JP4637560B2 - Sewer water quality monitoring device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a sewer water quality monitoring device that can constantly detect and monitor the quality of sewage flowing in a pipe.

  The sewer plays a very important role in maintaining the water quality of public water areas such as rivers and creating a good water environment. However, in order to fully demonstrate its functions, proper maintenance and management of sewerage facilities and drainage regulations that prevent inflow of malicious sewage from factories are necessary. In particular, preventing inflow of malicious sewage is extremely important from the viewpoint of preventing damage to sewerage facilities and treatment inhibition due to harmful substances at sewage treatment plants.

  However, in the past, the quality of the sewage flowing through the sewer pipe has not been measured (detected) on a regular basis. That is, in the past, for example, a sensor was built in a sensor that detects the quality of sewage flowing in the pipe, and after detection, the sensor was pulled up and the detection result stored in the memory was read out. In general, a method of preserving the time drainage and inspecting the quality of the drainage water is generally used, and none of the methods for constantly detecting the water quality has been adopted.

As described above, one of the reasons why the conventional measurement (detection) of water quality has not been conventionally performed, particularly when the sensor water quality detection method is a contact type, and the sensor is always immersed in sewage as a measurement sample. In such a state, a decrease in sensitivity due to contamination cannot be ignored, and therefore there is a problem that high reliability cannot be obtained for data.
By the way, as an automatic cleaning device for a sensor, for example, an electrode cleaning device that automatically and sequentially performs water washing and chemical washing of a pH electrode after pH measurement is provided (for example, see Patent Document 1).
JP-A-60-57246

However, the automatic cleaning device described above is intended to measure the liquid that continuously flows in the measurement tank, and the components other than the sensor do not come into contact with the liquid that is the measurement object, so there is a risk of contamination by the liquid. Absent.
However, when such an automatic cleaning device is applied to a sensor for sewage flowing in the pipe, the water level of the sewage flowing in the pipe often rises due to rain in the sewer. Even if the components are placed higher than the sensor, it is almost impossible for these components to be free from contamination by sewage. If the automatic cleaning device is contaminated with sewage in this way, the device is a precision instrument, and a failure or the like occurs immediately. Further, such an automatic cleaning apparatus has a problem of how to replenish cleaning water and chemicals. Therefore, at present, it is impossible to use the automatic cleaning device for cleaning the sewage sensor.

  The present invention has been made in view of the above circumstances, and prevents the deterioration of sensitivity due to contamination by sewage of the sensor, improves the reliability, and enables the regular monitoring of the sewage water quality, and enables the sewer water quality monitoring. It is an object to provide an apparatus.

The sewer water quality monitoring device of the present invention is a sewer water quality monitoring device that detects and monitors the quality of sewage flowing through the pipe,
A sensor for detecting the quality of sewage that is provided in the tube and flowing in the tube, a head tank provided in the tube or in a human hole, and having an opening on the upper side thereof; And a cleaning unit that supplies the water stored in the head tank to the sensor to clean the sensor.

  According to this sewer water quality monitoring device, since the head tank having an opening on the upper side is provided, for example, when the level of sewage flowing in the pipe rises due to rain and exceeds the upper side of the head tank As the sewage flows into the head tank, water is replenished and stored in the head tank. At the time of rainfall increase due to rainfall, the sewage flowing through the pipe basin is cleaner than the sewage normally flowing, and therefore the water stored in the head tank is cleaner than the sewage at the normal time. Therefore, when the water supplied and stored in this way is supplied to the sensor by the cleaning unit, the sensor is cleaned, and therefore, a decrease in sensitivity due to contamination due to sewage is prevented.

In the sewer water quality monitoring device, the water hole is formed in a human hole lid that covers the opening on the ground side of the human hole, and guide means for guiding rainwater passing through the water hole to the head tank. Is preferably provided.
In this way, even if the amount of rainfall is small and the water level of the sewage flowing through the pipe does not reach the upper side of the head tank, the above-mentioned guiding means can guide the rain water on the surface to the head tank, Therefore, the sensor can be washed with this rainwater.

  According to the present invention, since the sensor is washed by the washing unit as described above, the sensitivity reduction due to the contamination due to the sewage is prevented, so that the reliability of the detection data on the water quality is improved. This makes it possible to constantly monitor the quality of sewage water, thus greatly contributing to the conservation of water quality in public water areas such as rivers and the creation of a good water environment. In addition, since the supply of washing water is mainly provided by rain, the equipment configuration is simplified, so the entire system can be made inexpensive and the burden of work for maintenance and inspection is greatly reduced. Will be.

