JPH1144618A - Device for sampling oil in waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil sampling means which can stably sample in oil in waste water of a drain culvert. SOLUTION: An oil recovery frame 1 with a float which has a waste water introducing sloped plate 3 for suppressing and straightening the flow speed energy of the waste water 12 and a guide plate 4 for gathering the waste water 12 flowing in through the plate 3 to one place at a waste water inflow part 12 and has an oil monitor sensor part 6 at the tip part of the guide plate 4 is so anchored in the waste water culvert 11 as to follow up an increase and a decrease in the flow rate of the waste water 12. Then the oil in the waste water which is introduced into the oil recovery frame 11 by the plate 3 and gathered by the guide plate 4 is detected by the oil monitor sensor 6 and then the oil in the oil recovery plate 1 is recovered by a pump 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the sampling of oil which is carried out in order to monitor oil contained in wastewater discharged to rivers, seas, etc., in wastewater treatment of production process water required for industrial production. Related to the device.

[0002]

2. Description of the Related Art In the steel industry, so-called production process water such as direct cooling water used for cooling steel materials, indirect cooling water used for operating equipment or machines, and protecting equipment for suppressing temperature rise of lubricating oil and the like. Is essential.
For such production process water, the direct cooling water is appropriately treated in a water treatment facility, and the indirect cooling water is cooled to a certain temperature via a cooling tower, etc. Has been discharged to

FIG. 6 shows a typical discharge system of industrial wastewater. Production process water discharged from each of the factories A to C uses inspection manholes 1 installed in each system to prevent oil from flowing out. The oil monitoring sensor detects the presence or absence of oil, and if oil is contained, it is removed or added with a neutralizer, etc., according to the oil content and collected in one place, and the final inspection manhole After checking in 2, it is released to sea areas.

[0004] In the case of such a discharge system, it is most desirable to strengthen daily drainage management at the inspection manhole 1 provided as much as possible on the upstream side in order to detect oil spills early and to respond quickly. However, with the introduction of factory automation (FA), it is difficult to enhance the monitoring of the inspection manhole 1 by workers. In practice, continuous monitoring by the detection sensor and daily inspection at the final inspection manhole 2 are difficult. It corresponds.

[0005] Since oil spills have a great adverse effect on the environment and daily life, early detection and early response at the upstream side such as the inspection manhole 1 as described above are indispensable in order to prevent such spills. The oil is mixed between the existing drainage systems, and there is a problem that the method of detecting with a sensor from above the drainage flow does not sufficiently detect the oil component.

Therefore, instead of a method of detecting with a sensor from above the flow of the wastewater, a method of directly sampling and detecting the oil component in the wastewater has been attempted, and various sampling devices used for the method have been proposed. For example, Japanese Utility Model Application Laid-Open No. 63-152698 proposes a device in which a floating body is connected to a pump, and a pump suction port is positioned at a liquid level to recover bath surface floating oil and the like. However, with the oil sampling method using such a device, it is not possible to sample in the width direction for a large drainage culvert due to the problem of pumping capacity, and it is difficult to collect oil when there is ripples. However, it is difficult to apply it to oil recovery in an industrial wastewater discharge system. Japanese Utility Model Application Laid-Open No. 2-143395 proposes an oil recovery floating frame in which a skirt made of an oil-resistant material is provided on the outer periphery of a lower end portion of a floating frame main body. However, the sampling method using the oil recovery floating frame has a drawback that a wave is generated due to the collision of the drainage water and cannot be rectified in the floating frame, so that stable sampling cannot be performed.

[0007]

In order to accurately sample oil in drainage in a drainage culvert, it is necessary to be able to cope with wavy conditions due to the presence of a flow and the width of a large drainage culvert. The direction must also be covered. However, the conventional sampling means described above does not take into account the fact that it is a large drainage culvert and the condition that it is always wavy due to the presence of a flow. It is impossible to sample oil in wastewater stably.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and in addition to the condition that the flow is always wavy due to the presence of the flow, the drainage follows the fluctuation of the amount of drainage. It is an object of the present invention to provide a drainage oil sampling device capable of accurately sampling oil in drainage in a culvert.

