JP6871551B2 - Oil adsorbent and oil water treatment method and oil water treatment filter and oil water treatment equipment - Google Patents

Description

The present invention is an oil adsorbent having high oil adsorptivity, easy recovery when sprayed on the water surface, and having a small burden on the environment at the time of disposal, an oil / water treatment method using the same, and the oil adsorbent. The present invention relates to an oil / water treatment filter equipped with the above, and an oil / water treatment apparatus equipped with the same.

Generally, the wastewater discharged from a gas station or the like contains oil. In addition, at least water and oil are contained in the bilge accumulated on the bottom of a ship or the like. If this bilge is released to the outside as it is, it may cause oil pollution in the natural environment. Therefore, it was necessary to remove the oil from the bilge before discharging the bilge outboard.
Furthermore, solid oil is mixed in the wastewater (oil water) from the food service industry or food processing equipment. Therefore, when treating wastewater from the food service industry or food processing equipment, it has been an important issue not only to remove the oil but also to separate and recover the solid oil from the oil water.

Conventionally, the following are known as raw materials for a granular oil adsorbent for removing oil from such oily water in which water and oil are mixed.
For example, cotton, oga flour, wood bark (Patent Document 1), agricultural product materials such as soybeans and rapeseed as raw materials for fats and oils (Patent Document 2), heat-treated products of wood fiber and coffee squeezed residue (Patent Documents 3 and 4), Vegetable materials such as peanut shells and coffee bean husks (Patent Document 5).
Further, Patent Document 1 regarding the addition of a water-repellent material to the adsorption base material for the purpose of imparting lipophilicity to the adsorption base material made of the above-mentioned granular plant-derived material and suspending the water surface. It is disclosed in 2 and 5.
Further, as an oil water treatment method using a granular oil adsorbent and an oil water treatment device, for example, a method using a foamed granular plastic as an oil adsorbent (Patent Document 6) or a granular oil adsorbent is also used. Those using a cartridge filled with polypropylene or black stone (Patent Document 7) are known.

Japanese Unexamined Patent Publication No. 6-134299 Japanese Unexamined Patent Publication No. 7-60115 Japanese Unexamined Patent Publication No. 7-155590 Japanese Unexamined Patent Publication No. 10-99851 Japanese Unexamined Patent Publication No. 2004-167488 Japanese Unexamined Patent Publication No. 2004-195281 Japanese Unexamined Patent Publication No. 2006-198610

In the invention disclosed in Patent Document 1, bark having higher water repellency than wood is used as an adsorption base material. Further, the oil adsorbent disclosed in Patent Document 1 is provided with a water-repellent material in addition to the above-mentioned adsorbent base material, and thus has a property of adsorbing oil floating on the water surface, but the bark, particularly the bark of a coniferous tree. Has a problem that the amount of oil adsorbed is small because the specific surface area is small.
Further, even when the specific surface area is increased by crushing the bark in an attempt to increase the amount of oil adsorbed on the bark, the oil to be treated is adsorbed and held on the surface of the bark, so that the oil adsorbent was recovered. At that time, there was a concern that oil would leak from the oil adsorbent.

As the oil adsorbent disclosed in Patent Document 2, the agricultural product material containing oil is used as it is. The oil adsorbent disclosed in Patent Document 2 also has a problem that the amount of oil absorbed is small because the specific area is small, as in the case of Patent Document 1 described above.
More specifically, the oil absorption rate (oil adsorption performance) of each agricultural product material shown in Tables 2 (A) and (B) in Patent Document 2 was less than 50%.

The oil adsorbent disclosed in Patent Documents 3 and 4 is a heat-treated wood fiber or coffee grounds. The oil adsorbent disclosed in Patent Documents 3 and 4 imparts water repellency and lipophilicity (oil adsorption performance) to the oil adsorbent by heating and carbonizing the plant raw material.
In such oil adsorbents disclosed in Patent Documents 3 and 4, there is a possibility that the components contained in the plant raw material are thermally decomposed in the heat treatment step to generate another pollutant such as tar. high. In this case, when the oil adsorbent disclosed in Patent Documents 3 and 4 is sprayed on the oil water, the oil in the oil water is adsorbed on the oil adsorbent, while pollutants such as tar are eluted from the oil adsorbent into the water. There is a concern that the treated oil water will be contaminated by the components eluted from the oil adsorbent.
Further, in the case of the oil adsorbent disclosed in Patent Documents 3 and 4, the oil adsorbent becomes brittle depending on the heat treatment temperature when it is processed into the oil adsorbent, and is easily crushed by an external impact. Therefore, there was a concern that it would take time to recover from oil and water.

The oil adsorbent disclosed in Patent Document 5 uses a vegetable material such as peanut husks and coffee bean husks, which are food waste materials, as an adsorbent base material.
These have high oil adsorption performance as compared with the adsorption base material disclosed in each of the above-mentioned patent documents. Further, the oil adsorbent disclosed in Patent Document 5 is widely used for oil water treatment in food processing factories and the like because the treated oil water does not contain substances that affect health and the environment. ..
On the other hand, although the oil adsorbent disclosed in Patent Document 5 is suitable for adsorbing and removing the oil existing on the water surface of the oil water, it is shaken together with the oil water in an attempt to adsorb the oil existing in the water in the oil water. Then, there is a problem that the oil adsorbent absorbs water and settles. In this case, when the oil adsorbent disclosed in Patent Document 5 is used for oil treatment in an open system such as the sea or a lake, there is a problem that it is difficult to recover the oil adsorbent after the treatment.
Further, when the oil adsorbent disclosed in Patent Document 5 is used as a filter medium for oil and water, there is another problem that the filtrate after the filtration treatment is colored brown.

The oil adsorbent used in the oil separator disclosed in Patent Document 6 is plastic. While such a plastic filter medium has good water repellency and lipophilicity, there is a problem that the oil adsorbent is derived from fossil fuel and therefore has a large burden on the environment during its production and disposal.
Further, the oil content separating device disclosed in Patent Document 6 is used for the purpose of removing liquid oil from oil water. Therefore, for example, when oil water containing food residue or solidified oil is treated as it is by the oil content separating apparatus disclosed in Patent Document 6, clogging occurs immediately and oil water cannot be continuously treated. Had the problem.

The oil adsorbent used in the oil adsorbent cartridge disclosed in Patent Document 7 is made of polypropylene or an inorganic substance. Similar to the oil adsorbent disclosed in Patent Document 6, the oil adsorbent disclosed in Patent Document 7 has a problem that it has a large burden on the environment during its production and disposal.
Further, in the cartridge type filtration method as disclosed in Patent Document 7, the oil adsorbent is immobilized. Therefore, when the viscosity of the oil in the oil water to be treated is high, clogging is likely to occur during the filtration treatment, and there is a problem that it is difficult to improve workability.

The present invention has been made in response to such a conventional problem, and an object of the present invention is to be able to adsorb and remove not only oil water floating on the water surface during oil water treatment but also oil existing in the water, and the treated oil water. It is an object of the present invention to provide an oil adsorbent which can be easily recovered from the oil adsorbent and an oil / water treatment method using the same.
Further, the present invention relates to an oil adsorbent having a small environmental load when it is disposed of during its production and after recovery, an oil / water treatment method using the same, an oil / water treatment filter using the oil adsorbent, and the oil / water. It is an object of the present invention to provide an oil-water treatment apparatus provided with a treatment filter.
In addition, the present invention is to provide an oil-water treatment apparatus capable of efficiently treating oil-water containing food residues and solid oil.

The oil adsorbent, which is the first invention for achieving the above object, is a granular adsorption base material made of an organic porous body, and the adsorption base material is coated and / or impregnated with the adsorption base material. When a water repellent that imparts oil resistance and water repellency is provided, and the adsorption base material provided with the water repellent is mixed with water, shaken for 2 hours, and then allowed to stand for 20 minutes, it floats on the water surface. It is characterized in that the ratio (w / w) of the adsorption base material containing the water-repellent agent is 90% or more.
In the first invention having the above configuration, the adsorption base material has an action of accommodating and holding the oil inside a large number of holes formed inside the adsorption base material when it comes into contact with the oil in oil water.
Further, the water repellent has an action of imparting water repellency to the adsorption base material by coating and / or impregnating the adsorption base material. In this case, when the adsorption base material containing the water repellent is sprayed in oil water, it has an action of suspending the adsorption base material on the water surface. Further, since such a water repellent has lipophilicity, it promotes the absorption of oil into the adsorbed base material when the adsorbed base material provided with the water repellent comes into contact with the oil. It has the effect of.
Further, in the first invention, a water repellent floating on the water surface is provided when the adsorption base material provided with the water repellent and water are mixed, shaken for 2 hours, and then allowed to stand for 20 minutes. The ratio of the adsorbed base material (w / w), that is, the total weight of the first invention (dry matter weight) suspended on the water surface after shaking in the total weight of the first invention (dry matter weight) used in the levitation test. ) Is 90% or more. Therefore, even after the first invention is sprayed on the oil water and the oil water and the first invention are sufficiently stirred, the first invention can be suspended on the water surface of the oil water. This has the effect of facilitating the recovery of the used oil adsorbent when the first invention is used by spraying it on oil water.

The oil adsorbent according to the second invention comprises a granular adsorption base material made of kenaf core and a water repellent agent that coats or impregnates the adsorption base material and imparts lipophilicity and water repellency to the adsorption base material. It is characterized by having.
The second invention having the above configuration specifies the material of the adsorption base material in the first invention to be Kenaf core, and its action is the same as that according to the first invention.