Hereinafter, the sewer water quality monitoring device of the present invention will be described in detail.
FIG. 1 is a diagram showing an embodiment of a sewer water quality monitoring apparatus according to the present invention. Reference numeral 1 in FIG. 1 denotes a sewer water quality monitoring apparatus (hereinafter referred to as a water quality monitoring apparatus). The water quality monitoring device 1 detects the water quality of the sewage 3 flowing in a pipe 2 provided in the ground. In particular, the water quality of the sewage 3 is steadily transmitted by communicating the detection result to the monitoring base 4. It is intended to be monitored.

  That is, the water quality monitoring device 1 includes a sensor 5 provided in the pipe tub 2 for detecting the water quality of the sewage 3 flowing in the pipe tub 2, and a human hole (manhole) in the pipe tub 2 or in communication therewith. ) A head tank 7 provided in 6 and having an opening on the upper side thereof, and a washing unit 8 for washing the sensor 5 by supplying water stored in the head tank 7 to the sensor 5; Is configured.

  The sensor 5 is not particularly limited, and any sensor 5 that is required as a sewage water quality test can be used. For example, pH, COD (chemical oxygen demand), TOC (total organic carbon), TOD (theoretical oxygen demand), TN (total nitrogen), TP (total phosphorus), turbidity, and more One or more types of water temperature and electrical conductivity are appropriately selected and used based on the location conditions of the place where the water quality monitoring device 1 is installed.

  Here, in the present invention, the inspection method of the sensor 5 is basically a contact type, and therefore, the sensor 5 is disposed on the bottom side and is used in a state of being in constant contact with the sewage 3 to be inspected. . The sensor 5 is preferably fixed in the pipe rod 2 by appropriate fixing means so that the sensor 5 is not washed away by the flow of the sewage 3 or damaged. It is preferable to prevent breakage due to collision of solids by providing a protective net or the like. However, in the present invention, a non-contact type sensor may be used as the sensor 5, and even in that case, the sensitivity of the sensor 5 can be prevented from being lowered by performing cleaning as described later.

  In the present embodiment, the head tank 7 is disposed at a location in the tube 2 just below the human hole 6 and has a box-like shape with the upper side as an opening. A lid body 9 having a large number of openings, such as a wire mesh, a mesh, or a punching metal, is attached to the upper side which is the opening. Under such a configuration, the head tank 7 has the sewage 3 flowing through the pipe 2 as a result of rainfall or the like, as will be described later, and the sewage 3 is transferred to the head tank 7 by exceeding the upper opening of the head tank 7. When flowing into the tank 8, large solids are prevented from entering the head tank 7. Here, it is preferable that the opening diameter of the opening formed in the lid body 9 is in a range of, for example, 1 mm or more and 5 mm or less. By setting it as such a range, while making it easy to enter a sewage into the head tank 7, it can prevent that a big solid substance enters into the head tank 7 as mentioned above.

  The head tank 7 has a through hole (not shown) formed on the bottom surface thereof, and a pipe 10 is connected to the through hole. In addition, a filter (not shown) made of a mesh having a smaller opening diameter than the lid 9 and having a relatively fine mesh is provided in the through hole connecting the pipe 10, thereby solidifying the pipe 10. The minute may be prevented from flowing in. The pipe 10 extends downward from the head tank 7 to the vicinity of the sensor 5, and an electromagnetic valve 11 is disposed in the path.

  The electromagnetic valve 11 is electrically connected to, for example, a battery described later, and is turned on / off. The on / off of the electromagnetic valve 11 is controlled by a timer provided with the battery, or is provided in the head tank 7. In addition, it is configured such that on / off is controlled by a water level gauge or the like. That is, in the case of the timer type, for example, the electromagnetic valve 11 is opened once a day, whereby water stored in the head tank 7 is supplied to the sensor 5 side through the pipe 10. . In the on / off control method using a water level gauge or the like, for example, a float type switch is provided in the head tank 7, and the switch is turned on when water accumulates in the head tank 7 and the float rises to a set position. Thus, the electromagnetic valve 11 is opened and water is supplied to the sensor 5 side through the pipe 10.

  A nozzle 12 is provided on the pipe 10 below the electromagnetic valve 11. The nozzle 12 is disposed in the vicinity of the sensor 5 and directed toward the sensor 5. When the electromagnetic valve 11 is opened and the water stored in the head tank 7 flows down, the water is removed. It injects toward the sensor 5 and cleans the sensor 5. And the washing | cleaning part 8 of this invention is comprised from such piping 10, the solenoid valve 11, and the nozzle 12. FIG. In addition, since the injection pressure of the water injected from the nozzle 12 is determined by the head pressure of the head tank 7, it is preferable that the position of the head tank 7 is at a sufficiently high position with respect to the sensor 5.

