JP2016191591A - Fibrous object measurement device and measurement method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fibrous object measurement device 1 for measuring a fibrous object S in sludge.SOLUTION: Sludge containing a fibrous object S is quantitatively supplied to a storage tank 2 and the sludge is diluted to fixed concentration and agitated so as to measure viscosity. The viscosity is substituted for a predetermined relational expression to calculate concentration (quantity) of the fibrous object S.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fibrous material measuring device and a measuring method thereof, and more particularly to a fibrous material measuring device and a measuring method thereof for measuring a concentration from the viscosity of a fluid.

  Conventionally, the water treatment system of a sewage treatment plant is generally used to decompose and purify the organic matter using microorganisms in a reaction tank of the supernatant liquid that has been settled and separated in the settling basin first in the treatment water flowing into the treatment plant. After being settled and separated in a pond, it is discharged into rivers. On the other hand, in the sludge treatment system, the initial settling sludge in the first settling basin and the excess sludge in the final settling basin are mixed after passing through a concentration step, and the volume is reduced in a digestion tank as necessary. Thereafter, solid-liquid separation is performed by a dehydrator, and the dehydrated cake produced by the dehydrator is incinerated or disposed of in landfills.

  The sludge in the sewage treatment plant contains a large amount of cellulosic fibrous material derived from toilet paper. In order to produce a dehydrated cake with a low water content stably in a dehydrator, it is known that the fiber content (cellulose component) contained in the sludge is greatly affected, and the inclusion of fibrous materials contained in the sludge If the rate is grasped, the sludge before dehydration can be optimally modified with the minimum necessary coagulant, and a dehydrated cake having a low water content can be stably produced by a subsequent dehydrator.

  In addition, invention of patent document 1 regarding a prior art provides the sludge containing a fiber content in the primary side area | region of the filter which separates a primary side area | region and a secondary side area | region, in a primary side area | region and a secondary side area | region. The fiber concentration contained in the sludge is measured by measuring the pressure difference and the elapsed time until the pressure difference reaches the target value.

Japanese Patent No. 5305878

  By the way, the water to be treated flowing into the sewage treatment plant has a problem that the amount of inflow and the components (fibrous materials, etc.) in the water to be treated vary due to daily fluctuations, seasonal fluctuations, weather, and the like.

  Moreover, the thing of the said patent document 1 had the problem that solid content other than the fiber content contained in sludge had a possibility that it had a high influence on pressure, and was unreliable (the primary side area | region filtered with a filter). The pressure is affected by the various solids remaining in the Further, there is a problem that it is necessary to drive the cleaning pump after the measurement to clean the filter, and it is necessary to periodically replace the filter due to clogging of the filter or the like.

  Therefore, an apparatus capable of accurately measuring the fiber concentration contained in the sludge has been desired.

  The present invention has been made in view of the above problems, and the knowledge that the sludge viscosity does not depend on the amount or concentration of the solid matter but depends only on the fiber content in the solid matter. The present invention provides a method for measuring the sludge viscosity and calculating the fiber concentration (amount) from the measured value.

  The invention according to claim 1 is a storage tank in which a fluid containing a fibrous material is stored, a viscosity measuring unit that measures the viscosity of the fluid stored in the storage tank, and the viscosity measurement. And a calculation system for calculating the concentration of the fibrous material in the fluid stored in the storage tank using the viscosity measured by the unit and a calculation formula recorded in advance in a memory. It is.

  Invention of Claim 2 has a dilution part which dilutes the fluid accommodated in the said storage tank in the fibrous-material measuring apparatus of Claim 1, and the said viscosity measurement part is the said dilution part. And the calculation system is configured to measure the viscosity of the fibrous material in the fluid stored in the storage tank using the ratio of dilution in the dilution section. A fibrous material measuring apparatus configured to calculate a concentration.

  The invention according to claim 3 is the fibrous material measuring apparatus according to claim 2, wherein a concentration measuring unit that measures the concentration of the fluid contained in the containing tank before dilution in the dilution unit. And a fibrous material measuring apparatus configured to change a dilution ratio in the dilution section in accordance with a measurement result in the concentration measurement section.

