JP2007111688A - Method of purifying miscellaneous drainage and apparatus for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of purifying miscellaneous drainage, in which oil matter is simply and surely removed; the maintenance of an apparatus is simply carried out; treated water discharged from a tank is at a cleaned water level; and the clogging of a sewage pipe or the contamination of ocean water is prevented; and also to provide the apparatus for the same. <P>SOLUTION: In the method of the purifying the miscellaneous drainage: an object to be treated is the miscellaneous drainage containing old maid/washing liquid or the like produced in kitchen of restaurants, food processing plant or the like; the object to be treated is separated into old maid and waste water; the waste water is introduced into a treating tank body under a normal temperature environment; the oil matter and the waste water floated under the environment are stuck on an absorption and scraping belt to be scraped on the water surface of the tank and squeezed to separate the oil matter in the belt and the waste water out of the belt; the oil matter is stripped off from the belt; and the waste water separated from the oil matter is passed through a filtration member in the treating tank body and discharged out of the line. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a miscellaneous wastewater purification treatment method and an apparatus therefor.

For example, in a restaurant kitchen, not only leftovers such as leftovers are generated, but also a detergent for washing used containers and a large amount of washing water are generated at the same time. Not only that, a significant amount of oil and fat accompanying cooking and eating is generated. These are collectively referred to as miscellaneous wastewater, but these miscellaneous wastewaters are accompanied by fats and oils as described above. Therefore, if these are persistent, they can be easily separated and removed by agglomeration and condensation. However, the current situation is that the post-treatment was in trouble because it would flow out to the sewer and septic tank when the limit of interception was exceeded.
One of the countermeasures is a method using a grease interceptor.

However, the device that implements this method consists of a basket that accepts oil and fat, an oil adsorbent that is easy to handle, a grease interceptor that intercepts the grease that has passed through the oil adsorbent, and a cock that removes the obstructed grease. There are advantages that oil and fat can be efficiently recovered and installation is easy even in a narrow kitchen space.
However, the grease interceptor was said to give off a strong odor during the work because it could not easily remove the oil and fat that had once aggregated and solidified. In addition, the maintenance of the oil adsorbent that has captured the fat and oil is difficult, and maintenance is difficult and requires regular and appropriate management, and whether the waste water after removing the fat and oil is at a level that can be discharged. Otherwise, if it is discharged without knowing it, the sewer pipe may be clogged, causing damage to the ocean.

In order to solve the above-mentioned problems, the invention described in claim 1 is directed to treating wastewater containing fats and oils in the remaining residue and washing liquid generated in a restaurant kitchen, a food processing plant, and the like. The waste water is separated into the remaining waste and waste water, and the waste water is guided into the main body of the treatment tank. The oil and fat content is separated into the belt by squeezing and separating the waste water from the belt, and the oil and fat content is exfoliated from the belt while the remaining waste water is separated from the belt. The method of passing through a filtration membrane inside and discharging.
A second aspect of the present invention is the method according to the first aspect, wherein the remaining liquid is allowed to pass through a multi-stage filtration membrane including at least one MF membrane.
The invention described in claim 3 is intended to treat miscellaneous wastewater containing fats and oils in the remaining residue / cleaning liquid generated in a restaurant kitchen, food processing plant, etc., and guide these treatment targets into the main body of the treatment tank. The treatment tank body is a pre-stage separation screen device that separates miscellaneous wastewater into residual wastewater and wastewater, and guides the wastewater to the outside of the tank. The treatment tank main body has at least an oil separation processing unit and a filtration processing unit as a next stage of the separation screen device, and the oil separation processing unit is an oil separation processing tank into which the waste water is introduced. And an absorption rake belt that is suspended between the rollers so that it can be circulated in a slanted posture and can be squeezed, and the fat and oil that has been raked up against the outer peripheral position where the absorption rake belt circulates. Removal to remove The filtration processing section has a plurality of stages of membrane filtration means including an MF membrane as at least one stage for allowing waste water from the oil separation treatment tank to pass through, and at the downstream end of the filtration processing section. Is provided with a purified water discharge means, and is provided with a precipitate discharge means in communication with a proper place of the main body of the treatment tank.

