JP3938913B2 - Oil / water separation and removal equipment - Google Patents

Oil / water separation and removal equipment Download PDF

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JP3938913B2
JP3938913B2 JP2003275045A JP2003275045A JP3938913B2 JP 3938913 B2 JP3938913 B2 JP 3938913B2 JP 2003275045 A JP2003275045 A JP 2003275045A JP 2003275045 A JP2003275045 A JP 2003275045A JP 3938913 B2 JP3938913 B2 JP 3938913B2
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oil
water
tank
separation
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JP2005034752A (en
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英春 阿部
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日本クリーンオイル株式会社
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  The purpose of the present invention is to prevent the outflow of oil at the time of final discharge by installing it at the latter stage of a general oil / water separation tank in a factory or a gas station, for example, and to temporarily store and drain rainwater wastewater at substations, etc. When draining from a water collection tank, etc. installed for the purpose, etc., the oil in the drainage is separated, recovered and removed, and the oil in the oil is purified to the standard that meets the drainage standard value of the Water Pollution Control Law. In particular, the present invention relates to an oil-water separation and removal device used as a measure for preventing leakage of legal oil in wastewater mainly containing little oil.
  Conventionally, as a method of separating and recovering oil in water containing a large amount of mixed oil from water, collection and recovery of the oil has been performed using some kind of chemicals or other separating agents. For example, in a method in which a flocculant is added to an oil-containing wastewater, an oil adsorbent composed of an oil-swellable powdered organic polymer is added to the oil-containing wastewater, and a flocculant is added to the flocculant. There is a method of performing (see Patent Document 1). There is a processing method in which a water-insoluble salt of a fatty acid obtained by enzymatic decomposition of an oil in oil-containing water is added to the oil-containing water to adsorb the oil, followed by solid-liquid separation (see Patent Document 2). In addition, there is a processing method for purifying contained wastewater using an oil adsorbent containing crude linter as an essential component (see Patent Document 3).
On the other hand, when the amount of mixed oil is low, as a measure to prevent oil leakage that is regulated by firefighting etc. at establishments that handle oil like a gas station, it floats using siphons due to the difference in specific gravity between water and oil. An oil / water separation tank is generally installed. The present applicant himself also provided an oil agglomeration separation and recovery apparatus as suitable for the treatment of those having a large amount of oil or in an emulsified state. Among these, a floating separation method using a difference in specific gravity between water and oil has been proposed as a treatment for a particularly small amount of mixed oil (see Patent Document 4). This is a separation process using floating by the siphon effect of natural inflow and oil mixed water forced to flow in by a pump or the like.
JP-A-7-96284 JP-A-6-63644 Japanese Patent Publication No.59-9234 JP 2003-125851 A
  However, in conventional oil separation and recovery methods, chemicals and other separating agents are frequently used, which may cause environmental pollution. In particular, public companies such as electric power companies need to pay attention to environmental pollution. And in the oil agglomeration separation and recovery device (siphon) by the flotation separation method that is effective as a treatment of the one with a small amount of mixed oil at the stage of final discharge, the oil content is repeatedly exposed to the resistance of the water, and the flotation separation is removed. However, since many floating oil separation tanks are provided, the entire apparatus becomes bulky, which makes maintenance difficult and may increase costs. Fundamentally, there is a residue of oil that cannot be lifted up even after multiple iterations, and complete removal that is reliable and reliable is an unrealistic process.
  Therefore, the present invention was created in view of the conventional circumstances as described above, and the entire apparatus can be made compact, maintenance can be simplified, and complete oil removal can be ensured at a low cost. An object of the present invention is to provide a device for separating and removing oil and water at the final discharge stage.
In the present invention, the crude oil comprising the steps of capturing the dispersed oil / emulsified oil in the oil water disposed in the preceding stage of the front tank 8, the agglomeration process of fine oil droplets, and the floating separation process of oil droplets utilizing the difference in specific gravity. A granulating device 4, a parallel plate device 5 in which a plurality of plate materials inclined at 45 degrees with respect to the horizontal or vertical direction in the tank 8 arranged in the next order are arranged in parallel slits, and arranged in the final stage. A moderate amount of lipophilicity is applied to a porous mesh fiber in which a water flow dispersion plate 6b is disposed on the bottom of the rear tank 6 which receives only the siphon and the oil which has not been lifted up from the siphon in the process so far. And an oil / water separation / removal device having an oil adsorbing filter device that does not allow the absorbed oil component to flow out of the felt-like oil adsorbent 6a imparted with hydrophilicity, and the oil coarsening device 4 captures and agglomerates the oil component.・ Ultra-fine fiber membrane filter that enables coarsening Thus made is formed.
