JP4365258B2 - Drainage pollution concentration detection system, drainage pollution detection device, and drainage pollution detection piping unit - Google Patents

Description

  The present invention relates to a drainage pollution concentration detection system that detects the pollution concentration of drainage discharged from a residence, a drainage pollution detection device that detects the pollution of drainage, and a drainage pollution detection piping unit.

  Conventionally, the manager of a sewage treatment plant calculates a sewerage charge assuming that "the amount of load that wastewater gives to the sewage treatment facility is proportional to the amount of water used by the drainer (residence, factory, etc.)" Charged to wastewater dischargers. In other words, sewerage charges were calculated assuming only the amount of wastewater, regardless of the quality of the wastewater. However, the cost of sewage treatment at a sewage treatment facility greatly depends not only on the amount of wastewater but also on the quality of the wastewater. For this reason, there has been a problem that the amount of load that the wastewater gives to the sewage treatment facility does not match the sewage charge paid by the drainer.

In order to solve this problem, a system has been proposed in which a load amount of wastewater applied to a sewage treatment facility is detected, and a sewage fee corresponding to the load amount is charged to a drainer (for example, Patent Document 1). reference). This kind of sewerage billing system has sewage load detection means for detecting the load of drainage discharged from the drainer in the vicinity of the drainage source (such as the drain pipe of a sink in a residence). . The sewage load detection means includes water quality detection means such as an optical sensor composed of a light-emitting element and a light-receiving element arranged opposite to each other in the cross-sectional direction of the drainage pipe, a general electromagnetic flowmeter, a turbine flowmeter, etc. The flow rate detecting means. The water quality detection means (light sensor) detects the water quality (SS concentration) of the waste water passing between the light emitting element and the light receiving element. The sewage load amount detection means calculates the product of the water quality detection value calculated by the water quality detection means and the flow rate detection value calculated by the flow rate detection means as the drainage load amount. The sewerage charge is calculated according to the load calculated by the sewage load detection means, and the drainer is notified of the charge for the sewage charge.
JP 2002-267657 A

  However, in the water quality detection means (light sensor) of the above-described sewerage billing system, if at least one of the window installed on the light emitting element side of the drain pipe and the window installed on the light receiving element side becomes dirty, The amount of transmitted light received is less than the original amount of light received due to window contamination. For this reason, a water quality detection means will calculate the water quality detection value worse than the actual water quality of waste water. As a result, the sewage load amount detecting means excessively calculates the load amount that the drainage gives to the sewage treatment facility.

  In addition, the water quality detection value calculated by the water quality detection means is based on a decrease in the amount of light emitted from the light emitting element and the temperature change over time even if the water quality of the wastewater passing between the light emitting element and the light receiving element is constant. It fluctuates due to a change in the light receiving sensitivity of the light receiving element. For this reason, the water quality detection means calculates a water quality detection value that does not match the actual water quality of the waste water. Furthermore, if measures such as periodic maintenance of the water quality detection means are carried out in order to reduce these fluctuation factors of the water quality detection value, the management cost of the system will increase.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to reliably detect the pollution concentration (water quality) of wastewater over a long period of time without maintenance.

The drainage pollutant concentration detection system according to claim 1 is a drainage pollutant concentration detection system for detecting the pollutant concentration of drainage flowing in the drainpipe, and is formed in an opening formed by opening a part of the bottom side of the drainpipe. A transparent window portion to be attached, a light emitting portion that irradiates light through the window portion toward a contamination concentration detection position set in the drainage pipe, and an irradiation light from the light emitting portion by an object contained in drainage In order to receive the scattered light through the window portion, a detection light receiving portion disposed toward the contamination concentration detection position, and reflected light of the irradiation light due to dirt on the drain pipe inner surface of the window portion. In order to receive light through the window portion, a reference light receiving portion disposed toward a dirt detection position that is a transmission position of the irradiation light on the inner surface of the drain pipe of the window portion, and a light receiving portion for detection Calculate pollution concentration based on the amount of light received Rutotomoni, and an arithmetic processing unit for the calculated pollutant concentration is corrected based on the light reception amount of the reference light receiving unit, the light emitting unit, the detecting light-receiving unit and the reference detector, the light of the irradiation light The optical axis of the incident light to the detection light receiving unit and the optical axis of the incident light to the reference light receiving unit are arranged on the same plane, and the light emitting unit is an optical axis of the irradiation light Is arranged at a position having an inclination with respect to a longitudinal section along the vertical direction of the drainage pipe .

