JP2007268509A - Foreign matter separation method and foreign matter separation apparatus for separating foreign matter having mainly oil from oil-containing sewage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a case that no sufficient treatment for respective oil characteristics is carried out at the time of carrying out separation treatment for oil-containing sewage since a water discharge port and a floating oil discharge port are fixed in a floating oil separation tank where the water discharge port is set lower than the floating oil discharge port because of the specific gravity difference of the floating oil and water and a problem that although the oil in the periphery of the floating oil discharge port is constantly discharged and flows out, the oil in the periphery of the boundary between the oil and water is stagnated for a long time and sometimes becomes rotten and obsolete since the positions of the water discharge port and the floating oil discharge port are fixed. <P>SOLUTION: At the time of separating oil and water on the basis of difference of specific gravity of oil and water, the discharge face x where oil floats is set at a position higher than the discharge face y of water and the height of the discharge face x of the oil or the height of the discharge face y of water are made changeable to make it possible to discharge various types of oils. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a foreign matter separation method and a foreign matter separation device for separating foreign matter mainly oil from sewage containing oil, and more specifically, utilizing the fact that the specific gravity of oil and water is different. In the separation tank that separates oil and water, the oil discharge surface where the oil floats is positioned higher than the water discharge surface, so that oil and water can be discharged so that various oil discharges can be handled. This is a technique related to a foreign matter separation device that separates foreign matter centered on oil from sewage containing oil that is provided with a movable oil tube and a movable water tube that can change the surface difference.

  As a conventional technology related to a foreign matter separation device that separates foreign matters mainly oil from sewage containing oil, those constituting a gas-liquid separation tank, a floating oil separation tank, a dispersed oil separation tank, and an emulsified oil treatment tank (See, for example, Patent Document 1).

In this case, Patent Document 1 discloses a gas-liquid separation tank that separates gas-liquid from the pumped drain water, drain water that has flowed in from above is separated into floating oil and moisture, and a water outlet is defined as floating oil. A floating oil separation tank that is lower than the floating oil outlet due to a difference in specific gravity with moisture, a dispersion oil separation tank that separates and adsorbs a dispersion oil having a relatively large particle size contained in drain water, It describes whether a technique for forming an emulsified oil treatment tank in which an emulsified oil separator is filled on the inlet side and an emulsified oil adsorbent is filled on the outlet side is described.
JP 5-184810

  However, the conventional foreign matter separating apparatus for separating foreign matter mainly oil from such sewage containing oil has the following problems.

  First, a floating oil separation tank is constructed in which the moisture outlet is lower than the floating oil outlet due to the difference in specific gravity between the floating oil and the water, but the positions of the moisture outlet and the floating oil outlet are Since it was fixed, there was a case where it was not possible to sufficiently cope with the characteristics of each oil when separating the sewage containing oil.

  In particular, when there is a difference in viscosity, sometimes when the viscosity varies depending on the season, when the viscosity is low, the oil level is located at the margin of the floating oil outlet, but when the viscosity is high, it is raised and positioned higher If the boundary between oil and water is high in viscosity, the height of the portion that occupies the oil changes greatly, so the balance between the overall height of the tank and the height of the portion that occupies the oil However, there was a desire to change the height difference between the water outlet and the floating oil outlet, but this was not possible.

  In addition, because the positions of the water outlet and the floating oil outlet are fixed, the oil around the floating oil outlet always flows out and flows, but the oil around the boundary between the oil and water is long-term. There was a problem of stagnation and, in some cases, corrosion and obsolescence.

  Furthermore, regarding the configuration of the emulsified oil treatment tank in which the emulsified oil separator is filled on the inlet side and the emulsified oil adsorbent is filled on the outlet side, the order of filling the emulsified oil separator and the emulsified oil adsorbent may be sometimes mistaken. In that case, the function of the emulsified oil treatment was hardly exhibited.

  The present invention relates to a foreign matter separation method for separating foreign matter, mainly oil, from sewage containing oil, and when oil and water are separated by utilizing the fact that the specific gravity of oil and water is different, The oil discharge surface x is positioned higher than the water discharge surface y, and the height of the oil discharge surface x or the water discharge surface is set so that various oil discharges can be handled. It is characterized in that the height of y can be changed, and furthermore, in the foreign matter separation method for separating foreign matter, mainly oil, from sewage containing oil, the fact that the specific gravity of oil and water is different is used. When separating the oil and water, the oil discharge surface x on which the oil is floating is positioned higher than the water discharge surface y, so that the oil can be used for various oil discharges. The height of the discharge surface x and the height of the water discharge surface y can be changed. Separating by utilizing different things, characterized in that a plurality of times, even, by characterized by adsorbing the oil at least one location, it was the above-mentioned problems are eliminated.

