JP2018149514A - Oil and fat-containing wastewater treatment apparatus and oil and fat-containing wastewater treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suitably separate and remove oil and fat components from oil and fat-containing wastewater and decompose oil and fat in an apparatus.SOLUTION: An oil and fat-containing wastewater treatment apparatus 100 has a plurality of oil and fat treatment tanks 1,2 into which added is a support 11,21 with oil and fat decomposing bacteria fixed thereto, and a control part 3 that selects an oil and fat treatment tank to which the oil and fat-containing wastewater is introduced, from the plurality of oil and fat treatment tanks 1,2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil and fat-containing wastewater treatment apparatus and an oil and fat-containing wastewater treatment system.

  It is known that fats and oils are difficult to biodegrade in wastewater treatment. For this reason, for example, Patent Document 1 discloses a method of treating separated water after the oil and fat is adsorbed to the adsorbent from the oil and fat-containing wastewater in the acid generation tank and separated and removed.

JP2015-112532A

  However, the method described in Patent Document 1 cannot secure the time required for decomposing the oil / fat adsorbed by the adsorbent, which may result in insufficient decomposition of the oil / fat. If a new oil / fat-containing wastewater is introduced in a state where the oil / fat is not sufficiently decomposed, the oil / fat separation / removal itself may be insufficient.

  The present invention has been made in view of the above, and includes an oil and fat-containing wastewater treatment apparatus and an oil and fat-containing wastewater treatment system capable of suitably separating and removing oil and fat components from oil and fat-containing wastewater and decomposing oil and fat in the apparatus. The purpose is to provide.

  In order to achieve the above object, an oil and fat-containing wastewater treatment apparatus according to an embodiment of the present invention includes a plurality of oil and fat treatment tanks into which a carrier to which fat and oil degrading bacteria are fixed is added, and the plurality of oil and fat treatment tanks. And a control unit that selects an oil / fat treatment tank into which the oil / fat-containing wastewater is introduced.

  According to the oil and fat-containing wastewater treatment apparatus, the oil and fat-containing wastewater is introduced into the oil and fat treatment tank in which the carrier to which the oil-degrading bacteria are fixed is added, so that the oil and fat components are separated from the oil and fat-containing wastewater. Removal is preferably performed. Moreover, since the fat-and-oil processing tank which introduces fat-and-oil containing waste water from several oil-and-fat processing tanks is selected by the control part, about the fat-and-oil processing tank which was not selected, the time slot | zone when fat-and-oil containing waste water is not introduced is provided. In the time zone when the oil-containing wastewater is not introduced, the oil / fat component is not newly added to the oil / fat treatment tank, and the oil / fat component is decomposed by the oil-degrading bacteria in the tank. As a result, the oil and fat component is suitably decomposed in the tank. Thus, according to the fat and oil-containing wastewater treatment apparatus, it is possible to suitably separate and remove the fat and oil components from the fat and oil-containing wastewater and to decompose the fat and oil in the apparatus.

  Here, the plurality of oil treatment tanks may be provided independently of each other. By having such a configuration, each of the plurality of oil processing tanks can be individually manufactured. For example, the oil processing tank can be easily manufactured and transported in a place different from the planned installation site of the apparatus. .

  Moreover, the said several fats-and-oils processing tank can be set as the aspect provided by dividing the inside of one tank. By setting it as such a structure, a some fats-and-oils processing tank can be arrange | positioned more compactly.

  Moreover, the pipe | tube which introduce | transduces the said fat-and-oil containing waste_water | drain with respect to the said fats and oils processing tank can be made into the aspect connected with the lower part of the said fats and oils processing tank.

  By setting it as such a structure, contact with fat-and-oil containing waste water and the support | carrier in an oil-treatment tank is accelerated | stimulated, and adsorption | suction of the fat-and-oil component with respect to a support | carrier is performed more suitably.

