JP7107714B2 - Slurry property measuring device and slurry property measuring method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slurry property measuring apparatus and a slurry property measuring method for measuring properties of a test liquid produced by adding a flocculating agent to water to be treated to flocculate suspended solids.

In the flocculation treatment of water to be treated such as sewage, after flocculating suspended solids in the water to be treated by adding a flocculating agent, solidification such as sedimentation separation, pressure flotation separation, centrifugation, sand filtration, and membrane separation is performed. Liquid separation takes place. The flocculation state of suspended solids varies depending on pH, amount of flocculating agent added, stirring conditions, and the like. For this reason, if the coagulation treatment is not performed under appropriate conditions, the water quality of the water to be treated is deteriorated, which may adversely affect the solid-liquid separation treatment in the next step. Therefore, it is important to grasp the state of flocculation of the suspended solids when changing the treatment conditions such as changing the flocculant.

Patent Literature 1 discloses a method for examining the aggregation state of treated water during a water purification process. A CST test is also known as a method for measuring the aggregation state of suspended solids. In the CST test, a cylindrical reservoir is arranged on the upper surface of the filter paper, the slurry that has undergone agglomeration treatment is put into the reservoir, and the progress time of water in the filter paper is measured.

JP 2014-002050 A

The CST test is convenient. However, if flocs formed by agglomeration accumulate at the bottom of the reservoir and inhibit the penetration of water into the filter paper, accurate measurement cannot be performed.

Therefore, the present invention proposes to simultaneously measure the influence of the liquid viscosity and aggregation state on the permeation rate of the liquid to be inspected, which is produced by adding a flocculating agent to the water to be treated to flocculate the suspended solids. aim.

In order to achieve the above object, the present invention provides a slurry property measuring device for measuring the properties of a liquid to be inspected produced by adding a flocculating agent to water to be treated and flocculating suspended solids, in which a filter paper is placed. a mounting table on which the filter paper is placed, a tubular reservoir mounted on the mounting table with the filter paper sandwiched therebetween, and the reservoir from the first distance to the second distance and from the second distance to the third distance timer means for measuring the time for water in the liquid to be inspected that has been put into the filter paper to travel through the filter paper, and the timer means is provided apart from the filter paper .

The present invention also provides a method for measuring the properties of a slurry for measuring the properties of a liquid to be inspected produced by adding a flocculating agent to water to be treated to flocculate suspended solids, wherein the step of placing a filter paper on a mounting table. a step of placing a cylindrical reservoir on the mounting table with the filter paper sandwiched therebetween; a first timing step of measuring the time it takes for the water to travel through the filter paper; 2 timing step, obtaining the viscosity of the liquid to be inspected based on the time measured in the first timing step, and obtaining the particle size of flocs of the liquid to be inspected based on the time measured in the second timing step. and .

According to the present invention, it is possible to simultaneously measure the influence of the liquid viscosity and the state of aggregation on the permeation rate of the liquid to be inspected, which is produced by adding a flocculating agent to the water to be treated to flocculate the suspended solids. can.

1 is a top view of a first embodiment of a slurry property measuring device according to the present invention; FIG. 1 is a cross-sectional view of a slurry property measuring device according to the present embodiment; FIG. It is a block diagram of a measuring instrument of the slurry property measuring apparatus of the present embodiment. FIG. 2 is a cross-sectional view of a second embodiment of a slurry property measuring device according to the present invention; It is a top view of a third embodiment of a slurry property measuring device according to the present invention. FIG. 3 is a side view of a third embodiment of a slurry property measuring device according to the present invention; It is a top view of the mounting table of the third embodiment of the slurry property measuring apparatus according to the present invention.

Several embodiments of a slurry property measuring apparatus according to the present invention will be described with reference to the drawings. Note that this embodiment is merely an example, and the present invention is not limited to this. The same reference numerals are given to the same or similar configurations, and redundant explanations are omitted.

[First embodiment]
FIG. 1 is a top view of a first embodiment of a slurry property measuring device according to the present invention. FIG. 2 is a cross-sectional view of the slurry property measuring device of this embodiment.

A slurry property measuring device 81 of this embodiment has a housing 11 , a reservoir 14 , three probes 15 , 16 , 17 and a measuring device 20 . A mounting table 12 on which the filter paper 90 is mounted is formed in the housing 11 . The reservoir 14 is cylindrical. Reservoir 14 is, for example, cylindrical. The outer diameter of reservoir 14 is, for example, 20 mm.

