JP2011131153A - Oil separator and oil separation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil separator that separates oil content from waste containing solid content and the oil content capable of improving a separated amount. <P>SOLUTION: The oil separator including a treating tank 10 into which the waste 1 containing the oil content is injected and in which a solution of non-acidity is filled, a separating tank 20 that can separate the oil content from a mixture of the solution and oil content that inflow from the treating tank 10, and a micro-bubble generator 40 that generates micro-bubbles in the solution that is sent to the treating tank 10, is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil separation device and an oil separation method for separating oil from waste containing oil.

  Conventionally, recycling for producing fertilizer and feed from food waste has been performed. If the amount of oil contained in food waste is high, the carbon ratio will not be appropriate for fertilizer and feed. Therefore, in order to use it as fertilizer or feed, it is necessary to remove the oil contained in food waste during the recycling process. .

  Patent Document 1 discloses an oil separation method for food residues in which water is added to a food residue and washed with high-temperature steam to release the oil, and the oil is separated by pressing with a screw press.

JP-A-7-207295

  However, in the oil separation method as disclosed in Patent Document 1, it is possible to separate oil from solids to some extent, but since hot water is used, there is a limit to improving the amount of oil separated. For this reason, it has been difficult to obtain fertilizers and feeds with low oil content from food waste.

  Then, an object of this invention is to provide the oil separation apparatus and oil separation method which can further improve the separation amount which isolate | separates oil from a waste material.

  The present invention is a treatment tank filled with an acid-containing waste and filled with a non-acidic solution, a separation tank capable of separating oil from a mixed liquid of the solution and oil flowing in from the treatment tank, and the treatment And a microbubble generator for generating microbubbles in a solution filling the tank.

  In the present invention, the treatment tank into which the waste containing oil is charged is filled with the solution containing microbubbles. In the treatment tank, the microbubbles are adsorbed on the waste oil, and the oil is floated in the solution. The solution in the treatment tank containing the oil is separated into oil and water in the separation tank. Therefore, it is possible to remove the oil from the waste and to separate the oil from the solution. Since microbubbles have the property of being easily adsorbed by oil, the amount of oil separated from waste can be improved compared to when hot water is used.

It is a lineblock diagram of the oil separation device concerning an embodiment of the invention.

  Hereinafter, with reference to FIG. 1, the oil separation apparatus 100 which concerns on embodiment of this invention is demonstrated.

  The oil separation device 100 removes and separates the oil from the solid waste 1 containing the oil, and takes out the waste 1 from which the oil has been removed and the separated oil in a recyclable manner. In the oil separator 100, a non-acidic solution is used to take out oil from the waste 1. Here, a case where the solution is water will be described.

  The waste 1 is a food waste such as a food residue, and is crushed and solidified again to become a solid. The food waste contains oil, and when the food waste is recycled into fertilizer or feed, it is necessary to add a mixture for removing or neutralizing the oil. Therefore, effective recycling of food waste has been difficult.

  The oil separation device 100 is a treatment tank 10 filled with water containing microbubbles and into which waste 1 is charged, and a separation tank capable of separating water that flows from the treatment tank 10 and contains oil into oil and water. 20.

  The treatment tank 10 is a tank that is formed with an open top surface and removes oil from the waste 1. A hole 12 is formed in the bottom surface of the processing tank 10, and a microbubble generator 40 described later is disposed in the processing tank 10. The treatment tank 10 is filled with water containing microbubbles introduced through the holes 12 and generated by the microbubble generator 40. The waste 1 is put into the treatment tank 10 from the upper opening. When hot water is used, a heat source and heat energy for heating the water are required, but since water containing microbubbles is used at room temperature, a heat source and heat energy are not required.

  A microbubble is a fine bubble in a liquid, and generally has a diameter of about several μm to several tens of μm when it is generated. Note that bubbles having a diameter smaller than 1 μm are called nanobubbles. In the oil separator 100, air microbubbles are used as microbubbles.

  As a method for generating microbubbles, there are a method in which a gas and a liquid are pressurized to a high pressure to dissolve the gas in a liquid, a method in which a gas is put into a vortex of a liquid rotating at high speed, and a gas is sheared by collision. Normal bubbles rise to the surface of the water and bounce and disappear, but microbubbles rise slowly compared to normal bubbles and are released to the atmosphere, or dissolve and disappear in water.

  Microbubbles are thought to be negatively ionized in water. Since the negatively ionized microbubbles are negatively charged, they do not bind even if the microbubbles come into contact with each other, and are easily attached to positively charged ones. On the other hand, the oil contained in the waste 1 is positively charged by being oxidized by contact with air or moisture. Therefore, the microbubbles have a property of being easily adsorbed on the oil content of the waste 1.

