JP2002253905A - Coagulation monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coagulation monitoring system suitable for grasping the coagulated state of suspended matters in treated water in a coagulation treatment process, and optimizing coagulation conditions. SOLUTION: The system is provided with a measurement tank 5 which selectively stores the treated water sampled from the upstream side and downstream side of a coagulation tank 4, respectively, a probe 8 which irradiates the treated water housed in the measurement tank with a laser beam which is amplitude- modulated at a prescribed frequency, and receives scattered light generated by the collision of the laser beam with particles in the treated water, an operation part 30 which determines the state of the particles in the treated water on the basis of amplitude-modulated frequency components in the photoelectric conversion outputs of the scattered light received through the probe, and a coagulation process control part 40 which evaluates the coagulation reaction of the treated water from the state of the particles in each treated water of the upstream side and downstream side of the coagulation treatment process obtained by the operation part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coagulation monitoring system suitable for evaluating the coagulation reaction state of treated water subjected to coagulation treatment after a coagulation agent is added thereto after the coagulation agent is added.

[0002]

[Related Background Art] In the purification treatment (water quality improvement treatment) of purified water, industrial water, waste water, etc., for example, a coagulant is added to the water to be treated, and a suspended substance in the water to be treated is subjected to a flocculation treatment. It is realized by solid-liquid separation of floc using a method such as sedimentation separation, pressure flotation separation, centrifugation, sand filtration, membrane separation and the like. However, the coagulation state of the suspended solids in the treated water cannot be changed depending on the water quality (pH concentration) of the water to be treated, the amount of the coagulant added in the coagulation process, the stirring conditions, and the like. If it is not set properly, it will adversely affect the subsequent solid-liquid separation treatment or cause the quality of the treated water to deteriorate.

[0003]

Therefore, conventionally, the turbidity of the treated water is measured from the intensity of the scattered light generated by the treated water when the treated water is irradiated with light, and the turbidity of the treated water is measured based on the turbidity. It has been proposed that the state of aggregation of the suspended substance be evaluated in real time to optimize the aggregation conditions in the aggregation treatment step (Japanese Patent Application Laid-Open No. Hei 5-505026). However, in this case, since only the average scattered light intensity due to the treated water is measured, it is not possible to distinguish between the scattered light due to the aggregates in the treated water and the scattered light due to the non-aggregates (suspended matter). There is.

[0004] Incidentally, the scattered light intensity is proportional to the number of particles of the suspended substance in the treated water and is proportional to the fourth to sixth power of the particle diameter. When the flocculation of the suspended substance progresses in the flocculation treatment, the intensity of the scattered light gradually decreases as the number of particles in the treated water decreases. On the other hand, the particle diameter increases due to the flocculation of the suspended substance. ) The scattered light intensity per one increases. Therefore, in the above-described measurement of the average scattered light intensity, since a mixture of the scattered light due to the aggregate and the unaggregate exhibiting the change in the scattered light intensity as described above is detected, the aggregation state There is a problem that can not be properly grasped.

[0005] Even if the state of aggregation of the suspended substance in the treated water can be ascertained, the aggregation rate (flock growth rate) cannot be ascertained. Can't know what the factors are. Therefore, the coagulation conditions, specifically, the injection amount of the coagulant, the rapid stirring time in the stirring tank after the addition of the coagulant, and the slow coagulation (residence) time in the subsequent coagulation tank are optimized. It is difficult.

The present invention has been made in view of such circumstances, and an object of the present invention is to evaluate the coagulation reaction state of treated water subjected to coagulation through an agglomeration process after a coagulant is added. An object of the present invention is to provide a coagulation monitoring system suitable for optimizing the coagulation conditions. In particular, the present invention grasps the state of aggregation of the suspended substance in the treated water with high precision in real time, and grasps the aggregation rate (the growth rate of floc due to the aggregation of the suspended substance) to determine the aggregation conditions in the aggregation processing step. It is an object of the present invention to provide an agglutination monitoring system that can easily optimize the agglutination.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, an agglutination monitoring system according to the present invention comprises:
A measuring tank for selectively containing treated water sampled from the upstream and downstream sides of the flocculation tank in the flocculation treatment step, and (b) a probe provided in the measurement tank, for example, at a predetermined frequency. Along with irradiating the treated water contained in the measuring tank with the modulated laser light obtained by amplitude modulation,
A probe for receiving scattered light generated by collision of the laser light with the particles in the treated water; and (c) a modulation component of the laser light in a photoelectric conversion output of the scattered light received via the probe (for example, An arithmetic processing unit for obtaining a state of particles in the treated water (aggregation state of suspended matter) based on the amplitude modulation frequency component); and (d) treated water upstream of the agglutination treatment step accommodated in the measurement tank. Comparing the state of the particles obtained by the arithmetic processing device and the state of the particles obtained by the arithmetic processing device in the processing water downstream of the aggregating process housed in the measurement tank in the aggregating process An agglomeration process management means for evaluating the agglutination reaction of the treated water is provided (first invention).