The oil adsorption filter device includes a porous water dispersion plate 6b before and after the treated water is uniformly dispersed, and a felt-like oil adsorbent 6a that imparts appropriate lipophilicity and hydrophilicity to the porous network fibers sandwiched therebetween. It is assumed that the oil component consisting of is adsorbed and is not allowed to flow out.
  Since the present invention is configured as described above, it does not process only by repeated inefficient flotation separation as in the conventional system, but agglomerates and coarsens fine oil droplets in the first stage. Therefore, the subsequent separation process by the floating method is simplified and highly efficient. Further, the oil that has not been lifted up in this step is almost completely adsorbed. Thus, an oil / water separation / removal device that can reduce the size of the structure, simplify maintenance, reduce costs, and does not need to use chemicals that cause environmental pollution for oil separation is provided. be able to. Optimal for processing oils with low oil content. For example, for the purpose of preventing the oil outflow at the time of final discharge by installing it at the latter stage of a general oil / water separation tank in a factory or a gas station, or for the purpose of temporarily storing and draining stormwater wastewater at substations, etc. For example, when draining from a large-scale water tank corresponding to a room of, for example, about 30 square meters, the oil content in the drainage can be efficiently removed by draining through the oil-water separation and removal device of the present invention. It can be easily cleared, for example, 5 ppm of mineral oil and 30 ppm of animal and vegetable oil, which are drainage standard values of the Water Pollution Control Law.
  Note that the reference numerals added in the means for solving the above-described problems and the effects of the invention are given for easy reference to the parts showing the components shown in the drawings. The present invention is not limited to the structure / shape indicated by the reference numeral.
  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 1, the apparatus main body 1 includes a water absorption pump 2, a dust removal filter 3, an oil coarsening apparatus 4, a parallel plate apparatus 5, front and rear tanks 8, 6, and an oil adsorption filter. It consists of a device, a drainage pump 7 and the like. Of these, each of the oil coarsening device 4 and the parallel plate device 5 is accommodated in a box-shaped tank 8 in which clean water such as tap water is previously filled, and after passing through the parallel plate device 5, passes through a siphon. The overflowing flowing water is introduced into the oil adsorption filter device through the discharge port 8a.
  The water absorption pump 2 pumps up oil water stored in, for example, the drain pit P or the inside of the final tank of the oil / water separation tank, and the oil coarsening device through a 20 μ filter 3 for preventing foreign matter such as dust from entering. 4, for example, 100 liters of oil water per minute can be lifted.
  The oil coarsening device 4 includes a capturing step of a dispersed oil / emulsified oil in oil water, an agglomeration step of fine oil droplets, and a floating separation step of oil droplets using a difference in specific gravity. That is, the oil water that has passed through the filter 3 then passes through the coalescer (generic name of the oil coarsening material) of the oil coarsening device 4 arranged in parallel and floats as large oil droplets by the coarsening action. There is something to let you. The coalescers arranged in parallel are each provided with a flow control (not shown) at the bottom so that the amount of water can flow uniformly. At this time, the amount of water passing through each coalescer is about 6 liters per minute so that the number can be adjusted according to the capacity of the water absorption pump 2. For example, if the water absorption pump 2 is 100 liters per minute, 16 to 17 coalescers are arranged in parallel. As described above, the arrangement of the coalescer of the oil coarsening device 4 in the preceding stage of the parallel plate device 5 in the tank 8 is a feature of the present invention.
