JPS6088351A - Turbidity level detecting apparatus - Google Patents

Abstract

PURPOSE:To eliminate erroneous operation caused by floating substances in a precipitation tank and to enable the detection of the rising speed of a turbidity layer, by arranging two pairs of optical turbidity sensors different in height and horizontal directions in the precipitation layers. CONSTITUTION:Turbidity sensors A, B each consisting of a light emitter 1 and a light receiver 2 at a position different in height and horizontal directions within the precipitation layer in a precipitation tank 10. Because the height of the arrangement is different, the rising speed of a turbidity level is known from a time required in the arrival of a torbidity layer to upper sensors B from the detection of the boundary layer of a turbidity layer and a clear layer by the lower sensors. In addition, because two turbidity sensors A, B different in height and horizontal directions are not simultaneously blocked from light by floating substances in the precipitation tank, erroneous operation caused by floating substances can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, water treatment of wastewater from the food industry, where insufficient treated water is discharged into sewers or rivers. The present invention relates to a monitoring and control device such as the above, and more particularly to a pollution level detection device for detecting whether or not the treated water has reached a level suitable for discharge.

[Prior art and its problems]

In the sedimentation tank, which is the final process of 1-no-1 water treatment equipment, the boundary between the clear layer and the polluted layer of the treated water is continuously monitored to prevent an increase in 1filN5 of pollution caused by inactivity of the treatment. It is necessary to detect each time the level exceeds the set level and automatically shut off the discharge, and at the same time issue N('14 and 2 to prompt activation of processing and other measures.

Various methods can be used to detect the boundary between the quenching layer and the polluted layer or the degree of pollution in treated water, such as the optical method, ultrasonic method, and electrical conductivity method, but the optical method is the most practical and economical method. It is considered appropriate from this perspective.

Actually, even though the treated water is in a clear layer, it has some coloring and turbidity, so the first thing to consider is whether it is a clear layer that can be discharged, and the attenuation of light between the clear layer and the polluted layer. The question is whether there is a difference that can be clearly distinguished in terms of degree, and furthermore, '/l'i? Unresolved issues include the state of the area near the boundary between the n+= and dirty @ layers.

In addition, when using a single optical pollution sensor, l! I-There is a risk of light being blocked by floating sphagnum moss, etc., which may cause malfunctions, and it is difficult to respond to measures such as activation because parameters such as the rising speed of dirt filfi are unknown. There were problems such as:

[Purpose of the invention]

The object of the present invention is to solve such conventional problems, eliminate malfunctions caused by sphagnum moss, etc. floating in the sinking tank, and provide a device that can also detect the soil velocity of the turbid layer. The purpose is to

[Structure of the invention]

The pollution level detection device of the present invention is characterized in that it includes at least two pairs of optical pollution sensors that are different in height and horizontal direction within the sediment layer.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

FIG. 1 shows the configuration of a pollution sensor according to the present invention, where +11 is a light projector and (2) is a light receiver. If these emitters and receivers are directly submerged in the water in the sedimentation tank, there will be problems such as waterproofing, fogging of the glass due to condensation, and corrosion of gold 11L. We decided not to put (1) and the receiver (2) into the water, but to guide the light into the water using optical fibers (31, +41) and take it out.In this case, the light emitting/receiving gap is 60 to 1) 30
■ Stable characteristics have been demonstrated in horses. In addition, a floodlight (1
) is used as a light source of a far-infrared light emitting diode, and the light from the floodlight (1) is modulated at a constant frequency to almost eliminate the shadow of sunlight Made it possible to ignore it.

FIG. 2 shows the configuration of the turbidity level detection device according to the present invention, in which a pair of pollution sensors A and +3 consisting of a light emitter (11) and a light receiver (2) are arranged in height and horizontal position relative to each other. The iW was installed in the settling tank 00) differently.

In the figure (II) is a microcomputer-7ll' 2b
(12) is the CPU, (+3) is the keyboard, (1
4) I, t c ■<'+゛Display, (15
) is a relay output generator that outputs control commands to the wastewater treatment control panel.

In this device? The results of arranging the Q turbidity sensors Δ and B at different heights and horizontal positions are as follows.

■ Two pairs of turbidity sensors with different heights make it possible to
's level goes down by 1/'s? ``In the case of pattern A, the displacement speed of the boundary layer between the polluted layer and the soaked a layer can be calculated.

Therefore, if the rising speed of the dirty bell is known from the time it takes for the lower sensor Δ to detect the boundary layer and ζ to reach the L position sensor ■3, the activation, etc. The procedure becomes much easier.

■By arranging the height and horizontal position differently, 1
In the case of a pattern in which the pollution of the wastewater in the sedimentation tank 15' changes uniformly, the sphagnum moss floating in the sedimentation tank will not simultaneously block the gap between the two pollution sensors.

[Results of invention]

As described above, according to the present invention, malfunctions caused by sphagnum moss etc. floating in the sedimentation tank can be eliminated, and the rising speed of the polluted layer can also be detected.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a pollution sensor used in the present invention, and FIG. 2 is a block diagram showing the configuration of the device of the present invention. A, B: lr; turbidity sensor (1) bifurcated light device (2): light receiver +31. (41: Optical fiber 00); Sedimentation tank (11): Microcomputer (12): CPU (13): Keyboard (14): CRT display (15): Relay output generator Patent applicant Computer Dekuyuka Co., Ltd. Agent Man
Handmade profit (2 idiots) ``King Wa 1t Neli Seiko: 1987 December 71, 1987 Patent layer No. 196771 2, Name of invention Pollution level detection device 3, Person making correction Relationship to the case Patent applicant address Name Computer Technica Co., Ltd. 4, Agent 5, Date of amendment order -1 Drawing /? Book I (no changes in content)

Claims (1)

[Claims] 1. A contamination level detection device comprising at least two pairs of optical contamination sensors that are different in height and horizontal direction within the sink d'&Ifi.