That is, the present invention (the first invention) uses a probe that irradiates a modulated laser beam into treated water and receives scattered light generated by collision of the laser beam with particles in the treated water. Eliminating the influence of extraneous light mixed into the probe by determining the modulation component of the laser light in the photoelectric conversion output of the scattered light detected via a probe,
Then, the state of the particles in the treated water (the state of aggregation of the suspended matter) is determined based on the modulated component of the laser light of the photoelectric conversion output. The treatment water sampled from the upstream side and the downstream side of the process (coagulation tank) is provided in a measurement tank for selectively storing the treated water, and the treated water on the upstream side of the coagulation treatment step (coagulation tank) stored in the measurement tank is provided. Of the particles in the treated water downstream of the flocculation treatment step (coagulation tank) and the state of the particles in the treated water are compared to determine the state of the treated water in the flocculation treatment step. (Aggregation rate) is evaluated.

Preferably, the measuring tank is provided with a means for additionally adding a flocculant to the treated water stored in the measuring tank. Then, the state of the particles in the treated water after the additional addition of the flocculant (the state of aggregation of the suspended substance) is determined, and compared with the state of the particles in the treated water before the additional supply of the flocculant, the amount of the flocculant added is determined. It is characterized in that it is possible to judge the suitability of the above. When the treated water sampled from the downstream side of the coagulation treatment step (coagulation tank) is stored in the measurement tank,
By comparing the state of the particles in the treated water with the state of the particles in the treated water after the elapse of a predetermined time, it is possible to determine whether the residence time in the flocculation tank is appropriate.

Further, the coagulation monitoring system according to the present invention is provided with (e) a coagulation treatment step, for example, provided on the upstream side and the downstream side of the coagulation tank, respectively. And (f) first and second probes for irradiating the laser light into the treated water and receiving the scattered light generated by the collision of the laser light with the particles in the treated water. Arithmetic processing apparatus for respectively obtaining the state of particles in each of the processing water on the upstream side and the downstream side of the aggregation processing step based on the modulated component of the laser light in the photoelectric conversion output of the scattered light received via the probe. And (g) the state of the particles in the treated water on the upstream side of the agglutination treatment step obtained by the arithmetic processing unit, and the particles in the treated water on the downstream side of the agglutination treatment step By comparing the state is characterized by comprising the aggregation process control means for evaluating the agglutination of the treated water in the coagulation process (second invention).

That is, the present invention (second invention) provides the above-described probe on the upstream side and the downstream side of the agglutination treatment step (aggregation tank), respectively, so that the upstream and downstream sides of the agglutination treatment step are provided. The state of the particles in each treatment water is obtained directly and in real time, and the state of these particles is compared to evaluate the aggregation reaction (aggregation rate) of the treatment water in the aggregation treatment step.

Further, in addition to the second invention, the coagulation monitoring system according to the present invention further comprises: (h) a measuring tank for sampling and storing treated water downstream of the coagulation treatment step; Means for additionally adding a coagulant to the treated water contained in the measuring tank; and (j) irradiating the modulated water provided in the measuring tank with the modulated laser light into the treated water contained in the measuring tank, and A third probe for receiving scattered light generated by collision with particles in the treated water, and (k) in the aggregating treatment step managing means,
The state of the particles in the processing water on the upstream side of the aggregation processing step, the state of the particles in the processing water on the downstream side of the aggregation processing step, and the state of the particles in the processing water stored in the measurement tank determined by the arithmetic processing device The third embodiment is characterized in that the agglutination reaction of the treated water in the agglutination treatment step is evaluated in comparison with each other (third invention).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an aggregation monitoring system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the aggregation monitoring system according to the first embodiment. The coagulation treatment step of the water treatment apparatus in which this coagulation monitoring system is incorporated is a method in which treated water (raw water) RW composed of purified water, industrial water, waste water, etc., and an organic or inorganic coagulant C are pumped through pumps 1 and 2. The raw water RW and the coagulant C are supplied to the stirring tank 3 at a constant rate, and the raw water RW and the coagulant C are rapidly stirred and mixed. The suspension in the treated water is agglomerated for a predetermined period of time with rapid stirring, and then the treated water PW is sent to the next step (solid-liquid separation step) not shown.

