JP2008289952A - Oil/water adsorbent, and water cleaning agent and method for treating oil component employing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel oil/water adsorbent for efficiently adsorbing an oil component (an oil film) floating on the surface of water such as water-containing oil having leaked to the engine room of a yacht or a ship (including a fishing boat), bilge, (sea)water-containing oil having leaked to a port, water-containing oil present in the vicinity of machines installed in various factories and water-containing oil on the floors of various factories, and in particular an oil component dispersed in water (an emulsion), and to provide a water cleaning agent and a method for treating an oil component employing the same. <P>SOLUTION: The novel oil/water adsorbent for adsorbing an oil component (an oil film) floating on the surface of water and an oil component dispersed in water (an emulsion) is characterized by comprising a water-absorbing polymer and adsorbent carbon prepared by heating and carbonizing the mesocarp of a coconut. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In particular, the present invention includes oil and bilge (seawater containing oil accumulated in the bottom of the ship), yachts and ships (including fishing boats), including oil leaked around the machine room of ships such as yachts and ships (including fishing boats). Oil containing water leaked to the dock (such as seawater), oil containing water around machines in various factories, oil containing water in the floors of various factories, and oils that floated on the water surface ( The present invention relates to an oil-water adsorbent for efficiently treating an oil film), and an oil (emulsion) present in a dispersed state in water, a water purification agent using the same, and a method for treating the oil.

  Oil and water that leaks around the machine room of yachts and ships (including fishing boats) and bilge (seawater containing oil collected on the bottom of the ship) are pumped out periodically and discharged outside the ship. This water-containing oil and bilge cause environmental pollution. In addition, oil containing moisture (such as seawater) leaks out from a ship landing site such as a yacht or a ship (including a fishing boat), which causes environmental pollution of the ship landing site.

  Oils containing water splashed around the machine and on the floor in various factories, oils (oil film) that exist in a floating state on the water surface, oils (emulsion) that exist in a dispersed state in water, etc. And water are mixed together, the processing is extremely troublesome even if handled with considerable care.

  In addition, oil that has been accidentally spilled at gasoline stations, airfields, military bases, etc. that handle fuels such as gasoline, light oil, kerosene, and jet fuel can be mixed into rainwater ponds, sewage, and wastewater even if handled with great care. Most of the water diffuses and floats on the surface of the water and forms a thin oil film, or the oil is dispersed in water (emulsion state) and then flows out, and then natural waters such as rivers, lakes, and seas. The problem of flowing into the environment or deteriorating the natural environment arises.

  In addition, oil containing water scattered around machines and floors in various factories, etc., can be mixed in rainwater ponds, sewage, and wastewater even if handled with considerable care, and most of them diffuse and float on the water surface. The problem is that a thin oil film is formed in the wet state, the oil component (emulsion) that is dispersed in water flows out, and then flows into natural water areas such as rivers, lakes, and seas, and the natural environment is deteriorated. Occurs.

  Conventionally, means for removing the oil film on the water surface have been researched and developed (for example, Patent Documents 1 to 5).

JP-A-8-182929 Japanese Utility Model Publication No. 6-85035 JP-A-6-170359 JP 2002-346380 A JP 2004-131855 A

  The oil film removing means described in these Patent Documents 1 to 5 uses a mat or sheet that adsorbs oil on the water surface, but it takes time to adsorb oil by the mat or sheet, In order to remove the oil film spread over a wide range, it is necessary to lay a considerable number of mats and sheets, and there is a problem that a great deal of cost and labor are required.

  By the way, as a material capable of adsorbing and removing impurities in water, activated carbon is generally used because it is the simplest and most efficient.

  Activated carbon uses wood, sawdust, wood distillate, charcoal, coconut shell, lignin, etc. as raw materials (activated carbon raw material), and is heated and carbonized to increase its adsorption capacity for gases and pigments. Because of its relatively high and low-cost adsorption capacity for odorous components such as life odors and adsorbed components such as formalin, ethylbenzene or xylene such as VOC gas that cause sick house, water purification, refrigerators, etc. It is most widely used in the field of deodorizers for clogs or air purifier filters and other deodorant / adsorption products.

  Since activated carbon immediately after heating and carbonization treatment has a relatively low specific gravity, it can float on water. Therefore, if a large amount of such activated carbon is sprayed on the water surface on which an oil film is formed, the oil is adsorbed. It becomes possible to purify the water quality.