  Further, the present invention provides a separation apparatus for separating oil and water by utilizing the fact that the specific gravity of oil and water is different in a foreign matter separation apparatus that separates foreign matter mainly oil from wastewater containing oil. In addition, the oil discharge surface x where the oil is floating is positioned higher than the water discharge surface y, and the height of the oil discharge surface x is changed so that various oil discharges can be handled. The movable oil cylinder 42 constituting the oil discharge part 40 to be made is disposed on the upper part of the fixed oil receiver 41a forming the oil receiver 41 constituting the oil discharge part 40, and the separation tanks 20, 50 are arranged. The bottom water is discharged through the water level forming portions 21bb and 52 of the water discharge portions 21b and 52 located on the water discharge surface y, and further, from the sewage containing oil In a foreign matter separation device that separates foreign matter, mainly oil, it is beneficial that the specific gravity of oil and water be different. Then, in the separation tank 50 for separating oil and water, the oil discharge surface x where the oil is floating is positioned higher than the water discharge surface y, and the oil discharge located on the oil discharge surface x A water discharge pipe 51c is provided for the moving water pipe 52 of the water discharge part 52 that is provided with a part 40 and that can change the height of the water discharge surface y so that it can cope with various oil discharges. The water level forming part 52 of the water discharge part 52 is arranged on the upper part of the vertical part 51cb and the water at the bottom of the separation tank 50 is located on the water discharge surface y via the water discharge pipe 51c. In addition, the oil floating on the oil discharge surface x is fed into the upper portion of the oil discharge portion 40 disposed in the separation tanks 20 and 50. In order not to be disturbed by sewage containing oil and to be easily fed into the oil discharge part 40, A trainer unit 55 and a fence 56 are provided. Furthermore, the separation tank 50 receives a primary tank 51r containing the oil discharge part 40 and water at the bottom of the primary tank 51r by a moving pipe 51b. The secondary tank 51s is formed, oil and water are separated by utilizing the fact that the specific gravity of oil and water is different in both the primary tank 51r and the secondary tank 51s, and the oil is supplied to the secondary tank 51s. An oil adsorbing material 57 that adsorbs water is housed, and further, a metal mesh 58 is provided so that the oil adsorbing material 57 does not block the water discharge pipe 51c connected to the water discharge portion 52. By solving the above-mentioned problems, the above-mentioned problems have been solved.

  As is clear from the above description, the present invention can provide the following effects.

  First, when separating oil and water using the difference in specific gravity between oil and water, the oil discharge surface where the oil is floating is positioned higher than the water discharge surface. By changing the height of the oil discharge surface or the height of the water discharge surface so that it can cope with the discharge of water, it can be used for oil characteristics such as specific gravity and viscosity, It has become easier to respond to fluctuations and associated changes in temperature.

  Secondly, in this case, by changing the height of the oil discharge surface and the height of the water discharge surface, if there is a difference in viscosity, sometimes the viscosity varies depending on the season, if the viscosity is low In this case, the oil surface is located at the very end of the oil discharge surface, but if the viscosity is high, it will rise and be located high.As a result, if the boundary surface between oil and water is high, Since the height of the oil-occupying part varies greatly, when considering the balance between the overall tank height and the oil-occupying part, both the water discharge surface and the oil discharge surface are high. I wanted to change the difference, but it became possible.

  Third, especially by making it possible to change the height of the oil discharge surface or the height of the water discharge surface, temporarily reduce the difference between the oil and water discharge surfaces as necessary. As a result, since most of the oil can be discharged, it becomes easy to discharge the oil at the boundary surface between the water and the oil that stays and becomes obsolete for a long time.

  Fourthly, it is possible to change the height of the water discharge surface to discharge clean water from which foreign substances have been removed, unlike when changing the height of the dirty oil discharge surface. It is possible to easily operate the moving water bottle because it does not get dirty, and other parts and equipment do not interfere with the surroundings.

  Fifth, separation by utilizing the fact that the specific gravity is different was performed a plurality of times, so that it was possible to reliably perform separation even for sewage containing oil with a severe degree of contamination.

  Sixth, it has become possible to cope with emulsified oil by adsorbing oil at least at any location. In addition, by providing a wire mesh, the water discharge pipe can be prevented from being clogged with the oil adsorbing material.

  Seventh, the oil that floats on the oil discharge surface above the oil discharge section disposed in the separation tank is not disturbed by the sewage containing the sent oil and is easily sent to the oil discharge section. By providing the strainer part and the fence, the oil after separation can be discharged smoothly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a plan view showing the separation tank of the present invention and its surroundings, FIG. 2 is a sectional view from the front showing the separation tank of the present invention and its surroundings, and FIG. FIG. 4 is a plan view showing another separation tank of the present invention and its surroundings, and FIG. 4 is a sectional view from the front showing another separation tank of the present invention and its surroundings.

  In general, sewage containing oil is used in machinery factories that use water that has been used to clean containers that used to contain oil or equipment that used oil, or that uses cutting oil or cooling water. Wastewater generated, drain water from compressed air, water pumped up due to some trouble in the sea or river, wastewater from factories and grocery stores that use foods that use oil Various kinds of things can be seen.