The waste water pollution concentration detection system according to claim 2 is the waste water pollution concentration detection system according to claim 1, wherein the waste water pollution concentration detection system extends from the detection light receiving portion to the window portion toward the pollution concentration detection position. A light-shielding part for detection is provided .

The wastewater pollution concentration detection system according to claim 3 is the wastewater pollution concentration detection system according to claim 1, wherein the nontransparent cylindrical reference extends from the reference light receiving portion to the window portion toward the stain detection position. The light-shielding part is provided.

The drainage pollution detection apparatus according to claim 4 is a drainage pollution detection apparatus for detecting pollution of drainage flowing in the drainage pipe, and is a housing attached to an opening formed by opening a part of the bottom side of the drainage pipe. A body, a transparent window provided inside the drain pipe of the casing, and light radiated through the window section toward a contamination concentration detection position set in the drain pipe disposed in the casing The pollutant concentration is detected in order to receive the scattered light of the irradiation light from the light emitting unit by the light emitting unit and the object contained in the waste water through the window unit, and to output a light reception signal for detection according to the amount of received light. A detection light-receiving unit disposed in the housing toward the position, and the reflected light of the irradiation light due to dirt on the inner surface of the drain pipe of the window unit is received through the window unit, and the detection light-receiving signal Outputs the reference light reception signal for correcting Because in, and a reference light receiving portion arranged in the housing toward the contamination detection position is a transmission position of the irradiation light in the drainage pipe side surface of the window portion, the light emitting portion, for the detection The light receiving unit and the reference detection unit are located on the same plane with the optical axis of the irradiation light, the optical axis of the incident light on the detection light receiving unit, and the optical axis of the incident light on the reference light receiving unit. The light emitting section is arranged at a position where an optical axis of the irradiation light is inclined with respect to a longitudinal section along a vertical direction of the drain pipe .

The drainage pollution detection apparatus according to claim 5 is the drainage pollution detection apparatus according to claim 4 , wherein the drainage pollution detection apparatus extends from the detection light-receiving part to the window part toward the pollution concentration detection position. A light-shielding portion is provided .

The drainage pollution detection apparatus according to claim 6 is the drainage pollution detection apparatus according to claim 4, and is a non-transparent and cylindrical reference light-shielding that extends from the reference light-receiving part to the window part toward the dirt detection position. It has the part.

The drainage pollution detection pipe unit according to claim 7 includes a pipe part arranged in a state in which an axial direction is along a flow path of drainage, and a drainage pollution detection apparatus that detects pollution of drainage flowing in the pipe part. A drainage pollution detection piping unit provided, wherein the drainage pollution detection device includes a housing attached to an opening formed by opening a part of a bottom side of the piping portion, and the housing Included in drainage, a transparent window provided inside the pipe part, a light emitting part that is arranged in the housing and irradiates light through the window toward the contamination concentration detection position set in the pipe part In order to receive the scattered light of the irradiation light from the light emitting part by the object to be received through the window part and to output a detection light reception signal according to the amount of received light, it is placed in the casing toward the contamination concentration detection position. The light receiving part for detection arranged and the piping of the window part In order to receive the reflected light of the irradiation light due to the dirt on the inner surface through the window, and to output a reference light reception signal for correcting the detection light reception signal according to the amount of received light, A reference light receiving portion disposed in the housing toward a dirt detection position that is a transmission position of the irradiation light on the inner surface of the pipe portion , and the light emitting portion, the detection light receiving portion, and the reference detection portion. Is arranged at a position where the optical axis of the irradiation light, the optical axis of the incident light to the detection light receiving unit, and the optical axis of the incident light to the reference light receiving unit are included in the same plane, the light emitting unit The optical axis of the irradiation light is arranged at a position having an inclination with respect to a longitudinal section along the vertical direction of the pipe portion .

