 may be connected to the calculation unit 80 to enable signal transmission and reception.

In order to increase accuracy, the calculator 80 may calculate the weight of the sludge S based on an average value of signals generated by the plurality of sensors 60.

Meanwhile, the measuring device may further include a display 90 displaying the amount of sludge S calculated by the calculator 80 so that the user can easily check the amount of sludge S.

In this way, the measurement device of the embodiment can be simply installed without a separate structural change in a settling tank that has already been installed and is in operation.

In addition, the method for measuring the amount of sludge according to the present invention can also be applied to sedimentation tanks of different structures and specifications that are already installed and operated.

[How to measure the amount of sludge]

The method for measuring the amount of sludge according to the present invention may include a zero point setting step of setting the signal generated by the sensor 60 as a zero signal when the upper tank 40 is filled with fresh water W. . For example, if the length of the support pillar 31 is L ₀ in a state in which the upper tank 40 is filled with fresh water W, the sensor 60 when the length of the support pillar 31 is L ₀ The generated signal can be set as the zero point signal (I ₀ ).

In the zero point setting step, the zero point signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

The method for measuring the amount of sludge is to put sludge (S) of a predetermined weight (Ws) into the upper tank (40) filled with fresh water (W), and measure the measurement signal generated by the sensor (60) and the predetermined A scaling step of associating the weight Ws may be further included.

The sludge (S) introduced in the scaling step may be supplied from the filter press (53) that dehydrates the sludge (S) discharged from the upper tank (40). For example, after measuring the weight of sludge in the form of a cake supplied from the filter press 53, it can be dissolved in an appropriate amount of fresh water and supplied to the sedimentation tank by a pump.

Although in the form of a cake, the cake discharged from the filter press 53 may also contain a significant amount of moisture. Therefore, to accurately measure the weight of the soil particles in the cake, first measure the weight of the cake sample, completely dry the cake in an oven to remove moisture, and then measure the weight to calculate the soil weight ratio in the cake.

Then, a large amount of cake is loaded on a dump truck, etc., the weight of the empty dump truck before loading the cake is measured, and then the weight of the dump truck after the cake is loaded is measured by weighing the cake on a truck scale to measure the weight of the cake. can

Once the cake is weighed, it is dissolved in an appropriate amount of fresh water and pumped to the top of the settling tank. At this time, since the fresh water in the dissolved cake injected into the fresh water tank overflows the sedimentation tank and is discharged anyway, there is no need to consider the amount of fresh water injected to dissolve the cake.

In this way, if several measured values are obtained by repeating the cake input process, and then converted into data in the form of a graph, the corresponding graph and data become a graph representing the unique characteristics of the sedimentation tank and become precise measurement data. On the other hand, thin film sensors or other weight measurement sensors provide a measurement value proportional to the weight, so there is no need to repeat the measurement many times.

In the scaling step, the measurement signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

When the sludge (S) is put into the upper tank (40) filled with fresh water (W), the fresh water (W) overflows by the volume of the sludge (S), and the weight of the upper tank (40) is It increases by the weight (Ws) minus the weight of the overflowing water. In this state, the length of the support pillar 31 may be L ₁ , which is slightly less than L ₀ . The length of the support pillar 31 is linearly proportional to the load applied to the support pillar 31 . Therefore, from the formula of (L ₀ -L ₁ )/Ws, the change in length (dL/dWs) of the support column 31 per unit weight of the sludge contained in the sedimentation tank can be derived.

The sludge amount measurement method is based on the measurement signal of the sensor 60 generated while operating the facility and the scaled value in the scaling step Weight for calculating the amount of sludge (S) in the upper tank 40 A calculation step may be further included.

In the weight calculation step, the measurement signal may be determined based on an average value of signals generated by the plurality of sensors 60 .

If the length of the support column 31 calculated from the signal of the sensor 60 during operation of the sedimentation tank is L ₂ , the length reduction of the support column 31 caused by the sludge S in the sedimentation tank is L ₂ -L ₀ , which is the value (L ₂ -L ₀ )/(dL/dWs) divided by the above-mentioned change in length (dL/dWs) of the support column 31 per unit weight of the sludge contained in the settling tank, It can be said to be the amount of sludge (S) currently in the sedimentation tank.

According to this measurement method, even if the settling tank has different specifications and structures, the amount of sludge inside the settling tank can be relatively accurately measured after the sensor 60 is installed and scaling is performed in the same way as above.

To this end, the calculation unit 80 receives a user input for setting the signal generated by the sensor 60 as a zero signal in a state in which the fresh water W is full, and the fresh water W is full. It may include an input unit 81 for receiving a predetermined weight (Ws) value of the sludge (S) injected into the upper tank (40).