The oil adsorbent according to the third invention is the first or second invention described above, wherein the maximum diameter of the oil adsorbent is in the range of 0.01 mm to 10 mm. ..
In the third invention having the above configuration, in addition to the same action as the action according to the first or second invention described above, the maximum diameter of the oil adsorbent is within the range of 0.01 mm to 10 mm, so that the oil adsorbent is an oil adsorbent. It has the effect of increasing the specific area of the oil to improve the adsorptivity of oil to the adsorption base material.
Further, when the maximum diameter of one oil adsorbent made of a single adsorbent base material or a collection of a plurality of adsorbent base materials is within the above numerical range, it can be used as a filter medium in a cartridge type oil filtration device. It becomes possible to use the third invention. In this case, it has the effect of increasing the versatility of the third invention.

The oil-water treatment method according to the fourth invention includes a spraying step of spraying the oil adsorbent according to any one of the first to third inventions on oil-water in which oil and water are mixed, and oil-water and the oil-adsorbent. It is characterized by including a mixing step of mixing the oil adsorbent and a separation step of separating and removing the oil adsorbent from the oil water.
A fourth invention having the above configuration is a method for selectively removing oil from oil water existing in a closed system or an open system by using any one of the first to third inventions described above. It was specified as an invention.
In the fourth invention of the above configuration, in the spraying step, the oil floating on the water surface of the oil water is sprayed by spraying the oil adsorbent according to any one of the first to third inventions on the oil water. It has an action of adsorbing and removing with an oil adsorbent according to any one of the inventions.
Further, the mixing step has an action of adsorbing and removing the oil existing in the oil water with the oil adsorbent according to any one of the first to third inventions.
Further, the separation step has an action of removing the oil from the oil water by separating and removing the oil adsorbent according to any one of the first to third inventions in which the oil is adsorbed from the treated oil water.

In the oil-water treatment method according to the fifth invention, oil-water in which oil and water are mixed is passed through a hollow container filled with the oil adsorbent according to any one of the above-mentioned first to third inventions. The feature is that the oil is adsorbed on the oil adsorbent and the oil is removed from the oil water while the oil water moves through the voids of the oil adsorbent.
The fifth invention having the above configuration specifies, as an invention of the method, a treatment method for selectively removing oil from oil and water by a cartridge method using any of the above-mentioned first to third inventions as a filter medium. Is.
In the fifth invention of the above configuration, each of the first to third inventions housed in the hollow container acts as a filter medium for removing oil from oil and water.
Further, in the invention of the fifth invention, the oil is selectively separated from the oil water by passing the oil water through the hollow container containing the oil adsorbent according to the first to third inventions. It has the effect of removing it.

The oil-water treatment filter according to the sixth invention is a hollow container provided with an introduction port for introducing oil-water in which oil and water are mixed, and an outlet for drawing out treated oil-water, and the hollow container. It is characterized in that it includes an oil adsorbent according to any one of the first to third inventions, which is filled therein.
The sixth invention having the above configuration specifies the above-mentioned fifth invention as an invention of a product.
In the sixth invention having the above configuration, the introduction port has an action of allowing oil and water to flow into the hollow container. Further, the hollow container has an action of holding and immobilizing the oil adsorbent according to any one of the first to third inventions in the hollow portion. Further, the oil adsorbent according to each of the first to third inventions has an action of selectively removing oil from the oil water when it comes into contact with the oil water in the hollow container. The outlet has the function of leading the treated oil water that has passed through the hollow container to the outside of the hollow container.

The oil-water treatment filter according to the seventh invention is the sixth invention described above, and the oil adsorbent in the hollow container has a layer structure composed of a group of oil adsorbents classified according to the particle size. The average particle size of the oil adsorbent group forming each layer in this layer structure is characterized by increasing or decreasing from the introduction port to the outlet.
In the seventh invention having the above configuration, among the classified oil adsorbents, those having a particularly large particle size of the oil adsorbent have an action of dispersing the oil-water flow path in the radial direction of the hollow container. On the other hand, among the classified oil adsorbents, those having a particularly small particle size of the oil adsorbent have a larger specific area of the oil adsorbent than those having a large particle size, and therefore have a larger particle size than those having a large particle size. It has the function of adsorbing and removing oil from oil and water more efficiently.
Then, in the layer structure of the seventh invention, when the average particle size of the oil adsorbent group forming each layer becomes smaller from the introduction port to the outlet, especially when the viscosity of the oil contained in the oil water is high. , It has the effect of suppressing clogging of the oil-water treatment filter.
On the other hand, in the layer structure of the seventh invention, when the average particle size of the oil adsorbent group forming each layer increases from the introduction port to the outlet, the treatment of oil water when the viscosity of the oil in the oil water is low. Suitable for. In this case, immediately after the oil water flows into the hollow container, the oil is intensively removed by the oil adsorbent group having a relatively small average particle size, so that it is difficult for the oil to remain in the treated oil water. Has an action. Further, in this case, the average particle size of the oil adsorbent group increases toward the outlet, which also has an effect of improving the fluidity of oil and water in the hollow container.

The oil-water treatment apparatus according to the eighth invention includes the oil-water treatment filter according to the sixth or seventh invention described above, and a suction facility arranged on the outlet side of the oil-water treatment filter. It is a feature.
The eighth invention having the above configuration is provided with a suction facility on the outlet side of the oil-water treatment filter in addition to the same action as the action according to the sixth or seventh invention described above, so that the suction facility is not provided. It has the effect of increasing the speed at which oil water passes through the oil water treatment filter.

The oil-water treatment apparatus according to the ninth invention is the eighth invention described above, and the oil-water treatment apparatus further includes a solid matter removal filter attached to the oil-water treatment filter, an oil-water treatment filter, and a solid matter removal filter. It is characterized by having a filter switching structure for switching between the above and the desired position.
The ninth invention having the above configuration has the same action as that of the eighth invention described above. Further, the solid matter removing filter according to the ninth aspect of the invention has an action of removing solid matter mixed in the oily water when the oily water passes through the solid matter removing filter.
Further, the filter switching structure in the ninth aspect of the invention has an effect of desiredly switching between the oil-water treatment filter and the solid matter removing filter arranged on the oil-water flow path.
Thereby, according to the ninth invention, there is provided an oil-water treatment apparatus having both a function of selectively removing solid matter from oil-water and a function of selectively removing oil from oil-water in one apparatus. It has the effect of.

According to the first and second inventions as described above, the oil adsorbing performance is particularly excellent, and even when the oil existing in the water layer in the oil water is adsorbed and removed by mixing and stirring with the oil water, the oil floats on the water surface. It is possible to provide an oil adsorbent whose properties are not impaired.
Since the oil adsorbent according to the first and second inventions continues to float on the water surface even after being added to the oil water to adsorb the oil, it is easy to recover the oil adsorbent after the oil water is treated. can do.
Further, the adsorption base materials in the first and second inventions are both made of a porous material. Therefore, when adsorbing oil in oil water, the oil can be accommodated and held in a large number of holes formed in the adsorption base material. Therefore, it is possible to preferably prevent the oil from separating from these oil adsorbents when the oil adsorbents according to the first and second inventions that have adsorbed the oil are recovered.
In addition, since the adsorbed base material in the first and second inventions are both plant-derived organic substances, when the oil adsorbent according to the first and second inventions is produced, and when oil is adsorbed, these are used. It also has the effect of reducing the burden on the environment when disposing of the oil adsorbent.
Therefore, according to the first and second inventions, the oil in the oil water can be efficiently removed only by spraying the oil water, stirring the mixture in the oil water, and then separating the oil adsorbent from the oil water. Moreover, it has the effect of being able to provide an oil adsorbent that has less impact on the environment during the production of the oil adsorbent and at the time of disposal of the oil adsorbent after recovery.

According to the third invention, since the specific area of the oil adsorbent can be increased, the removal efficiency when adsorbing and removing the oil can be improved by using the third invention.
Further, the third invention can also be used as a filler (filter medium) for a filtration filter when removing oil from oil water using a cartridge type filtration device.
Therefore, according to the third invention, it is possible to provide a highly versatile oil adsorbent that can efficiently remove oil from oil and water and can also be used as a filter medium in a cartridge type filtration device.

According to the fourth invention, the work of efficiently removing oil from oil water (for example, oil that pollutes the sea, lakes, etc.) or oil water stored in a relatively large-scale water storage facility, particularly in an open system, is efficient. You can do it with certainty.
Further, in the fourth invention, when the oil cannot be sufficiently removed by performing the series of steps only once, the series of steps in the fourth invention is repeated a desired number of times to be treated. The oil can be reliably removed from the oily water.
Therefore, according to the fourth invention, there is an effect that the oil can be easily removed by a simple method without transferring the oil water itself in the natural world or indoors.

The fifth invention has the same effect as the effect of each of the first to third inventions described above. Further, according to the fifth invention, it is possible to provide an oil-water treatment method capable of continuously removing oil from oil-water.
Further, in the fifth invention, since the oil adsorbent (each of the first to third inventions) is filled in the hollow container and fixed, the oil adsorbent dissipates into the oil water to be treated. There is no. Therefore, in the fifth invention, it is not necessary to perform the work (process) of recovering the oil adsorbent from the treated oil water.
Therefore, according to the fifth invention, the work efficiency when treating oil and water can be significantly improved.

The sixth invention specifies the fifth invention as an invention of a product, and its effect is the same as that of the fifth invention.