  Moreover, the oil-containing wastewater treatment system according to an aspect of the present invention includes the oil-containing wastewater from a plurality of oil-treating tanks in which a carrier to which oil-degrading bacteria are fixed is added, and the plurality of oil-treating tanks. A control unit that selects an oil / fat treatment tank for introducing the oil, a reaction tank that is provided in a subsequent stage of the plurality of oil / fat treatment tanks and that performs biological treatment by introducing water from the plurality of oil / fat treatment tanks, and the reaction A return unit that returns the water containing the fat and oil component from the tank, and a return water control unit that returns the water containing the fat and oil component returned by the return unit to one of the plurality of oil processing tanks. .

  According to the above oil-containing wastewater treatment system, the oil-and-fat-containing wastewater is introduced into the oil-and-fat treatment tank in which the carrier on which the fat-and-oil-decomposing bacteria are fixed is added. Removal is preferably performed. Moreover, since the fat-and-oil processing tank which introduces fat-and-oil containing waste water from several oil-and-fat processing tanks is selected by the control part, about the fat-and-oil processing tank which was not selected, the time slot | zone when fat-and-oil containing waste water is not introduced is provided. In the time zone when the oil-containing wastewater is not introduced, the oil / fat component is not newly added to the oil / fat treatment tank, and the oil / fat component is decomposed by the oil-degrading bacteria in the tank. As a result, the oil and fat component is suitably decomposed in the tank. Thus, according to the fat and oil-containing wastewater treatment apparatus, it is possible to suitably separate and remove the fat and oil components from the fat and oil-containing wastewater and to decompose the fat and oil in the apparatus. Furthermore, water containing the fat and oil component returned from the reaction tank by the return unit is introduced into one of the plurality of oil processing tanks by the control of the return water control unit. Therefore, the removal of the fat and oil component is not complete, and even if the fat and oil component flows into the subsequent reaction tank, the fat and oil component is prevented from flowing out into the latter stage of the reaction tank and the time required for biological treatment in the reaction tank. Can be prevented from increasing.

  According to the present invention, there are provided an oil and fat-containing wastewater treatment apparatus and an oil and fat-containing wastewater treatment system capable of suitably separating and removing oil and fat components from oil and fat-containing wastewater and decomposing oil and fat in the apparatus.

It is a figure explaining the fat and oil containing waste water treatment equipment concerning one embodiment of the present invention. It is a figure explaining the fat and oil containing waste water treatment system which concerns on one Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic diagram illustrating the configuration of an oil-and-fat-containing wastewater treatment apparatus according to an embodiment of the present invention. The fat and oil containing wastewater treatment apparatus 100 introduces water to be treated which is fat and oil containing wastewater introduced from the outside, and separates and removes fats and oils from the fat and oil containing wastewater, and the fat and oil treatment tanks 1 and 2. And a control unit 3 that controls the introduction of the water to be treated. In addition, the oil and fat-containing wastewater treatment apparatus 100 discharges treated water from the lines L1, L2, and L3, which are pipes for introducing treated water into the oil and fat treatment tanks 1 and 2, and the oil and fat treatment tank 1. Line L4, which is a pipe, and line L5, which is a pipe for discharging treated water from the oil processing tank 2. Further, a three-way valve V is provided at the connection portion of the lines L1, L2, and L3.

  In addition, although this embodiment demonstrates the case where the fat-and-oils containing wastewater treatment apparatus 100 has the two fat processing tanks 1 and 2, the structure which has three or more fat processing tanks may be sufficient. In the fat and oil-containing wastewater treatment apparatus, a line for introducing the water to be treated and a line for discharging the treated water are provided for each of the plurality of fat and oil treatment tanks. And the control part 3 performs control which introduces to-be-processed water with respect to the fats-and-oils processing tank of some (one or more, but not all) among several oil-and-fat processing tanks.