  The parallel plate device 5 is formed by arranging a plurality of stainless steel plate materials inclined at 45 degrees with respect to the horizontal direction or the vertical direction in the tank 8 in a parallel slit shape. In this configuration, resistance is applied and the floating speed of oil particles contained in the oil water is increased to increase the separation efficiency between oil and water. That is, it is considered that the water flow flows downward through a stainless steel plate arranged obliquely, and the oil component is caused to float by the resistance to sink at that time. Further, it is considered that the oil component rising through the stainless steel plate arranged obliquely can be floated by the resistance at the time of the increase. Similarly, it is considered that the oil component is caused to rise by the resistance that flows downward again from here and settles at that time. Then, only the oil component that could not be lifted up here is guided to the next tank 6, and this oil component is completely adsorbed by the oil adsorption filter device described below to achieve oil content 0 in the drainage discharged from the pump 7. . The oil coarsening device 4 parts, the parallel plate device 5 parts, and the upper part of the siphon part in the tank 8 are each partitioned by a partition wall, and the floating oil content in each section is stagnated and pre-tensioned. It is periodically removed with an adsorption sheet.
  In other words, the oil adsorption filter device uses an oil adsorbent 6a for emulsified oil wastewater treatment obtained by imparting lipophilicity and hydrophilicity to porous network fibers, and overflows after passing through the parallel plate device 5. Oil that has not floated up in the running water passing through the discharge port 8a is introduced into the oil adsorption filter device, where oil fine particles are coarsened and adsorbed on the fiber surface. This oil adsorption filter device is composed of a porous water flow dispersion plate 6b and an oil adsorbing material 6a, which are dispersed evenly in the water flow. For example, a float switch is attached to each of the upper part and the lower part as a flow control so that the water amount flows uniformly, or the drain pump 7 itself is configured as an inverter system. This is because the flowing water from the discharge port 8a is surely passed through the oil adsorbent 6a. It should be noted that clean water such as tap water is filled in the tank 6 in advance.
  As a specific configuration of the oil adsorption filter device, a water flow dispersion plate 6b made in a square for uniformly flowing water is arranged at the top, and the oil adsorbent 6a is used in order not to leak from the side. Closely fit the inner wall of the tank. The oil adsorbent 6a is, for example, Orthosorb BF-OL01 developed by Unicell Corporation of Teijin. More specifically, approximately 50 sheets of the sorbate BF-OL01 having a standard size of 50 cm × 50 cm × 0.4 cm may be used if the water absorption pump 2 is 100 liters per minute. However, as the capacity in this case, it is assumed that 6000 liters of oil water flows in and out per hour, and depending on the setting of the raw water oil content concentration, the replacement frequency of each of the oil coarsening device 4 and the oil adsorbent 6a of the oil adsorption filter device is changed. Is determined. The oil adsorption capacity of this orthosorb BF-OL01 is considered to be about 1 to 3 times its own weight, but considering the safety factor, the oil adsorption capacity of the same weight as its own weight is considered.
  The drainage pump 7 uses a slightly larger capacity than the water absorption pump 2, for example, 120 liters per minute in consideration of the resistance received when the oil adsorbent 6a of the oil adsorption filter device is passed. Further, the apparatus main body 1 is considered to be frequently used outdoors, and is based on external installation, and is waterproof as shown in the figure.
  Next, to explain an example of use and operation of the best mode configured as described above, as shown in FIG. 1, for the purpose of temporary storage and drainage of rainwater miscellaneous drainage in a substation, for example, A suction pipe is installed in the vicinity of the bottom of the drainage pit P which is a large-scale water collecting tank corresponding to, for example, a room of about 30 square meters and is sucked by the water suction pump 2. At that time, a 20 μm filter 3 is passed through for the purpose of preventing contamination of foreign matters such as dust. The oil water that has passed through the filter 3 then passes through the coalescer of the oil coarsening device 4 arranged in parallel and floats as large oil droplets by the coarsening action. At this time, the flow control is performed so that the amount of water flowing into the coalescers arranged in parallel is uniform. At this time, the amount of water passing through each coalescer is about 6 liters per minute, and the number is adjusted according to the pump capacity.
