JP2580449B2 - Oil-water separator - 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 / water separator for separating waste water discharged from a restaurant or the like into an oil component and water.

[0002]

2. Description of the Related Art Conventionally, wastewater discharged from a restaurant or the like is mixed with animal and vegetable oils, and the wastewater separates oil components and water in a separation tank having a sedimentation tank.

Further, the wastewater is treated by mixing a neutralizing agent in a state of being stored in a settling tank.

[0004]

However, in the above-mentioned prior art, the entire apparatus is operated intermittently in the precipitation tank because it is necessary to allow time for the impurities to precipitate in the precipitation tank. Therefore, the separation of wastewater is low in quantity and quality, and the operation cannot be performed efficiently.

[0005]

According to the present invention, there is provided a separation tank having a double structure in which a separation inner tank having a bottom portion and having a lower opening is formed inside a tank having a bottom and having a lower opening. A wastewater mixed with animal and vegetable oils is supplied to the separation inner tank side of the separation tank to enable separation into oil and fat components, primary intermediate water and sludge, and the primary intermediate taken out from the separation outer tank side. In addition to a mixing device that injects and mixes a neutralizing agent such as caustic soda into water, a sedimentation separation tank that separates the coagulated intermediate water mixed with the neutralizing agent into oil and fat components and purified water is provided. The present invention provides an oil / water separation device having an oil / fat return pipe for returning an oil / fat component separated and floated to the inner side of the separation tank.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes an oil / water separator for separating waste water A discharged from a restaurant or the like into purified water B and impurities C such as fats and oils and sludge. is there.

Reference numeral 2 denotes a separation tank. In the separation tank 2, a separation inner tank 6 having a lower opening 5 is located inside a separation outer tank 4 having a bottom 3 and formed in a tank shape. It has a double structure. The upper part of the separation tank 2 is provided with an inner separation tank 6.
An inflow pipe 7 for introducing wastewater A is provided in the inner chamber 6-1.

At the base end of the inflow pipe 7, there is provided a pump means 8 for introducing wastewater A into a wastewater inlet. 9 is a heater installed at an intermediate position inside the inner separation tank 6, and 10 is an outer chamber formed between the outer separation tank 4 and the inner separation tank 6 of the separation tank 2 having a double structure. The primary intermediate water D separated by the separation inner tank 6 is stored.

Reference numeral 11 denotes a sludge discharge pipe provided at the bottom of the outer separation tank 4, 12 denotes an oil / fat extraction pipe projecting horizontally from an upper position of the inner separation tank 6 to the outside, and 13 denotes a tip of the oil / fat extraction pipe 12. , And a filtration tank 15 having a fine-meshed screen 14, and 15 is an oil / fat storage tank connected to the filtration tank 13, in which a heater 16 and a sludge drainage pipe 17 are installed.

Reference numeral 18 denotes a primary intermediate water D from the outer chamber 10 of the outer separation tank 4.
It is an outlet for taking out, and is connected to a mixing device 19 for mixing a neutralizing agent and the like.

Reference numeral 20 denotes a neutralizing agent tank containing a neutralizing agent E such as caustic soda. The neutralizing agent E is sent to the mixing device 19 by a pipe 21 and a metering pump 22. Reference numeral 23 denotes a stirrer, and reference numeral 24 denotes a flocculant tank containing a flocculant F such as a pack. The flocculant F is sent to the mixing device 19 by a pipe 25 and a metering pump 26.

Reference numeral 27 denotes a coagulation aid tank containing the coagulation aid G. The coagulation aid G is sent to the mixing device 19 by a pipe 28 and a metering pump 29 in the same manner as described above.

Reference numeral 30 denotes a sedimentation / separation tank.
Has a double structure in which the inner precipitation separation tank 32 is positioned inside the outer precipitation separation tank 31. 19A is a supply pipe for guiding the coagulated intermediate water A-1 discharged from the mixing device 19 into the precipitation / separation tank 30,
33 is a lower opening of the inner tank 32 for sedimentation separation, and 34 is an outer tank 31 for the sedimentation separation.
And the secondary intermediate water H separated by the internal precipitation separation tank 32. Reference numeral 35 denotes a sludge discharge pipe provided at the bottom of the outer tank 31 for sedimentation separation. Reference numeral 36 denotes an oil / fat return pipe connecting an upper position 37 on the inner side of the inner tank 32 for sedimentation separation and the inside of the inner tank 6 for separation. The oil / fat component or the like accumulated in the inner precipitation separation tank 32 can be discharged toward the inner separation tank 6 by the oil / fat return pipe 36.

Reference numeral 38 denotes an outlet pipe for taking out the secondary intermediate water H from the outer chamber 34 of the precipitation / separation tank 30, and the rear end of the outlet pipe 38 is connected to a sewer. Reference numeral 39 denotes a heater installed at an intermediate position inside the precipitation separation tank 32.

The embodiment of the present invention is configured as described above, and the wastewater A discharged from a restaurant or the like is supplied to the inner separation tank 6 in the separation tank 2 by the pump means 8.