The seventh invention was obtained by classifying any one of the first to third inventions as an oil adsorbent (filter medium) to be filled in a hollow container in addition to the same effect as that of the sixth invention. By using the oil adsorbent group, the fluidity of the oil water flowing in the hollow container and the oil adsorption performance can be preferably controlled. More specifically, in a region where the average particle size of the oil adsorbent group is relatively large, the fluidity of the oil water in the hollow container can be increased, but the efficiency of removing the oil from the oil water is lowered. On the other hand, in the region where the average particle size of the oil adsorbent group is relatively small, the fluidity of the oil water in the hollow container is lowered, but the efficiency of removing the oil from the oil water is improved.
Further, in the seventh invention, by forming a layer structure in the hollow container by using a plurality of types of oil adsorbents having different average particle diameters as described above, the fluidity of the oil water in the hollow container and the oil water The oil removal efficiency of the oil can be designed and controlled as desired.
More specifically, in the seventh invention, when the average particle size of the oil adsorbent group increases from the introduction port (upstream side) to the outlet (downstream side) of the hollow container, the oil in the oil water Suitable for treating oily water when the viscosity is low.
On the other hand, when the average particle size of the oil adsorbent group decreases from the inlet (upstream side) to the outlet (downstream side) of the hollow container, it is suitable for treating oil water when the oil in the oil water has a high viscosity. ing.
Therefore, according to the seventh invention, the oil removal work from the oil water can be efficiently and surely performed by appropriately designing the oil water treatment filter according to the properties of the oil contained in the oil water to be treated. It has the effect of being able to do it.

The eighth invention has the same effect as that of the sixth or seventh invention described above. Further, in the eighth invention, by providing the suction equipment on the outlet side (downstream side) of the oil-water treatment filter, the flow velocity of the oil-water in the oil-water treatment filter is made faster than that in the case where the suction equipment is not provided. be able to.
As a result, a large amount of oil and water can be treated quickly and reliably by the oil and water treatment apparatus according to the eighth invention.

In the ninth invention, in addition to the same effect as that of the eighth invention described above, when the oil water mixed with the solid matter is directly supplied to the oil water treatment filter, the solid matter clogs the oil water treatment filter. It has the effect of preferably preventing the product from being raised and becoming unusable.
More specifically, for example, solid matter is mixed in the oil water temporarily stored in the grease lap in a food processing facility or the like.
Then, in the case of treating such oil water, after removing the solid matter in the oil water in advance with the solid matter removing filter according to the ninth invention, the oil water is passed through the oil water treatment filter again to allow the grease strap to pass through. Oil can be efficiently and surely removed from the oil water inside.
As a result, according to the ninth invention, when the oily water in which the solid matter temporarily stored in the grease lap is mixed is treated, the treated oily water can be poured into the sewage as it is. Can be purified.
The solid matter mixed in the oil water temporarily stored in the grease lap includes not only food residue but also solid or gel-like oil. Then, when oil water containing particularly soft gel-like oil is sucked with the same suction force as when passing through the oil-water treatment filter, the gel-like oil collapses and flows, causing clogging of the oil-water treatment filter. Become.
Therefore, it is necessary to set the suction force when passing through the solid matter removing filter to be weaker than the suction force when passing through the oil-water treatment filter.
Therefore, if a solid matter removal filter and an oil / water treatment filter are arranged in series and a suction facility is arranged on the downstream side of these in that state, the oil / water temporarily stored in the grease lap is sucked. The oil-water treatment filter becomes clogged and cannot treat oil-water.
Therefore, in the ninth invention, it is necessary to be configured so that the solid matter removing filter and the oil-water treatment filter arranged in the flow path of the oil-water to be treated can be switched as desired.
Therefore, according to the ninth invention as described above, it is possible to provide an oil-water treatment apparatus particularly suitable for treating oil-water temporarily stored in the grease lap.

It is an image figure of the cross section of the oil adsorbent which concerns on Example 1 of this invention. It is an electron micrograph which shows an example of the adsorption base material which concerns on Example 1 of this invention. It is a flowchart which shows the working procedure of the oil-water treatment method which concerns on Example 1 of this invention. It is a cross-sectional view in the central axis direction of the oil-water treatment filter which concerns on Example 2 of this invention. It is external perspective view of the oil-water treatment apparatus which concerns on Example 3 of this invention. It is a side view which shows by cutting out a part of the oil-and-water treatment apparatus which concerns on Example 3 of this invention.

The oil adsorbent, the oil / water treatment method, the oil removal filter, and the oil / water treatment apparatus according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

[About the basic structure of the oil adsorbent according to Example 1]
The oil adsorbent according to Example 1 of the present invention will be described in detail with reference to FIGS. 1 and 2.
FIG. 1 is an image of a cross section of an oil adsorbent according to Example 1 of the present invention, and FIG. 2 is an electron micrograph showing an example of an adsorbent substrate according to Example 1 of the present invention.
As shown in FIG. 1, the oil adsorbent 1 according to Example 1 has a granular adsorption base material 2 made of an organic porous body and the adsorption base material 2 coated and / or impregnated with the adsorption base material 2. It is provided with a water repellent agent 3 that imparts lipophilicity and water repellency to the base material 2.
Further, the oil adsorbent 1 according to Example 1 is an oil floating on the water surface when the oil adsorbent 1 and water are mixed, shaken for 2 hours, and then allowed to stand for 20 minutes. It has the property that the ratio (w / w) of the adsorbent 1 is 90% or more.
In the above levitation test, the ratio (w / w) of the oil adsorbent 1 floating on the water surface means that the oil adsorbent 1 floats on the water surface with respect to the total weight (dry matter weight; w) of the oil adsorbent 1 mixed with water. It is the ratio of the total weight (dry matter weight; w) of the oil adsorbent 1 present.

Here, the adsorption base material 2 of the oil adsorbent 1 according to the first embodiment will be described in detail.
[About the material of the adsorption base material 2]
As the material of the adsorption base material 2, any granular material made of a dried plant-derived porous body can be used.
Among them, a dried Kenaf core is particularly suitable for the adsorption base material 2 of the oil adsorbent 1 according to the first embodiment.
Kenaf core is the core of kenaf, a plant of the Malvales family Malvales. Kenaf skin is commonly used as an alternative to car dashboards and plywood. At the time of production of this kenaf skin, a core (kenaf core) is also produced, but the utility value of this kenaf core has not been sufficiently found so far, and most of it has been incinerated.
Such a Kenaf core is an organic porous body as shown in FIG. 2, has a very light bulk specific gravity of 0.1, and has an oil adsorption amount of 4.5 times its own weight.
Therefore, in the present embodiment, the above-mentioned Kenaf core can be used as the adsorption base material 2 of the oil adsorbent 1.

On the other hand, there is also a plant-derived organic porous body that is not suitable for the adsorption base material 2 of the oil adsorbent 1 according to Example 1. For example, the specific weight of dried peanut shells is 0.25, and the oil adsorption performance is 2.1 g / g. Such dried peanut shells have higher oil adsorbability performance as compared with conventionally known adsorption base materials such as sawdust. When a water repellent is added to the granular peanut shell and sprayed on water, the peanut shell will continue to float on the water surface for a long time if left as it is, but it will remain on the water surface even after stirring in water. Few particles remain floating.
Therefore, when dried peanut shells are used as the adsorption base material 2, the oil on the water surface of the oil water can be preferably removed, but the oil existing in the water layer of the oil water can be adsorbed and removed. Not suitable.

[About the drying method of the adsorption base material 2]
Further, as a method for drying the organic porous body (including Kenaf core) derived from a plant used as the adsorption base material 2, a conventionally known drying method can be used without any problem.
When the plant-derived organic porous body is dried by a conventionally known method, the lower limit temperature during drying is 50 ° C., more preferably 80 ° C., and the upper limit temperature during drying is 150 ° C., more preferably 110 ° C. ℃. Further, the standard drying time is 10 to 60 minutes, but there may be no particular problem even if the drying time exceeds this range.
In addition, if the drying temperature of the organic porous material derived from the plant (including Kenaf core) falls below the above lower limit, the evaporation of water from the plant does not proceed smoothly, and in some cases, putrefaction due to germs may occur. It may occur and the function as a porous body may be impaired. On the other hand, if the temperature at the time of drying exceeds the above-mentioned upper limit value, a part of the organic porous body derived from the plant may undergo thermal denaturation or thermal decomposition. Usually, a substance obtained by thermally denaturing or thermally decomposing a part of a plant-derived organic porous body elutes into water and colors the water. Therefore, when a plant-derived organic porous body partially heat-denatured or thermally decomposed is used as the adsorption base material 2, the oil water is colored during the treatment, and the colored treated oil water is used. Was not preferred because it would require purification by yet another means.