The feature of this coagulation monitoring system is that a first valve 6 which samples mixed water (processed water) MW from the upstream side of the coagulation tank 4 in the coagulation treatment step and guides the mixed water (treatment water) to the measurement tank 5 is provided. A second valve 7 for sampling the treated water PW from the downstream side of the coagulation tank 4 and guiding the treated water PW to the measurement tank 5, and selecting the measurement tank 5 by using a probe 8 provided in the measurement tank 5. The state of the suspended particles in the treated water MW and the treated water PW and the state of the particles composed of the flocs thereof are respectively detected, and the states of the particles are compared, whereby the aggregation treatment step, particularly the aggregation tank, is performed. 4 is configured to evaluate the aggregation reaction of the treated water.

The probe 8 has a first optical fiber 8a for irradiating a modulated laser beam, for example, a laser beam amplitude-modulated at a predetermined frequency into the treated water, as will be described later.
And a second optical fiber 8 for receiving scattered light generated by collision of the laser light with particles contained in the treated water.
and b is fixed to a predetermined base 8c with the fiber end faces close to each other as shown in FIG. The probe 8 has a size of about 1 to 2 mm as a whole.

The optical fibers 8a and 8b include:
A fiber having a core diameter of about 0.1 mm is used and fixed to the pedestal 8c so that the central axes at the end faces of the fibers intersect at an angle of 90 °. And the optical fiber 8a,
8b at a position where the central axes of the respective end faces intersect.
It is configured to irradiate a laser beam to a minute area S having a diameter of about 0.4 mm and receive scattered light generated in the area S. The pedestal 8c also has a role of blocking external light (natural light) entering from above the probe 8 from reaching the region S.

The state of the suspended matter in the treated water MW, PW and the state of the particles composed of the flocs thereof using the probe 8 having such a structure is detected by the light emitting unit 10 as shown in FIG. The modulated laser light (laser light amplitude-modulated at a predetermined frequency) L is irradiated into the treated water via the probe 8 (first optical fiber 8a), and the laser light collides with particles contained in the treated water. Scattered light S generated
Is received by the light receiving section 20 via the probe 8 (second optical fiber 8b).

The light emitting section 10 has, for example, a wavelength of 630 n.
and a laser oscillator 11 such as a laser diode which oscillates and outputs the laser light L of m.
And an amplitude modulator 12 such as a function generator for electrically performing amplitude modulation (AM modulation) at Hz). Further, the light receiving unit 20 includes a photoelectric converter 21 such as a phototransistor that generates an electric signal corresponding to the amount of received scattered light S (received light intensity), and extracts only the amplitude-modulated frequency component from the photoelectric conversion output. A band-pass filter (BPF) 22 that performs the above-described operation, and a detector 24 that detects the signal F of the amplitude modulation frequency component obtained by amplifying the output of the band-pass filter 22 through an amplifier 23 and obtains an envelope component E thereof. It is configured with.

The amplitude modulation of the laser beam L modulates the scattered light S generated by the irradiation of the laser beam L into the treated water, thereby playing a role of distinguishing it from extraneous light such as natural light mixed into the treated water. I am carrying it. Therefore, the photoelectric converter 2
By filtering the output of No. 1 through the band-pass filter 22, it is possible to extract only the component of the scattered light S by the laser light L irradiated into the treated water as the frequency component of the amplitude modulation.