  However, the adsorption characteristics by activated carbon have priority over adsorption to moisture over adsorption to oil, so when activated carbon is sprayed on the water surface, it absorbs moisture in a short period of time, resulting in an increase in specific gravity and Since it sinks below the surface of the water, the oil adsorption efficiency is very poor, and it is also necessary to recover the activated carbon that has submerged under the surface of the water while adsorbing the oil, resulting in great inconvenience.

  Therefore, in order to solve the above problems, the present inventor has previously developed an adsorbed charcoal obtained by using coconut mesocarp as a raw material and subjecting it to heating and carbonization (see Patent Document 6 below). ).

JP 2007-15907 A

  That is, this adsorbed charcoal is characterized by the use of coconut mesocarp as its raw material. In other words, coconut mesocarp (raw material) has innumerable pores adjacent to each other by forming a complex network structure in which independent pores or independent pores and continuous pores are integrated on the surface or inside thereof. It focuses on the formation of a honeycomb structure, and if this coconut mesocarp is heated and carbonized, adsorbed charcoal with an infinite number of adjacent pores becomes adsorbed, so wood, sawdust It becomes a carbonized material (adsorbed charcoal) with a specific gravity smaller than that of conventional activated carbon made from wood dry distillate, charcoal, coconut husk or lignin, etc. Then, even if some moisture is absorbed, it continues to float on the water surface and can be brought into contact with the oil film on the water surface for a long period of time.

  Adsorbed charcoal obtained using coconut mesocarp as a raw material has a complex honeycomb structure in which independent holes and independent holes and continuous holes are integrated, so the size of each pore is very wide. Since it has a simple structure, it has excellent adsorptivity to all kinds of oils.

  However, most of the oil contained in natural water areas such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage, and rainwater ponds, etc. exists in a floating state on the water surface. Some oil components are present in a state emulsified in water (emulsion state), so even if the adsorbed charcoal is sprayed on the water surface, it is difficult to adsorb the oil components that are dispersed in the water. Met.

  Also, oil containing water leaking around the machine room of ships such as yachts and ships (including fishing boats), and oil around the docks are present in an emulsified state (emulsion state) in water such as seawater. Therefore, as in the case described above, even if the adsorbed charcoal is sprayed on the water surface, it is difficult to adsorb the oil component dispersed and present in the water.

  In particular, oil or the like that accumulates on the bottom of the ship, commonly referred to as “bilge”, is often present in an emulsified state in water such as seawater, and this can be efficiently adsorbed and removed only by the adsorbed charcoal. It was difficult.

  On the other hand, the emission standards of this bilge are becoming stricter due to the problem of marine pollution, and the emission standards are strictly controlled with an oil concentration of 15 ppm or less. Therefore, the development of efficient bilge removal means is strongly desired. Yes.

  Therefore, as a result of intensive studies by the inventor in order to solve the technical problem, adsorbed charcoal and water absorption formed by using coconut mesocarp as a raw material, and heating and carbonizing the raw material. The present inventors have developed the oil-water adsorbent of the present invention, which is characterized by comprising an organic polymer substance.

  In other words, in addition to adsorbed charcoal that has an excellent adsorptive power for oil, if a water-absorbing polymer that swells quickly by absorbing water is used in combination, the water-absorbing polymer absorbs moisture present around the oil. Therefore, the contact opportunity between the oil component dispersed in water and the adsorbed charcoal can be increased, and the knowledge that the oil component can be treated more efficiently has been obtained.

  The present invention has been completed on the basis of the above knowledge, and oil and bilge containing water leaking around the machine room of a ship such as a yacht or a ship (including a fishing boat), and further water leaking to the dock (seawater Etc.), oil containing water around machines in various factories, oil containing water on the floors of various factories, etc., oil components (oil film) that are floating on the surface of the water, and especially dispersed in water It is an object of the present invention to provide a novel oil / water adsorbent for efficiently treating the oil (emulsion) present in the water, a water purification agent using the same, and a method for treating the oil.

In order to achieve the above-mentioned object, the oil / water adsorbent according to the present invention includes oil containing water (seawater etc.) leaked around the machine room of the ship and the dock, etc., bilge (seawater containing oil collected on the bottom of the ship), various factories To absorb oil that contains moisture leaked around the machine and floors of various factories, oil that is floating on the surface of water (oil film), and oil that is dispersed in water (emulsion) An oil-water adsorbent, characterized in that the oil-water adsorbent is composed of adsorbed charcoal and water-absorbing polymer material formed by using coconut mesocarp as a raw material, and heating and carbonizing the raw material. It is what.
Hereinafter, first, the oil-water adsorbent of the present invention will be described in more detail, and then the water purification agent and the method for treating oil content of the present invention will be described in detail.