The drainage pollution detection pipe unit according to claim 8 is the drainage pollution detection pipe unit according to claim 7 , wherein the drainage pollution detection device is directed from the detection light-receiving part to the window part toward the pollution concentration detection position. An extending non-transparent and cylindrical light-shielding portion for detection is provided .

The drainage pollution detection pipe unit according to claim 9 is the drainage pollution detection pipe unit according to claim 7, wherein the drainage pollution detection device extends from the reference light receiving part to the window part toward the dirt detection position. An existing non-transparent and cylindrical light shielding part for reference is provided.

In the waste water pollution concentration detection system according to claim 1, the waste water pollution detection device according to claim 4 , and the drainage pollution detection piping unit according to claim 7 , the detection light receiving unit is disposed toward the pollution concentration detection position. It mainly receives the scattered light of the irradiation light from the object passing through the contamination concentration detection position. Therefore, the amount of light received by the detection light-receiving unit (detection light-receiving signal) varies according to the wastewater contamination concentration (water quality) at the contamination concentration detection position. Further, since the reference light receiving unit is disposed toward the dirt detection position, the reference light receiving part mainly receives the reflected light of the irradiation light caused by the dirt on the window part. Therefore, the amount of light received by the reference light receiving portion (reference light receiving signal) varies depending on the degree of contamination of the window portion. For example, the detection light reception signal and the reference light reception signal are supplied to the arithmetic processing unit.

  The arithmetic processing unit obtains the pollutant concentration of the waste water by utilizing the fluctuations in both the light receiving amount of the detecting light receiving unit (detecting light receiving signal) and the light receiving amount of the reference light receiving unit (reference light receiving signal). Regardless of the soiling of the part, the pollution concentration of the wastewater can always be detected correctly. In addition, when the light-receiving sensitivity of the detection light-receiving unit and the reference light-receiving unit change due to a decrease in the light emission amount of the light-emitting unit over time or a change in temperature, the amount of light received by the detection light-receiving unit (detection light-receiving signal) Since the amount of light received by the reference light receiving unit (reference light reception signal) is affected in the same manner, the contamination concentration of the waste water can always be detected correctly regardless of these events. Therefore, it is possible to reliably detect the pollutant concentration of drainage over a long period of time without maintenance.

Further, by forming the opening on the bottom side of the drainage pipe, the pollutant concentration of the drainage can be correctly detected even when the amount of drainage water is small.
Furthermore, since the optical axis of the irradiation light from the light emitting part is inclined with respect to the longitudinal section along the vertical direction of the drainage pipe, irradiation on the water surface of the drainage reaching the detection light receiving part and the reference light receiving part The amount of reflected light can be reduced. For this reason, the detection accuracy of the pollutant concentration of the waste water can be improved.

In the waste water pollution concentration detection system according to claim 2, the waste water pollution detection device according to claim 5, and the waste water pollution detection piping unit according to claim 8, the detection light receiving part is provided from a position other than the pollution density detection position by providing a detection light shielding part. Light going to is blocked. That is, unnecessary incident light to the detection light receiving unit can be shielded. For this reason, the detection accuracy of the pollutant concentration of the waste water can be improved.
In the wastewater pollution concentration detection system according to claim 3, the wastewater pollution detection device according to claim 6, and the drainage pollution detection piping unit according to claim 9, the reference light-receiving part is provided to the reference light-receiving part from outside the dirt detection position. The incoming light is blocked. That is, unnecessary incident light to the reference light receiving unit can be blocked. For this reason, the detection accuracy of the pollutant concentration of the waste water can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention. The drainage pollution concentration detection system 100 is a system for detecting the pollution concentration of drainage flowing through the drainage pipe 10 of a house, and a drainage pollution detection device 12 attached in a state embedded in the drainage pipe 10 and a sewage treatment facility. And an arithmetic processing unit 26 provided in the facility management unit for managing the processing operation. The drain pipe 10 has a circular cross section and is installed horizontally.