Considering the scattered light generated in the above-mentioned minute area S irradiated with the laser beam L, the intensity of the scattered light generated by the minute colloid particles made of the suspended substance in this area S is small. It increases in proportion to the number of. The number of microcolloid particles decreases as flocculation proceeds and flocs having a large particle diameter are generated. On the other hand, since flocs are formed by agglomeration of fine colloid particles, the number thereof increases as the aggregation proceeds, but the number is much smaller than that of the fine colloid particles. Therefore, the possibility that the flocks are present in the above-described minute area S is extremely low, and the flocks rarely enter the minute area S. However, the frequency of the flocks entering the minute area S increases as the number of flocs increases with the progress of aggregation.

Accordingly, when the intensity of the scattered light in the minute area S is measured using the probe 8 described above, FIG.
As shown in (c), the scattered light of the micro area S detected by the probe 8 is detected as the number of micro colloid particles decreases and the number of flocs gradually increases as the aggregation of the suspended substance progresses. Although the strength may temporarily increase due to the floc, the strength is reduced as a whole. Therefore, except for the case where the scattered light intensity is temporarily increased due to the presence of the floc, focusing on the overall scattered light intensity, the scattered light intensity at that time is determined by the number of unaggregated colloid particles. It can be regarded as indicating.

The minimum value detection circuit 25 shown in FIG.
Based on such a viewpoint, by detecting the lowest value of the envelope component E of the signal F of the amplitude modulation frequency component obtained from the photoelectric conversion output according to the intensity of the scattered light described above, in the treated water. The state of the particles (the number of unagglomerated colloid particles) is determined. By paying attention to the period in which the intensity of the scattered light temporarily increases due to the floc, it is possible to obtain the number of flocs generated by the aggregation (the density of the floc in the treated water). It is also possible to determine the particle size of the floc from the size.

Returning to the description of the coagulation monitoring system shown in FIG. 1, in this system, the first valve 6 and the second valve 7 managed by the coagulation process management unit 40 are selectively opened, First, the mixed water (treated water) MW is sampled from the upstream side of the coagulation tank 4 and stored in the measurement tank 5, and the calculation unit 30 supplies the mixed water (processed water) to the coagulation tank 4 based on the intensity of the scattered light detected using the probe 8. Thus, the state of the particles in the state before the aggregation treatment is performed is determined. Thereafter, the mixed water (treated water) MW is drained, the second valve 7 is opened in place of the first valve 6, and the treated water PW is sampled from the downstream side of the coagulation tank 4 to measure the measurement water 5. In the same manner, the state of the particles in the state after the aggregation processing is performed in the aggregation tank 4 in the arithmetic unit 30 is obtained.

Thus, the coagulation process management section 40 is provided with the treated water M on the upstream side of the coagulation tank 4 obtained as described above.
By comparing the state of the particles in W and the state of the particles in the treated water PW on the downstream side of the flocculation tank 4, the state of progress of the flocculation in the flocculation tank 4 is obtained. Specifically, from the difference between the state of the particles (scattered light intensity) on the upstream side of the coagulation tank 4 and the state of the particles (scattered light intensity) on the downstream side of the coagulation tank 4, the progress of the coagulation in the coagulation tank 4 is determined. By calculating the number of suspended substances (micro colloid particles) that decreased with the evaluation, the progress of the aggregation is evaluated.

In particular, the coagulation process control section 40 evaluates the progress of the coagulation in consideration of the slow coagulation (residence) time in the coagulation tank 4 to evaluate the coagulation reaction rate (flock growth rate). It is something to do. The slow coagulation (residence) time in the coagulation tank 4 is, for example, an amount per unit time for feeding the raw water RW and the coagulant C,
It can be calculated from the capacity of the coagulation tank 4.

The coagulation process management unit 40 holds the treated water PW sampled in the measurement tank 5 on the downstream side of the coagulation tank 4 for a predetermined time to further advance the coagulation.
It has a function to determine the state of the particles (scattered light intensity) at that time. In other words, when the slow aggregation (residence) time, which is one of the aggregation conditions, is extended by adding the slow aggregation (residence) time in the measurement tank 5 to the slow aggregation (residence) time in the aggregation tank 4. Is set, and the state of the particles (scattered light intensity) at that time is obtained. The progress of the aggregation is evaluated in consideration of the state of the particles at this time to determine whether the slow aggregation (residence) time is appropriate.