[About the action and effect of the adsorption base material 2 and the water repellent material 3]
On the other hand, the above-mentioned dried organic porous body derived from plants containing kenaf core easily absorbs water when added to water as it is, and not only does not exhibit oil adsorption performance, but also floats on the water surface. I can't leave it.
In view of such circumstances, in the oil adsorbent 1 according to the first embodiment, the water-repellent material 3 is coated and / or impregnated with the above-mentioned plant-derived dried porous body (adsorption base material 2). As a result, the adsorption base material 2 is imparted with water repellency and lipophilicity.
Further, in the oil adsorbent 1 according to the first embodiment, the adsorbent base material 2 itself has water repellency by adding the water repellent material 3 to the adsorbent base material 2. Therefore, when the oil adsorbent 1 is added to water, the oil adsorbent 1 can be suspended on the water surface. That is, by adding the water repellent material 3 to the adsorption base material 2, the adsorption base material 2 itself has a function like an air bag.
Further, when the oil adsorbent 1 according to Example 1 and water are mixed, shaken for 2 hours, and then allowed to stand for 20 minutes, 90% or more of the oil adsorbent 1 is suspended on the water surface. The fact that it can be left means that the bulk density of the adsorption base material 2 according to Example 1 is small.
Then, in the oil adsorbent 1 according to the first embodiment, the water-repellent material 3 is added to the adsorbent base material 2, so that the adsorbent base material 2 has lipophilicity, whereby the oil adsorbent material 1 becomes. It comes to have high oil adsorption performance.
Further, since ordinary oil has a lighter specific gravity than water, the larger the volume of oil adsorbed on the adsorbing base material 2, the better the floating property of the oil adsorbent 1 after adsorbing the oil.
That is, the excellent floating property of the adsorption base material 2 made of an organic porous body means that the bulk density of the adsorption base material 2 is low and the oil content adsorption performance is excellent. ..

[About the size of the oil adsorbent 1 according to Example 1]
The maximum diameter L (see FIG. 1) of the oil adsorbent 1 according to Example 1 is preferably in the range of 0.01 mm to 10 mm in particle size.
The reason for this is that if the maximum diameter L of the oil adsorbent 1 according to Example 1 is smaller than 0.01 mm, it easily scatters with the flow of air and is efficiently treated with respect to oil and water to be treated. There is a possibility that a problem may occur in which the oil adsorbent 1 cannot be supplied. On the other hand, when the maximum diameter L of the oil adsorbent 1 exceeds 10 mm, when the oil adsorbent 1 according to Example 1 comes into contact with the oil, the oil does not sufficiently penetrate into the inside of the oil adsorbent 1. There is a possibility that a problem may occur in which the oil adsorption action is not sufficiently exerted.
Further, when the maximum diameter L of the oil adsorbent 1 is larger than 10 mm, stickiness is likely to occur when the oil is adsorbed on the oil adsorbent 1, and it is difficult to handle the oil adsorbent 1 after adsorbing the oil. Another challenge arises.
In FIG. 1, the case where the oil adsorbent 1 according to the first embodiment is composed of the single adsorbent base material 2 is described as an example, but the oil adsorbent 1 according to the first embodiment is described. It may be an aggregate of a plurality of oil adsorbents 1. In this case, the maximum diameter L of the oil adsorbent 1 indicates the maximum diameter of the aggregate of the oil adsorbent 1.

Next, the water repellent material 3 in the oil adsorbent 1 according to the first embodiment will be described.
[About the material of water repellent material 3]
As described above, the water-repellent material 3 is for adding water repellency and lipophilicity to the water-absorbent adsorption base material 2, and is used for vegetable oils and fats such as soybean oil and palm oil, animal fats and oils, and minerals. Oil and the like can be used alone or in combination of two or more.
However, when the oil adsorbent 1 according to Example 1 is used by spraying it in oil water, or as a filler (filter material) for an oil water treatment filter in a cartridge type oil water treatment device as described in detail later. When used, the water repellent material 3 is selected to have a melting point higher than the maximum temperature at the time of treatment of the oil water to be treated so that the water repellent material 3 does not elute into the oil water to be treated. It is desirable to do.
More specifically, as such a water repellent material 3, for example, a material having a melting point of 50 ° C. or higher is particularly suitable, for example, a material that is resinified by polymerization such as a drying oil or a carbon value. Aliphatic saturated hydrocarbons in the range of 20-30 or mixtures thereof are suitable.
Specific examples of the water-repellent material 3 as described above include emulsion waxes such as paraffin wax, fatty acid, alcohol wax, ester wax, amide wax, and natural wax.
Further, paraffin wax is particularly suitable as the water repellent material 3 because it can be applied in a thin film on the surface of the adsorption base material 2 or can be applied substantially evenly to the adsorption base material 2. ing.
Examples of commercially available products that can be used as the water repellent material 3 include "EMUSTAR (registered trademark) -1070" manufactured by Nippon Seiro Co., Ltd.

[About the addition amount of the water repellent material 3 to the adsorption base material 2]
In the oil adsorbent 1 according to the first embodiment, the water repellent material 3 in the range of 0.02 part by weight to 0.04 part by weight is present with respect to 100 parts by mass of the particulate adsorbent base material 2. Is desirable.
The reason for this is that when the amount of the water repellent material 3 with respect to the adsorption base material 2 is less than the above-mentioned lower limit value, sufficient water repellency cannot be imparted to the adsorption base material 2 and the parent of the adsorption base material 2 is used. The oiliness is also low, and as a result, the adsorption base material 2 does not exert a sufficient effect of adsorbing oil.
On the other hand, if the amount of the water repellent material 3 with respect to the adsorption base material 2 exceeds the above upper limit value, a part of the added water repellent material 3 is retained in the pores of the adsorption base material 2 as a surplus. This causes a decrease in the oil adsorbing performance of the oil adsorbent 1.
When the water-repellent material 3 covers the surface of the adsorption base material 2 in a thin film form, the thickness of the water-repellent material 3 on the surface of the adsorption base material 2 is preferably in the range of 10 μm to 30 μm. The thickness of the water repellent material 3 on the surface of the adsorption base material 2 does not necessarily have to be substantially uniform, and the amount of the water repellent material 3 with respect to the adsorption base material 2 may be within the above numerical range.
Further, the water repellent material 3 does not need to cover the entire surface of the adsorption base material 2, and it is sufficient that a part of the surface of the adsorption base material 2 is coated and / or impregnated with the water repellent material 3.

[About the method of adding the water repellent material 3 to the adsorption base material 2]
As a method of adding the water repellent material 3 to the adsorption base material 2 according to the first embodiment, the adsorption base material 2 may be added to the liquid water repellent material 3 and these may be mixed.
For example, the adsorption base material 2 and the liquid water-repellent material 3 are weighed so as to have the above-mentioned ratios, these are put into a container, and these are further mixed and stirred to repel the adsorption base material 2. The water material 3 may be coated and / or impregnated.
Further, after the adsorption base material 2 and the water repellent material 3 are sufficiently mixed, it is preferable to dry the mixture at a relatively high temperature in order to remove the water contained in the mixture. However, in that case, it is necessary to be careful not to cause thermal denaturation or thermal decomposition of the adsorption base material 2 or the water repellent material 3 at the heating temperature.
More specifically, the drying temperature of the mixture of the adsorption base material 2 and the water repellent material 3 is preferably in the range of 70 ° C. to 100 ° C., and further in the range of 75 ° C. to 80 ° C. Is desirable.
In the oil adsorbent 1 immediately after the addition of the water repellent material to the adsorbent base material 2 is completed, a large number of particulate oil adsorbents 1 may gather together to form large particles. In that case, it is desirable to use the particles after crushing them with a crusher or the like so that the diameter of the particles composed of the aggregates of the plurality of oil adsorbents 1 is within the range of 0.01 mm to 10 mm.

For the reason of manufacturing method of the oil adsorbent 1 according to the first embodiment, the oil adsorbent 1 in the present invention is one oil obtained by coating and / or impregnating a single adsorbent base material 2 with a water repellent material 3. It is a concept that includes both a case where the adsorbent 1 is formed and a case where a plurality of adsorbent base materials 2 are integrally connected by a water repellent material 3 to form an aggregate.

[Supplementary explanation about water repellent material 3]
Further, in order to firmly fix the water repellent material 3 to the adsorption base material 2, the water repellent material 3 may be added to the adsorption base material 2 by the method shown below.
That is, the individual adsorption base material 2 that has been dried and adjusted so that the particle size is within the range of 0.01 mm to 10 mm is slowly lowered in the cylindrical body, and the falling adsorption base material 2 is used. On the other hand, the liquefied water repellent material 3 may be spray-coated.
In this case, as the cylinder for lowering the adsorption base material 2, for example, a cylinder having a diameter of 1 m and a vertical length of about 5 m can be used, and further, each adsorption base material 2 is such a cylinder. It is advisable to blow a weak wind from the lower part to the upper side of the cylinder so as to move from the upper end to the lower end of the body over 30 seconds to 5 minutes.
Further, when the molten water-repellent material 3 is spray-coated on the adsorption base material 2 while descending in the hollow portion of the cylindrical body as described above, the adsorption base material 2 and the water-repellent material 3 (water-repellent material 3) are further applied. By adding an electric charge to each of the (particulate objects) when the water is sprayed, the fixability of the water repellent material 3 to the adsorption base material 2 can be further improved.

