JPH0989874A - Automatic judging apparatus for safety of construction waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly, quickly and automatically judge the safety of waste water of a construction work at low cost. SOLUTION: The apparatus is provided with a water tank 1 where construction waste water is supplied and a fish 4 is bred, a light-emitting part 2 and a light-detecting part 3 of an optical sensor arranged in the water tank. Moreover, the apparatus has an alarming device 8 which alarms when a signal indicating passing of the fish is not detected by the light-detecting part for a predetermined time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of automatically determining the safety of drainage water such as groundwater and cleaning water generated in environmental restoration work and regional development work.

[0002]

2. Description of the Related Art When wastewater such as groundwater or washing water generated in civil engineering and construction sites is discharged into a natural environment such as a river or the sea and discharged, the wastewater has some danger to the environment, for example, toxicity or carcinogenesis. The issue of whether or not there is a gender is a major risk for emission managers. In the case of ordinary water, it is often practiced in sewage treatment plants to raise fish with the water before discharging it to the environment.

[0003]

However, in the case of water with a high risk as described above, the determination of safety is a major issue, and an accurate and rapid determination method is required. In this regard, conventionally, in order to determine the safety of tap water, an apparatus has been proposed in which a fish tank for observing fish is monitored by a television camera and an abnormality of the fish is determined by image analysis by a computer. However, this device requires an amount of money in the order of tens of millions of yen, which is not a level that can be adopted in civil engineering and construction sites.

The present invention is to solve the above problems and provides an automatic drainage safety judging device for construction drainage which can automatically and accurately judge the safety of construction drainage at low cost. With the goal.

[0005]

Therefore, an automatic safety device for construction wastewater according to the present invention is provided with a construction effluent, an aquarium for raising fish inside, and an optical sensor light emitting unit installed in the aquarium. And a light sensor light receiving unit, and an alarm device for issuing an alarm when the fish passage signal detected by the light sensor light receiving unit does not exist for a predetermined time.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a construction wastewater safety automatic determination device of the present invention. The construction wastewater before discharge is pumped into the water tank 1, and a predetermined number of fish 4 is put in the water tank 1. The aquarium 1 is equipped with devices such as an oxygen supplier, a water temperature controller, an automatic feeding device, and a filter for survival of fish.

An optical sensor light emitting section 2 and an optical sensor light receiving section 3 for detecting passage of fish 4 are provided in the water tank 1. The optical sensor light emitting unit 2 and the optical sensor light receiving unit 3 are connected to the amplifier 5, the fish passage signal output device 6, the timer 7, and the alarm device 8. The light sensor receives the light emitted from the light emitting unit 2 by the light receiving unit 3, and when the fish 4 passes and blocks this light, the light receiving unit 3 does not detect the light. To judge. When selecting an optical sensor, it is necessary to use a sensor that has a sensitivity that reacts only with fish and does not react with anything other than fish, such as bubbles, dust, and food.

FIG. 2 is a diagram for explaining the determination method according to the present invention. As shown in FIG. 2A, in the fish passage signal output device 6, an output pulse is obtained every time the fish 4 passes between the optical sensor light emitting unit 2 and the optical sensor light receiving unit 3, and this output pulse is output. As shown in FIG. 2B for each time, the timer 7 is repeatedly reset and is not output to the alarm device 8, but within the set time t1 of the timer 7 (for example, 10 minutes).
If there is no fish passage signal, the timer 7 operates and the alarm device 8 operates.

In the fish passage signal output device 6, since the passage signal output pattern differs depending on the size of the aquarium, the type and number of fish to be raised, the aquarium installation environment, the feeding method, the optical sensor installation position, etc., the timer 7 is set. Before doing this, record the fish passage signal for a few days in advance to understand how it came out.

According to experiments, when about 40 small fish (medaka, neon tetra, etc.) were raised in a 45-liter aquarium,
It was found that the passing signal could be detected several times per minute in the daytime and several times per hour even in the darkness at midnight. Therefore, the set time of the timer 7 may be changed between the daytime when the movement of the fish becomes active and the nighttime when the activity becomes dull.

As is clear from the above description, according to the present invention, the safety of the construction drainage is judged by detecting the fish passage signal by the optical sensor. It can be determined automatically.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a safety drainage automatic determination device for construction wastewater according to the present invention.

FIG. 2 is a diagram for explaining a determination method according to the present invention.

[Explanation of symbols]

1 ... Water tank, 2 ... Optical sensor light emitting part, 3 ... Optical sensor light receiving part,
4 ... fish, 5 ... amplifier 6 ... fish passage signal output device, 7 ... timer, 8 ... alarm device

Claims (1)

[Claims] 1. A water tank to which construction wastewater is supplied and which breeds fish inside, an optical sensor light emitting unit and an optical sensor light receiving unit installed in the water tank, and a fish passage signal detected by the optical sensor light receiving unit. A device for automatically determining the safety of construction drainage, which is provided with an alarm device that issues an alarm when there is no predetermined time.