The calculation unit 80 may set a signal generated by the sensor 60 as a zero signal in a state in which the upper tank 40 is filled with fresh water W according to a user's input. The calculation unit 80 calculates the weight (Ws) of the sludge (S) inputted by the user in a state in which the upper tank (40) is full of fresh water (W) and the upper portion filled with fresh water (W). The measurement signal generated by the sensor 60 in a state in which the sludge S of the predetermined weight Ws is put into the tank 40 can be corresponded to. As a result, the calculator 80 may associate the signal generated by the sensor 60 with the weight Ws of the sludge S as described above.

On the other hand, if the sensor 60 directly measures the weight value, or if a weight measurement system to which an algorithm in which the value measured by the sensor 60 is converted into a weight value is applied in advance is applied, the sludge measurement method can be performed as follows .

First, the weight W1 is measured in a state in which the upper tank 40 is filled with fresh water. Then, the specific gravity (Bs) of the sludge is obtained by measuring the volume and weight of the sludge discharged from the settling tank and dewatered in the filter press (53).

Then, after subtracting the weight (W1) from the weight (W2) calculated from the measurement signal generated by the sensor 60 during the operation of the settling tank facility containing muddy water, multiplying the specific gravity (Bs) of the sludge, The value obtained by dividing the difference between the specific gravity (Bs) and the specific gravity (Bw) of water {(W2-W1)*Bs}/(Bs-Bw) is the weight of the sludge (S) contained in the upper tank (40) can

To this end, the calculation unit 80 may receive the specific gravity Bs of the sludge through the input unit 81. Then, the calculation unit 80 multiplies the difference between the weight W2 calculated from the measurement signal generated by the current sensor 60 and the weight W1 calculated from the zero point signal by the specific gravity Bs of the sludge, The weight of the sludge (S) in the upper tank (40) can be calculated by dividing the difference between the specific gravity (Bs) of sludge and the specific gravity (Bw) of water.

Meanwhile, when the lowered water level of the settling tank (upper tank) and the lowered water level are measured through a water level sensor or a flow sensor (not shown), the calculation unit 80 calculates the zero point signal or the weight W1 calculated therefrom. It can be corrected in a lowered form. Therefore, even if the water level in the settling tank is lowered, the weight of the sludge (S) is accurately calculated.

In addition, when the water level in the fresh water tank (lower tank) is lowered and the lowered water level is measured through a water level sensor or a flow sensor, the calculation unit 80 lowers the zero point signal or the weight W1 calculated therefrom. It can be corrected in a losing form. Therefore, even if the water level in the fresh water tank is lowered, the weight of the sludge (S) is accurately calculated.

According to the above-described embodiment, it is possible to relatively accurately predict the amount of sludge in the settling tank by simply installing the measuring device and using a simple measuring method.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operation and effect according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention above, it is natural that the effects predictable by the corresponding configuration should also be recognized.

10: base
20: lower tank
30: support structure
31: support pillar
32: support ring
40: upper tank
41: upper side wall
42: ditch
43: fresh water piping
44: inclined sidewall
441: first inclined sidewall
442: second inclined sidewall
45: bottom outlet
50: suction nozzle
51: suction pipe
52: pump
53: filter press
60: sensor (thin film strain sensor)
70: turbid water supply unit
S: sludge (specific gravity Bs, sample weight Ws)
W: fresh water (specific gravity Bw, weight W1)
SW: muddy water (weight W2)
80: calculation unit
81: input unit
90: display

Claims (11)

