JPS63232807A - Wastewater treatment equipment for gas stations - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wastewater treatment device installed at a gas station for refueling automobiles and the like.

[Conventional technology]

At such filling stations, alcohol such as methanol may be handled in addition to the gasoline or diesel oil that is conventionally used as fuel for automobiles, and alcohol or alcohol mixed fuel supply equipment is installed as a metering machine, separate from the gasoline refueling machine. may be installed.

On the other hand, in the past, an oil-water separation tank was installed at a corner of the premises of a gas service station to prevent gasoline that leaked from the refueling nozzle onto the ground during refueling of automobiles, etc. from flowing out of the premises. By collecting gasoline, which is a highly flammable and dangerous substance, it is prevented from igniting and causing a fire or other danger.

However, since the alcohol or alcohol mixed fuel supply system will be installed on the same site as the gasoline refueling machine, alcohol spilled onto the ground from the nozzle of the alcohol or alcohol mixed fuel supply system will be treated in the same way as gasoline. Flows into the oil/water separation tank.

This oil-water separation tank was made for gasoline, which is a conventional fuel.For example, baffles are arranged in a staggered manner from the inlet to the outlet alternately from the top and bottom in one tank. The baffle plate takes advantage of the light specific gravity of oil to prevent the oil that has risen to the surface of the water from flowing out of the outlet, separating the oil and water by allowing only the water to flow out.

However, since alcohol dissolves in water, an oil-water separation tank with such a structure does not separate oil and water like water, and water is discharged from the tank while still containing alcohol. Until now, there has been no established means for preventing alcohol from being discharged.

[Problem that the invention seeks to solve]

As a result, if wastewater with a high alcohol concentration is discharged into sewage systems, there is a risk of danger such as alcohol vapor igniting and exploding in the sewage pipes, and of causing pollution such as contaminating sewage water and rivers.

The purpose of the present invention is to solve the disadvantages of the conventional example, to prevent water with a high alcohol concentration from being discharged into the sewer, and to provide a gas service station that can prevent dangers such as explosions in sewer pipes and other pollution. Our objective is to provide wastewater treatment equipment.

[Means for solving problems]

In order to achieve the above object, the gist of the present invention is to provide an alcohol detector in a wastewater treatment tank.

[Function] According to the present invention, when water containing alcohol at a certain concentration or more flows into the wastewater treatment tank, the alcohol detector detects this.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a vertical sectional front view showing an embodiment of the wastewater treatment device for gas service stations of the present invention, and FIG. 2 is an overall perspective view of the gas station in which the wastewater treatment device for gas service stations of the present invention is installed, showing the overall configuration of the gas station. To explain, on an island 3 installed on the ground in a site 2 surrounded by a fire prevention wall 1, there is a gasoline refueling machine 4 that handles high-octane gasoline and regular gasoline as a metering machine for refueling cars etc. An alcohol or alcohol mixed fuel supply device 5 such as the above is installed upright. In the figure, 6 indicates a building such as an office, and 7 indicates a canopy that covers the top of the site 2.

In the gas station having such a configuration, a wastewater treatment device 8 is installed at a corner on the entrance/exit side to the site 2. this.

As shown in Fig. 1, the wastewater treatment device 8 utilizes a conventionally well-known oil-water separation tank as an example, and its upper surface is covered with a plate 9 located at the same level as the ground surface, and the upper sides are placed opposite each other to separate the wastewater. It is a tank 12 provided with an intake port 10 and a discharge port 11 for water separated from oil, and baffle plates 13a, 13b, 13c, 13cL13 are installed from the upper and lower parts of the tank 12.
e are alternately vertically protruded in a staggered manner and in a direction perpendicular to the intake port 10 and the discharge port 11. Then, the intake port 10 is installed near the entrance to the site 2.
14, and the discharge port 11 opens to a sewer or the like.

In the present invention, a water supply pipe 16 having a solenoid valve 15 in the middle as a water supply means is connected to the outlet 11 side of the tank 12 having such a structure, and alcohol detectors 17a and 17b are installed in the air and in the water. did.