When the slow coagulation (residence) time is prolonged and the scattered light intensity is reduced (when the number of microcolloid particles as a suspended substance is reduced), the coagulant C is used.
Is determined to be insufficient or the slow aggregation (residence) time in the aggregation tank 4 is insufficient. Conversely, if the scattered light intensity does not change even if the slow aggregation (residence) time is extended, it is determined that the amount of the coagulant C added is excessive.

Further, the coagulation process management section 40 is provided with the coagulation tank 4
When the treated water PW on the downstream side of the sampler is sampled in the measuring tank 5, the treated water PW stored in the measuring tank 5 using the pump 9
Has a function of additionally adding a predetermined amount of the coagulant C described above. By determining the state of the particles (scattered light intensity) when the amount of the coagulant C is increased, it is determined whether the amount of the coagulant C is excessive or insufficient. Incidentally, when the scattered light intensity decreases when the amount of the coagulant C added is increased (when the number of the microcolloidal particles as the suspended substance decreases), it is determined that the amount of the coagulant C is insufficient. Is determined. However, when the scattered light intensity does not change even when the amount of the coagulant C is increased, the amount of the coagulant C is excessively large, or the slow coagulation (residence) time in the coagulation tank 4 is increased. Determined to be too long.

As described above, the states of the particles in the treated water MW and PW on the upstream side and the downstream side of the flocculation treatment step (coagulation vessel 4) selectively sampled in the measurement tank 5 are detected, and the flocculation treatment is performed. According to the present agglutination monitoring system for evaluating the agglutination reaction state of a suspended substance in a process, the agglutination state of treated water can be accurately grasped. In addition, not only changes in the coagulation reaction state due to changes in the water quality of the raw water RW, but also an excess or deficiency in the amount of coagulant C
It is possible to accurately evaluate coagulation conditions such as excessive and insufficient slow coagulation (residence) time. Therefore, it is easy to optimize coagulation conditions in the coagulation process according to the evaluation result, and it is possible to efficiently operate the coagulation process.

In the embodiment described above, the treated water is selectively sampled from the upstream and downstream sides of the coagulation tank 4 using the first and second valves 6 and 7 and stored in the measurement tank 5. Then, the suspended substances (micro colloid particles) contained in the treated water and the state of flocs generated by the training were detected. For example, as shown in FIG. May be provided, and the state of the particles in the treated water on the upstream side and the downstream side of the aggregation treatment step may be measured in real time.

In the second embodiment of the coagulation monitoring system shown in FIG. 5, the same parts as those of the coagulation monitoring system shown in FIG. 1 are denoted by the same reference numerals. That is, in the agglutination monitoring system shown in FIG. 5, the state of the particles in the treated water on the upstream side of the aggregating treatment step (aggregation tank 5) is directly measured using the probe (first probe) 8 provided in the stirring tank 3. The state of particles in the treated water (treated water downstream of the flocculation tank 5) discharged from the flocculation tank 4 by the probe (first probe) 8 which is detected in real time and provided in the flocculation tank 4 Directly
It is configured to detect in real time.

Also in this coagulation monitoring system, a valve 7 for sampling the treated water PW discharged from the coagulation tank 5 and a measuring tank 5 for accommodating the treated water PW sampled via the valve 7 are provided. The measurement tank 5 is also provided with a probe 8, and the detection of the state of the particles in the treated water using the measurement tank 5 is performed in the same manner as in the previous embodiment.

According to the coagulation monitoring system constructed in this manner, not only the same effects as in the previous embodiment can be obtained, but also the coagulation conditions can be adjusted while detecting a change in water quality of the raw water RW in real time. And the like. Further, since it is not necessary to selectively open the two valves 6 and 7 to sample the treated water on the upstream side and the downstream side of the coagulation tank 5 and to selectively store them in the measurement tank 5, the measurement tank 5 is not required. There is no need for the time required for changing the processing water to be stored in the container, and it is also possible to greatly reduce the processing time required to grasp the state of the agglutination reaction.

The present invention is not limited to the above embodiments. For example, in the embodiment, after extracting the amplitude modulation frequency component of the photoelectric conversion output of the scattered light, the state of the particles in the treatment water is obtained from the lowest value of the envelope component E. When the frequency component is smoothed, the state of the particles in the treated water may be obtained from the signal level or the like. It is also possible to measure the state of the particles in the treated water at three or more different measurement points in the aggregation processing step, respectively, and to monitor the state of the aggregation processing.