[About the oil that can be treated by the oil adsorbent 1 according to Example 1]
By using the oil adsorbent 1 according to Example 1 as described above, oil can be adsorbed and removed from a mixture (oil water) of various types of oil and water as shown below.
That is, examples of the edible oil that can be adsorbed and removed by the oil adsorbent 1 according to Example 1 include saflower oil, soybean oil, rapeseed oil, palm oil, palm kernel oil, cottonseed oil, palm oil, rice bran oil, and sesame oil. , Sunflower oil, flaxseed oil, olive oil, tung oil, camellia oil, peanut oil, capoc oil, cacao oil, wood wax, sunflower oil, corn oil and other vegetable oils and sardine oil, herring oil, squid oil, saury oil and other fish oils. Examples include animal fats and oils such as liver oil, whale oil, beef fat, beef dairy fat, horse oil, pork fat, and sheep fat.
Further, as the mineral oil that can be adsorbed and removed by the oil adsorbent 1 according to the first embodiment, various lubricating oils such as spindle oil, refrigerating machine oil, dynamo oil, turbine oil, machine oil, internal combustion engine lubricating oil for ships, and gasoline Examples thereof include engine lubricating oil, diesel engine lubricating oil, cylinder oil, marine engine oil, gear oil, cutting oil, insulating oil, automatic transmission oil, compressor oil, hydraulic hydraulic oil, rolling oil and the like.
In addition, examples of oils other than the above that can be adsorbed and removed by the oil adsorbent 1 according to Example 1 include crude oil, heavy oil, light oil, volatile oil, various waste oils, and the like. Examples include oil-impregnated wastewater discharged from fishery processing plants, livestock processing plants, metal rolling plants, metal processing plants, and the like.
In this specification, the above-mentioned oils and fats that can be adsorbed and removed by the oil adsorbent 1 according to the first embodiment are collectively referred to as "oil". Further, the oils and fats that can be adsorbed and removed by the oil adsorbent 1 according to Example 1 may be a single substance of the oils and fats as described above, or a combination of any two or more of these oils and fats.

[About the auxiliary material of the oil adsorbent 1 according to Example 1]
When the oil adsorbent 1 according to Example 1 is used to treat oil water, which is a mixture of oil and water, to adsorb and remove unnecessary oil, the oil adsorbent 1 may be used alone. An auxiliary material for improving the oil adsorption property of the oil adsorbent 1 or an auxiliary material for facilitating the disposal treatment of the oil adsorbent 1 after adsorbing the oil may be separately added and used.
Examples of such auxiliary materials include bacteria, oil gelling agents, charcoal powder, bamboo charcoal powder, Akadama soil, clay minerals and their chemical treatments, cleaning agents and the like. Further, these auxiliary materials may be added to the oil adsorbent 1 alone, or a plurality of desired types may be selected and added.

[About the method of using the oil adsorbent 1 according to Example 1]
FIG. 3 is a flowchart showing a work procedure of the oil-water treatment method according to the first embodiment of the present invention.
When removing unnecessary oil from the oil water using the oil adsorbent 1 according to the first embodiment, each step as shown in FIG. 3 may be performed by this procedure.
The first step S1 is a spraying step of spraying and supplying a required amount of the oil adsorbent 1 according to Example 1 to the oil water to be treated.
The oil adsorbent 1 according to Example 1 is granular (single particles or aggregate particles). Therefore, in order to supply the oil adsorbent 1 to the oil water to be treated, the oil adsorbent 1 may be sprayed on the accumulated oil water. In this step S1, by spraying the oil adsorbent 1 according to the first embodiment on the oil water, the oil floating on the water surface of the oil water can be quickly adsorbed and removed.
However, oil may also be present in the water layer of the oil water to be treated, and it is said that the oil is sufficiently removed only by spraying the oil adsorbent 1 according to Example 1 on the oil water to be treated. I can't say it.
Therefore, the next step 2 is a step of mixing and stirring the sprayed oil adsorbent 1 according to Example 1 and the oil water to be treated. In this way, by firmly stirring the oil adsorbent 1 according to Example 1 and the oil water to be treated, the oil existing in the water layer of the oil water is also firmly adsorbed by the oil adsorbent 1 according to Example 1. Can be removed.
Since the oil adsorbent 1 according to Example 1 has excellent floating property, even when the oil adsorbent 1 is stirred in the oil water to be treated, it floats on the surface of the oil water again after the stirring operation.
Then, the final step S3 is a step of separating and recovering the oil adsorbent 1 according to Example 1 that has adsorbed the oil from the water surface of the treated oil water and removing it.
By performing this step S3, the work of removing the oil from the oily water is completed.
The oil-adsorbed oil adsorbent 1 recovered from the treated oil-water may be appropriately disposed of according to the type of adsorbed oil. In addition, examples of the disposal method of the oil adsorbent 1 that has adsorbed oil include incineration and biodegradation treatment by microorganisms.

The oil-water treatment method 17 according to Example 1 is a method for treating oil-water using the oil-adsorbing material 1 according to Example 1 and comprising each step from step S1 to step S3 shown in FIG.
According to the oil-water treatment method 17 according to the first embodiment, only the oil is selectively and efficiently removed from the oil-water mainly existing in the closed system or the open system without moving the oil-water. be able to.
If the oil cannot be sufficiently removed from the oil / water to be treated even after performing the series of steps shown in FIG. 3, the series of steps shown in FIG. 3 may be repeated a plurality of times.
According to the oil / water treatment method 17 according to the first embodiment, when an oil spill occurs at sea or in a lake, or in an indoor oil / water storage facility, the oil / water to be treated does not move from the place. Only oil can be removed.

The oil adsorbent 1 according to the first embodiment as described above can also be used as a filter medium (filler) in a cartridge type oil / water treatment apparatus. Then, the oil-water treatment filter according to the second embodiment is formed by filling the hollow container with the oil adsorbent 1 according to the first embodiment as a filter medium.
[About the basic structure of the oil-water treatment filter according to Example 2]
FIG. 4 is a cross-sectional view taken along the central axis of the oil-water treatment filter according to the second embodiment of the present invention. The same parts as those shown in FIGS. 1 to 3 are designated by the same reference numerals, and the description of the configuration thereof will be omitted.
As shown in FIG. 4, the oil-water treatment filter 4 according to the second embodiment has an introduction port 5a for introducing oil-water in which oil and water are mixed, and an outlet 5b for discharging the treated oil-water. The hollow container 5 provided with the above is filled with the oil adsorbent 1 according to Example 1 (for example, the oil adsorbents 1a to 1c after classification).
In the oil-water treatment filter 4 according to the second embodiment, the oil in the oil water is made to flow from the introduction port 5a of the hollow container 5 toward the outlet 5b, so that the oil in the oil water is an oil adsorbent which is a filter medium. It can be adsorbed and removed in 1.
The oil-water treatment method for removing oil from the oil-water using such an oil-water treatment filter 4 is the oil-water treatment method according to the second embodiment.

[Effect of oil-water treatment filter according to Example 2]
According to the oil / water treatment filter 4 according to the second embodiment or the oil / water treatment method according to the second embodiment, the equipment (oil / water treatment) provided with the oil adsorbent 1 (for example, the oil adsorbents 1a to 1c after classification). Although a means (pump, piping equipment, etc.) for moving the oil water to the filter 4) is required separately, there is an advantage that the oil adsorbent 1 does not dissipate into the oil water to be treated. Therefore, unlike the oil-water treatment method 17 according to the first embodiment, there is an advantage that it is not necessary to separate and remove the oil-adsorbing material 1 that has adsorbed oil from the oil-water to be treated.
Therefore, the oil-water treatment filter 4 according to the second embodiment or the oil-water treatment method according to the second embodiment has an advantage that a large amount of oil-water can be continuously treated.
Further, the oil / water treatment filter 4 according to the second embodiment or the oil / water treatment method according to the second embodiment is more suitable for the treatment of oil / water in a facility provided with piping equipment for draining the oil / water to be treated. ing.

[Detailed structure of oil-water treatment filter according to Example 2]
Further, the oil adsorbent 1 to be filled in the hollow container 5 may be used by filling the hollow container 5 as it is without being classified, but the oil is classified according to the particle size and the oil is classified. Adsorbents 1a to 1c may be laminated and used as shown in FIG. 4 (selective constituent elements).
In this case, the average particle size of the oil adsorbents 1a to 1c after classification is set as follows, and the oil adsorbents 1a to 1c after classification having a smaller average particle size are used as the outlet 5b of the hollow container 5. It may be used by arranging it on the side (downstream side) (selective component).

・ Post-classification oil adsorbent 1a: particles of 2 mm or more ・ Post-classification oil adsorbent 1b: particles of less than 2 mm to 0.5 mm ・ Post-classification oil adsorbent 1c: particles of less than 0.5 mm to 0.1 mm

In this case, when the oil water flowing in from the introduction port 5a of the hollow container 5 passes between the oil adsorbents 1a after classification having a large average particle diameter, the flow paths are dispersed in the width direction of the hollow container 5. As a result, the oil and water to be treated can flow over the entire width direction (diameter direction) of the hollow container 5.
As a result, when the oil water flows into the hollow container 5, the oil water flows only in the central portion of the hollow container 5, and the oil water does not flow in the peripheral portion thereof (water supply in the hollow container 5). Can be suitably prevented.
In this case, since the oil water can be treated by utilizing the entire radial direction of the hollow container 5, the work of adsorbing and removing the oil from the oil water can be efficiently performed.

Further, the oil-water treatment filter 4 as shown in FIG. 4 is particularly suitable for treating oil-water when the viscosity of the oil contained in the oil-water to be treated is high.
This is because the average particle size of the oil adsorbent 1a after classification arranged on the introduction port 5a side (upstream side) of the hollow container 5 is relatively larger than the average particle size of the oil adsorbent 1 in other regions. This is because even when highly viscous oil is adsorbed on the oil adsorbent 1a after classification, the hollow container 5 is unlikely to be clogged.

In the layer structure in the hollow container 5, the arrangement of the oil adsorbents 1a to 1c after classification does not need to be specified as shown in FIG. 4, and may be appropriately changed according to the properties of the oil and water to be treated.
Further, when the arrangement of the oil adsorbents 1a to 1c after classification is changed to other than those shown in FIG. 4, the introduction port 5a is used so that a water supply is not formed in the central portion of the hollow container 5 during the treatment of oil and water. The oil-water flow path may be dispersed by some means.
Furthermore, the average particle size, which is a reference when classifying the oil adsorbent 1, does not need to be specified as described above, and may be appropriately changed according to the properties of the oil and water to be treated.