  Invention of Claim 4 is equipped with the storage tank in which the fluid containing a fibrous material is accommodated, The viscosity measurement process of measuring the viscosity of the fluid accommodated in the said storage tank, The said viscosity A fibrous material having a concentration calculating step of calculating the concentration of the fibrous material in the fluid stored in the storage tank using the viscosity measured in the measuring step and the arithmetic expression recorded in the memory in advance. This is a measurement method.

  Invention of Claim 5 has the fluid dilution process which dilutes the fluid accommodated in the said storage tank in the fibrous material measuring method of Claim 4, and the said viscosity measurement process is a flow. It is a step of measuring the viscosity of the fluid diluted in the body dilution step, and the concentration calculation step uses the ratio of dilution in the fluid dilution step and the fibers in the fluid stored in the storage tank This is a fibrous material measuring method for calculating the concentration of the fibrous material.

  The invention according to claim 6 is the method for measuring a fibrous material according to claim 5, wherein the viscosity of the fluid stored in the storage tank in the viscosity measuring step is set before the dilution in the dilution step. It is a fibrous material measuring method which measures and changes the ratio of dilution in the dilution process according to the measurement result of the viscosity in the viscosity measurement process.

  The invention according to claim 7 is the method for measuring a fibrous material according to claim 5, further comprising a concentration measuring step of measuring the concentration of the fluid stored in the storage tank before the dilution in the dilution step. And a method for measuring a fibrous material in which the ratio of dilution in the dilution step is changed according to the measurement result of the concentration in the concentration measurement step.

  According to the present invention, there is an effect that the fiber concentration can be accurately calculated from sludge whose properties change in real time. In addition, since the basic relational expression is calculated based on the fiber content only, accurate calculation is possible.When used in a sewage treatment plant, the fiber concentration is measured stably in the previous stage of the dehydrator. There is an effect that it can be reformed into sludge capable of producing a dehydrated cake with a low content.

  And since the dehydrated cake of low moisture content is produced | generated stably, there exists an effect that the running cost for conveyance and disposal of a dehydrated cake can be reduced.

  Furthermore, if the fiber content concentration is measured in the front stage of the digester, the production amount of digestion gas can be predicted.

It is the schematic which shows the outline of a fibrous material measuring apparatus. It is explanatory drawing explaining the relationship between a density | concentration and a viscosity.

  As shown in FIG. 1, the fibrous material measuring apparatus 1 according to the embodiment of the present invention includes a storage tank (storage tank) 2, a viscosity measurement unit (viscosity measurement sensor) 3, and an arithmetic system (CPU and memory). (Computed computing unit) 4.

  The storage tank 2 is configured to store a fluid R (liquid material; for example, sewage sludge (sometimes simply referred to as “sludge”)) containing the fibrous material S. The viscosity measuring unit 3 is configured to measure the viscosity of the fluid R stored in the storage tank 2.

  The calculation system 4 uses the viscosity measured by the viscosity measurement unit 3 and the calculation formula recorded in the memory in advance (for example, the viscosity measured by the viscosity measurement unit 3 is separately obtained in advance and recorded in the memory. The concentration of the fibrous material in the fluid R stored in the storage tank 2 is calculated by substituting it into the relational expression between viscosity and concentration.

  As the above relational expression, for example, the one shown by a diagram G1 in FIG. 2 can be listed. The diagram G1 is represented by “y = 0.151x−45.129”. “Y” is the viscosity, and “x” is the SS concentration (fibrous material concentration).

  The relationship between viscosity and concentration will be described. Sewage sludge (sewage) flowing into general sewage treatment plants is composed of “organic matter” such as food residues and excreta, “inorganic matter” such as gravel mixed during transportation, and mainly dissolved toilet paper. Cellulose-based “fibrous material S” is contained.

  The sludge has a correlation that the viscosity increases with increasing concentration in a certain concentration range (for example, the measurement limit sludge concentration range shown in FIG. 2).