  The drainage pollution detection device 12 includes a housing 13, a window portion 14, an LED 16 (Light Emitting Diode), a detection PD 18 (Photo Diode), a detection iris 20 (detection light-shielding portion), and a detection. A reference signal processing unit 21, a reference PD 22 (reference light receiving unit), a reference iris 24 (reference light shielding unit), and a reference signal processing unit 25. The window 14 is formed of, for example, a transparent acrylic resin integrally with the housing 13 of the drainage pollution detection device 12 and is attached to the opening 11 formed by opening the bottom side (lower side of the drawing) of the drainage pipe 10. It has been. The LED 16 irradiates light through the window portion 14 toward the pollution concentration detection position P <b> 1 set in the drain pipe 10.

  The detection PD 18 is arranged with the light receiving surface facing the contamination concentration detection position P1. That is, the detection PD 18 mainly receives the scattered light of the irradiation light from the LED 16 by the object (scattering body) passing through the contamination concentration detection position P1. Further, the detection PD 18 outputs a detection light reception signal S1 that changes according to the amount of received light. The contamination concentration detection position P1 is set to the window 14 side from the center in the drainage pipe 10 in order to correctly detect the contamination concentration of the wastewater even when the amount of wastewater is small.

  The detection iris 20 is formed in a cylindrical shape with a non-transparent member such as a colored acrylic resin, for example, and extends from the detection PD 18 to the window portion 14 toward the contamination concentration detection position P1. For this reason, the light which goes to PD18 for detection from other than pollution density detection position P1 is shielded. The detection signal processing unit 21 amplifies the detection light reception signal S1 (weak electric signal) output from the detection PD 18 and then converts it into light and converts it into a detection light reception signal S1 ′ (optical signal) via an optical fiber cable. To the sewage treatment facility.

  The reference PD 22 is arranged with the light receiving surface facing the dirt detection position P2 that is the transmission position of the irradiation light of the LED 16 on the inner surface of the drain pipe 10 of the window portion 14. That is, the reference PD 22 mainly receives the reflected light of the irradiation light from the LED 16 due to the dirt of the window portion 14 (dirt adhering to the inner surface of the drain pipe 10 of the window portion 14). Further, the reference PD 22 outputs a reference light reception signal S2 that changes according to the amount of received light.

  The reference iris 24 is formed in a cylindrical shape with a non-transparent member such as a colored acrylic resin, for example, and extends from the reference PD 22 to the window portion 14 toward the dirt detection position P2. For this reason, light traveling from the position other than the dirt detection position P2 toward the reference PD 22 is blocked. The reference signal processing unit 25 amplifies the reference light reception signal S2 (weak electrical signal) output from the reference PD 22 and then converts it into light and outputs it as a detection light reception signal S2 ′ (optical signal) via an optical fiber cable. To the sewage treatment facility.

  The arithmetic processing unit 26 receives electrical signals obtained by photoelectrically converting the detection light reception signal S1 'and the reference light reception signal S2' on the sewage treatment facility side. The arithmetic processing unit 26 calculates the contamination concentration based on the electrical signal corresponding to the detection light reception signal S1 ', and corrects the calculated contamination concentration based on the electrical signal corresponding to the reference light reception signal S2'. That is, the arithmetic processing unit 26 calculates the contamination concentration based on the amount of light received by the detection PD 18 and corrects the calculated contamination concentration based on the amount of light received by the reference PD 22. The LED 16, the detection PD 18, and the reference PD 22 are positions where the optical axis of the irradiation light from the LED 16, the optical axis of the incident light to the detection PD 18, and the optical axis of the incident light to the reference PD 24 are included in the same plane. Is arranged. Further, the LED 16 is arranged so as to be inclined so that the optical axis A of the irradiation light forms an angle α with respect to the transverse section F1 of the drain pipe 10.