Further, when the average particle size of the post-classification oil adsorbent contained in the hollow container 5 is set to increase from the introduction port 5a toward the outlet 5b, the oil water when the viscosity of the oil in the oil water is low is set. Suitable for processing.
This is because, when the viscosity of the oil in the oil water is low, a post-classification oil adsorbent (for example, a post-classification oil adsorbent 1c) having a small average particle diameter is arranged on the introduction port 5a side of the hollow container 5. However, there is little possibility that the oil-water treatment filter 4 will be clogged with the oil adsorbed on the oil adsorbent 1.

Next, the oil-water treatment apparatus according to the third embodiment will be described with reference to FIGS. 5 to 7.
[About the basic configuration of the oil-water treatment device according to Example 3]
FIG. 5 is an external perspective view of the oil / water treatment apparatus according to the third embodiment of the present invention, and FIG. 6 is a side view showing a part of the oil / water treatment apparatus according to the third embodiment of the present invention. The same parts as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description of their configurations will be omitted.
As shown in FIG. 6, the oil-water treatment apparatus 6 according to the third embodiment is provided with a suction facility 10 for generating a negative pressure in the oil-water treatment filter 4 on the outlet 5b side (downstream side) of the oil-water treatment filter 4. It will be.

[About the action and effect of the oil and water treatment device according to Example 3]
According to the oil / water treatment apparatus 6 according to the third embodiment, the oil / water in the oil / water treatment filter 4 is rapidly flowed from the introduction port 5a toward the outlet 5b by utilizing the negative pressure generated in the suction facility 10. Can be made to.
As a result, according to the oil-water treatment apparatus 6 according to the third embodiment, the oil-water can be continuously treated by the oil-water treatment filter 4 to adsorb and remove the oil in the oil-water.
Further, when the treatment is performed by leaving the natural fluidity of the oil water in the oil water treatment filter 4 without using the suction equipment 10, the oil adsorbent 1 having a small average particle size moves (floats) to the introduction port 5a side. Happened, which hindered the treatment of oil and water.
On the other hand, when the suction facility 10 is provided as in the oil / water treatment apparatus 6 according to the third embodiment, the oil adsorbent 1 having a relatively small average particle size when the oil / water flows in the oil / water treatment filter 4. However, it can be suitably prevented from moving (floating) to the introduction port 5a side.
Further, when the oil / water treatment device 6 according to the third embodiment is provided with the suction equipment 10, it is possible to prevent the oil / water from remaining in the oil / water treatment filter 4 and the piping connected to the oil / water treatment filter 4. As a result, deterioration of the sanitary condition in the oil-water treatment filter 4 and the piping connected to the filter 4 can be suitably suppressed.

[Detailed structure of the oil / water treatment apparatus according to Example 3]
Here, the oil-water treatment apparatus 6 according to the third embodiment will be described in more detail with reference to FIGS. 5 and 6.
More specifically, as shown in FIGS. 5 and 6, the oil / water treatment apparatus 6 according to the third embodiment accommodates the oil / water treatment filter 4 in the holding container 8a having an opening 8b at the upper portion, and further, the holding container 8a. The flow path changing portion 11 that also serves as the lid of the holding container 8a is covered with the opening 8b. In this way, the oil-water treatment filter 4 is sealed in a hollow container including the holding container 8a and the flow path changing portion 11.
Further, oil water (not shown) is supplied from the first oil / water inflow port 11a provided in the flow path changing portion 11 to the introduction port 5a of the oil / water treatment filter 4 stored in the holding container 8a. Will be done.
Further, on the side of the holding container 8a where the outlet 5b of the oil / water treatment filter 4 is arranged, the treated oil water (not shown) led out from the oil / water treatment filter 4 is discharged to the outside of the holding container 8a. An outlet 8c is provided, and the discharge port 8c and the suction facility 10 are connected to each other via a lead-out pipe body 9.
Therefore, in the oil / water treatment device 6 according to the third embodiment, when a negative pressure is generated by the suction equipment 10, the inside of the oil / water treatment filter 4 housed in the holding container 8a also becomes a negative pressure in conjunction with this. Further, along with this, the oil water to be treated flows into the oil water treatment filter 4 from the introduction pipe body 12 through the first oil water inflow port 11a.
Further, when the oil water sucked into the oil water treatment filter 4 passes through the oil water treatment filter 4, the oil is adsorbed and removed by coming into contact with the oil adsorbents 1a to 1c after classification, and finally for derivation. It is discharged to the downstream side (lower side of the paper surface in FIG. 5) of the suction facility 10 via the tube body 9.
As described above, according to the oil-water treatment apparatus 6 according to the third embodiment, the oil-water filtration treatment using the oil-water treatment filter 4 can be continuously performed.

[About other configurations of the oil-water treatment apparatus according to Example 3]
Further, in addition to the above configuration, the oil / water treatment device 6 according to the third embodiment may include a solid matter removing filter 7 juxtaposed with the oil / water treatment filter 4 in the holding container 8a (selective component).
When the oil-water treatment device 6 according to the third embodiment includes the solid matter removal filter 7 in addition to the oil-water treatment filter 4, the oil-water treatment filter 4 arranged on the oil-water flow path is used as a solid matter removal filter. It is necessary to provide a filter switching structure 16 for switching the solid matter removing filter 7 arranged on the oil / water flow path to the oil / water treatment filter 4.
When the oil / water treatment device 6 according to the third embodiment includes the solid matter removing filter 7 in addition to the oil / water treatment filter 4, the holding container 8a in which these are housed becomes the filter unit 8.
Further, in this case, the flow path changing portion 11 for sealing the opening 8b of the filter unit 8 is added to the first oil / water inflow port 11a for supplying oil water to the oil / water treatment filter 4 housed in the holding container 8a. A second oil / water inflow port 11b for supplying oil / water to the solid matter removing filter 7 housed in the holding container 8a is provided. The oil water supplied to the second oil / water inflow port 11b flows into the solid matter removing filter 7 from the introduction port 7a.
Therefore, in order to supply oil water to the oil water treatment filter 4 of the filter unit 8, the introduction pipe body 12 which is an oil water supply pipe may be connected to the first oil water inflow port 11a. Further, in order to supply oil water to the solid matter removing filter 7 of the filter unit 8, the introduction pipe body 12 which is an oil water supply pipe may be connected to the second oil water inflow port 11b.
Further, the treated oil and water that has passed through the solid matter removing filter 7 in the filter unit 8 is led out from the outlet 7b, and then is led out from the discharge port 8c of the holding container 8a to the outlet pipe 9.
When the oil / water treatment device 6 according to the third embodiment is configured as described above, the filter switching structure 16 in the oil / water treatment device 6 according to the third embodiment is the flow path changing unit 11.

As a method for appropriately switching between the oil-water treatment filter 4 and the solid matter removing filter 7 on the oil-water flow path, a method other than the method of changing the connection destination of the introduction pipe body 12 as described above can be considered.
For example, as shown in FIG. 6, the introduction pipe body 12 which is the oil water supply pipe is branched, and the downstream end of the branched introduction pipe body 12 is the first oil water inflow port 11a and the second. The oil / water flow path may be switched as desired by using the cock 13 provided at the branch point of the introduction pipe body 12 which is connected to the oil / water inflow port 11b.
In this case, the filter switching structure 16 in the oil-water treatment apparatus 6 according to the third embodiment is composed of the flow path changing portion 11 and the cock 13.

As another method for appropriately switching between the oil-water treatment filter 4 and the solid matter removing filter 7 on the oil-water flow path, a flow-through switching valve driven by electric power at the branch point of the introduction pipe body 12 in FIG. (Not shown) may be provided, and for example, the switch 19 provided in the oil / water treatment device 6 may be operated so that the flow path of the oil / water can be switched as desired.
In this case, the filter switching structure 16 in the oil-water treatment apparatus 6 according to the third embodiment is composed of a flow path switching valve (not shown), a flow path changing unit 11, and a switch 19.

Further, as a method other than the above for switching between the oil water treatment filter 4 and the solid matter removing filter 7 on the oil water flow path, only the first oil water inflow port 11a is provided in the flow path changing portion 11, and further. The filter unit 8 may be provided rotatably in the circumferential direction at the connection portion between the opening 8b of the filter unit 8 and the flow path changing portion 11. In this case, as a means for rotatably installing the filter unit 8 with respect to the flow path changing portion 11, the flow path changing portion 11 and the filter unit 8 may be connected, for example, via a ball bearing. Conceivable.
In addition to these, as shown in FIG. 6, a discharge port 8c is provided at the center of the bottom of the filter unit 8, and the bottom surface side of the filter unit 8 is provided on the upper surface of the support base 14 together with the discharge port 8c. The filter unit 8 may be made rotatable in the circumferential direction by fitting it in the socket 18 to be formed.
In this case, since the discharge port 8c is provided in the center of the bottom surface of the holding container 8a, the filter unit 8 is rotated in the circumferential direction thereof, and the oil-water treatment filter 4 and the solid matter removing filter 7 are switched as desired. In this case, both the treated oil and water derived from the solid matter removing filter 7 and the treated oil and water derived from the oil and water treatment filter 4 can be led out from the discharge port 8c to the outing pipe 9. ..
In this case, the filter switching structure 16 in the oil-water treatment apparatus 6 according to the third embodiment is composed of a flow path changing portion 11, a filter unit 8, a connecting portion thereof, and a socket 18.