The sensor 5 is connected to a cable 13 for transmitting a signal detected with respect to the water quality of the sewage 3. For example, the cable 13 is held on the inner wall surface of the human hole 6, and the side opposite to the sensor 5 is pulled out to a human hole cover (manhole cover) 14 covering the opening on the ground side of the human hole 6. Is.
As shown in FIG. 2, the manhole cover 14 is detachably attached to the opening 6a on the ground side of the manhole 6, and includes a pan-shaped inner lid 14a covering the opening 6a and the inner lid 14a. It has a double structure consisting of an outer lid 14b covering the rim. A space portion 14c is formed between the inner lid 14a and the outer lid 14b, and the space portion 14c serves as a housing portion for housing the communication means 15 as will be described later.

  The inner lid 14 a of the manhole cover 14 is detachably attached to and held by the opening 6 a by being placed with its upper end hooked on the opening 6 a of the manhole 6. A through hole 16 is formed in the bottom of the inner lid 14a, and one end side (the side opposite to the sensor 5) of the cable 13 connected to the sensor 5 passes through the through hole 16 so as to be movable. , Drawn out toward the space 6c. In addition to the through hole 16, the inner lid 14a is formed with a water permeable hole 17 penetrating the inner lid 14a.

  A communication means 15 is connected to the cable 13 in the space 14c. The communication means 15 includes a converter 18 that converts a detection signal from the sensor 5 into a communication signal, an antenna 19 that is connected to the converter 18 and communicates the communication signal to the monitoring base 4, a converter 18, Furthermore, it is configured to include a battery 20 as a power source for the antenna 19, and these are housed in a waterproof case 21 and fixed on the inner lid 14a in that state. Here, various types of antennas 19 can be used without any particular limitation. For example, a vehicle-mounted roof top antenna, a roof side antenna, an on-glass antenna, or the like is preferably used. Also, a mobile phone can be used in place of the antenna 19. The battery 20 also serves as a power source for the electromagnetic valve 11 and timer described above.

  For example, as shown in FIG. 1, a guide tube 22 is connected to the water permeable hole 17. The guide tube 22 hangs down from the inner lid 14a, and its lower end side reaches the upper opening side of the head tank 7, that is, directly above the lid body 9, and is held in the human hole 6 in that state by holding means (not shown). Thus, it functions as a guiding means for guiding the rainwater accumulated on the inner lid 14 during the rain to the head tank 7.

The outer lid 14b of the manhole cover 14 covers the inner lid 14a and is fixed to the opening 6a of the manhole 6 with a clamp (not shown) or the like in that state. A plurality of openings 23 penetrating toward the side are formed. By forming the opening 23 in this manner, rain that has fallen on the outer lid 14b and rainwater that has flowed in from the surrounding area accumulates in the space 14c, that is, on the inner lid 14a, through the outer lid 14b. Further, it is guided into the head tank 7 through the water permeable hole 17 and the guide tube 22. Therefore, the water level of the sewage flowing through the pipe tank 2 rises in the head tank 7 as will be described later, and even if it does not reach the upper opening of the head tank 7, it simply rains and the sensor 5 is washed. The water for it is to be replenished.
In addition, since the opening 23 is formed in this way, the radio wave from the antenna 19 arranged on the lower side (back side) is transmitted through the monitoring base 4 without being attenuated by the outer lid 14b. To be communicated to.

Next, the usage pattern of the water quality monitoring apparatus 1 having such a configuration will be described.
First, at normal times, the water quality of the sewage 3 flowing through the pipe tub 2 is detected by the sensor 5 regularly, for example, at intervals of 10 minutes. Then, the obtained detection value (detection signal) is sent to the converter 18 via the cable 13, where it is converted into a communication signal. The communication signal is sent from the antenna 19 to the monitoring base 4. Therefore, the monitoring base 4 can perform regular monitoring of the water quality of the sewage 3.

  Further, when it rains, it is supplied into the head tank 7 through the water-permeable hole 17 and the guide tube 22 formed in the inner lid 14a. Furthermore, when the amount of rainfall is large and therefore the water level of the sewage 3 flowing in the pipe 2 rises and exceeds the upper opening of the head tank 7, the sewage 3 passes through the opening of the lid 9 and enters the head tank 7. Flow into. At this time, since the opening of the lid 9 is formed in the appropriate diameter as described above, particularly large solid material does not flow into the head tank 7. It is prevented that the piping 10 connected to 7 is clogged.

  In this way, the water supplied into the head tank 7 is usually cleaner than the sewage 3 flowing in the pipe 2. In other words, the rainwater flowing through the water permeable holes 17 is cleaner than the sewage 3 because it contains almost no sludge, and most of the sewage flowing through the pipe tub 2 at the time of rainfall increase due to rainfall is basically the majority. Because it is rainwater, it is still cleaner than the normal sewage.