The alcohol detector 17a to be installed in the air is one that is conventionally used for drunk driving enforcement, and the alcohol detector 17b to be installed in the water is one that uses light because the specific gravity of methanol is about 0.8. It is conceivable to use a sensor that uses a sensor and a float to measure the intensity in the water.

A control device 18 such as a microcomputer and an alarm 19 are installed in the building 6, etc., and the outputs from the alcohol detectors 17a and 17b are introduced into the control device 18, and the control signal from the control device 18 is transmitted to the water supply pipe 16. It is introduced into the solenoid valve 15 and the alarm 19 provided in the.

The alarm 19 is installed at at least two locations, one inside and one outside the building 6, so that the alarm can be heard anywhere in the gas station.

Next, to explain the operation, when refueling a car with gasoline, methanol, etc. using the gasoline refueling machine 4 or the alcohol or alcohol mixed fuel supply device 5, the gasoline or methanol leaking onto the ground from the tip of the refueling nozzle is Rainwater, car wash water, and other drainage water flow through the site 2 and flow into the ditch 14.

The water then flows through the groove 14 and enters the tank 12 through the intake port 10, where oil such as gasoline floats on top of the water to form oil N20a at the top. This oil layer 20a is blocked by the first baffle plate 13H and does not flow to the discharge port 11 side, but accumulates there, and the oil that does not float up here passes below the first baffle plate 13a. The oil layer 20 rises along the second baffle plate 13b, floats above the water, and forms an oil layer 20 between it and the third baffle plate 13c.
form b. In this way, water from which oil is gradually removed by the baffles 13a to 13e flows toward the outlet 11.

However, in addition to oil, the wastewater flowing in from the intake port 10 also contains alcohol such as methanol, and this alcohol does not float to the top of the water like oil, but dissolves in the water, so the drain port 11 side Water containing alcohol will flow into the tank.

Therefore, the alcohol vapor concentration in the air is detected by the alcohol detector 17a, and the alcohol concentration in the water is detected by the alcohol detector 17b. When the detection signal is output to the control device 1, the control device 18 judges whether the detected concentration is dangerous or not, exceeding a predetermined value. Solenoid valve 15 installed in
and is output to the alarm 19.

As a result, the solenoid valve 15 opens and water is supplied into the tank 12 from the water supply pipe 16, and the alcohol content in the tank 12 is diluted to become water with a low alcohol concentration, which flows out from the outlet 11 into the sewage or river.

In addition, the alarm 19 was activated and alerted people inside the gas station.
It notifies you by light and sound that the alcohol concentration is dangerous beyond a predetermined value.

In addition, although the above-mentioned example was shown as an example in which the oil-water separation tank is applied to a device that performs wastewater treatment of water containing alcohol,
The present invention is not limited to this, and it is also conceivable to install a tank for diluting alcohol, for example, separately from the oil-water separation tank.

〔Effect of the invention〕

As described above, the wastewater treatment device for gas stations of the present invention detects the alcohol content contained in the wastewater from gas stations, dilutes it as necessary, and releases wastewater with a high alcohol concentration into sewage or rivers. Therefore, it is possible to prevent dangerous occurrences such as explosions of sewage pipes, and also prevent pollution of rivers and adverse effects on fish living there.

In addition, it can be used in existing oil-water separation tanks without requiring any particularly large-scale construction work, and can be used at gas stations that handle not only alcohol but also gasoline.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the wastewater treatment device for gas service stations of the present invention, and FIG. 2 is a perspective view of a gas station in which the wastewater treatment device for gas service stations of the present invention is installed. 1...Fire fence 2...Site 3...Island 4...Gasoline refueling machine 5...Alcohol or alcohol mixed fuel supply device 6...Building
7... Canopy 8... Wastewater treatment equipment 9
...Plate 10...Intake port 11...Outlet port 12...
・Tanks 13a, 13b, 13c, 13d, 1
3e-”Baffle plate 14...Groove 15...
・Solenoid valve 16...water supply pipe 17a, 17b・
...Alcohol detector 18...Control device 19
...Alarm 2Qa, 20b - Oil layer

Claims (1)

[Claims] A wastewater treatment device for a gas service station characterized by having an alcohol detector installed in the wastewater treatment tank.