JPH08313434A - Automatic measuring apparatus for transparency and amount of floating matter in water treatment - Google Patents

Abstract

PURPOSE: To provide a measuring apparatus which enables measuring of transparency and the amount of a floating matter of a liquid to be measured automatically and continuously and moreover is free from measuring errors ascribed to personal difference in a high level treatment monitoring and control for waste sewage treating equipment or the like. CONSTITUTION: An automatically measuring apparatus with a signal processor 8 is provided. A laser light source 4 is fixed outside one optical window 2a arranged at both end opening parts of a non-light transmitting measuring cell 1 while a photodetector 5 is fixed outside the other optical window 2b and the degree of attenuation of a laser light incident on a liquid 11 to be measured passing continuously through the measuring cell 1 from the laser light source 4 is received by the photodetector 5 to obtain the transparency and the amount of a floating matter of the liquid 11 to be measured by signal processing and arithmetic processing of the quantity of the received light. Moreover, a defoaming tank is arranged at a position higher than that of the measuring cell 1 separately and after a defoaming with the defoaming tank, the liquid to be measured is sent into the measuring cell 1 to determine the transparency and the amount of the floating matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically measuring the degree of transparency and the amount of suspended matter, which is one of the water quality indicators of treated water in sewage treatment facilities, river water, lake water and the like.

[0002]

2. Description of the Related Art Conventionally, the method of measuring the transparency of treated water, river water, lake water, etc., or the amount of suspended solids (ss component) of a sewage treatment facility has been published by the Japan Sewer Association. Method (1984 edition) ”, page 96,“ Transparency ”, and test method, page 314,“ Floating substances ”.

As defined by this "sewer test method", "transparency" indicates the degree of clearness of water, and a double layer is placed on the bottom of the fluorometer when the measurement is performed. The height of the water layer at the time when the cross sign plate can be identified for the first time is read, and 1 cm is represented as 1 degree.
As a fluoroscope, the height is 32 cm, and the diameter is 3.3 to 3.5 c.
m, the height from the bottom is 5 cm, and the instrument is a flat-bottomed glass cylinder graduated in 0.5 cm increments with a double cross-marking plate attached to the bottom of the fluorometer. Let the liquid flow out from the lower mouth while seeing through the bottom from
I read the scale on the water surface when the double cross at the bottom is clearly identifiable to obtain the transparency.

As another method, there is a means for obtaining the above-mentioned transparency from the measured value of a turbidimeter known as a scattered light quantity method, a scattered light quantity / transmitted light quantity method, or an integrating sphere method.

On the other hand, "suspended substance" means a substance separated by the glass fiber filter method or the centrifugal method.

[0006]

However, in such a method for measuring the degree of transparency and the amount of suspended matter in water treatment, continuous measurement is difficult because the measurement operation is not automated, and changes in water quality over time are difficult. There is a problem that it cannot be accurately grasped. Especially in the sewage treatment plant, although the transparency of the measured liquid is an important index for evaluating the treated water quality, continuous information cannot be obtained regarding this transparency, so the state of water quality change is fed back to the operation. There was a problem that I could not do it.

From the viewpoint of operation, it is necessary for the measurer to go to the water sampling point for each measurement, which requires a great deal of time and labor. Since the measurement is the basis, there is a problem in that there is an error in the measured value due to individual differences, or the measured values may vary even for the same sample.

In view of the above-mentioned problems, the present invention measures the amount of transmitted attenuation light by using an optical device while automatically collecting the liquid to be measured and then automatically discharging the liquid to be measured, and then makes it possible to see through the liquid to be measured by signal processing and arithmetic processing. Determining the degree and suspended matter concentration enables automatic and continuous measurement regardless of daytime or nighttime, and there is no measurement error due to individual differences. An object of the present invention is to provide a device for automatically measuring the degree of transparency and the amount of suspended matter that can be used as an index.

[0009]

In order to achieve the above object, the present invention provides a laser light source on the outside of one of the optical windows provided at both end openings of a measurement cell having light opacity. Fix and fix the light receiver on the outside of the other optical window, and receive the attenuated light amount of the laser light incident on the liquid to be measured that continuously flows from the laser light source between the inlet and outlet provided in the measurement cell. (EN) An automatic measuring device of the transparency and the amount of suspended matter, which is provided with a signal processing device which receives the light by a container and calculates the transparency and the amount of suspended matter of a liquid to be measured by signal processing and calculation processing of the received light amount.