  Therefore, clean water is automatically replenished and stored in the head tank 7 in such a rainy season as described above, so that the water stored in the head tank 7 is discharged from the nozzle 12 by operating the electromagnetic valve 11. It can be injected and supplied to the sensor 5. And since the sensor 5 can be wash | cleaned by this, the fall of the sensitivity resulting from the stain | pollution | contamination by the sewage 3 can be prevented. When water is not stored in the head tank 7, the water does not flow even if the electromagnetic valve 11 is operated. Therefore, the sensor 5 is not cleaned, but after several days or weeks. When it rains, the sensor 5 is washed again and the sensitivity is maintained normally.

  Further, when performing maintenance and inspection of the antenna 19 and the converter 18, and also when replacing the battery 20, only the outer lid 14b of the manhole cover 14 is removed from the opening 6a of the manhole 6 and placed on the inner lid 14a. The waterproof case 21 is opened for maintenance and inspection. Therefore, it is not necessary for the worker to get down into the human hole 5, and operations such as maintenance and inspection can be performed easily and safely.

  As described above, in the water quality monitoring device 1 according to the present embodiment, the cleaning water is automatically supplied into the head tank 7 by rain or the like, and the sensor 5 is washed using this, so that the sewage 3 Therefore, the reliability of the data can be greatly improved. Therefore, the water quality of the sewage 3 in the pipe 2 can be constantly monitored, and this can greatly contribute to the water quality preservation of public water areas such as rivers and the creation of a good water environment. In addition, since the supply of washing water is mainly provided by rain, the equipment configuration is simplified, so the entire system can be made inexpensive and the workload for maintenance and inspections can be greatly reduced. can do.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the electromagnetic valve 11 is provided in the path of the pipe 10 constituting the cleaning unit 8, and the water in the head tank 7 is supplied to the sensor 5 by the on / off control thereof. In addition, for example, a pump may be provided in place of the electromagnetic valve 11, and the water in the head tank 7 may be supplied to the sensor 5 by the operation of this pump and cleaned. If a pump is used instead of the electromagnetic valve 11 in this way, the water in the head tank 7 can be pumped by the pump, and therefore the pressure of the water sprayed from the nozzle 12 can be increased, thus increasing the cleaning power. be able to.

  Further, although the head tank 7 is disposed in the pipe rod 2, it may be disposed in the human hole 6. By doing so, the head tank 7 is positioned sufficiently high with respect to the sensor 5, The cleaning pressure can be increased by increasing the injection pressure of water sprayed from the nozzle 12. In addition, by arranging the head tank 7 in the human hole 6 in this way, rainwater falling from the water-permeable hole 17 of the inner lid 14a can be directly received by the head tank 7 without passing through the guide tube 22. it can.

  Moreover, in the said embodiment, although the system performed by the radio | wireless via the antenna 19 is employ | adopted as a communication system to the monitoring base 4, For example, when an optical fiber is laid in the tube 2 In this case, a photoelectric converter may be connected to the converter 18 and further connected to the optical fiber via an optical cable so that communication can be made with the monitoring base via the optical fiber.

  Further, in the embodiment, the lid body 9 is attached to the head tank 7, but the head tank 7 may be simply left open. Further, water is replenished into the head tank 7 only when the water level rises due to the water increase in the pipe 2 without forming the water permeable hole 17 in the inner lid 14a (human hole lid 14), and thus without providing a guiding means. You may be made to do.

It is a schematic block diagram of the sewer water quality monitoring apparatus which concerns on embodiment of this invention. It is principal part side sectional drawing of the water quality monitoring apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sewerage water quality monitoring device, 2 ... Pipe pipe, 3 ... Sewage, 4 ... Monitoring base, 5 ... Sensor, 6 ... Human hole, 7 ... Head tank, 8 ... Washing section, 9 ... Lid, 10 ... Piping, 11 ... Solenoid valve, 12 ... Nozzle, 14 ... Human hole lid, 17 ... Water-permeable hole

Claims (2)

A sewer water quality monitoring device that detects and monitors the quality of sewage flowing through a pipe,
A sensor that is provided in the pipe and detects the quality of sewage flowing in the pipe, and is provided in the pipe or in a human hole communicating with the pipe, and has an opening on the upper side thereof. A sewer water quality monitoring apparatus comprising: a head tank comprising: a head tank; and a cleaning unit that supplies the water stored in the head tank to the sensor to clean the sensor. A water-permeable hole is formed in a human-hole cover that covers the opening on the ground side of the human hole, and guide means for guiding rainwater passing through the water-permeable hole to the head tank is provided. 1. Sewer water quality monitoring device according to 1.

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