FIG. 3 shows an outline of a method for setting the angle α. When the angle α is set to be equal to or larger than the critical angle θ, the irradiation light from the LED 16 is totally reflected at the boundary surface between the window portion 14 and the drainage as shown by a broken line arrow in the figure. Therefore, it is necessary to set the angle α to be smaller than the critical angle θ. The critical angle θ is expressed by the following equation (1), where n1 is the refractive index of water (drainage) and n2 is the refractive index of the window material (window portion 14).
θ = sin ⁻¹ (n1 / n2) (1)
If the angle α is set too small, the amount of light radiated from the LED 16 into the drain pipe 10 increases. However, the scattered light from the scatter of the light emitted from the LED 16 and the reflected light due to dirt on the window 14 Interfere with each other, and unnecessary incident light on the detection PD 18 and the reference PD 22 increases. From the above, it is effective to set the angle α to the maximum angle that does not exceed the critical angle θ. Therefore, in the present embodiment in which the window portion 14 is formed of acrylic resin, the angle α is set to approximately 30 °. Further, the detection PD 18 and the reference PD 22 are also arranged at an angle of approximately 30 ° in the adjacent quadrant of the angle α with respect to the transverse section F1 of the drain pipe 10 corresponding to the angle α.

FIG. 4 shows fluctuations in the pollutant concentration acquired by the received light signal and the arithmetic processing unit 26. In FIG. 4A, the vertical axis represents the voltage of the received light signal, and the horizontal axis represents time. In FIG. 4B, the vertical axis represents the wastewater pollution concentration obtained by the arithmetic processing unit 26, and the horizontal axis represents time.
Normally, the dirt on the inner surface of the drain pipe 10 of the window portion 14 increases with time, so the amount of light received by the detection PD 18 and the amount of light received by the reference PD 22 decrease and increase with time, respectively. That is, as indicated by the solid line in FIG. 4A, the voltages of the detection light reception signals S1 and S2 decrease and increase with time, respectively. Since the decrease amount of the detection light reception signal S1 and the increase amount of the reference light reception signal S2 due to the contamination of the window portion 14 are considered to be substantially equal, the arithmetic processing unit 26, for example, detects the detection light reception signal S1 ′ and the reference The sum of the voltages of the electrical signals respectively corresponding to the light reception signal S2 ′ is acquired as the pollution concentration. For this reason, as shown by the solid line in FIG. 4B, the pollution concentration of the waste water is always detected correctly regardless of the contamination of the window portion 14.

  Further, when the light emission amount of the LED 16 decreases with time, the light reception amounts of the detection PD 18 and the reference PD 22 decrease almost equally with time. That is, as indicated by the broken lines in FIG. 4A, the voltages of the detection light reception signals S1 and S2 are almost the same as the time when the light emission amount of the LED 16 is normal (solid line in FIG. 4A). Descent equally. Therefore, as indicated by a broken line in FIG. 4B, the pollution concentration acquired by the arithmetic processing unit 26 decreases from the pollution concentration that should be originally acquired with time (solid line in FIG. 4B). For this reason, for example, the arithmetic processing unit 26 holds in advance the contamination concentration when the light emission amount of the LED 16 is normal, and periodically compares the contamination concentration at the normal time with the acquired contamination concentration, and these The acquired contamination concentration is corrected by adding or subtracting the difference and the acquired contamination concentration. That is, in FIG.4 (b), the pollution density shown with a broken line is correct | amended to the pollution density shown with a continuous line. For this reason, regardless of the decrease in the light emission amount of the LED 16 with the passage of time, the pollutant concentration of the waste water is always detected correctly.

  Further, when the light receiving sensitivities of the detection PD 18 and the reference PD 22 change with the temperature change, the voltages of the detection light reception signals S1 and S2 rise or fall almost equally with the temperature change with respect to the normal temperature. For this reason, the arithmetic processing unit 26 performs the same correction process as when the light emission amount of the LED 16 decreases with the passage of time, so that the light receiving sensitivity of the detection PD 18 and the reference PD 22 changes with temperature. Therefore, the pollutant concentration of waste water is always detected correctly.

  In addition, the facility management unit of the sewage treatment facility holds the contamination concentration of a scatterer having a very small particle size such as milk as a reference value in advance, and the contamination concentration obtained by the arithmetic processing unit 26 for the reference value is stored. Estimate the actual pollution concentration from the ratio. As a result, in the sewage treatment facility, advance preparation of sewage treatment (preparation of conditions for sewage treatment, etc.) is possible, so that the treatment efficiency of the sewage treatment facility is improved.