A light receiving amount amplifier, a signal processing device and a recorder are installed in the above light receiving device to convert the light amount of the incident laser light into an electric signal and amplify the electric signal, and then the attenuated light amount (mV) and the transparency (cm) and Based on the correlation of the amount of suspended solids (mg / l), the transparency of the liquid to be measured and the amount of suspended solids are obtained and recorded in a recorder. The attenuated light amount (mV) is calculated by the received light amount IL when the measurement cell is filled with pure water and the transmitted light amount TL when the measured liquid is filled.

Further, according to claim 4, a defoaming tank is separately provided at a position higher than the measuring cell, and the liquid to be measured flows into the defoaming tank to be defoamed and then sent to the measuring cell to measure the measuring principle. The present invention provides an apparatus for automatically measuring the degree of transparency and the amount of suspended matter in water treatment, in which the degree of transparency and the amount of suspended matter of a liquid to be measured are obtained based on the above.

[0012]

According to such an apparatus for automatically measuring the degree of transparency and the amount of suspended solids, when the solution to be measured is continuously flowed into the measuring cell by the pump, the solution to be measured in the measuring cell is fed from the laser light source through the optical window. The laser light is incident, and the light amount of the laser light attenuated by the liquid to be measured is received by the light receiver. The light quantity of the laser light obtained by the light receiver is converted into an electric signal, and then the signal is amplified by the light quantity amplifier, and the calculation processing in the signal processing device and the attenuated light quantity (mV) and the transparency (cm) and log (attenuation) are performed. The output which has a direct relationship with the transparency and the amount of attenuated light which correlates with the amount of suspended solids are recorded in a recorder from the relationship of the amount of light), and the transparency and the amount of suspended solids of the liquid to be measured are obtained.

The signal processing device performs noise removal and peak cut processing of the amplified received light amount, obtains log (attenuated light amount) by calculation, and outputs it to the recorder.
The above-mentioned attenuated light amount (mV) can be obtained by calculation from the received light amount IL (blank received light amount) when the measurement cell is filled with pure water and the transmitted light amount TL when the measurement liquid is filled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the apparatus for automatically measuring the degree of transparency and suspended solids in water treatment according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing a basic embodiment of an automatic fluoroscopy measuring apparatus according to the present invention, in which 1 is a cylindrical or rectangular measuring cell with both ends open. Optical windows 2a and 2b are provided at the openings of both ends of the measurement cell 1, and a laser light source 4 is fixed to a support body 3a fitted and fixed in proximity to the outside of one optical window 2a, and the other. The light receiver 5 is fixed to the support body 3b which is fitted and fixed close to the outside of the optical window 2b. A power source 6 is connected to the laser light source 4, and a light receiving amount amplifier 7, a signal processing device 8 and a recorder 9 are installed in the other light receiving device 5.

The measuring cell 1 is made of a light-impermeable metal or synthetic resin tube, and the optical windows 2a and 2b are made of a light-transmitting material. An inflow port 10 for the liquid to be measured 11 is provided at one end of the measuring cell 1, and a pump 12 for feeding the liquid to be measured 11 into the measuring cell 1 is provided in the vicinity of the inflow port 10. An outlet 13 for the liquid to be measured 11 is provided at the other end of the measurement cell 1, and a drain pipe 14 is connected to the outlet 13.

In the measuring cell 1, the position of the outlet 13 is set so that bubbles contained in the liquid 11 to be measured can easily escape to the outlet 13 along the upper wall of the measuring cell 1 as much as possible. It is preferable to install the measuring cell 1 in a tilted manner so that it is located at a position higher than 10. Experimentally, the measuring cell 1 was set at 5 degrees
It is preferable to incline in the range of 20 degrees.

The operation of the automatic transparency measuring device is as follows. First, by activating the pump 12, the liquid to be measured 11 is continuously flown into the measuring cell 1, and at the same time, power is supplied from the power source 6 to the laser light source 4, whereby the liquid to be measured 11 in the measuring cell 1 is laser light source. 4 to optical window 2
Laser light is incident toward the light receiver 5 via a and 2b. Then, the light receiver 5 receives the light amount of the laser light attenuated by the measured liquid 11.

In the experiment, treated water from an actual sewage treatment plant was used as the liquid to be measured 11, and the optical path length of the measuring cell 1, that is, the distance between the optical windows 2a and 2b was set to 80 cm. The optical path length of the measuring cell 1 is preferably in the range of 60 cm to 100 cm.

