JP5938431B2 - How to suppress bad smell of grease - Google Patents

Description

  The present invention relates to a method for suppressing malodor generated in a grease wrap. The present invention also relates to a grease trap malodor control agent.

  The drainage discharged from the restaurant kitchen generally contains animal and vegetable solids (potato) and oil. In order to prevent the solids and oil contained in this wastewater from flowing directly into the sewer, a grease trap is installed between the drainage pipe of the kitchen and the sewer, and the solids and oil are separated from the wastewater by the grease trap. It is common to separate. The grease trap is a drainage inlet containing solids and oil, a solids separation tank for separating the solids from the wastewater, an oil separation tank for separating the oils from the wastewater, and the solids and oils separated. At least a drainage outlet for the discharged wastewater. In the solid content separation tank, generally, a dredging is provided around the water inlet, coarse solids in the wastewater are separated by dredging, and fine solids in the drainage are settled and separated in the drainage. In the oil separation tank, the oil in the drainage is generally floated and separated on the surface of the drainage.

  In the grease trap, the oil component that floats and separates on the surface of the drainage in the oil separation tank is solidified to form floating sludge (scum), which may cause a bad odor. For this reason, it is necessary to collect the oil separated in the oil separation tank regularly and frequently. However, the operation | work which collect | recovers frequently the oil component isolate | separated in the oil content separation tank is complicated, and becomes a considerable burden for an administrator.

  In Patent Document 1, as a grease trap capable of effectively decomposing an oil component contained in the drainage, a treatment tank to which a drainage liquid containing the oil component is supplied, and an air for supplying air into the drainage liquid of the treatment tank A riser pipe having an upper and lower opening formed by extending the air supply mechanism from the bottom of the treatment tank to the liquid level of the drainage, and the riser pipe And an air pump for supplying air to the bottom of the gas generator. This air pump supplies air to the bottom of the riser pipe, and the riser pipe raises the drainage as an air lift pump to drain the liquid inside the treatment tank. The grease trap is described in which the air is supplied to the drainage liquid while stirring. According to this document, in the grease trap described in this document, the oil component contained in the drainage liquid is decomposed by the action of enzymes and microorganisms.

  In Patent Document 2, as a method for treating fat and oil scum in waste water containing fats and oils, a metal hydroxide that forms a metal soap that is insoluble or slightly soluble in water is reacted with the fat and oil to insoluble or slightly soluble in water. Is produced and the metal soap is dehydrated. This reference describes magnesium hydroxide as an example of a metal hydroxide.

JP 2010-110738 A JP-A-2005- 211766

  An object of the present invention is to provide a method capable of effectively suppressing malodor generated in a grease lap without recovering the oil in a grease separation oil separation tank over a long period of time. Moreover, the objective of this invention is also providing the malodor control agent effective in order to suppress the malodor of a grease trap over a long period of time.

  The inventor of the present invention has retained the granular material containing magnesium oxide and / or magnesium hydroxide in an amount of 60% by mass or more in the grease trap, particularly in the solid content separator. It has been found that the malodor of the grease trap can be suppressed over a long period of time without collecting the oil.

  Therefore, the present invention provides a water inlet for drainage containing animal and plant solids and oil, a separation tank for the solids, a separation tank for the oils, and an outlet for drainage from which the solids and oil are separated. A method for suppressing malodor generated in at least a grease trap, in which a particulate matter containing magnesium oxide and / or magnesium hydroxide in an amount of 60% by mass or more is retained in a solid content separation tank of the grease trap. It is in the malodor control method characterized by this.

Preferred embodiments of the malodor control method of the present invention are as follows.
(1) The granular material is retained in the solid content separation tank of the grease trap.
(2) The average projected area equivalent circle diameter of the granular material is in the range of 2 to 30 mm.
(3) The content of magnesium oxide and / or magnesium hydroxide in the granular material is 80% by mass or more.