  According to the present invention, fats and oils can be easily and reliably removed, and the maintenance and management of the apparatus is simple, and the treated water discharged from the tank can be prevented from being clogged in the sewer pipe and contaminated in the ocean at the purified water level. A wastewater purification treatment method and an apparatus for the same can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION

1 to 3 show an embodiment of a miscellaneous wastewater purification treatment apparatus according to the present invention. As shown in the figure, T is a processing tank body, the right side of FIGS. 1 and 2 is the front side F and the left side is the rear side R, and the rectangular outer bottom plate portion 1 and both side plate portions 2 and 2 and the front and rear sides. The rectangular tank body is provided with plate portions 3 and 4 and only the upper part is open, and is fixedly installed on the gantry 5.
On the upper side of the base plate portion 1, an inner bottom plate portion 7 that is gently lowered and inclined from the front side F to the rear side R is provided. Reference numeral 8 denotes an inclined guide plate portion, which is provided on the front side F of the inner bottom plate portion 7 with a slightly large inclination angle.

A first partition plate 10 and a second partition plate 11 are provided at the front portion of the processing tank body T. The first partition plate 10 is provided on the inner side of the front plate portion 3 and is connected to the front plate portion 3. A vertical waste water introduction path 12 is formed therebetween, and a first communication port 13 communicating with the waste water introduction path 12 is opened at the lower end of the first partition plate 10.
Above the waste water introduction passage 12, the gray water and the remaining slag A ₁ divided into the dregs A ₁ and sewage A ₂ led to the dregs receiving tank 15 Sogai containers and conveyor as indicated by arrow A in FIG. 2 wastewater a ₂ eliminates the like has a separating screen device 17 having the separation screen 16, such as a mesh or perforated to direct the waste water introduction passage 12 in the bath.
The screen 16 is in the shape of a saucer, and a filter such as a nonwoven fabric is provided on the screen 16 so that it can be exchanged.
In addition, this filter is made to be a system that can be disposed of after it is wound up in the other end direction so that the flat surface portion that is drawn out in a regular and sequential manner as a scroll type comes to the screen 16 and wound around the other end. Good.

A space between the first and second partition plates 10 and 11 is an oil separation processing tank (oil separation processing unit) 20. The bottom waters of the treatment tank 20, wastewater coming flows as indicated by the arrow B ₂ in FIG. From this waste water B _2, oil and fat having a low specific gravity and the like naturally floats toward the liquid surface (around 1 m from the outer bottom plate 1) H as indicated by an arrow B ₁ .
The oils and fats that have risen are already at room temperature at this stage, and an absorption rake belt 24 is hung around the aperture driving roller 22 and the driven roller 23, and a motor with a speed reducer (not shown) is used to move the arrow L in FIG. It is made to rake up by the oil and fat rake device 25 which rakes up in the direction.
The absorption rake belt 24 absorbs oil and fat and water (waste water) at the same time, but the water (waste water) is squeezed out due to the difference in viscosity by being squeezed by the squeeze driving roller 22, and only the oil and fat remains on the belt 24. Acts as follows.

In addition, as a forced squeezing method of the absorption rake belt 24, a pinch of a type in which another shaft type abutting roller is provided on the outer periphery of the squeezing drive roller 22 or the belt 24 is sandwiched on the way to the upper side of the rake belt 24. Rollers may be deployed.
The fats and oils remaining on the belt 24 are sequentially removed by a knife edge (removing means) 26 opposed thereto while being scraped and circulated downward.
The removed oil and fat is collected in the oil and fat collection tank 27 attached to the outside of the oil and fat separation processing tank 20 and then transferred to another processing step by the transport container 28 waiting downward.
These fats and oils can be used, for example, as a raw material for producing the accumulated soap. The oil / fat content collection tank 27 may be omitted, and the oil / fat content may be directly collected by the transport container 28. At this stage, most of the oil and fat (solid matter) is separated and recovered.

As indicated by the arrow B ₂ in wastewater arrow C ₁ in FIG. 2, and is introduced into the first filtration tank 31 is the first step of the next filtration treatment unit 30 through the second communication port 32 . Below the second communication port 32, a first precipitate exclusion pipe 34 communicates with the first pit 33, and the precipitate is extracted as the first stage here as in C ₂ . This extraction should be performed about once every six months since the amount of precipitation is small. In order to make the precipitation at this time effective, a counter control plate 35 is erected short from the bottom at a location immediately downstream of the pit 33. Further, an exclusion screw may be provided in the first precipitate exclusion pipe 34.

In the first filtration treatment tank 31, a first membrane filtration material (one of membrane filtration means) 37 is provided extending from the inner bottom plate portion 7 to the liquid level H so as to cross the flow. The filtering material 37, dense holes in the strainer or Bab screen (e.g., 100 microns or equivalent) first by being employed those having a so sewage arrow C ₃ in Figure 1 and 2 is transmitted as C ₄ One-stage formal filtration is to be done.