The light quantity of the laser light obtained by the light receiver 5 is converted into an electric signal, and then the signal is amplified by the received light quantity amplifier 7, and the signal processing device 8 performs predetermined arithmetic processing and the non-uniformity of the measured liquid 11. Attenuated light amount (mV) is recorded in the recorder 9 after the "flare" of the signal caused by the inflow of foreign matter or foreign substances and the inclusion of bubbles is removed.

FIG. 2 is a graph showing the relationship between the attenuated light amount (mV), the transparency (cm, visual test) and the logarithm (attenuated light amount), which is the natural logarithm, obtained by the above measurement. The attenuated light amount (mV) can be calculated by the received light amount IL (blank received light amount) when the measurement cell 1 is filled with pure water and the transmitted light amount TL when the measured liquid 11 is filled.

FIG. 3 is a graph showing the relationship between the amount of attenuated light (mV) and the amount of suspended matter (mg / l). The optical path length is 80 cm, which is the same as the above, and the blank light reception amount is 9.96. According to FIG. 3, it was found that the correlation coefficient r = 0.998, and a good correlation was obtained between the amount of suspended solids (mg / l) and the amount of attenuated light (mV).

Therefore, the signal processing device 8 performs noise removal and peak cut processing of the amplified received light amount, obtains log (attenuated light amount) by calculation, and outputs an output having a direct relationship with the transparency and the amount of suspended matter. It has a function of outputting a correlated amount of attenuated light to the recorder 9.

FIG. 4 is a schematic diagram showing another embodiment of the present invention, in which the same components as those of the basic embodiment of FIG. 1 are indicated by the same reference numerals. In this embodiment, a defoaming tank 15 is separately provided at a position higher than the measurement cell 1,
By operating the submersible pump 16 and opening / closing the valve V ₁ , the liquid to be measured 11 is once introduced into the defoaming tank 15 to be defoamed, and then the liquid to be measured 11 is measured from the inlet 10 by opening / closing the valve V _2. The light is made to flow into the cell 1 and the amount of attenuated light (mV) is measured based on the above-mentioned measurement principle. still,
V ₃ is a valve for tap water inflow to the measurement cell 1 connected to the vicinity of the inflow port 10 of the measurement cell 1, and as described above, the received light amount IL (blank light reception when the measurement cell 1 is filled with pure water). It is installed to calculate (quantity), and IL can be automatically calculated. V ₄ and V ₅ are drain valves for draining water from the defoaming tank 15 and the measuring cell 1.

In the case of this embodiment, the structure of the measuring cell 1 itself is the same as that of the basic embodiment, but the liquid to be measured 11 is supplied from the submersible pump 16 to the measuring cell 1 through the defoaming tank 15. By appropriately maintaining the positional relationship between the defoaming tank 15 and the measurement cell 1, stable measurement can be performed even when the liquid to be measured 11 contains many bubbles.
Further, even if the pump flow rate changes due to a change in the water level of the liquid to be measured 11 or a voltage change, the defoaming tank 15 is located higher than the measuring cell 1, so that a constant amount of the measuring cell 1 is constantly exposed. The measurement liquid 11 is introduced to improve the measurement accuracy, and the variation in the measurement value is minimized.

After the measurement, the opening of the tap water inflow valve V ₃ installed to obtain the received light amount IL (blank received light amount) when the measuring cell 1 is filled with pure water is increased and the measurement is performed. By increasing the amount of water flowing into cell 1,
It is possible to remove stains adhering to the inside of the measurement cell 1 and the inner surfaces of the optical windows 2a, 2b, etc., which are in contact with the liquid to be measured 11 for a long time, and the cleaning effect can be enhanced.

[0027]

As described above in detail, according to the apparatus for automatically measuring the degree of transparency and the amount of suspended matter according to the present invention, the liquid to be measured is continuously flown into the measuring cell by a pump or the like, and is passed through the optical window. Laser light from the laser light source to the liquid to be measured in the measuring cell, the light amount of the laser light attenuated by the liquid to be measured is received by the light receiver, and the light amount is converted into an electrical signal before being received. The signal is amplified by the quantity amplifier, and the output in the direct relationship with the transparency and the amount of suspended matter are calculated from the relationship between the calculation processing and the attenuated light amount (mV) and the transparency (cm) and log (attenuated light amount) in the signal processing device. The transparency and the amount of suspended matter of the liquid to be measured can be calculated based on the correlated amounts of attenuated light.