  The oil-water adsorbent of the present invention comprises “adsorbed charcoal” obtained by using coconut mesocarp as a raw material, and heating and carbonizing the raw material, and “water-absorbing polymer substance” described later.

  Here, the coconut palm has a three-layer structure of “endosperm” arranged at the center, “endocarp (palm gall)” consisting of a hard shell that wraps the outside, and “mesocarp” surrounding the inner pericarp. The endosperm is mainly used for food, and the inner pericarp (coconut shell) is used as a raw material for coconut shell activated carbon.

  On the other hand, the mesocarp is being discarded with almost no use other than the fiber component.

  However, when the present inventors diligently studied the use of this coconut mesocarp, the coconut mesocarp has a complex honeycomb structure in which independent holes and independent holes and continuous holes are integrated, Heating and carbonizing the coconut mesocarp makes it possible to obtain adsorbed charcoal with a complex honeycomb structure. This adsorbed charcoal is made from wood, sawdust, wood dry distillate, charcoal, coconut shell or lignin. It became clear that it becomes a carbonized substance (adsorbed charcoal) with a smaller specific gravity than the conventional activated carbon.

  And if the adsorbed charcoal using coconut mesocarp as a raw material is sprayed on the surface of the water, it will float on the surface of the water even if it absorbs some water, and it will contact the oil (oil film) on the surface for a long period of time. It will be possible to continue. As a result, this adsorbed charcoal can adsorb and remove the aforementioned oil (oil film) efficiently.

  In addition, as described above, the adsorbed charcoal obtained using coconut mesocarp as a raw material has a complicated honeycomb structure in which independent holes and independent holes and continuous holes are integrated. The structure has a very wide range of sizes, so that it has excellent adsorptivity for all kinds of oils.

  Moreover, as mentioned above, coconut mesocarp has almost no utility other than fiber components and is almost never used, so it can be procured at extremely low cost. There is also a great advantage from the viewpoint of waste utilization.

  In addition, the coconut mesocarp contains a fiber component, and in the adsorbed charcoal used in the present invention, the mesocarp that contains the fiber component may be heated and carbonized. However, if the adsorbent charcoal contains a large amount of fiber components, the specific gravity of the adsorbed charcoal as a whole will increase, so in the present invention, in particular, coconut mesocarp, with the fiber components further removed, is used as a raw material. It is preferable to use it.

  Here, in the present invention, “heating and carbonizing” refers to a process of heating and carbonizing the raw material (coconut mesocarp), and the processing temperature in this heating and carbonization is as follows. The temperature is not particularly limited as long as the raw material can be carbonized, but in the case of the present invention, the temperature is preferably in the range of 350 to 850 ° C. Insufficient oil (oil film) adsorptivity is poor. On the other hand, if the temperature exceeds 850 ° C., the honeycomb structure described above may be destroyed, and it is not preferable from the viewpoint of energy saving.

  In addition, it is attached to the adsorbed charcoal used in the present invention, and for the purpose of further increasing the adsorption capacity, the raw material (coconut peel) is heated, carbonized and activated, or the raw material (coconut peel) ) Is preferably subjected to an activation treatment after heating and carbonization treatment.

  This activation treatment is the same as the treatment for increasing the adsorption capacity performed during the production of ordinary activated carbon, and is roughly divided into two types, a “gas activation method” and a “chemical activation method”.

  The former gas activation method is a general method often used industrially, and in the case of the present invention, the adsorbed charcoal described above is further in an atmosphere of water vapor, carbon dioxide, etc., particularly at a temperature of about 650 to 850 degrees. It is the method of processing with.

  On the other hand, in the case of the present invention, the latter chemical activation method is a method of impregnating the above-mentioned adsorbed charcoal with a treatment solution such as an aqueous zinc chloride solution, and in particular, performing carbonization and activation all at once under a temperature condition of about 350 to 700 ° C. It is.

  That is, in the present invention, which activation treatment is used is not particularly limited, but it has been found that by setting the activation treatment temperature slightly lower than usual, the adsorptive power to oil increases. Therefore, in the present invention, the activation treatment is preferably performed at a relatively low temperature of about 350 to 750 ° C, more preferably about 400 to 750 ° C.

