JP2011191101A - Water monitoring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce frequency of cleaning a monitor water tank in a water monitoring apparatus using fishes. <P>SOLUTION: Water passing holes 7a are provided to a partition wall 7 for partitioning the water introducing tank 3 and swimming tank 4 of the monitor water tank 1, the bottom of the swimming tank 4 and the upper part of the water introducing tank 3 are connected through a precipitation tank 9 by return piping 10 and an air lift pump 11 for blowing air in the return piping 10 to send inspected water to the upper part of the water introducing tank 3 from the bottom of the swimming tank 4 is provided to allow the inspected water in the water introducing tank 3 to flow into the swimming tank 4 through the water passing holes 7a of the partition wall 7 by the water level difference between the water introducing tank 3 and the swimming tank 4 to thereby produce water streams in the swimming tank 4. In this constitution, the air lift pump 11 having the trouble of not getting out of order by the effect of the turbidity component of the inspected water is used as a device for producing water streams in the swimming tank 4, thereby reducing the frequency of cleaning the monitor water tank 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water quality monitoring device that monitors the quality of test water introduced into a monitoring water tank by observing the behavior of fish swimming in the monitoring water tank.

  In purification facilities that purify raw water taken from rivers and supply it to waterworks, etc., a water quality monitoring device that enables early detection of abnormalities in the quality of raw water due to contamination with toxic substances, etc., to ensure the safety of purified water Often installed. One of these water quality monitoring devices is a type of monitoring the quality of the test water by introducing a portion of the collected raw water into the monitoring tank as the test water and observing the behavior of fish swimming in the monitoring water tank. There are some (for example, refer to Patent Document 1).

  An example of a water quality monitoring device of the type using the above fish is shown in FIGS. This water quality monitoring device uses a medaka having a habit of swimming toward a water stream as a fish to swim in the monitoring water tank 51, and observes the behavior of the medaka with a monitoring camera 52 installed above the monitoring water tank 51. The monitoring water tank 51 is composed of a water tank 53 into which test water is introduced, a pump tank 55 in which a submerged pump 54 is installed and receiving water to be discharged from the water tank 53, and a swimming tank 56 for swimming medaka. The partition wall 57 that partitions the pump tank 55 and the swimming tank 56 is provided with a discharge port 57a of the submersible pump 54 and a large number of water holes 57b so that a water flow suitable for observing the action of the medaka is generated in the swimming tank 56. ing. Further, a drain outlet 56a is provided on the bottom surface of the swimming tank 56, and the overflowed water is discharged from the middle of the upper part of the drain pipe 58 connected to the drain outlet 56a.

  However, in this water quality monitoring device, turbid components such as fish excrement and residual food contained in the test water returning from the swimming tank 56 through the water passage hole 57b of the partition wall 57 to the pump tank 55 are contained in the submersible pump 54. As a result, the submersible pump 54 is likely to fail and become unusable. In addition, since turbid components in the test water are easily accumulated in the drain pipe 58, the drain pipe 58 may be clogged. For this reason, it is necessary to clean the pump tank 55 and the swimming tank 56 frequently, and there exists a problem that the cost concerning the maintenance of an apparatus is high.

JP 2008-134119 A

  This invention makes it a subject to reduce the cleaning frequency of the monitoring tank of the water quality monitoring apparatus using fish.

  In order to solve the above problems, the present invention provides a water quality monitoring apparatus for monitoring the quality of test water introduced into the monitoring tank by observing the behavior of fish swimming in the monitoring tank. The partition wall is divided into a water tank into which the test water is introduced and a swimming tank in which the fish is allowed to swim, and a water passage hole is provided in the partition wall for communicating the water tank and the swimming tank. And an upper part of the water tank are connected by a return pipe, and an air lift pump is provided to send air from the bottom of the swimming tank to the upper part of the water tank by blowing air into the return pipe. The test water in the water tank flows into the swimming tank through the water passage hole of the partition wall.

  In other words, the monitoring tank is divided into an inlet tank and a swimming tank by a partition wall, and water is sent from the bottom of the swimming tank to the upper part of the inlet tank by an air lift pump, and the water level is detected from the inlet tank to the swimming tank. Water was spouted to create a water flow suitable for fish observation in the swimming tank. In this configuration, as a means for generating a water flow in the swimming tank, an air lift pump that is not likely to break down due to the influence of turbid components in the test water is used, so compared to the case where an underwater pump is installed in the monitoring tank. The frequency of cleaning the monitoring tank can be reduced.

  Moreover, in said structure, it is desirable to provide the sedimentation tank which precipitates the turbid component in the said test water between the bottom part of the said swimming tank and the edge part of the suction side of the said return piping. In this way, turbid components in the test water can be efficiently removed and the return pipe is not easily clogged, so that the frequency of cleaning the monitoring water tank can be further reduced.

  Furthermore, if the flow of the test water is restricted between the swimming tank and the settling tank, the flow of the test water is slowed down in the settling tank and the turbid component tends to settle, so the turbid component can be more efficiently collected. Can be removed.

  As described above, the water quality monitoring device of the present invention generates a water flow in the swimming tank using an air lift pump that is not likely to break down due to the influence of turbid components in the test water. As in the case, it is not necessary to clean the monitoring tank frequently, and the cost for maintenance can be reduced.