  As described above, in the first embodiment, the arithmetic processing unit 26 acquires the pollutant concentration of the waste water by using both the received light amount of the detection PD 18 and the received light amount of the reference PD 22. Regardless of this, it is always possible to correctly detect the pollution concentration of waste water. Even when the light emission sensitivity of the detection PD 18 and the reference PD 22 changes due to a decrease in the light emission amount of the LED 16 with the passage of time or a change in temperature, the pollution concentration of the waste water is always set correctly regardless of these events. It can be detected. Therefore, it is possible to reliably detect the pollutant concentration of drainage over a long period of time without maintenance. For this reason, the management cost of a system can be reduced.

  In addition, it is possible to create appropriate treatment conditions for sewage treatment by feeding forward to the sewage treatment facility (facility management department) the state of wastewater from residences, which is a major factor in eutrophication of rivers, lakes, and seas. Thus, the efficiency of the processing operation can be improved, and the power consumption required for aeration can be reduced, which in turn can contribute to energy saving and prevention of global warming. By providing the detection iris 20, unnecessary incident light to the detection PD 18 can be shielded. Further, by providing the reference iris 24, unnecessary incident light to the reference PD 22 can be shielded. For this reason, the detection accuracy of the pollutant concentration of the waste water can be improved.

  FIG. 5 shows a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the element same as the element demonstrated in 1st Embodiment, and detailed description is abbreviate | omitted. The drainage pollution concentration detection system 100a is different from the drainage pollution concentration detection system 100 (FIGS. 1 and 2) of the first embodiment except that the formation position of the opening 11a (that is, the attachment position of the drainage pollution detection device 12) is different. ). The opening 11a is formed at a position where the optical axis A of the irradiation light from the LED 16 is inclined with respect to the longitudinal section F2 along the vertical direction of the drain pipe 10 when the drainage pollution detection device 12 is attached. . For this reason, the amount of reflected light of the irradiation light from the LED 16 on the water surface of the waste water reaching the detection PD 18 and the reference PD 22 is reduced.

  As described above, also in the second embodiment, the same effect as in the first embodiment can be obtained. Furthermore, since the optical axis A of the irradiation light from the LED 16 has an inclination with respect to the longitudinal section F2 along the vertical direction of the drain pipe 10, the LED 16 at the surface of the drain water reaching the detection PD 18 and the reference PD 22 is used. The amount of reflected light of the irradiation light from can be reduced, and the detection accuracy of the wastewater contamination concentration can be further improved.

  FIG. 6 shows a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the element same as the element demonstrated in 1st Embodiment, and detailed description is abbreviate | omitted. The drainage pollution concentration detection system 100b is a drainage pollution concentration detection system 100 according to the first embodiment except that a part of the drainage pipe 10 is constituted by the pipe portion 30 of the drainage pollution detection pipe unit 28 (see FIG. Same as 1). The drainage pollution detection piping unit 28 includes a piping part 30 that constitutes a part of the drainage pipe 10 and a drainage pollution detection device 12 that is attached in a state of being embedded in the piping part 30 (that is, the drainage pipe 10). ing. As described above, also in the third embodiment, the same effect as in the first embodiment can be obtained.

  FIG. 7 shows a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the element same as the element demonstrated in 1st and 3rd embodiment, and detailed description is abbreviate | omitted. Further, in this example, it is known that the filling rate of the drain pipe increases when drainage flows. The drainage pollution concentration detection system 100c is the same as the drainage pollution concentration detection system 100b (FIG. 6) of the third embodiment except that the arrangement form of the drainage pollution detection piping unit 28 is different. The diameter of the drain pipe 10c is sufficiently larger than that of the drainage pollution detection piping unit 28.

  The drainage pollution detection piping unit 28 is waterproofed to prevent the inflow of drainage into the drainage pollution detection device 12, and the axial direction of the piping part 30 is the axial direction of the drainage pipe 10c (that is, drainage Is fixed in the drain pipe 10c in a state along the flow path). As a result, a part of the drainage flowing through the drainage pipe 10c flows into the piping part 30, so that the drainage pollution concentration detection system 100c functions similarly to the drainage pollution concentration detection system 100b of the third embodiment. As described above, also in the fourth embodiment, the same effect as in the first embodiment can be obtained.