The first water purification after having passed through the first membrane filtration material 37 is introduced into the second filtering treatment tank 40 follows through a third communication port 38 as shown by an arrow D _1. At the bottom of the treatment tank 40 has to be periodically eliminated precipitate as arrow D ₂ is provided with a second precipitate eliminate pipe 41. And the 2nd membrane filter material (other one of the membrane filtration means) 42 is provided so that the upper and lower sides of the liquid level H of the 2nd filtration processing tank 40 may be provided. It is provided so as to be lowered to the side and below the liquid level H. The filter medium 42 uses an MF membrane and is further purified by passing purified water as indicated by an arrow D3. 43 is a purified water discharge pipe.
The first membrane filter 37 and the second membrane filter 42 are detachable so that they can be reused after being washed with water.

As shown in FIGS. 1 and 2, the miscellaneous wastewater containing fats and oils is treated as residual waste and washing liquid generated in restaurant kitchens and food processing plants. while such dregs are eliminated as shown by the arrow a ₁ is subjected to a separation screen device 17 as waste water is led to the oil separator 20 from the waste water introduction passage 12 as shown by arrow a _2. Here, the oil and fat that floats is removed at room temperature by the absorption rake belt 24, while the waste water is guided into the first filtration tank 31 while removing the precipitate, and the first membrane filter material. The first purified water D _{1 that} has been filtered at 37 and purified there is introduced into the second filtration tank 40 and then purified as the second purified water E through the second membrane filter 42 to the complete extent. It is discharged from the purified water discharge pipe 43 at a reusable level.
Table 1 shows the properties of the sewage (waste water) in the oil separation processing tank 20 after the oil and fat scraping device 25 is raked up by the oil and fat lifting device 25 and the purified water (discharged water) discharged from the purified water discharge pipe 43. Show.

  The top view of the miscellaneous wastewater purification treatment apparatus which shows one Embodiment of this invention.   II-II sectional view taken on the line of FIG.   III-III sectional view taken on the line of FIG.

Explanation of symbols

  T ... Processing tank main body 17 ... Separation screen device 20 ... Oil and fat separation processing tank 24 ... Absorption rake belt 25 ... Oil and fat lifting device 26 ... Knife edge (removing means) 30 ... Filtration processing unit 31 ... First filtration processing tank 37 ... 1st membrane filter material 40 ... 2nd filtration processing tank 42 ... 2nd membrane filter material.

Claims (3)

  Waste water that contains fats and oils is treated as residual waste and washing liquid generated in restaurant kitchens, food processing plants, etc., and these wastes are separated into residual waste and waste water to treat waste water. Oil and fat and waste water that floats in the environment of the tank body after being guided into the tank body are attached to the absorption cradle belt and swirled on the water surface in the tank, and the oil and fat content is drained into the belt by squeezing and separating. After the oil is separated from the belt, the oil and fat is exfoliated from the belt. On the other hand, the remaining waste water after the oil and fat is separated is passed through a filtration membrane in the treatment tank body and discharged. Wastewater purification treatment method.   The method for purifying miscellaneous wastewater according to claim 1, wherein the remaining liquid is passed through a plurality of stages of filtration membranes including at least one stage of the MF membrane.   The remaining waste generated in restaurant kitchens, food processing plants, etc., is treated as waste water containing fats and oils, and the treatment target is guided into the treatment tank body for purification. The treatment tank main body is provided with a separation screen device as a previous step for separating miscellaneous wastewater into remaining wastewater and wastewater, so that the remaining wastewater is guided to the outside of the tank, and the treatment tank main body. Has at least an oil separation processing unit and a filtration processing unit as a next stage of the separation screen device, and the oil separation processing unit has an oblique posture between the oil separation processing tank into which the waste water is introduced and the rollers. An absorption rake belt that is hung so that it can be circulated and can be squeezed, and a removing means that is disposed opposite to the outer peripheral position where the absorption rake belt circulates and removes the oil that has been raked up. Comprising said filtration The treatment unit has a multi-stage membrane filtration means including an MF membrane as at least one stage so that waste water from the oil separation treatment tank passes, and a purified water discharge means is provided at the downstream end of the filtration treatment unit. The wastewater purification treatment apparatus is characterized in that a sediment discharge means is provided in a continuous manner at an appropriate position of the treatment tank main body.

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