  Therefore, only the “fibrous matter S” was recovered from the sludge, and the solid content in the sludge was tested for the relationship between concentration and viscosity in the state of “organic matter” and “inorganic matter” that do not contain fibrous matter. There is no relationship. Specifically, even if the concentration of “organic matter” or “inorganic matter” is changed, the viscosity is maintained at around “0” and hardly rises or falls (see diagram G2 in FIG. 2).

  On the contrary, when the relationship between the concentration and the viscosity was tested in a state where the solid content in the sludge was only “fibrous material S”, the correlation that the viscosity increases with increasing concentration (within a certain concentration range). (See diagram G1 in FIG. 2).

  As a result, for the sludge containing the fibrous material S, it can be seen that the concentration-viscosity relationship is almost dependent only on the concentration of the “fibrous material S”.

  Further explanation will be given. FIG. 2 is a graph showing the relationship between concentration and viscosity. The relationship between the concentration and the viscosity when the fibrous material S is 100% (diagram G1) and when the fibrous material S is 0% (diagram G2) is shown. Actually, a relational expression between the viscosity and the concentration is obtained in a state where only the fibrous material S is included in advance by an experiment or the like. Since the viscosity and the concentration are proportional, the approximate expression can be calculated by a linear function expression (y = 0.015x−450129 described above).

  By the above, it is comprised so that the density | concentration of the fibrous substance S in the fluid accommodated in the storage tank 2 may be calculated using the viscosity measured in the viscosity measurement part 3, and the arithmetic expression currently recorded by memory. Therefore, it is possible to accurately measure the concentration of only the fibrous material S in the fluid with a simple configuration.

  Moreover, in this embodiment, the dilution part 5 which dilutes the fluid R accommodated in the storage tank 2 is provided in the fibrous material measuring device 1. In the dilution section 5, for example, water is added to the sewage sludge in the storage tank 2 for dilution, and this dilution is performed by adding a predetermined ratio of water to the sewage sludge. Dilution by the dilution unit 5 is performed in order to perform measurement by the viscosity measurement unit 3.

  For example, when the concentration of the fibrous material S is too high (for example, the value of “x” in FIG. 2 is “150,000” or more), the viscosity of the sewage sludge is too high and is outside the measurement range of the viscosity measuring unit 3. End up. In view of this, the dilution section (dilution water supply section) 5 is diluted with, for example, tap water to make the viscosity within a measurable range of the viscosity measurement section 3.

  The viscosity measurement unit 3 is configured to measure the viscosity of the fluid R diluted by the dilution unit 5. That is, the viscosity measuring unit 3 measures the viscosity of the diluted fluid R stored in the storage tank 2. In this case, the calculation system 4 is configured to calculate the concentration of the fibrous material S in the fluid R stored in the storage tank 2 using the ratio diluted by the dilution unit 4.

  For example, when the fluid R is diluted twice (when diluted water having the same mass as the fluid R is added to the fluid R), the fibrous material S calculated from the viscosity measured with the diluted fluid The density value is doubled.

  In the case of a general sewage treatment plant, the concentration of inflowing sewage sludge can be estimated to some extent, including the width of the shade. Therefore, by providing the water level measuring unit 13 in the storage tank 2 and diluting until the water level reaches a predetermined level, the sludge concentration in the storage tank can be adjusted within a measurable setting range, and the viscosity can be easily measured.

  Further, in the fibrous material measuring device 1, the concentration of the fluid R accommodated in the accommodating tank 2 (concentration of the fibrous material S, other inorganic materials and organic materials) before dilution in the dilution unit 5 is set. A concentration measuring unit 6 for measurement may be provided. The fibrous material measuring device 1 can be configured to change the dilution ratio in the dilution unit 5 in accordance with the measurement result in the concentration measurement unit 6. Further, the dilution unit 5 can be controlled by the calculation system 4.