  The fat and oil treatment tank 1 is introduced with a carrier 11 on which fat and oil degrading bacteria are fixed. As the carrier 11, for example, activated carbon or a functional carrier can be used. The functional carrier in the present embodiment is a carrier composed of a material having oil and fat adsorptivity. Examples of the material having oil and fat adsorptivity include polymer materials. The shape of the carrier 11 is not particularly limited as long as the oil-degrading bacteria can be fixed, and may be any shape such as a cube, a rectangular parallelepiped, a column, a cylinder, a string, and a plane.

  The oil-degrading bacteria attached to the carrier 11 can be selected from bacteria having oil-degradability. Examples of these oil-degrading bacteria include Acinetobacter, Aeromonas, Anaerolinacea, Anaerosinus, Aspergillus, Bacillus, Burkholderia, Candida, Desulfovibrio, Geotrichum, Propionispora, Pseudoaltermonas, Pseudomonas, Psychrobactr, Synocrobusr, tropococcus Can be mentioned. One or more bacteria are selected from the above oil-degrading bacteria and attached to the carrier 11. The oil and fat treatment tank 1 may also serve as an acid production tank that decomposes organic substances with acid producing bacteria (mainly anaerobic acid producing bacteria) housed therein to produce lower fatty acids. When the oil / fat treatment tank 1 has a function as an acid generation tank, an anaerobic oil-degrading bacterium can be used. The oil processing tank 2 has the same configuration as that of the oil processing tank 1, and a carrier 21 in which oil decomposing bacteria are fixed is introduced.

  The line L1 is a pipe that introduces the water to be treated into the fat and oil treatment tanks 1 and 2, and the line L2 and the fat and oil treatment tank 2 that introduce the water to be treated into the fat and oil treatment tank 1 at the subsequent stage of the line L1. A line L3 for introducing the water to be treated is provided. The three-way valve V has a function of branching the water to be treated from the line L1 into the lines L2 and L3. Moreover, the control part 3 controls introduction of the to-be-processed water with respect to the fats and oils processing tanks 1 and 2 by controlling the three-way valve V.

  The line L2 is connected to the lower part of the oil processing tank 1. The water to be treated introduced into the oil / fat treatment tank 1 moves upward in the oil / fat treatment tank 1. In that case, the fat component contained in to-be-processed water adheres to the support | carrier 11 by contacting with the support | carrier 11, and is isolate | separated from to-be-processed water. The treated water from which the fats and oils have been separated is discharged out of the system from the line L4 at the top of the fat and oil treatment tank 1. The oil and fat component adhering to the carrier 11 is decomposed by the oil-degrading bacteria fixed to the carrier 11. After being decomposed into the lower fatty acid from the oil and fat component by the oil and fat decomposing bacteria, it is discharged from the line L4 together with the treated water.

  In the oil processing tank 2, the same processing as that in the oil processing tank 1 is performed. That is, the water to be treated introduced from the line L3 to the oil treatment tank 2 contacts the carrier 21 while moving upward in the oil treatment tank 2, so that the oil and fat component contained in the water to be treated is supported by the carrier 21. And is separated from the water to be treated. The treated water from which the fats and oils have been separated is discharged out of the system from the line L5 at the top of the fat and oil treatment tank 2. The oil and fat component adhering to the carrier 21 is decomposed by the oil-degrading bacteria fixed on the carrier 21.

  Here, the control part 3 selects the tank which introduces to-be-processed water from the fats and oils processing tanks 1 and 2, and performs switching control of the three-way valve V so that to-be-processed water may be introduced into either. The control by the control unit 3 can be configured to switch the tank into which the water to be treated is introduced at a predetermined interval (several hours), for example. In addition, a configuration in which the state of water in the oil treatment tanks 1 and 2 (for example, turbidity) is measured by a sensor or the like, and the control unit 3 switches the tank into which the water to be treated is introduced based on the result. Good. Thus, the method by which the control part 3 switches the tank which introduces to-be-processed water can be set suitably. When it has two oil-fat treatment tanks 1 and 2, the control part 3 performs control which introduces to-be-processed water with respect to two tanks alternately.