  The microbubbles are adsorbed on the oil content of the waste 1 and float on the liquid surface of the treatment tank 10 by buoyancy. Water and oil are mixed and accumulated on the liquid surface of the treatment tank 10. Since it is considered that the microbubbles enter between the solid content of the waste 1 and the oil content when adsorbed to the oil content, and the oil content is peeled off from the solid content, it is desirable that the diameter of the microbubble is as small as possible.

  The processing tank 10 includes an outflow weir 11 formed by lowering a part of the side wall. The outflow weir 11 is formed facing the separation tank 20. The water supplied to the processing tank 10 overflows from the processing tank 10 and flows out from the outflow weir 11 to the separation tank 20 when the water level rises to a height at which the outflow weir 11 is formed. Water flows from the treatment tank 10 into the separation tank 20 together with the oil accumulated on the liquid surface. That is, the treatment tank 10 introduces water containing microbubbles from below the waste 1 and causes the water containing oil to flow out from above the waste 1 to the separation tank 20.

  The separation tank 20 is an open top surface and is a tank for separating a mixture of oil and water into oil and water. The separation tank 20 is formed integrally with the processing tank 10, but may be a separate body. The inside of the separation tank 20 is partitioned into an upstream tank 22 and a downstream tank 23 by a partition plate 21. The inside of the separation tank 20 is divided into two tanks, but is not limited to two tanks, and may be divided into three or more tanks.

  In the partition plate 21, a lower opening 21a as a communication portion is formed in the vicinity of the bottom of the separation tank 20, and the upstream tank 22 and the downstream tank 23 communicate with each other through the lower opening 21a.

  On the liquid surface of the upstream tank 22, oil that has floated due to the difference in specific gravity accumulates to form an oil layer 2. Under the oil layer 2, water that has sunk due to the difference in specific gravity is accumulated. Thereby, the liquid mixture of oil and water that has flowed into the separation tank 20 is separated into oil and water. At this time, the microbubbles are either released from the liquid surface into the atmosphere, dissolved in water and disappeared, or remain in water or oil.

  The oil separation device 100 is a vortex pump 30 serving as a solution supply device that supplies water collected from the separation tank 20 through the upstream flow path 31 to the treatment tank 10 through the downstream flow path 32, and gas that is a source of microbubbles. The air supply device 41 that supplies air to the vortex pump 30, the microbubble generator 40 that generates microbubbles in the water supplied to the treatment tank 10, and the vortex pump 30 are supplied from the separation tank 20 to the treatment tank 10. And a replenishing tank 50 as a solution replenishing device for replenishing water when the amount of water is reduced.

  The vortex pump 30 sucks water from the separation tank 20 through the upstream flow path 31 and discharges it to the processing tank 10 through the downstream flow path 32. In the vortex pump 30, the air supplied from the air supply device 41 and the water sucked from the separation tank 20 are mixed. While the water flowing through the upstream flow path 31 has a small content of microbubbles, the water flowing through the downstream flow path 32 is supplied with air by the air supply device 41, and thus has a high air content. .

  The replenishing tank 50 is connected to the upstream flow path 31 via a valve (not shown). Water is stored in the replenishment tank 50, and when the amount of water supplied from the vortex pump 30 is reduced by vaporization during the operation of the oil separation device 100, the upstream flow path 31 is replenished with water. To do. The water may be replenished by connecting to a water source such as a water supply instead of the replenishment tank 50.

  The microbubble generator 40 is a device that is provided at the tip of the downstream flow path 32 that passes through the hole 12 and generates microbubbles in water based on the air supplied from the air supply device 41. The microbubble generator 40 shears the air contained in the water supplied through the downstream flow path 32 and generates microbubbles in the water supplied to the treatment tank 10.

  Hereinafter, an oil separation method using the oil separation device 100 will be described.

  First, the waste 1 is put into the treatment tank 10, and the waste 1 containing oil and water containing microbubbles are mixed. At this time, the waste 1 may be thrown into the place where the water containing the microbubbles is accumulated in the treatment tank 10, and the vortex pump 30 is operated after the waste 1 is thrown first to separate the waste 1. The water stored in the tank 20 may be sucked to generate microbubbles in the microbubble generator 40 and supplied into the processing tank 10.

  When water containing microbubbles is supplied to the treatment tank 10, the microbubbles are adsorbed by the oil contained in the waste 1, and the oil is floated on the liquid surface by buoyancy. As a result, the oil contained in the waste 1 is removed. When the liquid level in the treatment tank 10 becomes higher than the height of the outflow weir 11, the mixed liquid of oil and water floating on the liquid surface flows into the upstream tank 22 of the separation tank 20 from the outflow weir 11.

  In the upstream tank 22, the liquid mixture of oil and water is separated into oil and water due to the difference in specific gravity. There is no solid content in the upstream tank 22, and only liquids of water and oil are stored. Since the specific gravity of oil is lighter than that of water, it floats on the water and separates to form the oil layer 2, and water accumulates under the oil layer 2.