  The viscosity of the sewage sludge and the concentration of the fibrous material S in the sewage sludge have a substantially positive correlation. Thereby, the quantity of the water added by the dilution part 5 can be determined so that it may become in the measurement range of the viscosity measurement part 3. FIG. Further, the dilution ratio in the dilution section 5 may be changed according to the measurement result in the viscosity measurement section 3.

  The storage tank 2 may be provided with a stirring unit 7 (stirring device) for stirring the inside of the storage tank 2 as necessary. By stirring with the stirring part 7, water and sewage sludge are mixed uniformly.

  Here, the fibrous material measuring apparatus 1 and the like will be described in more detail.

  First, sludge containing fibers is supplied to the storage tank 2 from the supply pipe 8 branched from the sludge transport line M. The supply pipe 8 is provided with a valve 14 to adjust the supply amount of sludge. You may arrange | position supply pump 9 grade | etc., As needed. In the case of incorporating the fibrous material measuring apparatus 1 of the present embodiment in a general sewage treatment plant (which is already well known and will not be described in detail), a large amount of fibrous content is contained in the initial sedimentation sludge that settles in the first sedimentation basin. Therefore, the supply pipe 8 is provided in the middle of the transfer pipe from the first sedimentation tank to the gravity concentration tank.

  The storage tank 2 only needs to have a shape that allows sludge to be uniformly dispersed within a predetermined residence time. In the present embodiment, the storage tank 2 has a stirring portion 7 (stirring device) inside, and thus has a cylindrical shape. . The sludge is supplied into the storage tank 2 from the upper part of the storage tank 2. Further, the sludge supplied to the storage tank 2 and whose viscosity is detected is returned to the sludge transport line M from the lower part of the storage tank 2 through the discharge pipe 11. A valve 12 provided in the middle of the discharge pipe 11 opens and closes the discharge pipe 11.

  Here, the operation of the fibrous material measuring apparatus 1 will be described.

  The valve 12 is closed and the sludge is supplied into the storage tank 2. The sludge supplied into the storage tank 2 is stirred by the stirring unit 7 so that the whole is uniform. A known stirring device (such as a stirring blade or a staying action by aeration) can be used for the stirring unit 7.

  The concentration of the sludge supplied to the storage tank 2 is measured using the concentration measuring unit 6. The concentration measuring unit 6 can use a known measuring device (such as an MLSS meter or a TS meter).

  When the sludge concentration in the storage tank 2 is out of the predetermined range, the dilution water is supplied from the dilution water pipe 10 and adjusted so that the sludge concentration falls within the set range. This is because an accurate viscosity cannot be measured if it is out of the set range. The setting range of the sludge concentration in the present embodiment is 3000 to 15000 mg / L, and particularly preferably 5000 to 13000 mg / L. In the present embodiment, the sludge concentration supplied to the storage tank 2 is not lower than a predetermined setting range. However, when the sludge concentration is increased to a predetermined range, a filter that passes only the liquid component is included in the measurement tank. A technique such as changing the volume by moving up and down at can be used.

  Next, after confirming that the sludge concentration in the storage tank 2 is within the set range, the viscosity measuring unit 3 measures the sludge viscosity. A known measuring device can be used for the viscometer side portion 3.

  The viscosity measurement value is transmitted to the calculation system 4 and substituted into the relational expression obtained in advance to calculate the fiber content concentration. The amount of fibrous material is calculated by subtracting the diluted ratio.

  By the way, the viscosity changes depending on the temperature of the sludge in addition to the concentration of the fibrous material in the sludge. Therefore, the temperature of the sludge in the storage tank 2 is measured by the temperature measuring unit, and this measurement result is used to determine the sludge. You may make it correct | amend the viscosity of this and the density | concentration of the fibrous material in sludge. In this case, the correction is also made in advance by storing the value (correction formula) in the memory.

  Moreover, you may grasp | ascertain the Example mentioned above as a fibrous material measuring method shown next.