The filter switching structure 16 in the oil-water treatment apparatus 6 according to the third embodiment does not need to be specified in the above-mentioned structure, and a structure other than the above may be adopted as long as the desired function can be exhibited without any trouble.
Then, the oil / water treatment apparatus 6 according to the third embodiment provided with such a solid matter removing filter 7 is used for treating oily water mixed with solid matter temporarily stored in the grease strap in a restaurant, a food processing facility, or the like. Especially suitable.

[How to use the oil-water treatment device 6 according to the third embodiment provided with the solid matter removing filter 7]
Usually, in the oil water temporarily stored in the grease strap, in addition to solid matter such as food residue, oil that has cooled and becomes solid or gel is also present as solid matter.
In this case, if the oil water mixed with the solid matter is treated as it is by the oil water treatment filter 4, the oil water treatment filter 4 is clogged by these solid matter, and the oil water cannot be treated.
Further, in order to avoid the above-mentioned problems when treating the oil-water mixed with the solid matter, the solid matter removing filter 7 and the oil-water treatment filter 4 are arranged in series to suck the oil-water mixed with the solid matter. The solid or gel-like oil was crushed by the suction force acting on the oil-water, and the crushed solid-like or gel-like oil clogged the oil-water treatment filter 4, making it impossible to treat the oil-water.
Therefore, when treating oily water mixed with solid matter, it is necessary to remove the solid matter from the oily water to be treated in advance.

In view of such circumstances, when treating the oil water stored in the grease strap using the oil water treatment apparatus 6 according to the third embodiment, as a pretreatment, the oil water in which the solid matter is mixed in the solid matter removing filter 7 Is supplied to remove solid matter (including solid or gel-like oil) from the oily water, and then the oily water from which the solid matter has been removed is once returned to the grease strap. After that, the oil water from which the solid matter returned to the grease strap has been removed is again fed to the oil water treatment filter 4 in the oil water treatment apparatus 6 according to the third embodiment, and the oil in the oil water is supplied using the oil adsorbent 1. Should be adsorbed and removed.
By treating the oily water from which the solid matter has been removed by the oily water treatment filter 4 in this way, it is possible to purify the treated oily water to the extent that it can be directly flowed into the sewage through the lead-out pipe body 9. ..
The filter switching structure 16 as described above can be used as a means for switching between the solid matter removing filter 7 and the oil and water treatment filter 4 when treating oily water mixed with solid matter as described above.

[Action and effect of the oil-water treatment device 6 according to the third embodiment provided with the solid matter removing filter 7]
As described above, when the oil / water treatment apparatus 6 according to the third embodiment includes the solid matter removing filter 7 and the filter switching structure 16, the treatment for removing the solid matter from the oily water mixed with the solid matter and the solid matter. The process of removing oil from the oil-water from which the substance has been removed can be performed using one device.
According to the oil-water treatment apparatus 6 according to the third embodiment as described above, the treatment for removing the solid matter from the oil-water and the treatment for removing the oil from the water can be performed separately. The degree of negative pressure generated in the filter unit 8 can be changed as desired. In this case, it is possible to preferably prevent the solid or gel-like oil from breaking when the solid matter is removed from the oily water. As a result, when oil water is treated using the oil water treatment filter 4, it is possible to prevent the oil water treatment filter 4 from being clogged with crushed solid or gel oil.
Therefore, according to the oil / water treatment apparatus 6 according to the third embodiment provided with the solid matter removing filter 7, the oily water mixed with the solid matter can be treated reliably and efficiently.

[Supplement to the oil-water treatment device 6 according to the third embodiment]
In the oil-water treatment apparatus 6 according to the third embodiment, as the material of the holding container 8a, a metal having excellent corrosion resistance such as stainless steel, a painted pail can, a reinforced plastic, or the like can be used.
Further, the shape of the holding container 8a does not have to be cylindrical as shown in FIGS. 5 and 6, and the oil-water treatment filter 4 is used alone, or the oil-water treatment filter 4 and the solid matter removing filter 7 are arranged side by side. , A form other than the one shown in the drawing may be used as long as it can be accommodated and the inside of the holding container 8a can be maintained at a desired negative pressure.
More specifically, in addition to the cylindrical shape shown in FIGS. 5 and 6, the shape of the holding container 8a is such that the upper side of the holding container 8a is cylindrical and the lower side is conical to integrate them. A thing or a square cylinder can be used.
When the shape of the holding container 8a is a square cylinder and it is necessary to rotate the holding container 8a in the circumferential direction, the socket 18 that receives the bottom surface side of the holding container 8a is rotated with respect to the support base 14. It may be configured as possible.

Further, in order to make it possible to confirm the oil adsorption status of the oil-water treatment filter 4 in the holding container 8a and the solid matter recovery status of the solid matter removing filter 7 from the outside of the holding container 8a, the flow path changing unit 11 itself. May be made of a transparent synthetic resin, or an inspection window (not shown) made of a transparent synthetic resin may be provided in the flow path changing portion 11 (all are selective components).
In this case, it is convenient because the timing of replacement of the oil / water treatment device 6 and the solid matter removing filter 7 can be visually confirmed from the outside of the holding container 8a.

Further, as the material of the hollow container 5 of the oil-water treatment filter 4 housed in the holding container 8a and the solid matter removing filter 7, a mesh material or a perforated plate made of a metal having excellent corrosion resistance such as stainless steel or reinforced plastic is used. be able to.
Further, in the hollow container 5 of the oil-water treatment filter 4, the mesh material or the perforated plate constituting the solid matter removing filter 7, individual voids (including elongated slits) or holes (not only circular but also polygonal or polygonal) or , A concept that includes holes of any shape other than these) and its formation density must be set so that liquids other than oil in oil and water can be smoothly discharged to the outside. ..
As an example of the voids or holes as described above, circular holes having a diameter of 3 to 6 mm are formed at a pitch of 20 to 30 mm on the wall surface or the bottom surface of the hollow container 5 made of metal or synthetic resin or the solid matter removing filter 7. You may keep it. When a classified oil adsorbent (for example, post-classified oil adsorbents 1a to 1c) is housed in such a container, it is necessary to devise so that the classified oil adsorbent does not flow out from the circular hole. ..

Further, in the oil-water treatment apparatus 6 according to the third embodiment, the pressure in the holding container 8a can be set to a negative pressure in the range of 100 to 400 mmHg by driving the suction equipment 10.
Further, as such a suction facility 10, not only a mixture of air and oil water but also a tube pump, a hose pump, a monoflex pump, a submersible pump, a diaphragm type air pump and the like capable of sucking only air can be used.
Further, in the oil / water treatment apparatus 6 according to the third embodiment, when the pressure in the holding container 8a becomes a negative pressure exceeding a desired set value, the vent mechanism 20 automatically causes the outside air to flow into the holding container 8a. (See FIGS. 5 and 6). The mounting position of the vent mechanism 20 may be the holding container 8a other than the flow path changing portion 11.
When the oil-water treatment device 6 according to the third embodiment is provided with the vent mechanism 20 as described above, the inside of the holding container 8a is depressurized more than necessary, and the holding container 8a is damaged or is adsorbed by the oil adsorbent 1. It is possible to prevent the oil and the crushed solid matter recovered by the solid matter removing filter 7 from being unintentionally mixed with the treated oil and water.
Further, since the oil / water treatment device 6 according to the third embodiment includes the vent mechanism 20, the effect of returning the oil / water in the lead-out pipe 9 to the grease strap after the operation of the oil / water treatment device 6 (solid matter removal filter 7). (At the time of use), or the effect of discharging the treated oil water in the lead-out pipe 9 to the outside of the oil water treatment device 6 (when the oil water treatment filter 4 is used) can be exhibited.

Further, in the oil / water treatment device 6 according to the third embodiment, as shown in FIGS. 5 and 6, a series of facilities may be installed on the transport means 15 such as a trolley (selective component). In this case, the oil-water treatment apparatus 6 according to the third embodiment can be easily manually moved to a place where the treatment of oil-water is required.
Further, when the oil-water treatment device 6 according to the third embodiment is provided with the transport means 15, it is not necessary to provide a large-scale piping facility or the like for supplying the oil-water, so that the oil-water treatment can be performed extremely easily. ..
More specifically, when the above-mentioned cleaning of the grease strap is performed manually, the working time of 30 minutes is required, but by using the oil-water treatment device 6 according to the third embodiment, the working time can be reduced. It can be shortened to about 1/3 of about 10 minutes.
Moreover, when the oil / water treatment device 6 according to the third embodiment is used, the worker does not have to perform the oil / water purification work by himself / herself, and the worker only needs to operate the oil / water treatment device 6. The physical and mental burden on the patient can be significantly reduced.
Moreover, when the oil-water treatment apparatus 6 according to the third embodiment is used, not only the solid matter can be removed from the oil-water temporarily stored in the grease strap, but also the oil in the oil-water can be removed. ..
Therefore, according to the oil / water treatment apparatus 6 according to the third embodiment as described above, not only can the work be greatly simplified as compared with the case where the grease strap is manually cleaned, but also the water quality of the treated oil / water can be greatly simplified. Can also be much cleaner.