  In this case, when the generated sewage is discarded, various regulations are imposed by various laws and regulations. Therefore, when trying to dispose of sewage containing oil, first separate only foreign substances, mainly oil, from the sewage to be discarded as much as possible, while clean water is discharged into rivers etc. Ideally, reduce the amount of waste and dispose of only the remaining foreign matter, mainly oil, as industrial waste. Hereinafter, various methods and apparatuses for separating foreign matters centered on oil from sewage containing oil will be described.

[First embodiment]
As can be seen in FIGS. 1 and 2, reference numeral 20 denotes a separation tank, which separates foreign matter mainly from oil and water by utilizing the fact that the specific gravity of oil and water is different. Accordingly, the foreign matter centered on the oil floating up by separation is stored in the oil storage tank 30, and the relatively clean water from which the oil staying at the bottom is removed is stored in the water storage tank 60. Are arranged as follows.

  In this case, the separation tank 20 includes a separation tank body 21, an oil discharge part 40, a joint 27, and an on-off valve 24. And the separation tank main body 21 can separate and discharge | release oil and water by flowing in the waste water containing oil, floating the foreign material centering on oil, and storing water heavier than oil in a bottom part. The main body 21a is integrally formed with a sewage inflow pipe 25 that allows sewage to flow in and a water discharge pipe 21b that is a water discharge part 21b that discharges relatively clean water from which oil staying at the bottom is removed. Forming. By the way, regarding the sewage inflow pipe 25 and the water discharge part 21b, it is conceivable that both are integrally fixed to the main body 21a by welding or brazing, or connected by a joint.

  In addition, the water discharge pipe 21b which is the water discharge part 21b is formed in a water level which is positioned vertically and is positioned on the water discharge surface y and is horizontal, with the introduction part 21ba extending to the vicinity of the bottom part. The water level forming part 21bb which is formed on the water discharge surface y from the one end of the introduction part 21ba is formed by the part 21bb and the discharge part 21bc which discharges the water and retains the clean water staying at the bottom. It arrange | positions so that it may discharge | emit from discharge part 21bc via. It should be noted that the portion where the introduction portion 21ba is extended and connected to the water level forming portion 21bb is always opened to the atmosphere so that water and oil in the separation tank body 21 do not flow out by the principle of siphon. It is done.

  And while the joint 27 is located on the side surface of the main body 21a, the oil discharge part 40 constituted by the oil receiver 41 and the moving oil cylinder 42 integrally formed by the fixed oil receiver 41a and the oil discharge pipe 41b is provided. The inner portion of the joint 27 and the oil discharge pipe 41b are connected and fixed integrally. That is, the oil discharge part 40 is fixed and housed integrally with the main body 21 a inside the separation tank main body 21 through the joint 27. On the other hand, an on-off valve 24 that can be manually opened and closed is connected and fixed to the outer portion of the joint 27 so that the oil accumulated in the oil receiver 41 can be discharged as needed.

  By the way, the moving oil cylinder 42 is disposed on the upper part of the fixed oil receiver 41a forming the oil receiver 41 so as to be movable in the vertical direction, and the upper end of the moving oil cylinder 42 is moved. Is always the oil discharge surface x, and therefore the oil discharge surface x is movable.

  The structure of the moving oil cylinder 42 and the fixed oil receiver 41a is both cylindrical, and the moving oil cylinder 42 is positioned inside the fixed oil receiver 41a, and both are screwed, that is, the fixed oil receiver 41a. The moving oil cylinder 42 is formed with a female screw and can be moved up and down by rotating.

  However, although it does not change by screwing, it is also conceivable to place the moving oil cylinder 42 outside the fixed oil receiver 41a. In addition, the movable oil cylinder 42 is positioned on the inner side of the fixed oil receiver 41a, instead of being moved up and down by screwing, either inside the fixed oil receiver 41a or outside the movable oil cylinder 42. On the other hand, it is possible to attach a thin rubber so that it can move up and down and prevent it from falling naturally, and the bent material can be returned to its original state by using the action of a leaf spring. It is also conceivable to use the force to try to keep it falling naturally.

  In this case, the fact that the movable oil cylinder 42 is movable means that a water level is formed as a part of the water discharge pipe 21b by the water discharge pipe 21b that is integrally formed with the main body 21a as the separation tank main body 21 and is thus fixed. Since the part 21bb coincides with the water discharge surface y, the oil discharge surface x that can move to a position higher than the position with respect to the water discharge surface y at the fixed position exists. This means that the value of the difference A between the oil and water discharge surfaces can be freely changed and finally fixed at a desired position. Then, a relationship is established between the difference A between the oil and water discharge surfaces, the oil height B from the water discharge surface, and the specific gravity of the oil, which is a fixed value by finally fixing. The value of the oil height B from the water discharge surface is determined, and it can be said that the value of “A + B” that is the oil height from the oil discharge surface x to the boundary surface between the oil and water can be determined. It is.

  Therefore, when the floating oil is stored in the oil receiver 41 beyond the moving oil cylinder 42 which is the oil discharge surface x, and the oil stored in the oil receiver 41 is accumulated to some extent, the on-off valve 24 is opened. The stored oil can be sent to the oil storage tank 30 from the joint 27 via the on-off valve 24.