  This fibrous material measuring method includes a storage tank in which a fluid containing a fibrous material is stored, a viscosity measuring step of measuring the viscosity of the fluid stored in the storage tank, and the viscosity measurement A concentration calculating step of calculating the concentration of the fibrous material in the fluid stored in the storage tank using the viscosity measured in the step and the arithmetic expression recorded in advance in the memory.

  Further, the fibrous material measuring method includes a fluid dilution step for diluting the fluid accommodated in the accommodating tank, and the viscosity measuring step is configured to determine the viscosity of the fluid diluted in the fluid dilution step. It is a measurement step, and the concentration calculation step calculates the concentration of the fibrous material in the fluid stored in the storage tank using the dilution ratio in the fluid dilution step.

  Further, the fibrous material measuring method measures the viscosity of the fluid contained in the containing tank in the viscosity measuring step before dilution in the diluting step, and measures the viscosity in the viscosity measuring step. Depending on the result, the ratio of dilution in the dilution step is changed.

  Further, the fibrous material measuring method includes a concentration measuring step for measuring the concentration of the fluid contained in the containing tank before dilution in the dilution step, and the concentration measurement in the concentration measuring step. Depending on the result, the ratio of dilution in the dilution step is changed.

DESCRIPTION OF SYMBOLS 1 Fibrous material measuring apparatus 2 Containment tank 3 Viscosity measurement part 4 Arithmetic system 5 Dilution part 6 Concentration measurement part 7 Stirring part 8 Supply pipe 9 Supply pump 10 Dilution water piping 11 Discharge pipe 12 Valve 13 Water level measurement part 14 Valve

Claims (7)

A storage tank in which a fluid containing a fibrous material is stored;
A viscosity measuring unit for measuring the viscosity of the fluid contained in the containing tank;
A calculation system that calculates the concentration of the fibrous material in the fluid stored in the storage tank, using the viscosity measured by the viscosity measuring unit and the calculation formula recorded in advance in the memory,
A fibrous material measuring apparatus comprising: In the fibrous material measuring device according to claim 1,
Having a diluting section for diluting the fluid contained in the containing tank;
The viscosity measurement unit is configured to measure the viscosity of the fluid diluted in the dilution unit,
The said calculation system is comprised so that the density | concentration of the fibrous material in the fluid accommodated in the said storage tank may be calculated using the ratio of the dilution in the said dilution part, The fibrous material characterized by the above-mentioned measuring device. In the fibrous material measuring device according to claim 2,
Prior to dilution in the dilution section, having a concentration measurement section for measuring the concentration of the fluid stored in the storage tank,
A fibrous material measuring apparatus configured to change a dilution ratio in the diluting unit in accordance with a measurement result in the concentration measuring unit. A storage tank in which a fluid containing a fibrous material is stored;
A viscosity measuring step for measuring the viscosity of the fluid contained in the containing tank;
Using the viscosity measured in the viscosity measurement step and the calculation formula recorded in advance in the memory, a concentration calculation step for calculating the concentration of the fibrous material in the fluid stored in the storage tank;
A method for measuring a fibrous material, comprising: In the fibrous material measuring method according to claim 4,
Having a fluid dilution step of diluting the fluid contained in the containing tank;
The viscosity measurement step is a step of measuring the viscosity of the fluid diluted in the fluid dilution step,
The said density | concentration calculation process calculates the density | concentration of the fibrous material in the fluid accommodated in the said storage tank using the ratio of the dilution in the said fluid dilution process, The fibrous material measuring method characterized by the above-mentioned. In the fibrous material measuring method according to claim 5,
Before dilution in the dilution step, measure the viscosity of the fluid stored in the storage tank in the viscosity measurement step,
The method for measuring a fibrous material, wherein the ratio of dilution in the dilution step is changed according to the measurement result of the viscosity in the viscosity measurement step. In the fibrous material measuring method according to claim 5,
Before dilution in the dilution step, having a concentration measurement step of measuring the concentration of the fluid stored in the storage tank;
A method for measuring a fibrous material, wherein the ratio of dilution in the dilution step is changed according to the measurement result of the concentration in the concentration measurement step.

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