In the embodiment, the laser light amplitude-modulated at a predetermined frequency is used as the modulated laser light for detecting the state of the particles in the treated water. However, the laser light is phase-modulated or frequency-modulated. May be used. In this case, the phase modulation component and the frequency modulation component may be respectively detected from the photoelectric conversion output corresponding to the intensity of the scattered light to detect the state of the particles in the treated water. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0036]

As described above, according to the present invention, not only the state of the particles in the treated water in the agglutination treatment step can be easily and accurately measured, but also the agglutination reaction such as the growth rate of floc. Since it is possible to grasp the time, it is possible to obtain a great effect in practical use, such as easily optimizing the coagulation conditions according to the quality of the treated water.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an aggregation monitoring system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a probe used in the aggregation monitoring system.

FIG. 3 is a view showing the concept of processing for detecting the state of particles in treated water using the probe shown in FIG. 2;

FIG. 4 shows the aggregation of suspended substances (micro colloid particles).
The figure which shows typically the mode of the change of the scattered light intensity in the micro area | region S.

FIG. 5 is a schematic configuration diagram of an aggregation monitoring system according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 Stirring tank 4 Coagulation tank 5 Measurement tank 6 Valve (Sampling means of treated water) 7 Valve (Sampling means of treated water) 8 Probe 10 Light emitting unit 20 Light receiving unit 30 Operation unit 40 Aggregation process management unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01N 33/18 G01N 33/18 A F term (Reference) 2G059 AA05 BB06 DD03 DD05 DD12 EE02 GG01 GG06 JJ17 KK01 LL04 MM01 MM04 4D015 BA21 BB06 EA03 EA07 EA32

Claims (4)

[Claims] 1. A measuring tank for selectively storing treated water sampled from each of an upstream side and a downstream side of an agglomeration processing step, and a processing provided in the measuring tank and receiving modulated laser light in the measuring tank. A probe that irradiates the water with water and receives scattered light generated by collision of the laser light with particles in the treated water; and modulation of the laser light in a photoelectric conversion output of the scattered light received via the probe. An arithmetic processing device that determines the state of the particles in the treated water based on the components, and the state of the particles determined by the arithmetic processing device in the treated water upstream of the aggregating process housed in the measurement tank,
And a flocculation process management for evaluating the flocculation reaction of the treated water in the flocculation treatment process by comparing the state of the particles obtained by the arithmetic processing device in the treatment water downstream of the flocculation treatment process accommodated in the measurement tank. And a means for monitoring coagulation. 2. The coagulation monitoring system according to claim 1, wherein the measurement tank includes means for additionally adding a coagulant to the treated water stored in the measurement tank. 3. A method of irradiating a modulated laser beam, which is provided on each of the upstream side and the downstream side of the aggregating process step, into the processing water on the upstream side and the downstream side of the aggregating process step, and performing the respective processes of the laser beam First and second probes for receiving scattered light generated by collision with particles in water; and the laser light in a photoelectric conversion output of the scattered light received via the first and second probes, respectively. An arithmetic processing unit that obtains the state of the particles in each processing water on the upstream side and the downstream side of the aggregation processing step based on the modulation component of the processing water; and the processing water on the upstream side of the aggregation processing step obtained by the arithmetic processing unit. The state of the particles and the state of the particles in the treatment water on the downstream side of the aggregation treatment step are compared to evaluate the aggregation reaction of the treated water in the aggregation treatment step. Aggregation monitoring system characterized by comprising a coagulation process control means. 4. The flocculation monitoring system according to claim 2, further comprising: a measuring tank for sampling and storing the treated water downstream of the flocculation treatment step; and adding a flocculant to the treated water contained in the measuring tank. Means for inputting, irradiating the modulated water provided in the measuring tank with the modulated laser light into the processing water contained in the measuring tank, and receiving scattered light generated by collision of the laser light with the particles in each of the processing waters. A third probe, wherein the aggregation processing step management means is configured to determine a state of particles in the processing water on the upstream side of the aggregation processing step and a state of the particles in the processing water on the downstream side of the aggregation processing step, which are determined by an arithmetic processing unit. And evaluating the agglutination reaction of the treated water in the aggregating treatment step by comparing the state of the particles in the treated water accommodated in the measurement tank, respectively. Aggregation monitoring system that.