JP2551465Y2 - Oil removal equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil removing device for removing oil and scum from kitchen wastewater, particularly of hotels, restaurants, bento manufacturers and the like.

[0002]

2. Description of the Related Art A grease trap has been widely used as an apparatus for removing oil from gray water.
The grease trap utilizes the difference in specific gravity between water and oil to bend the drainage flow passage to raise the oil content and to allow natural separation from the flow passage. However, this grease trap alone cannot meet the standards set by the Water Pollution Control Law or local governments in places where large amounts of oil-containing wastewater are discharged, such as hotels, restaurants, and lunch box manufacturers. It was difficult.

[0003] As a general wastewater treatment facility, there is a facility using a pressurized flotation method, which generates microbubbles and raises them by the buoyancy of the bubbles themselves in a state where particles such as oils and fats are adhered to float and separate them. Conventionally, a large amount of a coagulant was generally required. For this reason, a large amount of sludge mixed with a chemical is generated, and a great deal of cost is required for the treatment, the management of the chemical, and the maintenance and management of the auxiliaries. In addition, conventional equipment requires a large-scale device and requires a large space, and the price of the device itself is extremely expensive. Installation of the device was difficult.

[0004]

[Problems to be Solved by the Invention] The problem of the present invention is that the oil in the gray water can be efficiently removed without using chemicals, and the processing cost is greatly reduced by minimizing the generated sludge. An object of the present invention is to provide a compact and simple oil removing device which can reduce the amount of oil.

[0005]

The gist of the present invention to solve the above problems is as follows: 1) The inside of the apparatus body is partitioned by a weir plate having a predetermined height, and the upstream section is filled with raw sewage water and solidified in raw water. A sedimentation separation zone for sedimentation and separation of the material, and a downstream section as a flotation separation zone for floating and separating oil in the sewage raw water, the sewage raw water flowing into the sedimentation separation zone passing over the weir plate in a substantially horizontal direction. A flow straightening guide is provided at the upper end of the weir plate so that it flows into the floating separation zone only as an overflow, and the oil skimmer that adheres to the oil floating near the water surface at the downstream position in the floating separation zone and discharges it to the oil storage tank along the discharge direction Oil removal device, which is detachably mounted while being gently inclined upward and a drain port is provided at the bottom at the most downstream position. 2) A rising air flow is generated near the bottom in the floating separation zone. The oil removing device according to claim 1, further comprising an air diffuser opening.

[0006]

In the oil removing device of the present invention, the raw sewage is first flowed into the sedimentation separation zone. However, the only flow path from the sedimentation separation zone to the flotation separation zone downstream of the sedimentation separation zone is a flow path that overflows beyond the weir plate. Therefore, the sand and other solids in the raw sewage flowing into the sedimentation separation zone settle and are separated without passing over the weir plate. Further, the oil droplets have a specific gravity lower than that of water, so that the oil droplets float, and surely overflow into the downstream floating separation zone. At this time, since the rectifying guide is provided at the upper end of the weir plate, the once-floating oil droplets flow into the floating separation zone almost horizontally and quietly while floating near the water surface.

[0007] With this rectifying guide, the raw sewage gently flows toward the drainage port in the flotation zone, and it is possible for small-diameter oil droplets to float near the water surface. Then, the oil droplets floating near the water surface adhere to the oil skimmer mounted at the downstream position, and are surely carried out and separated into the oil storage tank. In addition, since the oil skimmer is made detachable, replacement becomes easy, so that it is easy to cope with a case where the oil skimmer is very dirty or a case where the oil type is different.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described with reference to the following drawings. 1 is a sectional explanatory view showing an embodiment, FIG. 2 is a plan view of the same, FIG. 3 is a sectional side view of the same, FIG. 4 is a side view of the same, and FIG.

In this embodiment, the main body of the apparatus is roughly divided into two parts.
An example is shown in which the oil is removed twice so that finer oil droplets can be separated. By disposing the oil removing device 1 according to the present invention in the first half, and subsequently flowing the raw sewage water into the second oil removing device 2, it is possible to separate those having an oil droplet diameter of 60 μm or more.

The inside of a water tank which is the apparatus main body 3 of the oil removing device 1 is divided into a sedimentation separation zone 5 by dividing a front end portion thereof by a weir plate 4 and a flotation separation zone 6 at a central portion. The rear is partitioned by a swash plate 7, the upper part is an oil storage tank 8, and the lower part of the oil storage tank 8 is an outlet 9. Reference numeral 10 denotes a discharge port of the sewage raw water, and reference numeral 11 denotes a screen for removing large solids in the sewage raw water.

The lower half portion 4a of the weir plate 4 is freely openable around the support shaft 12, and the sedimentation separation zone 5 can be opened below the apparatus main body 3 to facilitate discharge of sediment.
An arc-shaped rectifying guide 13 is provided at the upper end of the weir plate 4, and the inflowed sewage flows over the rectifying guide 13. Reference numeral 14 denotes a protruding plate that prevents the solid B settled in the sedimentation separation zone 5 from re-floating and promotes the floating of the oil droplet A.