  The foreign matter separation method and foreign matter separation device for separating foreign matter centered on oil from sewage containing oil according to the present invention are configured as described above, and the contents thereof will be described below.

  First, the oil discharge surface x is set to a position higher than the water discharge surface y by adjusting the height of the moving oil cylinder 42 in accordance with the specific gravity of the oil that is considered to be contained in the sewage. The sewage containing is fed into the separation tank 20 from the sewage inflow pipe 25. Therefore, the sewage containing the fed oil causes foreign matters centered on the oil to float, and relatively clean water heavier than the oil stays at the bottom of the separation tank 20. As the amount of inflow of sewage containing oil increases with time, the upper oil level also rises and reaches the upper end of the moving oil cylinder 42.

  Therefore, the oil that has reached the upper end of the moving oil cylinder 42 passes over the upper end of the moving oil cylinder 42 and flows into the oil receiver 41. In addition, since the oil discharge pipe 41b which forms the oil receiver 41 is connected to the joint 27 and the on-off valve 24, the inflowed oil is stored in the oil storage tank 30 when the on-off valve 24 is opened. If the on-off valve 24 is closed, it is stored in the oil receiver 41.

  Further, relatively clean water staying at the bottom of the separation tank 20 flows from one end of the introduction portion 21ba forming the water discharge pipe 21b, which is the water discharge portion 21b, and further It discharges | emits via the water level formation part 21bb and the discharge part 21bc which are located in the discharge surface y.

  In this case, considering that oil and water are respectively discharged from the oil discharge surface x and the water discharge surface y, the following [Equation 1] is provided between the oil discharge surface x and the water discharge surface y. The following formula holds.

  Therefore, the following [Equation 2] is established by this [Equation 1].

  As a result, assuming that the specific gravity of the oil is 0.85, the ratio of A: B is 3:17, which is natural. If the position of the oil discharge surface x from which the oil is discharged is also set to the position of “A” higher than the water discharge surface y from which the water is discharged, the position of the oil is discharged according to the above-described ratio relationship. The value of “B”, which is the height of oil from the discharge surface of the oil, is also determined, and the position of “A + B”, which is the height of oil from the oil discharge surface x to the boundary surface between water and oil, is determined. is there.

  In this way, the water discharge surface y, the oil discharge surface x, and the specific gravity of the oil are determined, and “A + B as the oil height from the oil discharge surface x to the boundary surface that is the boundary between water and oil is determined. By fixing the position of “”, the boundary surface is fixed. As a result, the overflowing water and oil are discharged from the water discharge surface y and the oil discharge surface x.

  The purpose of enabling the oil discharge surface x to be moved by the moving oil cylinder 42 is when the position of the moving oil cylinder 42 of “A”, which is the position as the difference between the oil and water discharge surfaces, is fixed. In other words, only the oil that has always reached the periphery of the upper end of the moving oil cylinder 42 passes over the moving oil cylinder 42 and flows into the oil receiver 41. On the other hand, of the sewage that has flowed into the separation tank 20, the oil level from the oil discharge surface x can be maintained by trying to keep it stationary because it has the purpose of separating oil and water. The oil in the vicinity of the boundary surface between the oil and water in which A is located at “A + B” always stays in the vicinity and stagnates.

  Therefore, in order to prevent such corruption, if the value of “A”, which is the difference between the oil and water discharge surfaces, is extremely decreased by moving the position of the moving oil cylinder 42 from time to time, The value of “B”, which is the height of the oil, is also reduced, and as a result, the oil that has been kneaded can be discharged considerably. In particular, when there is a difference in viscosity, sometimes the viscosity varies depending on the season, and when the viscosity is low, the oil level is located at the edge of the oil discharge surface x, but when the viscosity is high, it rises. Since the height of the portion where the boundary between oil and water occupies the oil changes greatly, the height of the entire separation tank 20 and the height of the portion occupying the oil among them When considering the balance with “A + B”, there was a desire to change the difference in height between the water discharge surface y and the oil discharge surface x.

[Second Example]
As shown in FIGS. 3 and 4, reference numeral 50 denotes a separation tank, which separates foreign matter mainly from oil and water by utilizing the fact that the specific gravity of oil and water is different. Therefore, as in the first embodiment, the foreign matter centered on the oil that floated by separation is stored in the oil storage tank 30, and the relatively clean water from which the oil staying at the bottom is removed is stored in the water. It arrange | positions so that each may be stored in the tank 60. FIG.

  In this case, the separation tank 50 includes a separation tank body 51, an oil discharge part 40, a joint 27, an on-off valve 24, a joint 53, a sewage inflow pipe 54, a strainer part 55, an oil adsorbent 57, a wire mesh 58, and a water discharge part 52. A moving water bottle 52 is used.