[0009]

According to the present invention, there is provided an apparatus for sampling oil in drainage, comprising: an upper surface having a floating body attached to a bottom portion; An introduction inclined plate is attached, and inside the recovery frame, a pair of left and right guide plates for collecting the drainage introduced from the inclined plate at a substantially central portion of the recovery frame are provided above both ends of the drainage inflow side of the recovery frame. The oil level is monitored at a predetermined distance from the water surface on the upper part of a gate-shaped pedestal which is horizontally projected substantially to the center of the recovery frame, flush with the opening surface, and is integrally attached to the tip of the guide plate. A sensor is installed, and the oil recovery frame is moored to the drain culvert inner wall with a rope or the like so that it can float and swing in drainage,
After detecting the oil in the drainage introduced into the oil recovery frame by the drainage introduction inclined plate and collected at the center of the recovery frame by the guide plate by the oil monitoring sensor, the downstream side of the portal frame is detected. In this configuration, the oil in the oil recovery frame is collected by a pump.

In the present invention, the oil recovery frame has a structure in which one side wall of a rectangular bottomed box is removed, and the side without the side wall is disposed downstream (drainage side). The width is slightly smaller than the width of the drainage culvert. The drainage introduction inclined plate provided at the drainage inflow portion of the oil recovery frame is provided for suppressing and rectifying the flow velocity energy of the drainage, and the length and inclination angle of the inclined plate are determined by the drainage flow velocity. Investigation of the relationship between the rectification effect of the length of the inclined plate and the inclination angle of the inclined plate shows that the flow velocity is generally considered as a design criterion of 1 to 3.5 m / s.
Are preferably 100 to 200 cm and 25 to 30 degrees, respectively.

Further, a guide plate is provided on the drainage inflow side of the oil recovery frame so that the wastewater introduced from the inclined plate is collected at a substantially central portion of the oil recovery frame. This is for suppressing undulation of the introduced wastewater in the recovery frame to make it more rectified. Therefore, the oil mixed into the wastewater due to the turbulent flow naturally floats in the region surrounded by the guide plate, and the oil content can be detected more accurately by the oil content monitoring sensor.

An oil monitoring sensor continuously measures the intensity of reflected light using a laser beam or the like to detect an oil film formed by oil, and is generally known as an oil film detector. According to the present invention, when an oil component is detected by the oil component monitoring sensor, the signal is output and the oil recovery pump is configured to operate.

Further, the oil recovery frame is floated in the drainage by a floating body attached to the bottom thereof, and is moored to the inner wall of the drainage culvert by a rope or the like because the flow rate of the drainage flowing in the drainage culvert varies (increases or decreases).
Is to follow.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing one example of an apparatus for sampling oil in drainage according to the present invention, FIG. 2 is a plan view of the apparatus for sampling oil, and FIG. 3 is a rear view of the apparatus for sampling oil. FIG. 4 illustrates the position of the oil sampling device according to the increase or decrease of the amount of drainage in the drainage culvert. FIG. 4A shows the position of the oil sampling device when the amount of drainage is small, and FIG. Is a schematic diagram showing the position of each, 1 is an oil recovery frame,
2 is a floating body, 3 is an inclined plate for drainage introduction, 4 is a guide plate, 5
, A portal monitor, 6 an oil monitoring sensor, 7 an oil recovery pipe, 8 an oil recovery pump, 9 an oil recovery tank, 10 a mooring rope, 11 a drainage culvert, and 12 a drain. Here, a case where the present invention is applied to a drainage culvert having a rectangular cross section will be described as an example.

The oil recovery frame 1 has a structure in which a side wall of one side of a rectangular bottomed box having an opening is removed as shown in FIG. Is located downstream (drain side).
The width thereof is slightly smaller than the width of the drainage culvert 11, and a floating body 2 for floating the oil recovery frame 1 on the drainage surface is attached to the bottom. This oil recovery frame 1
Is moored to the inner wall of the drainage culvert 11 via a mooring rope 10 so as to be able to follow the flow rate fluctuation (increase / decrease) of the drainage 12 flowing in the drainage culvert 11.