  As a result of the control by the control unit 3, the water to be treated is introduced into one of the oil processing tanks 1 and 2, and the water to be treated is not introduced into the other tank. The same applies to the case of having three or more oil / fat treatment tanks, and the control unit 3 performs control to select a tank into which the water to be treated is introduced so that the time during which the water to be treated is not introduced is provided in each tank. The oil / fat treatment tank into which the water to be treated is not introduced is in a state where water is stored in the tank until the water to be treated is introduced again.

  As described above, the oil-and-fat-containing wastewater treatment apparatus 100 according to the present embodiment has a plurality of oil-and-fat treatment tanks (in this embodiment, the oil-and-fat treatment tanks 1 and 2) and introduces water to be treated by the control unit 3. The tank is selected and introduced. As a result, each oil / fat treatment tank is provided with a time during which water to be treated is not introduced. By having such a configuration, it is possible to suitably perform the separation and removal of fats and oils from the water to be treated and the decomposition of fats and oils in the apparatus, particularly in the fat and oil treatment tank.

  Conventionally, methods for removing fat and oil components from fat and oil-containing wastewater using fat and oil adsorbents and the like have been studied. However, sufficient examination has not been made on how to treat the fat and oil components adsorbed on the fat and oil adsorbent. About this point, it is thought as one proposal to decompose | disassemble an oil-fat component using fat-oil decomposition bacteria like the oil-fat treatment tanks 1 and 2 of this embodiment. However, it is known that the decomposition rate of fats and oils is slower than the decomposition rate of other organic substances, and in particular, it takes time for β-oxidation. Therefore, even if the oil and fat component is decomposed by the oil and fat decomposing bacteria in the oil and fat treatment tank, the treated water may be discharged in a state where the undecomposed oil and fat component remains.

  On the other hand, in the fat-and-oil containing waste water treatment apparatus 100 which concerns on this embodiment, the control part 3 provides the time zone when to-be-processed water is not introduce | transduced about each of the some oil-fat treatment tanks 1 and 2. FIG. In the time zone when the water to be treated is not introduced, the oil / fat component is not newly added to the oil / fat treatment tank, and the oil / fat component is decomposed by the oil-degrading bacteria in the tank. As a result, the oil and fat component is suitably decomposed in the tank. Moreover, in the normal structure in which to-be-processed water is introduce | transduced continuously, the easily decomposable substance (for example, protein or sugar etc.) contained in to-be-processed water other than an oil-and-fat component always exists in a tank. In this case, since the number of bacteria that decompose easily decomposable substances different from the oil-degrading bacteria also increases in the tank, there is a possibility that the oil and fat decomposition may not be suitably performed. However, when the time zone in which the water to be treated is introduced and the time zone in which the water to be treated is alternately repeated, in the oil treatment tanks 1 and 2, the time zone in which the water to be treated is not introduced is other than the fat component. Since the concentration of the easily degradable substance is reduced, the oil-degrading bacteria are likely to selectively grow compared to other bacteria. Therefore, in the oil processing tanks 1 and 2, the state in which the oil-degrading bacteria are superior to other bacteria is maintained. Therefore, the removal of the fat and oil component from the water to be treated using the fat and oil treatment tanks 1 and 2 and the decomposition of the fat and oil component in the tank are suitably performed.

  Moreover, in the said embodiment, line L2, L3 which introduces to-be-processed water is connected to the lower part of the fats-and-oils processing tank 1,2. By setting it as such a structure, a contact with to-be-processed water and the support | carriers 11 and 21 is accelerated | stimulated, and adsorption | suction of an oil-fat component is performed more suitably. Even if the line for introducing the water to be treated is connected to the upper part of the oil / fat treatment tank, the water to be treated and the carrier are in contact with each other in the tank. Done properly.