  Therefore, in the present invention, the oil component coarsened by the oil coarsening device 4 is likely to float due to the difference in specific gravity, and is guided to the upper part of the tank 8. The water flow further flows downward through the stainless steel parallel plate device 5 arranged obliquely, and the oil component is also levitated by the settling resistance at that time. Further, the oil and water rising through the stainless steel parallel plate device 5 arranged obliquely can be floated by the resistance of the rising. Similarly, it flows downward again from here, and the oil component is also levitated by the settling resistance. Only the oil that could not be lifted up here is guided from the upper part of the siphon into the next tank 6 through the discharge port 8a, and this oil is completely adsorbed by the oil adsorbent 6a, and the treated water is discharged into the drain pump 7 By discharging more, zero oil content in the wastewater is achieved. This pump uses a pump having a slightly larger capacity than the inlet pump in consideration of resistance received when the oil adsorbent is passed. In addition, it is considered that this device is often used outdoors, and is based on external installation and should be waterproof. A compact oil-water separator was realized here.
  In small factories and gas stations where it is obliged to separate, recover, and remove oil in wastewater that contains less oil, and to purify oil in oil water to a level that meets the wastewater standards of the Water Pollution Control Law, This device is compact, easy to maintain, and can be provided at low cost.
It is sectional drawing of the use condition in the best form for implementing this invention. It is a top view which similarly shows the arrangement | positioning state of a tank and an oil adsorption filter apparatus.
Explanation of symbols
P ... Drainage pit 1 ... Main unit
2 ... Water absorption pump 3 ... Filter
4 ... Oil coarsening device 5 ... Parallel plate device
6 ... Tank 6a ... Oil adsorbent
6b ... Water flow dispersion plate 7 ... Drain pump 8 ... Tank

Claims (1)

  1. Coarse oil particles consisting of a capture process of dispersed oil and emulsified oil in oil water, agglomeration process of fine oil droplets, and a floatation separation process of oil droplets using the difference in specific gravity, using an ultra-fine fiber membrane filter placed in the previous stage of the previous tank , A parallel plate device in which a plurality of plate materials inclined at 45 degrees with respect to the horizontal or vertical direction in the tank arranged in the next stage are arranged in parallel slits, a siphon arranged in the final stage, Appropriate oleophilicity and hydrophilicity were imparted to the porous netting fiber with a water flow dispersion plate placed under and tightly fitted in the rear tank that received only the oil that could not be lifted up from the siphon treatment so far An oil / water separation / removal device comprising an oil adsorption filter device made of felt-like oil adsorbent material that does not allow the absorbed oil component to flow out.
JP2003275045A 2003-07-16 2003-07-16 Oil / water separation and removal equipment Active JP3938913B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103446802A (en) * 2013-09-22 2013-12-18 中国石油集团川庆钻探工程有限公司 Drilling fluid skimming tank

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005219047A (en) * 2004-01-07 2005-08-18 Tetsukazu Urano Oil-in-water separating apparatus
CN100425316C (en) * 2005-10-13 2008-10-15 上海环宇环保成套设备有限公司 Intelligent treatment equipment of oil containing sewage
US7416657B2 (en) * 2006-03-21 2008-08-26 Nexjen Technologies Ltd. Oil water coalescing separator
JP2009006291A (en) * 2007-06-29 2009-01-15 Kansai Electric Power Co Inc:The Oil-water separation drainage system
JP5271578B2 (en) * 2008-03-24 2013-08-21 ヤンマー株式会社 Engine exhaust gas drain water filter and engine driven work machine equipped with this filter
JP5227679B2 (en) * 2008-07-01 2013-07-03 国立大学法人 筑波大学 Contaminant flotation separation and recovery device
KR100911667B1 (en) 2009-03-30 2009-08-10 지에스칼텍스 주식회사 An apparatus combined cpi with iaf for separating oil-water effluent from hou and the method of using it
CN101805074B (en) * 2010-04-20 2012-06-13 中国矿业大学 Technology for treating oil extraction-generated waste water
CN102659211B (en) * 2012-05-15 2014-03-05 泰山医学院 Method and device for automatically removing floating oil and settled sand from oil-containing wastewater
CN105254046A (en) * 2015-10-21 2016-01-20 苏树杰 Oil removal device for oil-containing water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103446802A (en) * 2013-09-22 2013-12-18 中国石油集团川庆钻探工程有限公司 Drilling fluid skimming tank
CN103446802B (en) * 2013-09-22 2016-03-16 中国石油集团川庆钻探工程有限公司 A kind of drilling fluid skimmer tank

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