  And the separation tank main body 51 can separate and discharge | emit oil and water by making the sewage containing oil flow in, floating the foreign material centering on oil, and stagnating water heavier than oil in a bottom part. In order to be able to move, the main tank 51a formed with the primary tank 51r, the secondary tank 51s, and the tertiary tank 51t moves relatively clean water from which oil stayed at the bottom is removed from the primary tank 51r to the secondary tank 51s. The moving pipe 51b to be discharged, the water discharge pipe 51c that discharges the relatively clean water from which the oil staying at the bottom is removed from the secondary tank 51s and stores it in the tertiary tank 51t, and the tertiary tank 51t is relatively clean. A discharge outlet 51d that discharges fresh water is integrally formed. In this case, the separation is performed by utilizing the fact that the specific gravity of oil and water is different between the primary tank 51r and the secondary tank 51s. By the way, regarding the moving pipe 51b and the water discharge pipe 51c, it is conceivable that both of them are integrally fixed to the main body 51a by welding or brazing, or connected by a joint.

  The moving pipe 51b discharges water from the introduction pipe 51ba which is positioned vertically and extends to the vicinity of the bottom, the parallel section 51bb which is positioned below the water discharge surface y and is horizontal, and the water. It is possible to move relatively clean water, which is formed by the discharge portion 51bc and stays at the bottom portion, from one end portion of the introduction pipe 51ba from the discharge portion 51bc via the parallel portion 51bb.

  And, while the joint 27 is located on the side surface of the primary tank 51r forming the main body 51a, the oil receiver 41 and the moving oil cylinder 42 integrally formed by the fixed oil receiver 41a and the oil discharge pipe 41b. The configured oil discharge part 40 is housed in the primary tank 51r, and the inner part of the joint 27 and the oil discharge pipe 41b are connected and fixed integrally. That is, the oil discharge part 40 is fixed and accommodated integrally with the main body 51 a inside the separation tank main body 51 through the joint 27. On the other hand, an on-off valve 24 that can be manually opened and closed is connected and fixed to the outer portion of the joint 27 so that the oil accumulated in the oil receiver 41 can be discharged as needed.

  However, the details of the oil discharge unit 40 are described in the first embodiment, and the same contents are repeated, and thus the description thereof is omitted.

  By the way, the oil absorbing material 57 that adsorbs oil is accommodated in the secondary tank 51s. However, as the oil adsorbent 57, one or both of the adsorbent with broken particles and the adsorbent intended for adsorbing the oil, the emulsion to which the emulsion breaking particles intended to adsorb the oil by breaking the emulsion are adhered, In both cases, a uniform mixture is stored.

  In this case, the adsorbent with emulsion-breaking particles releases the oil-water bond by breaking the separated water, which is sometimes emulsified by the action of the emulsion-breaking particles. Is adsorbed on the adsorbent and adsorbent constituting the adsorbent with emulsion breaking particles. Therefore, when the adsorbent with emulsion breaking particles and the adsorbent are mixed, the oil is completely separated while releasing the binding of water by breaking the emulsion from the emulsified oil. It can be removed. As a matter of course, in the case of only the adsorbent, it functions only to adsorb oil.

  Here, as a method of making an adsorbent with emulsion breaking particles in which emulsion breaking particles are attached to an adsorbent, after a solution in which emulsion breaking particles such as amine and barium sulfate are dissolved in a solvent is attached to the adsorbent, A method of evaporating and drying the solvent is common, but there is also a method of spraying the solution onto the adsorbent in a mist form. Further, a method is also conceivable in which the emulsion breaking particles such as amine and barium sulfate are attached to the adsorbent in a state of being uniformly mixed in the liquid rather than being dissolved.

  In this case, the emulsion-breaking particles and the adsorbent may be filled so as to be dispersed between the adsorbents without changing the state of the emulsion-breaking particles and the adsorbent to the adsorbent with emulsion-breaking particles.

  On the other hand, with respect to the amine used in the present invention, an amine compound or a derivative thereof is conceivable. When the amine compound or the derivative thereof is 25 ° C., it is preferably solid, but the compound is 25 ° C. Sometimes it may be non-solid, or it may be a compound that becomes a solid in a mixture with other compounds. That is, the compounds may be used alone or in combination of two or more.

  By the way, these amine compounds and derivatives thereof are preferably primary amines, secondary amines, tertiary amines, and derivatives thereof, more preferably primary amines, secondary amines, and derivatives thereof, particularly preferably, Primary amines (eg stearylamine) and their derivatives.

  Examples of the amine compound include primary amines such as hexylamine, heptylamine, octylamine, nonylamine, decylamine, laurylamine, myristylamine, palmitylamine, oleylamine, stearylamine, or hydrocarbon chains thereof. Secondary amines such as diamines and triamines, and tertiary amines, or their picrates, various salts (for example, salts of hydrochloric acid, sulfuric acid, phosphoric acid, carbonic acid, acetic acid, etc.), and these hydrocarbon chains Examples include primary amines, secondary amine acid amides, amidines, ureas, thioureas, and primary amine Schiff bases.