The air diffuser 1 is located near the bottom of the flotation zone 6.
5 are provided to generate rising air bubbles 16. Thereby, the floating rate of the oil droplet A is increased. The oil droplets A floating near the water surface of the floating separation zone 6 flow downstream, adhere to the surface of the infinite belt 18 of the oil skimmer 17, and are carried out to the oil storage tank 8. 19 is a pulley, 20 is a scraping plate for oil droplets, and 36 is a motor for driving the rotation of the belt 18.
The infinite belt 18 is of a detachable type that can be adapted to the type of oil and is easy to replace.

In the above-mentioned oil removing device 1, the oil droplet diameter 20
Although those having a diameter of 0 μm or more can be separated and removed, finer oil droplets A ′ flow into the oil removing device 2 via the outlet 9 while being mixed in the raw water.

The device main body 21 of the oil removing device 2 is divided by a dam plate 23 provided with a rectifying guide 22 in the same manner as the dam plate 4 of the oil removing device 1. The flotation zone 25 is used. The raw water inlet 26 to the inflow zone 24 is arranged near the bottom of the inflow zone 24 in this embodiment. The oil droplets A 'in the raw water flowing into the inflow zone 24 are floated by the rising air bubbles 28 from the air diffuser 27,
2 and overflows to the flotation zone 25.

In the flotation zone 25, a core 29 inclined downstream is provided, and the core 29 forms an elongated honeycomb-shaped flow path. An air diffuser 30 is provided near the outlet of the core 29 to generate fine air bubbles flowing backward through the flow path in the core 29. Because of this bubble,
The oil droplet A ′ is pushed back without being able to pass through the core 29, floats near the water surface, and is raised by the oil skimmer 31 to the oil storage tank 3.
It is carried out to 2. Reference numeral 37 denotes a motor that rotationally drives the oil skimmer 31. In addition, since the inside of the core 29 is always washed by the bubbles, it can be used for a long time.

Downstream of the flotation zone 25, an inverted U-shaped bent flow path is formed to constitute a green strap 33. The grease strap 33 floats and separates the finer oil droplets A ″, so that the oil droplet diameter is approximately 60 μm.
m or more can be removed. Reference numeral 34 denotes a detachable discharge pipe.

Further, in this embodiment, since the upper surfaces of the apparatus main bodies 3 and 21 are sealed with the water seal type cover 35, the processing can be performed without generating odors and pests. Further, in this embodiment, an example is shown in which two oil removing devices 1 and 2 are arranged side by side in the horizontal direction, but they may be arranged in the vertical direction, in which case the device can be made more compact. Of course, each can be installed independently.

[0018]

According to the present invention, as described above, only the oil component can be reliably removed by the oil skimmer, and no coagulant or the like is used at that time. Can be reduced. Therefore,
The cost for sludge treatment can be significantly reduced. By installing a dehydrator, incinerator, etc., it is possible to treat sludge in-house.

Further, the oil removing device of the present invention has a very simple and compact structure, and does not require a large space. In addition, since the number of attached devices is small, the service life is long, no advanced management technology is required, and the installation cost and running cost can be reduced.

According to the present invention, as described above, the oil removing device can be provided at very low cost.
It has a wide range of uses, such as restaurants, food processing factories, oil recovery vessels, oil recovery vehicles, etc. Further, a treatment plant in which a kitchen cleaning system, a sludge treatment system, and the like are integrated can be configured.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment.

FIG. 2 is a plan view showing an embodiment.

FIG. 3 is a side sectional view showing an embodiment.

FIG. 4 is a side view showing the embodiment.

FIG. 5 is an overall perspective view showing an embodiment.

[Explanation of symbols]

 Reference Signs List A oil droplet A 'oil droplet A "oil droplet 1 oil removing device 2 oil removing device 3 device main body 4 dam plate 5 sedimentation separation zone 6 flotation separation zone 7 swash plate 8 oil storage tank 9 outlet 10 discharge port 11 screen 12 support Shaft 13 Rectifying guide 14 Protruding plate 15 Air diffuser 16 Air bubble 17 Oil skimmer 18 Infinite belt 19 Pulley 20 Scraper 21 Device body 22 Rectifying guide 23 Weir plate 24 Inflow zone 25 Floating separation zone 26 Inlet 27 Air diffuser 28 Bubbles 29 Core 30 Air diffuser 31 Oil skimmer 32 Oil reservoir 33 Grease strap 34 Discharge pipe 35 Water seal cover 36 Motor 37 Motor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hironori Nakazono 2-2-27 Kinrakuji-cho, Amagasaki City, Hyogo Prefecture Inside the Takuma Plant Co., Ltd. (56) References JP-A-3-213189 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. An inside of an apparatus main body is partitioned by a weir plate having a predetermined height, an upstream section is a sedimentation separation zone for flowing sewage raw water and sedimenting and separating solids in the raw water. A floating separation zone that floats and separates oil in water,
A rectification guide is provided at the upper end of the weir plate so that the raw sewage flowing into the sedimentation separation zone flows into the flotation separation zone only as an overflow in the substantially horizontal direction beyond the weir plate, and near the water surface at a downstream position in the flotation separation zone. The oil skimmer that attaches the floating oil and carries it out to the oil storage tank is detachably mounted in a state that it is gently inclined upward along the carrying direction, and a drain port is provided at the bottom at the most downstream position. Oil removal device. 2. The air diffusion port for generating an ascending air flow is provided near the bottom in the flotation separation zone.
An oil removing device as described in the above.