  As described above, when the adsorbed charcoal is processed at a relatively low temperature, the adsorption capacity increases. When the adsorbed charcoal is processed at a relatively low temperature, the honeycomb structure of the raw material (coconut peel) remains as it is. On the other hand, it is understood that the above-described honeycomb structure may be destroyed when the high temperature treatment is performed.

  The oil-water adsorbent of the present invention has the greatest feature in that a water-absorbing polymer substance is used in combination with the adsorbed charcoal.

  That is, in the oil-water adsorbent of the present invention, in addition to the adsorbed charcoal having an excellent adsorbing power for oil, a water-absorbing polymer substance that rapidly absorbs water and swells is used in combination. The molecular substance can absorb the moisture present around the oil component, which can increase the chance of contact between the oil component dispersed in the water and the adsorbed charcoal. It becomes possible to process efficiently.

  Here, the “water-absorbing polymer substance” is not particularly limited as long as it is a polymer material that smoothly absorbs water and gels by absorbing a large amount of water, and a known hydrophilic polymer material is used. Specific examples include, but are not limited to, synthetic high molecular weight hydrophilic polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid and salts thereof, and maleic anhydride copolymers, dextrin, pullulan, gelatin, and the like. Natural hydrophilic polymers, alginic acid and salts thereof, semisynthetic hydrophilic polymers such as methylcellulose, ethylcellulose, carboxymethylcellulose, etc., and in the present invention, these are selected from these water-absorbing polymer substances. Species or two or more water-absorbing polymers can be appropriately selected and used. Flip and may or treated them with surfactants, than in combination with these and surfactants may be or to increase hydrophilicity.

  In the present invention, the blending ratio of the adsorbed charcoal and the water-absorbing polymer substance is not particularly limited, but usually, the water-absorbing polymer substance 1 with respect to 100 parts by weight of the adsorbed charcoal. It is preferable that the amount of the water-absorbing polymer substance is less than 1% by weight, and sufficient adsorption treatment of the oil (emulsion) dispersed in water / seawater is preferable. On the other hand, when the amount exceeds 100 parts by weight, excessive amounts of moisture are absorbed and recovery and processing become difficult, and in either case, it is not preferable. Therefore, from these viewpoints, the mixing ratio of the adsorbed charcoal and the water-absorbing polymer substance is in the range of about 2.5 to 50 parts by weight with respect to 100 parts by weight of adsorbing charcoal. It is more preferable that the water-absorbing polymer substance is in the range of about 3.5 to 30 parts by weight.

  By the way, the oil-water adsorbent of the present invention may be used as it is, that is, in a powder state, but in order to facilitate the subsequent recovery / regeneration work, it is in the form of pellets such as granules, plates and disks. It is preferable to mold it into an arbitrary shape such as a tablet shape or a tablet shape, or to enclose them in a water-permeable bag material, or to fabric such as non-woven fabric or craft cloth, cotton, and textile products such as felt, porous A foam or a porous foam sheet may be used as a support, dispersed or supported on the support, or included in a fiber network.

  In the water purification agent of the present invention, the oil-water adsorbent of the present invention is used as a main component, and when configured in this way, due to the synergistic effect of the adsorbed charcoal and the water-absorbing polymer substance, In particular, oil and bilge (water containing oil accumulated at the bottom of the ship), yachts and ships (including fishing boats), etc., including water leaking around the machine room of ships such as yachts and ships (including fishing boats). Oil containing water leaked to the dock (seawater, etc.), oil containing water around the machinery in various factories, oil containing water in the floors of various factories, oil (oil film) present in a floating state on the water surface, and The oil (emulsion) present in the dispersed state in water can be processed efficiently. As a result, it is possible to improve the environmental sanitation in the ship and various factories, and improve and improve the natural environment at the dock. Can Than is.

  In addition, when sprayed on natural waters such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage, and rainwater reservoirs, the oil floats on the water surface (oil film) as a result of floating on the water surface for a long period of time. ) And the water purification agent are kept in contact with each other over a long period of time, so that the oil (oil film) can be efficiently removed, and the water-absorbing polymer substance absorbs the emulsion (emulsion). As a result, it is possible to increase the chance of contact between the oil component dispersed and the adsorbed charcoal, and the oil component can be further efficiently processed.