All three probes 15, 16 and 17 are probes for measuring capacitance. The first probe 15 , the second probe 16 and the third probe 17 are arranged at different distances from the reservoir 14 . For example, the distance between first probe 15 and second probe 16 and the distance between second probe 16 and third probe 17 are equal. The distance between the outer surface of the reservoir 14 and the first probe 15, the distance between the first probe 15 and the second probe 16, and the distance between the second probe 16 and the third probe 17 The distances are, for example, 5 mm each.

A measuring instrument 20 is connected to the probes 15 , 16 and 17 . The measuring instrument 20 has two indicators 21 and 22 .

FIG. 3 is a block diagram of the measuring instrument of the slurry property measuring apparatus of this embodiment.

The measuring instrument of the slurry property measuring device 81 of the present embodiment has a first counter 23 , a second counter 24 , a first indicator 21 and a second indicator 22 . A first counter 23 is connected to the first probe 15 and the second probe 16 . The second counter 24 is connected with the second probe 16 and the third probe 17 . The first indicator 21 is connected to the first counter 23 . A second display 22 is connected to a second counter 24 .

The first counter 23 measures the difference (time) between the time when the first probe 15 detects the change in capacitance and the time when the second probe 16 detects the change in capacitance. The second counter 24 measures the difference (time) between the time when the second probe 16 detects the change in capacitance and the time when the third probe 17 detects the change in capacitance.

The first display 21 displays the time measured by the first counter 23 . The second display 22 displays the time measured by the second counter 24 .

Next, a slurry property measuring method using the slurry property measuring apparatus of the present embodiment will be described.

In the slurry property measuring method of the present embodiment, the property of slurry produced by adding a polymer flocculant to sludge is measured. Here, the properties of the slurry include at least the viscosity of the liquid portion and the size of the solid portion, that is, the granulated and aggregated flocs.

First, a polymer flocculant is added to sludge to generate slurry 92 to be measured. Also, a filter paper 90 is arranged on the mounting table 12 of the slurry property measuring device 10 . Furthermore, the reservoir 14 is placed on the filter paper 90 . At this time, the reservoir 14 is arranged at the center of the filter paper 90 .

Next, the slurry 92 to be measured is injected into the reservoir 14 through the upper opening of the reservoir 14 . As a result, the liquid in the slurry 92 advances through the filter paper 90 from the position in contact with the reservoir 14 toward the outer periphery due to capillary action.

As liquid in slurry 92 travels through filter paper 90 and reaches the top of probes 15, 16, 17, the capacitance around probes 15, 16, 17 changes. By detecting changes in these capacitances, it is possible to measure the time at which the liquid in the slurry 92 advances to the positions of the probes 15, 16 and 17, respectively. The time when the liquid in the slurry 92 reaches the position of the first probe 15 is t1, the time when the liquid in the slurry 92 reaches the position of the second probe 16 is t2, and the slurry 92 reaches the position of the third probe 17. Let t3 be the time the liquid inside reaches.

The first counter 23 measures the time from time t1 when the liquid in the slurry 92 reaches the position of the first probe 15 to time t2 when the liquid in the slurry 92 reaches the position of the second probe 16, that is, the first A travel time (T1=t2-t1) is calculated. The second counter 24 measures the time from time t2 when the liquid in the slurry 92 reaches the position of the second probe 16 to time t3 when the liquid in the slurry 92 reaches the position of the third probe 17, that is, the second Calculate the progress time (T2=t3-t2).

The first display 21 displays the first progress time (T1). A second display 22 displays the second progress time (T2).

Even if a polymer flocculant is added to the same sludge, if the type of polymer flocculant is different, the state of flocculation of the solid components in the sludge, that is, the state of floc formation, will be different. Moreover, even if the polymer flocculant is added to the same sludge, the viscosity of the liquid component in the sludge will differ if the type of polymer flocculant is different.

When the viscosity of the liquid component is high, the advancing speed in the filter paper 90 becomes slow. This has a particularly large effect at positions close to the reservoir 14 . Therefore, the longer the first advance time T1 is, the higher the viscosity of the liquid in the slurry 92 is.

If the particle size of flocs formed by agglomeration of the solid components in the slurry 92 is small, the permeation of the liquid into the filter paper 90 by the flocs that have settled and accumulated in the lower portion of the reservoir 14 is suppressed. Therefore, the arrival time of the liquid component to a position away from the reservoir 14 in the filter paper 90 is delayed. This effect increases as the deposition of flocs progresses, that is, as the elapsed time from the injection of the slurry 92 into the reservoir 14 increases. Therefore, the larger the second advancing time T2, the smaller the grain size of the flocs.