  Moreover, when it is set as the structure which introduces to-be-processed water alternately with respect to several fats-and-oils processing tanks 1 and 2, like the oil-and-fat containing waste water treatment apparatus 100 which concerns on this embodiment, in each fat-and-oil processing tank, to-be-processed If separation / removal of oil / fat components from water and decomposition of oil / fat components can be suitably performed, each oil / fat treatment tank can be downsized. If the oil processing tank can be reduced in size, for example, the area necessary for installing the oil processing tank can be reduced. Moreover, when a fat and oil processing tank is large, it is necessary to manufacture a processing tank in an installation planned site, and the work amount in an installation planned site increases. On the other hand, if the processing tank can be downsized, for example, a manufactured processing tank can be transported to the planned installation site, and the amount of work at the planned installation site can be reduced.

  In addition, although FIG. 1 demonstrates the case where the two fat processing tanks 1 and 2 are provided separately (independently), this structure can be changed suitably. For example, a plurality of oil processing tanks may be formed by partitioning one tank into a plurality of partitions. Thus, if it is set as the structure which forms a some oil-fat processing tank by dividing one tank, a some oil-fat processing tank can be arrange | positioned more compactly. On the other hand, when the two oil processing tanks 1 and 2 are individually provided, each of the oil processing tanks 1 and 2 can be manufactured individually, for example, in a place different from the installation site of the apparatus. The oil processing tank can be easily manufactured and transported.

  Next, an oil and fat containing wastewater treatment system including the oil and fat containing wastewater treatment apparatus 100 will be described with reference to FIG. FIG. 2 is a schematic diagram showing a configuration of an oil-and-fat-containing wastewater treatment system 200 according to an embodiment of the present invention.

  The fat and oil-containing wastewater treatment system 200 includes an oil and fat-containing wastewater treatment device 100 and a reaction tank that introduces water discharged from the fat and oil-containing wastewater treatment device 100 and performs biological treatment. In the oil-and-fat-containing wastewater treatment system 200 described in the present embodiment, the case where the reaction tank is the anaerobic treatment tank 4 and the organic matter is decomposed by methane fermentation will be described.

  In the anaerobic treatment tank 4, a granular sludge layer 41 in which anaerobic bacteria suitable for anaerobic treatment are present is formed. And if the water from the line L4 of the upper part of the fat processing tank 1 or the line L5 of the upper part of the fat processing tank 2 is introduced into the anaerobic processing tank 4, it will be contained in the granular sludge layer 41 of the anaerobic processing tank 4. Methane fermented by anaerobic bacteria. As a result, in the anaerobic treatment tank 4, a gas mainly composed of methane and carbon dioxide is generated and treated water is generated. Inside the anaerobic treatment tank 4, a settler 42 that is a gas-solid-liquid separator may be provided. The gas generated in the anaerobic treatment tank 4 is released outside the system (not shown). Moreover, the treated water produced | generated in the anaerobic processing tank 4 is discharged | emitted out of the system through the line L6. The anaerobic treatment tank 4 may be of any type such as EGSB (Expanded Granular Sludge Bed), UASB (Upflow Anaerobic Sludge Blanket), anaerobic treatment using a carrier or membrane separation.

  The anaerobic treatment tank 4 is provided with a return unit 7 for returning water containing the fat component to the fat treatment tanks 1 and 2. The return unit 7 includes, above the anaerobic treatment tank 4, a recovery unit 71 that recovers water containing oil and fat components, and a line L 7 that returns the water recovered by the recovery unit 71. In the anaerobic treatment tank 4, water that has been subjected to the treatment related to separation and removal of the fat and oil components in either of the fat and oil treatment tanks 1 and 2 is introduced, but the water in which the fat and oil components have not been completely removed is removed. There is a possibility of being introduced into the anaerobic treatment tank 4. In that case, the oil and fat component moves upward from the water layer and stays there. The collection unit 71 collects water containing the oil and fat component that stays above the anaerobic treatment tank 4. Although the method in which the collection | recovery part 71 collect | recovers the water containing an oil-fat component is not specifically limited, For example, the method of attracting | sucking the water of the area | region where an oil-fat component stays is mentioned. The amount of water containing the fat and oil component collected by the collecting unit 71 is appropriately set based on the amount of the fat and oil component staying above the anaerobic treatment tank 4.