  Here, “main component” means that when the oil / water adsorbent of the present invention is used as a water purification agent, the water / water adsorbent has only the oil / water adsorbent, as well as the water / water adsorbent. Other dispersants or adsorbents may be blended at a rate that does not impair the oil adsorbing action, etc., and other dispersants or adsorbents include commonly used cotton and cotton fibers or Plant fiber such as coconut fiber or coconut fiber powder, animal fiber such as wool or powder thereof, semi-synthetic fiber such as acetate artificial fiber or powder thereof, regenerated fiber such as rayon or powder thereof, activated carbon And zeolite. Of these, various fibers and powders thereof, such as dispersants, in particular, various fiber components not only have water absorption, but also prevent water-absorbing polymer substances from adsorbing and swelling water to prevent dripping. desirable.

  In this case, generally, the blending ratio of the oil / water adsorbent according to the present invention with respect to the entire water purification agent is preferably about 60% by weight or more, and in particular, the water purification agent is produced only with the oil / water adsorbent. Is most desirable.

  The method for treating oil according to the present invention uses the water purification agent of the present invention, and this water purification agent is contaminated with oil, specifically, for example, oil or bilge containing moisture leaked into the ship, Furthermore, in a state of floating on the surface of the water using methods such as spraying, laying or as an oil fence on parts such as oil containing water leaked to the dock (seawater etc.), oil containing water scattered in various factories, etc. The oil component (oil film) that exists and the oil component (emulsion) that exists particularly in a dispersed state in water can be efficiently treated.

  In addition, in natural water areas such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage, and rainwater basins, not only oil (oil film) that floats on the surface of water by the same treatment method. In addition, oil (emulsion) present in water can also be efficiently removed.

  This makes it possible to efficiently adsorb and remove oil such as bilge that has been emulsified in water such as seawater, which could not be achieved by conventional methods.

  The present invention has the above-described configuration, not only oil and bilge containing moisture leaked into the ship, oil containing moisture leaked to the dock (seawater etc.), oil containing moisture scattered in various factories, etc. Oil (oil film) that is contained in natural waters such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage, and rainwater ponds, floating on the surface of the water, and dispersed in water It is an oil-water adsorbent that can efficiently remove the oil present.

  That is, in the oil-water adsorbent of the present invention, in addition to the adsorbed charcoal of the present invention having an excellent adsorbing power for oil, a water-absorbing polymer substance that rapidly absorbs water and swells is used in combination. The water-absorbing polymer substance can absorb the water present around the oil component, and as a result, it is possible to increase the chance of contact between the oil component (emulsion) dispersed in water and the adsorbed charcoal. Can be processed more efficiently.

  Further, the water purification agent of the present invention is characterized by comprising the oil-water adsorbent of the present invention as a main component, and oil or bilge containing moisture leaked into the ship, moisture leaked into the dock (seawater In addition to oil containing water scattered in various factories, as well as in natural waters such as rivers, lakes, and seas, wastewater such as factory wastewater, sewage and rainwater reservoirs, etc. When used as an oil fence or the like, the oil (oil film) floating on the water surface and the water purification agent remain in contact for a long time as a result of floating on the water surface for a long period of time. It can be removed well, and since the water-absorbing polymer absorbs the water present around the oil, the opportunity for contact between the oil present dispersed in the water and the adsorbed charcoal can be increased. Oil (emma Including John.) Is becoming more can be processed more efficiently.

Furthermore, in the oil content processing method of the present invention, the water purification agent of the present invention is used to remove the oil film floating on the water surface and the oil content dispersed and present in water, When the oil content treatment method of the present invention is applied to the presence (oil film) location of the oil component floating on the water surface and the oil content location existing in an emulsified state in water, the oil content (oil film) floating on the water surface for a long period of time. ), And the oil present in the emulsified state in water can be treated more efficiently.

  As a result, it is possible to efficiently adsorb and remove oil present in an emulsified state in water such as seawater or fresh water, which could not be achieved by the conventional method.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be specifically described below, but the present invention is not limited to the following examples.

<Adsorbed charcoal>
Wash the coconut skin with water, dry the fiber component to some extent, heat it at a temperature of about 550 ° C, and in a reddish state, steam, carbon dioxide (CO ₂ in the combustion gas) and oxygen (combustion) Adsorbed carbon powder was obtained by heating and carbonizing at a temperature of about 600 ° C. in a mixed atmosphere of O ₂ ) in the air.

<Water-absorbing polymer substance>
Polyvinyl alcohol powder in a dry state was used as the water-absorbing polymer substance.