  In the first to fourth embodiments, the example in which the arithmetic processing unit 26 is provided in the facility management unit of the sewage treatment facility has been described. The present invention is not limited to such an embodiment. For example, as shown in FIG. 8, in the wastewater pollution concentration detection system 100d, the arithmetic processing unit 26d may be provided in the wastewater pollution detection device 12d. In this example, the arithmetic processing unit 26d acquires the contamination concentration based on electric signals obtained by amplifying the detection light reception signal S1 and the reference light reception signal S2. And the arithmetic processing part 26d carries out electro-optical conversion of the electrical signal which shows pollution concentration, and transmits to a sewage treatment plant | facility via an optical fiber cable as pollution concentration signal S3 (optical signal).

  In 1st-3rd embodiment, the example which applied this invention to the drainage pipe of the residence was described. The present invention is not limited to such an embodiment. For example, the present invention may be applied to a drainage main for collecting drainage from a residence or a factory, or a drainage pipe in a pumping station provided between a wastewater generation source and a sewage treatment facility. In the first to third embodiments, the example in which the openings 11 and 11a are formed by opening the bottom side of the drain pipe 10 has been described. The present invention is not limited to such an embodiment. For example, when it is known that the filling rate of the drainage pipe increases when drainage flows, the side surface of the drainage pipe may be opened to form the opening.

  As mentioned above, although this invention was demonstrated in detail, the above-mentioned embodiment and its modification are only examples of this invention, and this invention is not limited to these. Obviously, modifications can be made without departing from the scope of the present invention.

It is explanatory drawing which shows the 1st Embodiment of this invention. It is explanatory drawing which shows the principal part of the waste water pollution concentration detection system of 1st Embodiment. It is explanatory drawing which shows the outline | summary of the setting method of the angle with respect to the drain pipe cross section of the optical axis of LED irradiation light. It is explanatory drawing which shows the fluctuation | variation of the pollutant density | concentration acquired by a received light signal and a calculation process part. It is explanatory drawing which shows the 2nd Embodiment of this invention. It is explanatory drawing which shows the 3rd Embodiment of this invention. It is explanatory drawing which shows the 4th Embodiment of this invention. It is explanatory drawing which shows the modification of the waste water pollution concentration detection system of 1st Embodiment.

Explanation of symbols

100, 100a, 100b, 100c, 100d Drainage contamination concentration detection system 10, 10c Drainage pipe 11, 11a Opening portion 12, 12d Drainage contamination detection device 13 Case 14 Window portion 16 LED
18 Detection PD
20 Detection Iris 21 Detection Signal Processing Unit 22 Reference PD
24 Reference iris 25 Reference signal processing unit 26, 26d Arithmetic processing unit 28 Drainage contamination detection piping unit 30 Piping unit P1, P1a Contamination concentration detection position P2 Contamination detection position S1 Detection light reception signal S2 Reference light reception signal

Claims (9)

