JPS582635A - Device for measuring water quality - Google Patents

Abstract

PURPOSE:To make it possible to measure the property of suspended material and to make it possible to forecast the effect of treatment, by making the level of water inspection constant, and providing a device for measuring light in a time series system and for computing the distribution of sedimentation velocity. CONSTITUTION:A lamp is used as a light source 6 of the water quality measuring device and a photocell is used as a light receiving part 7. The lower end of a water inspecting tube 3 is opened and connected to an inspecting water path 10, wherein a guide vane 11 is provided as a disturbance flow forming means. Meanwhile, the light receiving part 7 is constituted so that the light is measured in the time domain. The measured signal is connected to an A/D converter amplifier 12. An operator 13 is so constituted that the distribution of the sedimentation velocity is computed based on the signal from the amplifier 12 and the signal from a clock generator 14. Thus the property of the suspended material can be measured and the effect of the treatment can be predicted.

Description

[Detailed Description of the Invention] This invention relates to a water quality measuring device used in water treatment, etc.
In particular, the present invention relates to a water quality measuring device that makes it possible to measure the properties of suspended matter in sample water and predict treatment effects.

When performing activated sludge treatment of wastewater, turbidity meters,
Devices that detect the concentration of suspended matter in water are used as sludge concentration meters, MLSS meters, or sludge interface detectors. Such a water quality measuring device irradiates light onto a water test tube into which test water is introduced, and measures the transmitted light or scattered light at the light receiving part.
There are devices that measure the concentration of suspended matter in water. Conventionally, there is a device of this kind that has a piston installed in the water test tube, which slides on the wall of the water test tube to clean the wall and introduce test water, but in both cases, the test water is introduced. It was only possible to measure the concentration of suspended matter at one point in time when it was first introduced.

This invention improves the conventional device as described above, makes the flow of water introduced by the piston constant, and provides a device that measures light over time to calculate the sedimentation velocity distribution. The purpose of the present invention is to provide a water quality measuring device that enables constant measurement of the properties of the water, thereby making it possible to predict the treatment effect.

This invention includes a water test tube, a piston for introducing test water into the test water tube to a predetermined level, a means for forming turbulent flow in the test water introduced into the test water pipe, and a method for irradiating light onto the water test tube. This water quality measuring device includes a light source, a light receiving section that is provided corresponding to the light source and measures light over time, and an arithmetic device that calculates a sedimentation velocity distribution based on a measurement signal from the light receiving section.

Hereinafter, this invention will be explained with reference to the drawings. FIG. 1 is a vertical sectional view showing a water quality determination device according to an embodiment of the present invention. In the drawings, reference numeral 1 denotes a cylindrical main body, and 6 water test tubes made of transparent glass are attached to the *++ inner wall 1a with a spacer 2 in between; and mounting screws 4. Penetrators 15a and 5b are provided on the inner wall iaK so that their centers are located at the same height A, and a light source 6 and a light receiving portion 775 are provided at opposing positions through these through holes 5'a and 5b. A lamp can be used as the light source 6, and a photocell can be used as the light receiving section 7.

A piston 8 is inserted into the test tube O from the top so that it can move up and down, and a wiper seal 9 is formed around the tip of the piston, and the wiper seal 9 is designed to slide on the inner surface of the test tube O for sealing and cleaning. There is. The tip B of the piston 8 is set at a certain distance from A in the raised position. In addition, the lower end of the test water pipe 6 is opened and connected to the test water introduction path 10,
This test water introduction path 10 is provided with a guide vane 11 as a turbulence forming means. Guy, #, 1-711 is constructed by installing a plurality of twisted rectangular plates in the diametrical direction so as to give a turbulent flow similar to a swirling flow to the sample water passing through the sample water introduction path 10. ing.

The light receiving section 7 is configured to perform photometry over time, and is connected so that the measurement signal is given to an A/D conversion amplifier 12. Reference numeral 16 denotes a calculation device, which is configured to calculate the sedimentation velocity distribution based on the signal from the A/D conversion/increase device 12 and the clock signal from the clock generator 14.

Reference numeral 15 denotes a power supply device that supplies power to the light source 6, the A/D conversion amplifier device 12, the arithmetic device 16, and the clock generator 14.

The water quality measuring device configured as described above measures water quality by inserting the lower end of the main body 1 into a sampling box or the like connected to an activated sludge treatment device or the like, or by connecting a sludge supply pipe or the like to the lower end. During measurement, when the piston 8 is lowered to the lower end of the water test tube 6 (below the through holes 5a, 5b), the inner surface of the water test tube 6 is cleaned and deposits are removed. Next, when the piston 8 is pulled up, the sample water passes through the guide vane 11 and becomes a turbulent flow, and the suspended matter flows into the sample water pipe 3 in a uniformly dispersed state.
be introduced within. At this time, the lower end B6-j of the piston 8
It stops at a position a predetermined distance from A.

At the time point to when the piston 8 stops and suction of the sample water ends, the initial suspended solids concentration CO is measured.