  By mixing 50 parts by weight of adsorbed charcoal, 2.5 parts by weight of a water-absorbing polymer substance, 15 parts by weight of cotton, 22.5 parts by weight of coconut fibers, and 10 parts by weight of coconut fiber powder, An adsorbent was obtained.

  13 parts by weight of this oil / water adsorbent is wrapped in a cotton fiber mesh bag, and further encapsulated in a bag material (16 cm × 20 cm rectangle) made of a heat-sealable non-woven fabric. Obtained.

Comparative Example 1

A mixture of 52.5 parts by weight of the adsorbed charcoal, 15 parts by weight of cotton as a dispersant, 22.5 parts by weight of coconut fibers and 10 parts by weight of powder of coconut fibers (oil-water adsorbent) is made of cotton fiber. This was wrapped in a net bag and further sealed in a bag material (16 cm × 20 cm rectangle) made of a heat-sealable nonwoven fabric to obtain a water purification agent.
That is, in this comparative example, the water-absorbing polymer substance was not used.

<Comparison test>
200 parts by weight of seawater was mixed with 1 part by weight of engine oil, and further 1 part by weight of a neutral detergent was added, and then 100 ml of an emulsified solution (emulsion) prepared artificially by stirring sufficiently was put in two containers.
Subsequently, the water purifiers obtained in Example 1 and Comparative Example 1 were respectively added and allowed to stand overnight.

  After a day and night, when each container was confirmed, the one in which the water purification agent of Example 1 was introduced absorbed almost all of the oil in the container, but the one in which the water purification agent according to the comparative example was introduced, A considerable amount of oil remained in the container.

  Moreover, it was confirmed that when the water purification agent of Example 1 was adsorbed with oil and water and then taken out from the container, dripping did not occur so much, and this was naturally dried and solidified. Later, when it ignited, it was found that it burned completely. During this combustion, no generation of harmful gas was observed.

  On the other hand, oil moisture was adsorbed to the water purification agent of Comparative Example 1 and then removed from the container. As a result, it was confirmed that a large amount of liquid sagging was generated from the water purification agent (bag material), and there was a risk of recontamination. Was observed to occur.

Claims (12)

  Oil containing moisture (seawater, etc.) leaked around the ship's machine room or at the dock, etc., bilge (seawater containing oil collected at the bottom of the ship), oil containing moisture leaked around the machinery in various factories and on the floors of various factories An oil / water adsorbent for adsorbing oil (oil film) that exists in a floating state on the water surface and oil (emulsion) that is dispersed in water. An oil-water adsorbent comprising an adsorbed charcoal formed by using a peel as a raw material, and heating and carbonizing the raw material and a water-absorbing polymer substance.   The oil-and-water adsorbent according to claim 1, wherein a raw material obtained by removing a fiber component from coconut husk as a raw material is used.   The oil-water adsorbent according to claim 1 or 2, wherein the raw material is heated and carbonized in a treatment temperature range of 350 to 850 ° C.   The oil-water adsorbent according to any one of claims 1 to 3, wherein an activation treatment is performed together with heating and carbonization treatment.   The oil-water adsorbent according to any one of claims 1 to 3, wherein an activation treatment is performed after the heating and carbonization treatment.   The oil-water adsorbent according to claim 4 or 5, wherein a treatment temperature in the activation treatment is in a range of 350 to 850 ° C.   An oil-water adsorbent in which the oil-water adsorbent according to any one of claims 1 to 6 is formed into an arbitrary shape such as a granular shape, a pellet shape, a tablet shape, or a tablet shape.   The oil-water adsorbent according to any one of claims 1 to 7, further comprising plant fibers such as cotton or cotton fibers or powder thereof, coconut fibers or coconut fiber powder, or animal fibers such as wool. An oil-water adsorbent in which a dispersing agent such as powder, semi-synthetic fiber such as artificial fiber of acetate, powder thereof, regenerated fiber such as rayon, powder thereof, or the like is blended.   An oil-water adsorbent in which the oil-water adsorbent according to any one of claims 1 to 8 is supported on a cloth, a felt, a porous foam, or a porous foam sheet.   An oil-water adsorbent in which the oil-water adsorbent according to any one of claims 1 to 8 is accommodated in a porous bag.   A water purification agent comprising the oil / water adsorbent according to any one of claims 1 to 10 as a main component.   A method for treating an oil component, comprising treating an oil component existing on the water surface and in water using the water purification agent according to claim 11.