A drainage pollution concentration detection system for detecting the pollution concentration of drainage flowing in a drainpipe,
A transparent window attached to an opening formed by opening a part of the bottom side of the drain pipe;
A light emitting unit that irradiates light through the window toward the contamination concentration detection position set in the drainpipe;
In order to receive the scattered light of the irradiation light from the light emitting part by the object contained in the wastewater through the window part, a light receiving part for detection arranged toward the contamination concentration detection position,
In order to receive the reflected light of the irradiation light due to the dirt on the inner surface of the drain pipe of the window part through the window part, the dirt detection which is the transmission position of the irradiation light on the inner surface of the drain pipe of the window part A light receiving part for reference arranged toward the position;
An arithmetic processing unit that calculates the contamination concentration based on the amount of light received by the light receiving unit for detection and corrects the calculated contamination concentration based on the amount of light received by the light receiving unit for reference ,
The light emitting unit, the detection light receiving unit, and the reference detection unit include an optical axis of the irradiation light, an optical axis of incident light to the detection light receiving unit, and an optical axis of incident light to the reference light receiving unit. Placed in the same plane,
The said light emission part is arrange | positioned in the position where the optical axis of the said irradiation light has an inclination with respect to the longitudinal cross-section in alignment with the perpendicular direction of the said drainage pipe, The wastewater pollution concentration detection system characterized by the above-mentioned. In the waste water pollution concentration detection system according to claim 1,
A drainage pollutant concentration detection system comprising a non-transparent, cylindrical detection light-shielding portion extending from the detection light-receiving portion to the window portion toward the contamination concentration detection position. In the waste water pollution concentration detection system according to claim 1,
A drainage pollutant concentration detection system comprising a non-transparent and cylindrical reference light-shielding portion extending from the reference light-receiving portion to the window portion toward the dirt detection position. A drainage pollution detection device for detecting pollution of drainage flowing in a drain pipe,
A housing attached to an opening formed by opening a part of the bottom side of the drain pipe;
A transparent window provided inside the drain pipe of the housing;
A light emitting unit disposed in the housing and irradiating light through the window toward a contamination concentration detection position set in the drainpipe;
In order to receive the scattered light of the irradiation light from the light emitting part by the object contained in the wastewater through the window part, and output the detection light reception signal according to the amount of received light, toward the contamination concentration detection position, A light receiving part for detection disposed in the housing;
The reflected light of the irradiation light due to the dirt on the inner surface of the drain pipe of the window is received through the window, and a reference light reception signal for correcting the detection light reception signal is output according to the amount of received light. Therefore, a light receiving part for reference disposed in the housing toward a dirt detection position that is a transmission position of the irradiation light on the drain pipe inner surface of the window part,
The light emitting unit, the detection light receiving unit, and the reference detection unit include an optical axis of the irradiation light, an optical axis of incident light to the detection light receiving unit, and an optical axis of incident light to the reference light receiving unit. Placed in the same plane,
The said light emission part is arrange | positioned in the position where the optical axis of the said irradiation light has an inclination with respect to the longitudinal cross-section in alignment with the perpendicular direction of the said drainage pipe, The wastewater pollution detection apparatus characterized by the above-mentioned. In the waste water pollution detection device according to claim 4,
A drainage pollution detection apparatus comprising a non-transparent and cylindrical detection light shielding part extending from the detection light receiving part to the window part toward the pollution concentration detection position. In the waste water pollution detection device according to claim 4,
A drainage pollution detection apparatus comprising a non-transparent and cylindrical reference light-shielding part extending from the reference light-receiving part to the window part toward the dirt detection position. A drainage pollution detection piping unit comprising a piping part arranged in a state in which the axial direction is along the flow path of drainage, and a drainage pollution detection device for detecting pollution of drainage flowing in the piping part,
The drainage pollution detection device is:
A housing attached to an opening formed by opening a part on the bottom side of the piping part;
A transparent window provided inside the piping part of the housing;
A light emitting unit disposed in the housing and irradiating light through the window toward a contamination concentration detection position set in the piping unit;
In order to receive the scattered light of the irradiation light from the light emitting part by the object contained in the wastewater through the window part, and output the detection light reception signal according to the amount of received light, toward the contamination concentration detection position, A light receiving part for detection disposed in the housing;
The reflected light of the irradiation light due to the dirt on the inner surface of the pipe part of the window part is received through the window part, and a reference light reception signal for correcting the detection light reception signal is output according to the amount of received light. For this purpose, the light receiving part for reference disposed in the housing toward the dirt detection position that is the transmission position of the irradiation light on the inner surface of the pipe part of the window part,
The light emitting unit, the detection light receiving unit, and the reference detection unit include an optical axis of the irradiation light, an optical axis of incident light to the detection light receiving unit, and an optical axis of incident light to the reference light receiving unit. Placed in the same plane,
The said light emission part is arrange | positioned in the position which the optical axis of the said irradiation light has incline with respect to the longitudinal cross-section in alignment with the perpendicular direction of the said piping part, The drainage pollution detection piping unit characterized by the above-mentioned. In the drainage pollution detection piping unit according to claim 7,
The waste water pollution detection device includes a non-transparent cylindrical detection light shielding portion extending from the detection light receiving portion to the window portion toward the pollution concentration detection position. Piping unit. In the drainage pollution detection piping unit according to claim 7,
The drainage pollution detection device includes a non-transparent and cylindrical reference light-shielding portion that extends from the reference light receiving portion to the window portion toward the stain detection position. Piping unit.

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