  The water stored in the upstream tank 22 passes through the lower opening 21 a of the partition plate 21 and flows into the downstream tank 23. Therefore, oil does not flow into the downstream tank 23, and only water flows.

  The water stored in the downstream tank 23 is sucked by the vortex pump 30 and flows into the upstream flow path 31. The water flowing through the upstream flow path 31 is supplied with air from the air supply device 41 by the vortex pump 30. Water discharged from the vortex pump 30 to the downstream flow path 32 is introduced into the treatment tank 10 from the hole 12 of the treatment tank 10, microbubbles are generated by the microbubble generator 40, and supplied to the treatment tank 10 again. The

  When a predetermined time elapses after the waste 1 is put into the treatment tank 10, the oil contained in the waste 1 is removed in the treatment tank 10, and the liquid mixture of oil and water is removed in the separation tank 20. Is separated into oil and water. As a result, the waste 1 is separated into the solid from which the oil has been removed and the oil.

  The waste 1 is taken out from the processing tank 10 by a take-out device (not shown). Since the taken-out waste 1 has a low oil content, it is suitable for use as a fertilizer or feed.

  Further, the oil in the oil layer 2 of the separation tank 20 is taken out from the separation tank 20 by a suction device (not shown) and recycled, for example, as regenerated fuel.

  According to the above embodiment, the following effects are obtained.

  In the oil separator 100, the microbubbles are adsorbed to the oil contained in the waste 1 in the treatment tank 10, and the oil is levitated to the liquid surface by buoyancy. The mixed liquid of water and oil is separated into oil and water by the specific gravity difference in the separation tank 20. Therefore, the oil component can be removed from the waste 1, and the oil component can be extracted from the liquid mixture of water and oil. Since microbubbles have the property of being easily adsorbed by oil, the amount of oil separated can be improved compared to when hot water is used.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  For example, instead of food waste as the waste 1, metal cutting powder generated during metal processing may be input. Since cutting oil is used during metal processing, the cutting oil is mixed with the metal cutting powder. Usually, when this metal cutting powder and cutting oil are separated, an organic solvent is used, which causes a problem of environmental pollution. Moreover, it is difficult to recycle the cutting oil mixed with the organic solvent.

  On the other hand, in the oil separation apparatus 100, since the cutting oil is removed only with water and air, it is not necessary to use an organic solvent, and the problem of environmental pollution does not occur. Moreover, since the cutting oil removed from the metal cutting powder accumulates on the liquid surface of the separation tank 20, it can be reused as the cutting oil.

  When the metal cutting powder is thrown in as the waste 1, the metal cutting powder is put into the treatment tank 10 in a state of being placed on a net-like holder so that the microbubbles can pass between the metal cutting powders. As a result, the microbubbles in the water can enter the gap between the metal cutting powders, and the cutting oil can be adsorbed and floated.

  In addition to this, it can also be used for further extraction of oil after squeezing plants, extraction of oil contained in soil, oil / water separation of wastewater discharged from factories, and the like.

  INDUSTRIAL APPLICABILITY The present invention can be used as an apparatus that removes oil from solids containing oil such as waste.

100 Oil separator 1 Waste 2 Oil layer 10 Treatment tank
DESCRIPTION OF SYMBOLS 11 Outflow port 20 Separation tank 30 Eddy current pump 31 Upstream flow path 32 Downstream flow path 40 Microbubble generator 41 Air supply apparatus

Claims (9)

A treatment tank filled with oil-containing waste and filled with a non-acidic solution;
A separation tank capable of separating oil from a mixed liquid of the solution and oil flowing in from the treatment tank;
An oil separation apparatus comprising: a microbubble generator that generates microbubbles in a solution that fills the treatment tank.   The oil separator according to claim 1, further comprising a solution supply device that mixes a gas that is a source of microbubbles with the solution collected from the separation tank and supplies the mixture to the microbubble generator.   The oil separation device according to claim 2, further comprising a solution replenishing device capable of replenishing the solution when the solution supplied by the solution supplying device decreases. The separation tank is
An upstream tank that separates the liquid mixture flowing from the processing tank into a solution and an oil component according to a difference in specific gravity;
The oil separation device according to any one of claims 1 to 3, further comprising a downstream tank formed such that a solution can flow in from a communication portion at a lower part of the upstream tank.   The treatment tank introduces a solution containing microbubbles from below the waste, and causes the solution containing oil to flow out from the waste to the separation tank. The oil separator according to any one of the above.   The oil separation apparatus according to any one of claims 1 to 5, wherein the waste is food waste.   The oil separator according to any one of claims 1 to 5, wherein the waste is metal cutting powder.   8. The oil separator according to claim 7, wherein the metal cutting powder is placed on a mesh-shaped holder and is put into the processing tank. Generate microbubbles in non-acidic solution,
Mix the waste containing oil and the solution containing microbubbles, remove the oil from the waste by adsorption of microbubbles, float the oil in the solution,
An oil separation method comprising separating oil from a solution in which the oil floats.

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