In particular, the conventional turbidimeter is a method for obtaining a correlation with the weight of the suspension, and the scattered light quantity method, scattered light quantity / transmitted light quantity method, integrating sphere method, etc. are generally used. While there is a drawback that a good correlation with the transparency cannot be obtained, in the case of the present invention, it is possible to obtain the transparency with a simple method of taking a natural logarithm of the attenuation light amount using a laser beam having good parallelism as a light source. It is possible to obtain a very good correlation, and at the same time, it is possible to obtain the amount of suspended matter from the amount of attenuated light.

Since all of the measuring operations described in the present invention can be automated, continuous measurement can be carried out in a wastewater treatment facility without requiring human labor, and the water quality of treated water changes with time. It is possible to accurately grasp the state of water quality, especially in sewage treatment plants, the visibility is an important index to evaluate the quality of treated water, and the continuous change in the quality of water can be used to quickly detect the state of water quality change. It is possible to immediately feed back to the driving operation and perform appropriate control.

Also, from the viewpoint of operation, there is no need for the measurer to go to the water sampling point for measurement at the time of measurement, so that there is an advantage that a great deal of time and labor are not required, and measurement by individual differences due to visual measurement is possible. An automatic measuring device for transparency and suspended solids that can prevent errors in values and variations in measured values even with the same sample and can be used as indicators for advanced treatment monitoring and control of sewage, etc. Provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration example of an apparatus for automatically measuring the degree of transparency and the amount of suspended matter according to this embodiment.

FIG. 2 Attenuated light amount (mV), transparency (cm) and log
The graph which shows the relationship of (attenuation light quantity).

FIG. 3 is a graph showing the relationship between the amount of attenuated light (mV) and the amount of suspended solids (mg / l).

FIG. 4 is a schematic diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Measuring cell 2a, 2b ... Optical window 4 ... Laser light source 5 ... Photoreceiver 6 ... Power source 7 ... Received amount amplifier 8 ... Signal processing device 9 ... Recorder 10 ... Inlet 11 ... Measured liquid 12 ... Pump 13 ... Flow Outlet 15 ... Defoaming tank 16 ... Submersible pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shotaro Urushihara 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Stock Company Inside the company Meidensha (72) Inventor Shigeo Sato 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Stock Association Shameidensha

Claims (4)

[Claims] 1. A measurement cell is fixed from the laser light source by fixing a laser light source to the outside of one of the optical windows provided in the openings of both ends of the measurement cell having optical opacity and fixing the light receiver to the outside of the other optical window. The attenuated light quantity of the laser light incident on the measured liquid that continuously flows between the inlet and the outlet provided in the receiver is received by the light receiver, and the measured liquid is seen through the signal processing and calculation processing of this received light quantity. A device for automatically measuring the degree of transparency and the amount of suspended matter in water treatment, comprising a signal processing device for determining the degree and the amount of suspended matter. 2. A light receiving amount amplifier, a signal processing device, and a recorder are installed in the light receiving device to convert the light amount of the incident laser light into an electric signal and amplify the electric signal, and then the attenuated light amount (mV) and the transparency (cm). ) And the amount of suspended solids (mg / l), the transparency and the amount of suspended solids of the liquid to be measured are obtained and recorded in a recorder. measuring device. 3. The attenuation light quantity (mV) is calculated by calculation from a received light quantity IL when the measurement cell is filled with pure water and a transmitted light quantity TL when the measurement liquid is filled. The apparatus for automatically measuring the degree of transparency and the amount of suspended matter in the water treatment according to 2. 4. A measuring cell having a light-impermeable property, wherein a laser light source is fixed to the outside of one of the optical windows provided at the openings of both ends of the measuring cell and a photodetector is fixed to the outside of the other optical window, and the height is higher than that of the measuring cell. A defoaming tank is separately provided at a position, the liquid to be measured is introduced into the defoaming tank to defoam, and then continuously flows between the inflow port and the outflow port provided in the measurement cell, the laser light source. It is equipped with a signal processing device that receives the attenuated light amount of the laser light that has entered the liquid to be measured by the light receiver and calculates the transparency and the amount of suspended matter of the liquid to be measured by the signal processing and arithmetic processing of this received light amount. A device for automatically measuring the degree of transparency and the amount of suspended matter in water treatment, characterized by.