As described above, in the present embodiment, it is possible to simultaneously measure the influence of the liquid viscosity and aggregation state of the slurry generated by adding a polymer flocculant to the sludge and the liquid permeation rate.

[Second embodiment]
FIG. 4 is a cross-sectional view of a second embodiment of a slurry property measuring device according to the present invention.

A slurry property measuring device 82 of the present embodiment has a bottom plate 31 , a side plate 32 and an upper plate 33 . The upper surface of the bottom plate 31 is the mounting table 12 on which the filter paper 90 is mounted.

The side plate 32 is connected to, for example, an end portion of the bottom plate 31 and extends upward. The upper plate 33 is supported by the side plate 32 at its ends, for example. The top plate 33 is arranged parallel to the bottom plate 31, for example. A through hole 34 is formed through the upper plate 33 in the plate thickness direction. A smartphone 46 equipped with a camera 41 is placed on the upper surface of the upper plate 33 so as to be able to capture an image of the filter paper 90 .

The smartphone 46 detects the difference in the appearance of the filter paper 90 depending on the presence or absence of the liquid to be inspected from the image of the filter paper 90 captured by the camera 41, and detects the difference in the appearance of the filter paper 90 to the first distance, the second distance, and the third distance. It functions as an image processing section that obtains the time (t1, t2 and t3) for water to travel through the filter paper 90 .

The smartphone 46 measures the time from the time t1 when the liquid in the slurry 92 reaches the first distance to the time t2 when the liquid in the slurry 92 reaches the second distance, that is, the first traveling time (T1 = t2 - t1 ) is calculated. In addition, the smartphone 46 determines the time from the time t2 when the liquid in the slurry 92 reaches the second distance to the time t3 when the liquid in the slurry 92 reaches the third distance, that is, the second progress time (T2= t3-t2) is calculated.

The smart phone 46 displays the first progress time (T1) and the second progress time (T2).

In this manner, the first advancing time (T1) and the second advancing time (T2) can also be measured in this embodiment. That is, in the present embodiment as well, it is possible to simultaneously measure the influence of the liquid viscosity and aggregation state of the slurry produced by adding a polymer flocculant to the sludge, on the permeation rate of the liquid.

[Third embodiment]
FIG. 5 is a top view of a third embodiment of a slurry property measuring device according to the present invention. FIG. 6 is a side view of the slurry property measuring device of this embodiment. FIG. 7 is a top view of the mounting table of the slurry property measuring apparatus of this embodiment.

A slurry shape measuring device 83 of this embodiment has a housing 51 , a reservoir 14 and a pressing plate 55 . The housing 51 is formed in a substantially rectangular parallelepiped shape. One surface of the housing 51 is a mounting table 52 for the filter paper 90 . Case-side magnets 56 are embedded in, for example, four places around the mounting table 52 .

A reservoir locating hole 58 having a diameter slightly larger than the outer diameter of the reservoir 14 is formed substantially in the center of the pressing plate 55 . The reservoir arrangement hole 58 penetrates the pressing plate 55 in the plate thickness direction. A pressing plate-side magnet 57 is embedded around the pressing plate 55 at a position overlapping with the housing-side magnet 56 . The housing-side magnet 56 and the pressing plate-side magnet 57 are arranged so that the S pole and the N pole face each other.

Also in the slurry property measuring apparatus of the present embodiment, a polymer flocculant is added to sludge to generate slurry to be measured. Also, a filter paper 90 is arranged on the mounting table 52 of the slurry property measuring device 83 . Furthermore, the holding plate 55 is placed on the filter paper 90 . Also, the reservoir 14 is placed on the filter paper 90 . At this time, the reservoir 14 is arranged in the reservoir arrangement hole 58 of the pressing plate 55 .

Next, the slurry to be measured is injected into the reservoir 14 through the upper opening of the reservoir 14 . As a result, the liquid in the slurry advances through the filter paper 90 from the position in contact with the reservoir 14 toward the outer periphery due to capillary action. The time required for the liquid in the slurry to advance is measured by a probe (not shown) and a measuring instrument (not shown) provided on the rear surface of the mounting table 52 . Those times are displayed on the display 53 .

As described above, in the present embodiment, it is possible to simultaneously measure the influence of the liquid viscosity and aggregation state of the slurry generated by adding a polymer flocculant to the sludge and the liquid permeation rate.