External perspective view of the water quality monitoring device of the embodiment 1 is a longitudinal sectional view of FIG. External perspective view of a conventional water quality monitoring device 2 is a longitudinal sectional view

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, this water quality monitoring apparatus observes the behavior of fish (here, medaka fish) in the monitoring tank 1 with the monitoring camera 2 installed above the monitoring tank 1 as in the above-described conventional apparatus. Thus, the quality of the test water in the monitoring water tank 1 is monitored. The actual water quality is determined by processing and analyzing a medaka image captured by the monitoring camera 2 in an image processing apparatus (not shown) electrically connected to the monitoring camera 2. Moreover, although the fish swimming in the monitoring water tank 1 is not restricted to a medaka, what has the habit of swimming toward a water flow is preferable.

  As shown in FIGS. 1 and 2, the monitoring water tank 1 receives a water tank 3 into which test water is continuously introduced, a swimming tank 4 for swimming medaka, and a water sample overflowing from the swimming tank 4. It consists of a drain tank 6 that discharges to the drain pipe 5. The water tank 3, the swimming tank 4, and the drain tank 6 are separated from each other by partition walls 7 and 8. The partition wall 7 that partitions the swim tank 4 from the water tank 3 and the drain tank 6 has a bottom side on one side. The water tank 7 and the swimming tank 4 are provided with a large number of water holes 7a, and three slits 7b for overflowing the test water from the swimming tank 4 are provided at the center of the other side in the height direction. Yes. The water passage holes 7a and the slits 7b of the partition wall 7 are formed in a size that does not allow the medaka to pass through.

  The swimming tank 4 and the water tank 3 are connected by a return pipe 10 via a sedimentation tank 9 provided on the bottom side of the swimming tank 4. The settling tank 9 communicates with the swim tank 4 through an outlet 4 a provided at the center of the bottom surface of the swim tank 4, and the return pipe 10 has a substantially L-shape from the side wall of the settling tank 9 to the upper part of the water tank 3. It is arranged. Further, in the middle of the return pipe 10, an air lift pump 11 is provided that blows air upward from the lower end of the upright portion and feeds the test water in the return pipe 10 to the upper part of the water tank 3. Thereby, the test water is sent from the bottom of the swimming tank 4 to the upper part of the water tank 3, and the water level of the water tank 3 is kept higher than the water level of the swimming tank 4. Then, due to the difference in the water level between the water tank 3 and the swimming tank 4, the test water in the water tank 3 flows into the swimming tank 4 through the water hole 7 a of the partition wall 7 and enters the swimming tank 4 along its peripheral wall. Water flow suitable for observing the behavior of the water is generated. In addition, the outflow port 4a of the swimming tank 4 is provided with a net-like body so that medaka cannot pass.

  The sedimentation tank 9 precipitates turbid components contained in the test water until the test water flowing from the outlet 4a of the swimming tank 4 reaches the end of the return pipe 10 on the suction side. Here, since the flow of the sample water is restricted at the outlet 4a of the swimming tank 4 (between the swimming tank 4 and the settling tank 9), the turbid components collected in the vicinity of the outlet 4a of the swimming tank 4 have a large flow rate. While being sucked into the outlet 4a, the flow rate of the sample water is slowed in the sedimentation tank 9, and turbid components are easily precipitated.

  A sediment discharge pipe 12 is connected to the bottom surface of the sedimentation tank 9, and a valve 13 that is normally closed is provided in the middle of the discharge pipe 12. Therefore, the turbid component precipitated at the bottom of the settling tank 9 can be discharged from the settling tank 9 together with a small amount of test water simply by opening the valve 13.

  This water quality monitoring device has the above-described configuration, and the air lift pump 11 used as a means for generating a water flow in the swimming tank 4 is not in direct contact with the test water and may be damaged due to the influence of turbid components in the test water. Therefore, it is not necessary to clean the monitoring water tank 1 as often as when a submersible pump is used.

  In addition, a sedimentation tank 9 is provided between the bottom of the swimming tank 4 and the end of the return pipe 10 on the suction side, and the test water flow is narrowed between the swimming tank 4 and the sedimentation tank 9. The sedimentation tank 9 facilitates sedimentation of the turbid components contained therein, and the sedimented turbid components are discharged from the bottom of the sedimentation tank 9, so that the turbidity components in the test water can be efficiently removed to return the pipe 10 This also makes it possible to reduce the frequency of cleaning the monitoring water tank 1 as compared with the conventional case.

DESCRIPTION OF SYMBOLS 1 Surveillance tank 2 Surveillance camera 3 Inlet tank 4 Swimming tank 4a Outlet 5 Drain pipe 6 Drain tank 7, 8 Partition wall 7a Water flow hole 7b Slit 9 Settling tank 10 Return pipe 11 Air lift pump 12 Sediment discharge pipe 13 Valve

Claims (3)

  In the water quality monitoring device for monitoring the quality of the test water introduced into the monitoring water tank by observing the behavior of fish swimming in the monitoring water tank, the monitoring water tank is an inlet tank into which the test water is introduced by a partition wall; Partitioning into a swimming tank for swimming the fish, and providing a water passage for communicating the water tank and the swimming tank in the partition wall, connecting the bottom of the swimming tank and the upper part of the water tank with a return pipe, An air lift pump is provided that blows air into the return pipe to send the test water from the bottom of the swimming tank to the upper part of the water tank, and the water in the water tank is changed by the water level difference between the water tank and the swimming tank. A water quality monitoring device characterized by flowing into a swimming tank through the water.   The water quality monitoring apparatus according to claim 1, wherein a sedimentation tank is provided between the bottom of the swimming tank and an end on the suction side of the return pipe to precipitate turbid components in the test water.   The water quality monitoring device according to claim 2, wherein the flow of test water is narrowed between the swimming tank and the sedimentation tank.

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