  Moreover, what consists of fiber containing nonwoven fabrics, such as a polypropylene and a polystyrene, can be considered as an adsorbent used for the adsorbent and the adsorbent with emulsion breaking particles. However, the adsorbent used for the adsorbent and the adsorbent with emulsion breaking particles need not be limited to the above-mentioned one, and activated carbon and sawdust can be used if they have an oil adsorption function and are water-insoluble. It is possible to use other things.

  Then, fairly clean water treated by the oil adsorbent 57 stays at the bottom of the secondary tank 51s. In this case, the water discharge pipe 51c formed by the horizontal portion 51ca positioned horizontally and the vertical portion 51cb positioned vertically can send the water at the bottom of the secondary tank 51s to the tertiary tank 51t. , And fixed integrally at a location near the bottom of the secondary tank 51s. Therefore, one end of the water discharge pipe 51c is located near the bottom of the secondary tank 51s, and the other end is housed in the tertiary tank 51t.

  Note that a metal mesh 58 is disposed in the secondary tank 51s with a certain distance from the water discharge pipe 51c so that the oil adsorbing material 57 does not block the inlet which is one end of the water discharge pipe 51c. However, the shape of the wire mesh 58 is not necessarily limited to that shown in FIG. 4, and a hollow sphere portion made of wire mesh is located at one end of the water discharge pipe 51 c or made of wire mesh. A thing like the shape of a part of a cube is also conceivable.

  In this case, on the upper part of the vertical part 51cb forming the water discharge pipe 51c, a water discharge part 52 that is capable of moving in the vertical direction and simultaneously discharges water at the bottom is located. In addition, the water discharge part 52 which is this moving water cylinder 52 is also the water level formation part 52 located in the water discharge surface y simultaneously.

  By the way, it may be considered that the structure of the vertical part 51cb forming the moving water cylinder 52 and the water discharge pipe 51c is the same as the structure of the moving oil cylinder 42 and the fixed oil receiver 41a. Therefore, the description is omitted.

  Further, the fact that the movable water cylinder 52 is movable means that the value of the difference A between the oil and water discharge surfaces is changed and finally fixed at a desired position together with the movable oil cylinder 42 being movable. It means that it can be done. Then, a relationship is established between the difference A between the oil and water discharge surfaces, the oil height B from the water discharge surface, and the specific gravity of the oil, which is a fixed value by finally fixing. The value of the oil height B from the water discharge surface is determined, and it can be said that the value of “A + B” that is the oil height from the oil discharge surface x to the boundary surface between the oil and water can be determined. It is.

  Here, the water staying at the bottom of the secondary tank 51s discharged from the water discharge section 52 is temporarily stored in the tertiary tank 51t, and then the portion exceeding the drain outlet 51d is sent to the water storage tank 60. It is designed to be stored.

  3 and 4, the separation tank 50 includes a primary tank 51r, a secondary tank 51s, and a tertiary tank 51t. The oil discharge unit 40 is positioned in the primary tank 51r and the oil is contained in the secondary tank 51s. Although the adsorbent 57 is housed and the water discharge part 52 is positioned in the tertiary tank 51t, it is not necessary to be limited to this structure.

  Therefore, regarding the oil discharge part 40 of the primary tank 51r and the water discharge part 52 of the tertiary tank 51t, both may be configured to be movable, or only one of them may be configured to be movable. Further, the number of tanks is not limited to three, and may be one, two, four, or more. In that case, if the method of the water discharge part 21b used in the first embodiment is not used without using the method of the water discharge part 52 which also serves as the moving water cylinder 52, a tank for temporarily storing the water of the final tank is not necessary.

  Further, regarding the oil adsorbing material 57, it can be considered that it is stored in both the secondary tank and the tertiary tank as 4 tanks, and that it is stored in all of the secondary tank, the tertiary tank and the quaternary tank as 5 tanks. The same can be considered for 6 or more tanks. In addition, it is possible to combine the primary tank 51r and the secondary tank 51s as two tanks, collect them in one tank and store them in the first tank, and combine the primary tank 51r and the secondary tank 51s as three tanks. It is conceivable to consolidate in one tank and store it in that one tank and store it in the next one tank, and the same can be considered for four or more tanks.

  In particular, while the oil adsorbent 57 described so far is stored in a plurality of tanks, water is stored particularly in only one tank among a plurality of tanks or only in a part of the plurality of tanks. It can be stored immediately before the tank to be used, and it is very effective. Except for the first tank and the tank for storing the last water, it is necessary to take a method for discharging the floated oil to the tank that does not contain the oil adsorbent 57. Moreover, except the tank which stores the last water, other tanks aim at isolate | separating water and oil.

  Naturally, it is also conceivable to store the oil adsorbent 57 in the separation tank 20 of the first embodiment. In that case, it is natural to consider the wire mesh 58 including various contents for storing the oil adsorbent 57 described above.

  It should be noted that either one or both of the oil discharge unit 40 and the water discharge unit 52 described above can be moved, the number of tanks, the tanks in which the oil adsorbents 57 are stored, the oil adsorbents 57 Regarding the presence / absence of the tank that does not store the water, the presence / absence of the final tank that stores the water, and other contents, it is conceivable that the contents are combined and used.