The drainage inclined plate 3 is provided for suppressing the flow velocity energy of the drainage 12 and introducing it into the oil recovery frame 1, and is provided at the upper edge of the side wall of the oil recovery frame 1 on the drainage inflow side. The upper part is attached to the inclination angle. As a result of examining the relationship between the drainage flow rate and the rectification effect of the length L and the inclination angle θ of the inclined plate, the length L and the inclination angle θ of the inclined plate were determined at the flow rates of 1 to 3.5 m / as described above. 100-200 cm, 25-30 degrees are preferred.
If the length L of the inclined plate is less than 100 cm, the drainage 12
The effect of suppressing the flow velocity energy is not sufficiently obtained.
Even if the length exceeds 200 cm, the effect of suppressing the flow velocity energy does not change so much.
~ 200 cm is preferred. The length L and the inclination angle θ of the inclined plate may be set in an appropriate combination according to the installation location, the flow rate and the flow rate of drainage, and the like.

As described above, the guide plate 4 is provided with the drainage 12 introduced into the oil recovery frame 1 through the drainage introduction inclined plate 3.
Is provided in order to suppress ripples in the oil recovery frame 1 and to make the flow more rectified by collecting water substantially in the center of the recovery frame. It is composed of two flat plates protruding horizontally and substantially flush with the opening surface toward the substantially central portion. The width (height) of the pair of left and right guide plates (flat plates) 4 is not particularly limited, but is preferably about の of the depth of the oil recovery frame 1. That is, it suffices if a height equivalent to the thickness of the supernatant layer of the drainage 12 can be secured.

Gate-type gantry 5 on which oil monitoring sensor 6 is installed
The oil monitoring sensor 6 is mounted integrally on the base plate 5-1 which is integrally mounted between the distal end portions of the guide plate 4 and is provided on the upper side inside.
Is installed, and it is rectified by the guide plate 4 and
The oil component that floats on the upper surface of the drainage 12 passing below the oil sensor 12 can be detected by the oil component monitoring sensor 6. As described above, the oil monitoring sensor 6 is generally known as an oil film detector, and continuously measures the intensity of reflected light using a laser beam or the like to detect an oil film formed by oil. Is what you do. The drainage 12 that has passed through the portal gantry 5 merges with the drainage flowing through the drainage culvert 11 as it is.

An oil recovery pipe 7 for recovering the oil floating on the upper surface of the drainage is provided downstream of the portal gantry 5.
And an oil recovery pump 8 are installed. When oil is detected by the oil monitoring sensor 6, a signal is output,
The oil recovery pump 8 is operated to recover the oil floating on the upper surface of the drainage into the oil recovery tank 9. The oil recovery pipe 7 is fixed to the oil recovery frame 1, and a part or all of the oil recovery pipe 7 is formed of a flexible tube (not shown) or the like so as to be able to follow a change in the flow rate of drainage flowing through the drainage culvert 11.

In the oil sampling apparatus having the above-described structure, the drainage 12 flowing in the drainage culvert 11 at a certain flow rate and in a turbulent state flows into the drainage inflow portion of the oil recovery frame 1 floating in the drainage 12 by the floating body 2. The flow rate energy is suppressed by the provided inclined plate for drainage introduction 3 and is introduced into the oil recovery frame 1. The drainage 12 introduced into the oil recovery frame 1 is
By the action of the pair of left and right guide plates 4, the ripples are further suppressed, the flow is rectified, and water is collected substantially at the center of the recovery frame, and the oil content is detected by the oil content monitoring sensor 6 installed on the portal frame 5. Will be When oil is detected by the oil monitoring sensor 6, the detection signal is output, the oil recovery pump 8 is operated, and the oil is recovered through the oil recovery pipe 7. The drainage 12 from which the oil is recovered flows out from the outflow portion of the oil recovery frame 1, merges with the drainage flowing through the drainage culvert 11 again, and flows downstream. On the other hand, since the entire area under the guide plate 4 is open, turbulence due to the merge of the drainage in the oil recovery frame 1 hardly occurs.

As shown in FIG. 4, the operation of the oil sampling device according to the increase or decrease in the amount of drainage in the drainage culvert 11 is as shown in FIG. 4A when the amount of drainage in the drainage culvert 11 is small, and when the amount of drainage is large (B). ). That is, since the oil sampling device can follow the fluctuation (increase / decrease) in the flow rate of the drainage 12 flowing in the drainage culvert 11, even if the flow rate of the drainage 12 fluctuates, the oil content detection and the oil recovery can be accurately performed. .