  The water containing the fat and oil component recovered by the recovery unit 71 is returned through the line L7. The returned water containing the oil / fat component is introduced into one of the oil / fat treatment tanks 1 and 2. The return of the water containing the oil / fat component to either of the oil / fat treatment tanks 1 and 2 is controlled by the return water control unit. In the oil-and-fat-containing wastewater treatment system 200 of the present embodiment, an example is shown in which a line L7 is provided so as to join the line L1 on the upstream side of the three-way valve V. In addition, in the oil-and-fat-containing wastewater treatment system 200, the control unit 3 also functions as a return water control unit and controls the three-way valve V, thereby controlling the introduction of treated water into the oil and fat treatment tanks 1 and 2, The example which performs simultaneously control of the introduction to the fats and oils processing tanks 1 and 2 containing the fat and oil component returned by the return part 7 is shown.

  In addition, about introduction to the fats and oils processing tanks 1 and 2 containing the fats and oils component returned by the return part 7, it uses as a structure controlled separately from to-be-processed water using piping different from to-be-processed water. Also good. Moreover, when setting it as such a structure, you may provide the return water control part separately from the control part 3. FIG.

  When the water containing the fat and oil component returned by the return unit 7 is introduced into the fat and oil treatment tanks 1 and 2 independently of the water to be treated, the fat and oil treatment tank (which is different from the oil and fat treatment tank into which the water to be treated is introduced ( It can be set as the structure introduced with respect to the fats-and-oils processing tank of the state in which the to-be-processed water is not introduced. As described above, the oil and fat component is decomposed in the oil and fat treatment tank during a time period when the water to be treated is not introduced. If it is set as the structure which introduce | transduces the water containing an oil and fat component in the tank of such a state, decomposition | disassembly of an oil and fat component will be performed suitably. However, it is good also as a structure which introduces the water containing the fat and oil component returned by the return part 7 with respect to the same tank as to-be-processed water similarly to this embodiment. In this case, the oil and fat component contained in the water returned by the return unit 7 adheres to the carrier 11, and then the oil and fat component is decomposed by the oil and fat decomposing bacteria.

  In addition, when the pipe | tube which introduces the water containing an oil and fat component is provided separately from the pipe of to-be-processed water, and controls each separately, the pipe | tube which introduces the water containing an oil and fat component is connected to the lower part of the fat and oil treatment tanks 1 and 2 By setting it as a structure, the contact with the water containing fats and oils and the support | carriers 11 and 21 is accelerated | stimulated, and adsorption | suction of fats and oils components is performed more suitably.

  In the oil and fat-containing wastewater treatment system 200 described above, the control unit 3 provides a time zone during which the water to be treated is not introduced for each of the plurality of oil and fat treatment tanks 1 and 2. Therefore, the oil and fat component is suitably decomposed in the tank. In addition, since the time zone in which the water to be treated is introduced and the time zone in which the water to be treated is introduced are alternately repeated, the state in which the oil-degrading bacteria are dominant over other bacteria in the oil-treatment tank 1. Maintained. Therefore, the removal of the fat and oil component from the water to be treated using the fat and oil treatment tanks 1 and 2 and the decomposition of the fat and oil component in the tank are suitably performed.