  In addition, in the upper part of the oil discharge part 40 accommodated in the primary tank 51r forming the separation tank 50, the oil floating on the oil discharge surface x of the primary tank 51r is sent from the sewage inflow pipe 54. In order to prevent the sewage from being disturbed, a strainer 55a for separating foreign matter, a cover 55b for gently dropping sewage and an air nozzle 55c for ejecting air 99 are provided, and further this air is provided. A fence 56 is provided so that the oil floating on the oil discharge surface x by the nozzle 55c is easily sent to the oil discharge portion 40. In addition, regarding the shape of the fence 56, although it is a shape lacking a circle in FIG. 3, it may be v-shaped or its deformed shape.

  The foreign matter separation method and foreign matter separation device for separating foreign matter centered on oil from sewage containing oil according to the present invention are configured as described above, and the contents thereof will be described below.

  First, the oil discharge surface x is fixed at a position higher than the water discharge surface y by adjusting the moving oil cylinder 42 and the moving water cylinder 52 to be set at ideal positions, and the sewage containing the oil is discharged into the sewage inflow pipe. 54 is fed into the primary tank 51r of the separation tank 50. Therefore, the sewage containing the fed oil causes foreign matters centered on the oil to float up and retains relatively clean water heavier than the oil at the bottom. As the amount of inflow of sewage containing oil increases with time, the upper oil level also rises and reaches the upper end of the moving oil cylinder 42.

  In this case, the sewage containing oil is dripped gently into the primary tank 51r from the sewage inflow pipe 54 through the strainer 55a and the cover 55b, in particular through the cover 55b. At the same time, when compressed air is sent to the sewage inflow pipe 54 together with sewage, the sent compressed air is introduced into the air nozzle 55c, and then air 99 is discharged from the air nozzle 55c so as to float on the oil discharge surface x. It helps to send oil into the oil discharge section 40. In that case, if the fence 56 is installed around the oil discharge part 40, oil can be sent into the oil discharge part 40 still more easily.

  Therefore, the oil that has reached the upper end of the moving oil cylinder 42 passes over the upper end of the moving oil cylinder 42 and flows into the oil receiver 41. In addition, since the oil discharge pipe 41b which forms the oil receiver 41 is connected to the joint 27 and the on-off valve 24, the inflowed oil is stored in the oil storage tank 30 when the on-off valve 24 is opened. If the on-off valve 24 is closed, it is stored in the oil receiver 41.

  The relationship between the difference A between the oil and water discharge surfaces, the oil height B from the water discharge surface, and the specific gravity of the oil is the same as that described in the first embodiment. Omits the description of its contents.

  On the other hand, relatively clean water staying at the bottom of the primary tank 51r is fed into the secondary tank 51s through the introduction pipe 51b.

  In the secondary tank 51 s, the water that is first fed is mixed almost uniformly with both the adsorbent with emulsion breaking particles adhering the emulsion breaking particles and the adsorbing material that adsorbs oil as the oil adsorbent 57. Emulsion destruction by releasing the water-oil bond of the emulsified oil in the adsorbent with emulsion breaking particles by randomly passing through the adsorbent with emulsion breaking particles and the adsorbent in the stored state. In addition, the separated oil is adsorbed, the adsorbent adsorbs the oil that could not be adsorbed by the adsorbent with emulsion breaking particles, and this process is repeated many times to improve the cleanliness of water. After that, it is retained at the bottom of the secondary tank 51r. As a matter of course, in the secondary tank 51r, besides the oil adsorption by the oil adsorbing material 57, separation by the difference in specific gravity of oil and water is expected and the oil adsorbing material 57 is not accommodated. In some cases, the expectation is great.

  Note that the oil adsorbing material 57 contains small pieces of 2 mm × 200 mm or less, and concretely, as an example, one containing two types of 5 mm × 45 mm and 25 mm × 45 mm is conceivable. Since the wire mesh 58 is disposed between the position where the oil adsorbent 57 is stored and the inlet of the water discharge pipe 51c that discharges water at the bottom, the oil adsorbent 57 enters the water discharge pipe 51c. There is no worry to block.

  Finally, the water staying at the bottom of the secondary tank 51s is sent to the tertiary tank 51t via the water discharge pipe 51c and the water discharge part 52. And the water sent into the tertiary tank 51t will be stored in the water storage tank 60, if the water outlet 51d is exceeded.

  The present invention relates to a foreign matter separation method and a foreign matter separation device for separating foreign matter mainly oil from sewage containing oil, and in particular, contents that can be appropriately adjusted even when the kind of oil mixed as foreign matter changes from time to time. It has become.