In the slurry property measuring apparatus 83 of the present embodiment, since the filter paper 90 is pressed against the mounting table 52 by the pressing plate 55, the contact state between the filter paper 90 and the mounting table 52 is uniformed, so that variations in each measurement, In addition, variations in the progress of the liquid due to the position of the filter paper 90 are suppressed. Therefore, measurement accuracy is improved. Furthermore, since the filter paper 90 is pressed against the mounting table 52 by the pressing plate 55, a capillary phenomenon occurs between the mounting table 52 and the pressing plate 55, which promotes the advance of the liquid.

Since magnets are respectively arranged on the mounting table 52 and the holding plate 55 , the position of the holding plate 55 with respect to the mounting table 52 does not change. Therefore, the position of the reservoir placement hole 58 does not change with respect to the housing 51 . Therefore, it is easy to arrange the reservoir 14 at a predetermined position of the housing 51 . As a result, since the position of the reservoir 14 with respect to the probe does not change, variations between measurements are suppressed. In this embodiment, magnets are arranged on both the mounting table 52 and the pressing plate 55, but one may be a magnet and the other may be a ferromagnetic material such as iron.

DESCRIPTION OF SYMBOLS 11... Case, 12... Mounting base, 14... Reservoir, 15... Probe, 16... Probe, 17... Probe, 20... Measuring instrument, 21... Indicator, 22... Indicator, 23... Counter, 24... Counter, 31 ... Bottom plate 32 ... Side plate 33 ... Top plate 34 ... Through hole 41 ... Camera 46 ... Smart phone 51 ... Housing 52 ... Mounting table 53 ... Display device 55 ... Pressing plate 56 ... Housing side magnet , 57... Pressing plate side magnet, 58... Reservoir arrangement hole, 81... Slurry property measuring device, 82... Slurry property measuring device, 83... Slurry property measuring device, 90... Filter paper, 92... Slurry

Claims (7)

In a slurry property measuring device for measuring properties of a liquid to be inspected produced by adding a flocculating agent to water to be treated to flocculate suspended solids,
a mounting table for mounting the filter paper;
a cylindrical reservoir mounted on the mounting table with the filter paper sandwiched therebetween;
a timing means for measuring the time for water in the liquid to be inspected that has been put into the reservoir from the first distance to the second distance and from the second distance to the third distance to travel through the filter paper;
has
The slurry property measuring apparatus , wherein the timer is provided apart from the filter paper . 2. The slurry property measuring apparatus according to claim 1, further comprising a pressing plate for pressing the filter paper against the mounting table. 3. The apparatus for measuring slurry properties according to claim 2, further comprising a plurality of magnets arranged on one of said mounting table and said holding plate and facing either one of the magnet and the ferromagnetic material arranged on the other. The timing means is a first probe arranged on the rear surface of the mounting table at the first distance, the second distance and the third distance from the outer surface of the reservoir to measure the surrounding capacitance. , a second probe, a third probe, and a second probe that measures the difference between the time when the first probe detects a change in capacitance and the time when the second probe detects a change in capacitance 1 counter, and a second counter that measures the difference between the time when the second probe detects a change in capacitance and the time when the third probe detects a change in capacitance. The slurry property measuring device according to claim 3.
The timing means detects a difference in appearance of the filter paper due to presence or absence of the liquid to be inspected from an image of the filter paper captured by a camera arranged so as to be able to image the filter paper, and measures a first distance, a first distance, and a second distance. 2. The slurry property measuring apparatus according to claim 1 , further comprising an image processing unit that determines the time required for water in the liquid to be inspected to travel through the filter paper up to a second distance and a third distance. 6. A method according to any one of claims 1 to 5, characterized in that the difference between said second distance and said first distance and the difference between said third distance and said second distance are equal. Slurry properties measuring device. In a slurry property measuring method for measuring properties of a liquid to be inspected produced by adding a flocculating agent to water to be treated to flocculate suspended solids,
a step of placing the filter paper on a mounting table;
placing a cylindrical reservoir on the mounting table with the filter paper sandwiched therebetween;
a first timing step of measuring the time taken for the water in the liquid to be inspected, which has been put into the reservoir, to travel through the filter paper from a first distance to a second distance;
a second timing step of measuring the time taken for the water in the liquid to be inspected, which has been put into the reservoir, to travel through the filter paper from the second distance to the third distance;
determining the viscosity of the liquid to be inspected based on the time measured in the first timing step, and determining the particle size of flocs of the liquid to be inspected based on the time measured in the second timing step;
A method for measuring slurry properties, comprising:

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