As a sludge weight calculation method for calculating the weight of the sludge (S) contained in the upper tank (40) filled with muddy water (SW),
A plurality of support pillars 31 or a support wall are installed on the base 10 supported by the ground, and an upper tank 40 is installed on the support pillar 31 to generate the upper tank 40 A facility preparation step of allowing the load to be supported by the support pillar 31 or the support wall and installing the sensor 60 on the support pillar 31 or the support wall;
A zero point setting step of setting a signal generated by the sensor 60 as a zero point signal in a state in which the upper tank 40 is filled with fresh water W;
Into the upper tank 40 filled with fresh water W, sludge S of a predetermined weight Ws is injected, and the measurement signal generated by the sensor 60 is associated with the predetermined weight Ws scaling step;
A weight calculation step of calculating the amount of sludge (S) in the upper tank 40 based on the measurement signal of the sensor 60 generated while operating the facility and the value scaled in the scaling step; including, Calculation method of sludge weight in sedimentation tank.
The method of claim 1,
The sensor 60 is installed in at least two or more locations on the plurality of support pillars 31 or the support wall,
In the zero point setting step, the zero point signal is determined as an average value of signals generated by the plurality of sensors 60;
In the scaling step and the weight calculation step, the measurement signal is determined as an average value of signals generated by the plurality of sensors (60).
The method of claim 1,
The sludge weight calculation method of the settling tank, wherein the sludge (S) introduced in the scaling step is supplied from the filter press (53) that dehydrates the sludge (S) discharged from the upper tank (40).
As a sludge weight calculation method for calculating the weight of the sludge (S) contained in the upper tank (40) filled with muddy water (SW),
A plurality of support pillars 31 or support walls are installed on the base 10 supported by the ground, and an upper tank 40 is installed on the upper portion so that the load generated by the upper tank 40 is applied to the support A facility preparation step of being supported by a pillar 31 or a support wall and installing a sensor 60 on the support pillar 31 or the support wall;
a zero-point setting step of setting a signal generated by the sensor 60 as a zero-point signal when the upper tank 40 is filled with fresh water W; and
The difference between the weight (W2) calculated from the measurement signal generated by the current sensor 60 and the weight (W1) calculated from the zero point signal is multiplied by the specific gravity (Bs) of the sludge, and the specific gravity (Bs) of the sludge and the water A weight calculation step of calculating the weight of the sludge (S) contained in the upper tank (40) by dividing the difference in specific gravity (Bw);
The method of claim 4,
The sensor 60 is installed at at least two or more locations on the plurality of support pillars 31 or the support wall,
In the zero point setting step, the zero point signal is determined as an average value of signals generated by the plurality of sensors 60;
In the weight calculation step, the sludge weight calculation method of the settling tank, wherein the measurement signal is determined as an average value of signals generated by the plurality of sensors (60).
Base 10 supported by the ground;
A plurality of support pillars 31 or support walls whose lower ends are supported by the base 10 and extend upward;
an upper tank 40 in which loads are supported by the plurality of support pillars 31 or support walls and supplied with muddy water SW, which is a mixture of sludge and water, from a muddy water supply unit 70;
a sensor 60 provided on the support pillar 31 or the support wall to generate a signal proportional to a load applied to the support pillar 31 by the upper tank 40; and
Based on the signal generated by the sensor 60, a calculation unit 80 for calculating the weight of sludge S contained in the muddy water SW in the muddy water SW filled in the upper tank 40 including;
The calculation unit 80 receives a user input for setting the signal generated by the sensor 60 as a zero signal in a state in which the fresh water W is full, and the upper tank full of the fresh water W ( 40) includes an input unit 81 for receiving a predetermined weight (Ws) value of the sludge (S) input,
The calculation unit 80 is a measurement signal generated by the sensor 60 in a state in which the sludge S of the predetermined weight Ws is put into the upper tank 40 filled with fresh water W, A sedimentation tank that correlates the signal generated by the sensor 60 with the weight of the sludge (S) by matching the predetermined weight (Ws) of the sludge (S).
Base 10 supported by the ground;
A plurality of support pillars 31 or support walls whose lower ends are supported by the base 10 and extend upward;
an upper tank 40 in which loads are supported by the plurality of support pillars 31 or support walls and supplied with muddy water SW, which is a mixture of sludge and water, from a muddy water supply unit 70;
a sensor 60 provided on the support pillar 31 or the support wall to generate a signal proportional to a load applied to the support pillar 31 by the upper tank 40; and
Based on the signal generated by the sensor 60, a calculation unit 80 for calculating the weight of sludge S contained in the muddy water SW in the muddy water SW filled in the upper tank 40 including;
The calculation unit 80,
When the upper tank 40 is filled with fresh water W, the signal generated by the sensor 60 is set as a zero signal,
The difference between the weight (W2) calculated from the measurement signal generated by the current sensor 60 and the weight (W1) calculated from the zero point signal is multiplied by the specific gravity (Bs) of the sludge, and the specific gravity (Bs) of the sludge and the water A settling tank for calculating the weight of the sludge (S) contained in the upper tank (40) by dividing the difference in specific gravity (Bw).
According to claim 6 or 7,
The sensor 60 is attached to a side surface of the support pillar 31 or the support wall to detect a change in length of the support pillar 31 or the support wall to generate a signal.
The method of claim 8,
The sensor 60 is installed in at least two or more locations on the plurality of support pillars 31 or the support wall,
The calculation unit 80 averages the signals generated by the plurality of sensors 60 to calculate the weight of the sludge (S).
The method of claim 8,
The sensor 60 is a thin film strain sensor, the sedimentation tank.
According to claim 6 or 7,
a lower discharge port 45 provided at a lower end of the upper tank 40 and discharging the sludge S precipitated in the upper tank 40;
A ditch 42 provided around the upper end of the upper tank 40 and discharging fresh water W exceeding the upper end level of the upper tank 40; and
Further comprising a display 90 displaying the amount of sludge (S) calculated in the calculation unit 80; sedimentation tank.

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