  The top view which showed the separation tank of this invention and its circumference   Sectional view from the front showing the separation tank of the present invention and its surroundings   The top view which showed another separation tank of this invention, and its circumference | surroundings   Sectional view from the front showing another separation tank of the present invention and its surroundings

Explanation of symbols

20 .... Separation tank 21 .... Separation tank body 21a ... Main body 21b ... Water discharge pipe (water discharge part)
21ba ················································································································ 25 ·········· Oil storage tank 40 ·············································································································・ ・ ・ Moveable oil cylinder 50 ・ ・ ・ ・ ・ ・ Separation tank 51 ・ ・ ・ ・ ・ ・ Separation tank body 51a ・ ・ ・ ・ ・ Main body 51b ・ ・ ・ ・ ・ Moving pipe 51ba ・ ・ ・ Introduction pipe 51bb ・ ・··· Parallel portion 51bc ··· Discharge portion 51c ··· Water discharge pipe 51ca ··· Horizontal tube 51cb ··· Vertical portion 51d ··· Drain port 51r ··· Primary tank 51s ... Secondary tank 51t ... Tertiary tank 52 .... Moving water bottle (water level formation part, water discharge part)
53 ········································································································ 5 ······································································· Oil adsorbent 58 ················································ Air・ Difference between oil and water discharge surface B ... Oil height from water discharge surface x ... Oil discharge surface y ... Water discharge surface

Claims (9)

  In the foreign matter separation method that separates foreign matter, mainly oil, from sewage containing oil, the oil that floats when separating the oil and water using the difference in specific gravity of oil and water The discharge surface (x) of the oil is positioned higher than the discharge surface (y) of the water, and the height of the oil discharge surface (x) or the water is adjusted so as to correspond to various oil discharges. A foreign matter separation method for separating foreign matter centered on oil from sewage containing oil, wherein the height of the discharge surface (y) can be changed.   In the foreign matter separation method that separates foreign matter, mainly oil, from sewage containing oil, the oil that floats when separating the oil and water using the difference in specific gravity of oil and water The discharge surface (x) of the oil is positioned higher than the discharge surface (y) of the water, and the height of the oil discharge surface (x) is set so as to correspond to the discharge of various oils and the water. A foreign matter separation method for separating foreign matter centered on oil from sewage containing oil, wherein the height of the discharge surface (y) can be changed.   3. A foreign matter separation method for separating foreign matter centered on oil from sewage containing oil according to claim 1 or 2, wherein the separation is performed a plurality of times using the fact that the specific gravity is different.   4. The foreign matter separation method for separating foreign matter centered on oil from sewage containing oil according to any one of claims 1 to 3, wherein oil is adsorbed at least at any location.   In a foreign matter separation device that separates foreign matter, mainly oil, from sewage containing oil, a separation tank (20, 50) that separates oil and water by utilizing the difference in specific gravity between oil and water The oil discharge surface (x) where the oil floats is positioned higher than the water discharge surface (y) and the height of the oil discharge surface (x) is high so that various oil discharges can be handled. The fixed oil receiver (41a) that forms the oil receiver (41) that constitutes the oil discharge section (40) by the movable oil cylinder (42) that constitutes the oil discharge section (40) that can change the height The water level forming part (21bb, 52) of the water discharge part (21b, 52) located on the water discharge surface (y) is disposed at the top of the separation tank (20, 50). A foreign matter separating apparatus for separating foreign matter, mainly oil, from sewage containing oil, characterized by being discharged through.   In a foreign matter separator that separates foreign matter, mainly oil, from sewage containing oil, the oil floats in the separation tank (50) that separates oil and water by utilizing the difference in specific gravity between oil and water. The oil discharge surface (x) is positioned higher than the water discharge surface (y), and an oil discharge portion (40) positioned on the oil discharge surface (x) is disposed. The water discharge pipe (51c) is composed of the moving water cylinder (52) of the water discharge part (52) that allows the height of the water discharge surface (y) to be changed so that the oil can be discharged. The water which is disposed on the upper part of the vertical part (51cb) and is located on the water discharge surface (y) through the water discharge pipe (51c) for the water at the bottom of the separation tank (50). It is made to discharge from the sewage containing the oil characterized by discharging through the water level formation part (52) of the discharge part (52). Foreign matter separating apparatus for separating.   The oil floating on the oil discharge surface (x) above the oil discharge part (40) disposed in the separation tank (20, 50) is not disturbed by the sewage containing the fed oil. Further, a strainer part (55) and a fence (56) are provided so that the oil discharge part (40) can be easily fed into the oil discharge part (40). Foreign material separation device that separates foreign materials centering on   In the separation tank (50), a primary tank (51r) containing the oil discharge part (40) and a secondary tank (51b) capable of receiving water at the bottom of the primary tank (51r) by a moving pipe (51b) 51s), oil and water are separated using the fact that the specific gravity of oil and water is different in both the primary tank (51r) and the secondary tank (51s), and the secondary tank (51s) is separated. The foreign material separation which isolate | separates the foreign material centering on oil from the sewage containing the oil of any one of Claim 5 thru | or 7 which accommodated the oil adsorption material (57) which adsorb | sucks oil apparatus.   9. The wire mesh (58) is provided so that the oil adsorbent (57) does not block the water discharge pipe (51c) connected to the water discharge portion (52). A foreign matter separating apparatus for separating foreign matter mainly oil from waste water containing the described oil.

Images