[0022]

【Example】

Example 1 Using a test facility, the drainage flow rate and the length L and angle θ of the inclined plate were variously changed, and the results of examining the rectification rate of drainage are shown in Table 1.
Shown in The flow velocity used was a range generally considered as a design standard (1 to 3.5 m / s). The rectification rate was calculated by the following equation 1. From the results shown in Table 1, it is understood that the length L is preferably 100 cm or more, and the inclination angle θ is preferably in the range of 25 to 30 degrees.

[0023]

(Equation 1)

[0024]

[Table 1]

Embodiment 2 The apparatus of the present invention is installed in a drainage culvert of actual factory wastewater,
FIG. 5 shows the result of comparing the oil content by the oil monitoring sensor with the calculated oil content. FIG. 5A shows the oil content when the device of the present invention is installed, and FIG. 5B shows the oil content when the device of the present invention is not installed. Table 2 shows the device specifications and operating conditions in this example. The oil monitoring sensor has
A known oil film detector (SODL-12 type) was used. FIG.
As is clear from the results of the above, according to the device of the present invention, the oil content in the waste water and the calculated oil content substantially matched, confirming the effectiveness of the device of the present invention.

[0026]

[Table 2]

[0027]

As described above, according to the apparatus of the present invention, it is possible to structurally cope with the width of the drainage culvert and to control the flow velocity energy of the wastewater flowing in the drainage culvert to make it rectified. Presence of the flow always makes it possible to cope with wavy conditions and to follow fluctuations in the amount of drainage, making it possible to accurately and stably sample oil in drainage even in large drainage culverts. This enables early detection and early response to troubles caused by oil spills, which greatly contributes to strengthening the management of factory drainage such as production process water and environmental conservation.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an apparatus for sampling oil in waste water according to the present invention.

FIG. 2 is a plan view of the oil sampling device according to the first embodiment;

FIG. 3 is a rear view of the oil sampling device.

FIG. 4 illustrates the position of an oil sampling device according to an increase or decrease in the amount of drainage in a drainage culvert, where (A) is the position of the oil sampling device when the amount of drainage is small, and (B) is the oil sampling device when the amount of drainage is large. It is the schematic which shows each position.

FIG. 5 shows a result of comparison between an oil content value calculated by an oil content monitoring sensor and a calculated oil content in the second embodiment of the present invention, wherein (A) shows an oil content value when the apparatus of the present invention is installed,
(B) is the oil content when the device of the present invention is not installed.

FIG. 6 is a schematic diagram showing a typical discharge system of industrial wastewater.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 oil recovery frame 2 floating body 3 inclined plate for drainage introduction 4 guide plate 5 portal frame 6 oil monitoring sensor 7 oil recovery pipe 8 oil recovery pump 9 oil recovery tank 10 mooring rope 11 drainage culvert 12 drainage

Claims (1)

[Claims] 1. An apparatus for sampling oil in drainage installed at an upstream portion of a drainage culvert, wherein an upper surface and a downstream side wall having a floating body attached to a bottom portion are upstream of a bottomed oil recovery frame having an opening. An inclined plate for drainage introduction is attached to the upper edge of the side, and a pair of left and right guide plates for collecting the drainage introduced from the inclined plate into the substantially central portion of the recovery frame are provided inside the recovery frame. A predetermined distance from the water surface is provided on the upper part of a gate-shaped pedestal, which is horizontally protruded substantially flush with the opening surface toward the central portion of the recovery frame above the both ends, and is integrally provided at the tip of the guide plate. An oil monitoring sensor is installed across the oil collecting frame, and the oil collecting frame is moored to the inner wall of the drain culvert by a rope or the like so as to float and swing in the drain, and is introduced into the oil collecting frame by the drain introduction slope plate. The oil in the drainage collected at the center of the collection frame by the guide plate is An apparatus for sampling oil in drainage, wherein the oil in the oil recovery frame is detected by a pump after detection by a monitoring sensor.