To measure the concentration, light is irradiated from the light source 6 through the through hole 5a, and transmitted light or scattered light is transmitted through the through hole 5b to the light receiving section 7.
The measured signal is A/D converted and amplified in the A/D conversion amplifier 12. The signal from the A/D conversion amplifier 12 is used in the arithmetic unit 16 to calculate the concentration of suspended matter using a calibration curve prepared in advance showing the relationship between the amount of transmitted light and the concentration of suspended matter, and is stored. The concentration detected in this manner corresponds to the sludge concentration etc. detected in conventional devices.

Subsequently, the clock signal from the clock generator 14 causes 1. , 12 are measured and calculated in the same manner as the suspension concentration Ct at the time point, and L is stored in memory. During this time, the piston 8 is fixed upward, so that the suspended matter settles within the sample tube 6 over time. The above Ct measurement is carried out until the sedimentation of the suspended matter in the sample tube is almost completed.

In parallel with or after the above measurements and calculations, the calculation device 16 calculates the sedimentation velocity (v=L/l
) and concentration ratio (Ct/Co) are calculated,
The cumulative passing speed shown by curve a in FIG. 2 is calculated and stored. Curve a in Figure 2 is a cumulative passing velocity curve, with the horizontal axis representing v (m/h), or sedimentation velocity, and the vertical axis representing the concentration ratio ct/Co. It represents. and curve a
From this, the amount of change in curve a is calculated from the difference in CL/Co for each unit V amount, and the sedimentation velocity distribution shown in the curve in FIG. 2 is calculated.

Curve ib in FIG. 2 is a sedimentation velocity distribution curve, where the horizontal axis is the sedimentation velocity V and the vertical axis is the weight ratio, showing the weight ratio of the suspended material corresponding to the sedimentation velocity (■).

In the process of the above calculations, curves a and b are shown for clarity of explanation, but the curves do not need to be actually created and may simply be processed as data. Furthermore, although a case has been described in which the cumulative passing velocity is calculated in order to calculate the entire sedimentation velocity distribution, the sedimentation velocity distribution may be calculated through calculation of other numerical values. Even when calculating the cumulative passage speed through a trench, there is no need to calculate the actual concentration of each Ct.
t/C.

The relative increase/decrease ratio may be calculated.

The above operations are performed by controlling the stroke of the piston 8 with a limit switch (not shown) and by controlling the clock generator 14.
This is done by starting the timing of the t signal.

The sedimentation velocity distribution obtained from the above shows the distribution ratio for each sedimentation velocity in the water being tested. Therefore, the ratio of suspended matter in the sample water that settles easily and that that does not settle easily can be determined.
The areal load in the sedimentation separator can be calculated, and the concentration of suspended solids in the treated water can be predicted from the relationship with the throughput.

Therefore, based on such a calculation result, it is possible to change the area load in the sedimentation separator to perform treatment that matches the quality of the water to be treated.

In water treatment such as activated sludge treatment, conventional methods simply detect the concentration of suspended matter such as sludge in sample water.

Feedback control was used, but proper processing cannot be performed with such control. On the other hand, since the water quality measuring device of the present invention can measure the sedimentation velocity distribution, it is possible to measure not only the amount of suspended matter but also the properties related to sedimentation, and the results of treatment can be determined based on such measurement results. By making predictions, it is possible to set conditions that match the properties of the material and perform appropriate processing, and feedforward control can improve processing efficiency.

Note that one or more embodiments have a submerged structure, so they are used by putting them into a sampling box, but a joint may be provided so that they can be directly connected to a slurry supply pipe, etc. A charging pipe with a valve may be provided so that it can be used by charging it into a sludge tank or the like. Furthermore, the means for creating turbulent flow is not limited to the -711 guide, and means such as a screw may also be used, and a valve may be provided to perform this function. Furthermore, the present invention is applicable not only to the measurement of sludge in activated sludge treatment equipment but also to the measurement of water quality of other samples.

As described above, according to the present invention, the introduction level of the test water by the piston is kept constant, and the settling velocity distribution is calculated by photometry over time, so that the sedimentation rate of suspended matter in the test water can be calculated. The properties can be measured and the treatment effect can be predicted from this 1V, so that the treatment that matches the properties of the water to be treated can be performed by feedforward V control. In addition, it is also possible to measure the initial concentration and the concentration over time of the sample water, and it can be used for a variety of purposes.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a graph showing a cumulative passing velocity curve and a sedimentation velocity distribution curve. 3. Water test tube, 6. Light source, 7. Light receiving section, 8. Piston,
9.Wiper seal, 1.To guide vane Agent: Sei Yanagihara, patent attorney

Claims (1)

[Scope of Claims] (1) A water test tube, a piston for introducing test water into the test water pipe to a predetermined level, a means for forming turbulent flow in the test water introduced into the test water pipe, and the test water pipe. A water quality measuring device comprising: a light source that irradiates light; a light receiving section that is provided corresponding to the light source and measures light over time; and a calculation device that calculates sedimentation velocity distribution based on measurement signals from the light receiving section. (2) The water quality measuring device according to claim 1, in which the means for forming a turbulent flow is a guide vane.The water quality measuring device +3+ q'stone slides along the inner wall of the water test tube, and the patent has a Y-S- function. 1.4) The calculation device calculates the sedimentation velocity distribution from the cumulative passage velocity curve.Claims 1 to 6
Water quality measuring device described in any of the paragraphs