Hereinafter, each test for demonstrating the effect of the oil adsorbent 1 according to the present invention and the results thereof will be described.
Further, in this test, the following examples of the present invention and the oil adsorbent according to the comparative example were tested. The oil adsorbent according to the examples of the present invention and the comparative examples were produced by the following procedures.
In the examples of the present invention, a kenaf core (kenaf core) was used as the raw material for the adsorption base material 2, and in the comparative example, a peanut shell was used as the raw material for the adsorption base material 2. Then, the raw materials of the adsorption base material 2 according to the examples and comparative examples of the present invention are dried in an oven at 50 ° C. for 30 minutes, and then a crusher is used so that the particle size is within the range of 0.01 to 10 mm. And pulverized to obtain an adsorption base material 2.
Next, the adsorption base material 2 according to the examples and comparative examples of the present invention is immersed in the paraffin wax emulsion "EMUSTAR (registered trademark) -1070 (manufactured by Nippon Seiwa Co., Ltd.)" to coat the surfaces thereof. And dried in an oven at 80 ° C. for 5 minutes were tested as the oil adsorbent 1 according to the embodiment of the present invention and the oil adsorbent according to the comparative example, respectively.

<Test 1: Floating test>
First, 1 g each of the oil adsorbent 1 according to the embodiment of the present invention and the oil adsorbent according to the comparative example prepared in the above procedure are collected, and put into a 300 mL Erlenmeyer flask with 100 mL of water for industrial waste. Shake with an elution shaker (manufactured by Taiyo Kagaku Kogyo Co., Ltd., model number: TS-4) for the required time, and after shaking, collect the floating oil adsorbent according to the example or comparative example, and at 105 ° C. After drying to a constant weight, the mass of each was measured. The results are shown in Table 1 below.

The oil adsorbent 1 (kenaf core) according to the embodiment of the present invention remained almost floating on the water surface even after being shaken for 2 hours, but the oil adsorbent (peanut shell) according to the comparative example was shaken for 1 minute. Later about half settled.
Since the Kenaf core used as the adsorption base material 2 of the oil adsorbent 1 according to the embodiment of the present invention contains a small amount of water-soluble substances, it is considered that the water-soluble substances and water do not replace each other and the water absorption is small. Therefore, it is expected that the oil adsorbent 1 according to the embodiment of the present invention does not settle for a long time and remains floating, and can be easily recovered after the oil water is treated.

<Test 2: Oil adsorption test in oil water>
A predetermined amount of the oil adsorbent according to the Example or Comparative Example of the present invention was put into 200 mL of 10000 ppm (mg / kg) oil water and shaken for 15 minutes, and the amount of oil in the oil water after shaking was measured. Rapeseed oil and light oil were used as the oil type of the oil and water used in Test 2. The amount of oil in the oil and water used in Test 2 was measured by the normal hexane extract substance test. In Test 2, the results when rapeseed oil was used as the oil type of the oil and water are shown in Table 2, and the results when light oil was used as the oil type of the oil and water are shown in Table 3.

When the oil adsorbent (peanut shell) according to the comparative example was used in Test 2 above, the amount of oil in the oil water after the treatment was reduced to about 2000 ppm. On the other hand, when the oil adsorbent 1 (Kenaf core) according to the embodiment of the present invention was used, the amount of oil in the oil water after the treatment was reduced to several hundred ppm. Therefore, from the results of Test 2, it was clarified that the oil adsorbent 1 according to the embodiment of the present invention adsorbs the oil in the oil water more effectively than the oil adsorbent according to the comparative example. Further, the oil adsorbent 1 according to the embodiment of the present invention remained floating on the surface of the oil water to be treated even after shaking for a required time, and its recovery was easier than that of the oil adsorbent according to the comparative example. ..

<Test 3: Treatment by filtration>
Filtration test using water in which curry powder (normal hexane extract is 33.5%) is used as simulated wastewater, assuming that the oil adsorbent 1 according to the present invention is used to treat wastewater generated in the food service industry. Was done.
In Test 3, 2 g of curry powder and 200 g of water were placed in a 300 mL Erlenmeyer flask, heated to melt the curry powder, and then allowed to stand until room temperature was used as simulated drainage.
In the filtration treatment in Test 3, suction filtration was performed, the oil in the filtrate was used as a normal hexane extractant, and the amount of oil in the treated water was measured. In addition, as another comparative example, a test using filter paper was also conducted. Light oil was used as the oil type for converting the simulated wastewater into oil water. The results of Test 3 as described above are shown in Table 4 below.

When the oil adsorbent 1 according to the embodiment of the present invention is suction-filtered using the filter medium, the treated water is smoothly discharged, the treatment time is short, and the treated oil content in the oil water is 58 mg / kg. Most of the oil was removed. Further, when the oil adsorbent 1 according to the embodiment of the present invention was used as the filter medium, the color of the treated oil and water was pale yellow, which was almost transparent.
On the other hand, when the oil adsorbent (peanut shell) according to the comparative example was used as the filter medium during suction filtration, the treatment time was long because the oil adsorbent absorbed water. In addition, the amount of oil in the treated oil and water was considerably reduced to 80 mg / kg. However, the color of the treated oil water was brown.
Furthermore, when filter paper (another comparative example) was used as the filter material during suction filtration, the filter paper was clogged and the filtration process could not be performed.
From these facts, when the oil adsorbent 1 according to the embodiment of the present invention is used as a filter material for suction filtration treatment, the treatment time is short, the treated oil water is not discolored, and the oil water is not discolored. It was shown that most of the oil could be removed, and that the oil adsorbent according to the comparative example and the filter paper, which is another comparative example, had better properties as a filter material.

As described above, the present invention relates to an oil adsorbent that has high oil adsorptivity, is easy to recover when sprayed on the water surface, and has a small impact on the environment at the time of disposal, and an oil-water treatment method using the same. An oil-water treatment filter equipped with the oil adsorbent and an oil-water treatment device equipped with the oil adsorbent, which can be used in the technical field related to the treatment of industrial or domestic wastewater and the technical field related to the removal of environmental pollutants (especially oil). is there.

1 ... Oil adsorbent 1a, 1b, 1c ... Classified oil adsorbent 2 ... Adsorption base material 3 ... Water repellent 4 ... Oil water treatment filter 5 ... Hollow container 5a ... Introduction port 5b ... Outlet port 6 ... Oil water treatment device 7 ... Solid matter removal filter 7a ... Introduction port 7b ... Outlet port 8 ... Filter unit 8a ... Holding container 8b ... Opening 8c ... Outlet port 9 ... Derivation pipe body 10 ... Suction equipment 11 ... Flow path changing part 11a ... First oil / water flow Inlet 11b ... Second oil / water flow inlet 12 ... Oil / water supply pipe 13 ... Cock 14 ... Support base 15 ... Conveying means 16 ... Filter switching structure 17 ... Oil / water treatment method 18 ... Socket 19 ... Switch 20 ... Vent mechanism (open valve)

Claims (9)

Granular adsorption base material made of Kenaf core and
An oil adsorbent that comprises a water repellent that coats or impregnates the adsorbent base material and imparts lipophilicity and water repellency to the adsorbed base material. Granular adsorption base material made of Kenaf core and
The adsorption base material is coated with and / or impregnated with a water repellent agent that imparts lipophilicity and water repellency to the adsorption base material.
When the adsorption base material containing the water repellent and water are mixed, shaken for 2 hours, and then allowed to stand for 20 minutes, the adsorption base material containing the water repellent floating on the water surface is allowed to stand. An oil adsorbent having a ratio (w / w) of 90% or more. The oil adsorbent according to claim 1 or 2, wherein the maximum diameter of the oil adsorbent is in the range of 0.01 mm to 10 mm. A spraying step of spraying the oil adsorbent according to any one of claims 1 to 3 onto oily water in which oil and water are mixed.
A mixing step of mixing the oil water and the oil adsorbent, and
An oil-water treatment method comprising a separation step of separating and removing the oil adsorbent from the oil-water. An oil-water mixture of oil and water is passed through a hollow container filled with the oil-adsorbing material according to any one of claims 1 to 3, and the voids of the oil-adsorbing material are filled. An oil-water treatment method comprising adsorbing the oil on the oil adsorbent and removing the oil from the oil-water while the oil-water is moving. A hollow container having an introduction port for introducing oil and water in which oil and water are mixed, and an outlet for drawing out the treated oil and water.
An oil-water treatment filter comprising the oil adsorbent according to any one of claims 1 to 3, which is filled in the hollow container. The oil adsorbent in the hollow container has a layer structure composed of a group of oil adsorbents classified according to the particle size thereof.
The oil-water treatment filter according to claim 6, wherein the average particle size of the oil adsorbent group forming each layer in this layer structure increases or decreases from the introduction port to the outlet. The oil-water treatment filter according to claim 6 or 7.
An oil-water treatment apparatus including a suction facility arranged on the outlet side of the oil-water treatment filter. Oil-water treatment filter and
The suction equipment located on the outlet side of this oil-water treatment filter,
A solid matter removal filter attached to the oil-water treatment filter and
A filter switching structure for switching between the oil-water treatment filter and the solid matter removing filter as desired is provided .
The oil-water treatment filter is
A hollow container provided with an introduction port for introducing oil and water in which oil and water are mixed, and the outlet for leading out the treated oil and water.
With an oil adsorbent filled in this hollow container,
The oil adsorbent is
Granular adsorption base material made of organic porous material and
The adsorption base material is coated with and / or impregnated with a water repellent agent that imparts lipophilicity and water repellency to the adsorption base material.
When the adsorption base material containing the water repellent and water are mixed, shaken for 2 hours, and then allowed to stand for 20 minutes, the adsorption base material containing the water repellent floating on the water surface is allowed to stand. oil-water treatment apparatus you wherein the ratio (w / w) of not less than 90%.

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