  Moreover, in the fat and oil containing wastewater treatment system 200, the biological treatment of the water from the fat and oil treatment tanks 1 and 2 is performed in the anaerobic treatment tank 4 subsequent to the fat and oil treatment tanks 1 and 2. Here, the return part 7 which returns the water containing fat and oil component to the fat and oil treatment tanks 1 and 2 is provided, and the water containing the fat and oil components is provided by the control part 3 functioning as a return water control part. Returned to one of the following. Therefore, the removal of the fat and oil component is not complete, and even if the fat and oil component flows into the anaerobic treatment tank 4 in the subsequent stage, the return portion 7 collects and returns the water containing the fat and oil component and anaerobic. It is possible to prevent the oil and fat component from flowing out to the subsequent stage of the anaerobic treatment tank 4 and to prevent the time required for biological treatment in the anaerobic treatment tank 4 from increasing.

  In addition, although this embodiment demonstrated the case where the reaction tank of the back | latter stage of the fats and oils processing tanks 1 and 2 is an anaerobic process tank, even if it performs an aerobic process instead of an anaerobic process in the latter reaction tank. Good. Regardless of whether the biological treatment performed in the subsequent reaction tank is an anaerobic treatment or an aerobic treatment, the fat and oil components are separated and removed in the previous fat and oil treatment tank. Compared with the case of decomposing components, it is possible to shorten the time required for decomposing organic substances and to prevent the time required for biological treatment from becoming longer.

  In addition, when anaerobic treatment is performed in a reaction tank as in this embodiment, there are various introduction merits such as the absence of aeration power and the generation of excess sludge, while the anaerobic treatment can decompose oil and fat components. It is known to take time. Therefore, when it is set as the structure which provides the reaction tank which performs anaerobic processing in the back | latter stage of the fats and oils processing tanks 1 and 2 like the fat and oil containing wastewater treatment system 200 of this embodiment, the fats and oils processing tanks 1 and 2 are provided and the fat and oil component It is considered that the effect of shortening the decomposition time in the reaction tank by separating and removing the slag in the previous stage becomes larger.

  As mentioned above, although one form of this invention was demonstrated, this invention is not limited to the said embodiment, A various deformation | transformation aspect is possible. For example, the type of each tank is not particularly limited, and can take various forms.

  In addition, a pretreatment tank or the like may be provided between the oil treatment tanks 1 and 2 or between the oil treatment tanks 1 and 2 and the reaction tank (anaerobic treatment tank 4).

  DESCRIPTION OF SYMBOLS 1, 2 ... Oil treatment tank, 3 ... Control part, 4 ... Anaerobic treatment tank, 7 ... Return part, 11, 21 ... Carrier, 100 ... Oil and fat containing waste water treatment apparatus, 200 ... Oil and fat containing waste water treatment system.

Claims (5)

A plurality of oil treatment tanks in which a carrier to which oil-degrading bacteria are fixed is added;
A control unit for selecting an oil / fat treatment tank for introducing the oil / fat-containing wastewater from the plurality of oil / fat treatment tanks;
An oil-containing wastewater treatment apparatus having   The fat and oil-containing wastewater treatment apparatus according to claim 1, wherein the plurality of fat and oil treatment tanks are provided independently of each other.   The fat and oil-containing wastewater treatment apparatus according to claim 1, wherein the plurality of fat and oil treatment tanks are provided by dividing an inside of one tank.   The oil-and-fat-containing wastewater treatment apparatus according to any one of claims 1 to 3, wherein a pipe that introduces the oil-and-fat-containing wastewater into the oil-and-fat treatment tank is connected to a lower portion of the oil-and-fat treatment tank. A plurality of oil treatment tanks in which a carrier to which oil-degrading bacteria are fixed is added;
A control unit for selecting an oil / fat treatment tank for introducing the oil / fat-containing wastewater from the plurality of oil / fat treatment tanks;
A reaction tank that is provided in a subsequent stage of the plurality of oil treatment tanks and performs biological treatment by introducing water from the plurality of oil treatment tanks;
From the reaction tank, a return unit for returning water containing fat and oil components,
A water return control unit that returns water containing the oil and fat component returned by the return unit to any of the plurality of oil processing tanks;
An oil and fat-containing wastewater treatment system.

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