The wastewater A stored in the inner separation tank 6
Is heated by the heater 9, and the sludge precipitates at the bottom and is discharged outside through the sludge discharge pipe 11.

The grease component in the waste water A floats on the top, is filtered by the grease extraction pipe 12 through the fine mesh screen 14 of the filtration tank 13, and is sent to the grease storage tank 15.

The primary intermediate water D separated in the separation tank 2 passes through the lower opening 5 of the separation inner tank 6 and passes through the separation outer tank 4.
Is stored in the outer room 10.

The primary intermediate water D is discharged to the mixing device 19 through the outlet 18, and the neutralizing agent E is mixed in the mixing device 19.
And coagulant F and coagulant G by mixing
A-1 is fed into the precipitation / separation tank 30 via the supply pipe 19A.

Next, the coagulated primary intermediate water A-1 supplied to the inner sedimentation separation tank 32 of the sedimentation separation tank 30 is sedimented and separated in the inner sedimentation separation tank 32, and the oil and fat component, the sludge, and the second intermediate water are separated. H.

The secondary intermediate water H stored in the outer chamber 34 of the precipitation / separation tank 30 is discharged as purified water through a pipe 38 as supernatant water.

The fat and oil component and the floating residue 44 floating and stored in the inner precipitation separation tank 32 in the precipitation and separation tank 30 are removed from the oil and fat return pipe 36.
Is returned to the inner tank for separation 6.

As described above, in the above embodiment, the separation inner tank 6 having the bottom 3 and formed in the shape of a tank and having the lower opening 5 is positioned inside the outer separation tank 4 to form a double structure. The separation tank 2 is provided, and wastewater A containing animal and vegetable oils is supplied to the separation inner tank 6 so that it can be separated into the oil and fat component and the primary intermediate water D, and is taken out from the separation outer tank 4 side. A mixing device 19 is provided for injecting and mixing a neutralizing agent E such as caustic soda into the primary intermediate water D, and a sedimentation separation tank 30 is provided for separating / floating the coagulated intermediate water A-1 mixed with the neutralizing agent. Since the wastewater discharged from restaurants, etc., the separated animal and vegetable oils and residual rice contained in the wastewater are surely separated by the double-structure separation tank 2, and the primary intermediate water is taken out. Further, the same intermediate water is injected into the mixing device 19 with a neutralizing agent or the like. Thus, the separation in the precipitation separation tank is performed quickly and reliably.

[0024] The fatty acid component can be easily produced from the wastewater by extracting the fat component from the wastewater.

Further, it is possible to continuously treat wastewater,
In addition, the quality of the treated water is stable and the treatment cost can be reduced.

Moreover, the oil-water separator can automatically treat the wastewater, so that it requires less labor and is safe.

[0027]

According to the present invention, a separation tank having a double structure is provided by positioning a separation inner tank having a bottom portion and formed in a tank shape and having a lower opening inside a separation outer tank. The wastewater mixed with animal and vegetable oils is supplied to the separation inner tank side of the separation tank to enable separation into oil and fat components and the primary intermediate water, and the primary intermediate water taken out from the separation outer tank side to caustic soda etc. Since a mixing device for injecting and mixing the neutralizing agent is provided and a sedimentation separation tank for separating the coagulated intermediate water mixed with the neutralizing agent is provided, wastewater discharged from restaurants and the like is The animal and vegetable oils and garbage contained in the water are surely separated by the double-structured separation tank, the primary intermediate water is taken out, and the same intermediate water is separated into the sedimentation separation tank by injection of a neutralizing agent in a mixing device. Separation is quickly and reliably performed within Than it is.

The fat and oil component is taken out from the waste water to easily produce a fatty acid industrial raw material.

Further, it is possible to continuously treat wastewater,
In addition, the quality of the treated water can be stabilized and improved, and the treatment cost can be reduced.

In addition, the oil separation device can automatically treat wastewater, so that it requires less labor and is safe.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an oil-water separation device according to the present invention.

[Explanation of symbols]

 A Wastewater A-1 Coagulated intermediate water D Primary intermediate water E Neutralizer 1 Oil / water separator 2 Separation tank 3 Bottom 4 Separation outer tank 6 Separation inner tank 30 Precipitation separation tank 36 Oil return pipe

Claims (1)

(57) [Claims] 1. A separation inner tank having a bottom (3) and formed in a tank shape and having a lower opening (5) inside a separation outer tank (4).
(6) is located and a separation tank (2) with a double structure is provided.
The wastewater (A) mixed with animal and vegetable oils is supplied to the separation tank (6) side of the separation tank (2) so that the oil and fat component can be separated into primary intermediate water (D) and sludge, and A mixing device (19) for injecting and mixing a neutralizing agent (E) such as caustic soda into the primary intermediate water (D) taken out from the outer separation tank (4) side is provided, and the neutralizing agent (E)
A sedimentation separation tank (30) for separating the coagulated intermediate water (A-1) into which the oil and fat components and purified water have been mixed.
0) An oil / water separation device comprising an oil / fat return pipe (36) for returning the separated and floated oil / fat component to the inner separation tank (6).