  The present invention is also present in a malodor suppressing agent for grease traps containing granular materials having an average projected area equivalent circle diameter in the range of 2 to 30 mm and containing magnesium oxide and / or magnesium hydroxide in an amount of 60% by mass or more.

The preferable aspect of the malodor control agent of the grease trap of the said invention is as follows.
(1) The content of magnesium oxide and / or magnesium hydroxide in the granular material is 80% by mass or more.
(2) The granular material contains 80% by mass or more of magnesium hydroxide, and the apparent specific gravity is in the range of 0.8 to 2.36 g / cm ³ .
(3) The granular material contains 80% by mass or more of magnesium oxide, and the apparent specific gravity is in the range of 1.5 to 3.58 g / cm ³ .

  By using the grease trap malodor control method and the malodor control agent of the present invention, it is possible to effectively suppress the grease trap malodor over a long period of time without collecting the oil in the oil trap tank of the grease trap.

It is sectional drawing of an example of the grease trap under implementation of the malodor control method of the grease strap of this invention. It is a top view of the processing tank of the grease strap shown in FIG.

In this invention, the granular material containing 60 mass% or more of magnesium oxide and / or magnesium hydroxide is used as a malodor control agent of grease trap. That is, the granular material used as the malodor control agent of the present invention is a granular material containing 60% by mass or more of magnesium oxide alone, a granular material containing 60% by mass or more of magnesium hydroxide, magnesium oxide and magnesium hydroxide. Is a granular material containing 60% by mass or more in total. The content of magnesium oxide and / or magnesium hydroxide is preferably 80% by mass or more, more preferably 90% by mass or more, and particularly preferably 95% by mass or more. Granules containing magnesium hydroxide 80% by mass or more, the range apparent specific gravity of the 0.8~2.36g / cm ^3, it is particularly preferably from 1.0 to 2.0 g / cm ^3. Granules containing magnesium oxide more than 80 wt%, the range apparent specific gravity of the 1.5~3.58g / cm ^3, it is particularly preferred that the particular range of 1.8~3.0g / cm ^3.

  As the granular material used as the malodor control agent of the present invention, those having an average projected area circle equivalent diameter of 2 to 30 mm are generally used. Since the granular material whose average projected area equivalent circle diameter is in the above range is difficult to be washed away by the waste water flowing inside the grease trap, the solid matter accumulated at the bottom of the solid content separation tank (solid matter separated from the waste water) is deposited. It tends to stay in a layer (a layer corresponding to a sludge layer described later). The projected area circle equivalent diameter means the diameter of a circle having the same area as the projected area of the granular material, and the average projected area circle equivalent diameter means the average of the projected area circle equivalent diameter of 100 granular objects. The projected area equivalent circle diameter can be measured using an image analyzer or the like.

  The granular material used as the malodor control agent of the present invention may contain components other than magnesium oxide and magnesium hydroxide. Examples of other components include metal oxides and / or hydroxides that react with oils such as calcium, aluminum, iron, and manganese to form metal soaps. The other component is preferably calcium oxide and / or calcium hydroxide. As an example of the granular material of magnesium oxide containing calcium oxide, a calcined product of dolomite granular material can be mentioned. As an example of the magnesium hydroxide granular material containing calcium hydroxide, what hydrated the baked material of the dolomite granular material can be mentioned.

  Moreover, the malodor control agent of the grease trap of this invention may contain granular materials other than the granular material containing magnesium oxide and / or magnesium hydroxide. Examples of other granular materials include a microbial support on which microorganisms capable of decomposing oil are supported, metal oxides and / or water that react with oils such as calcium, aluminum, iron, and manganese to form metal soap. A granular material containing an oxide can be given. The content of the particulate matter containing magnesium oxide and / or magnesium hydroxide with respect to the whole offensive odor suppressing agent is generally 60% by mass or more, preferably 80% by mass or more, and particularly preferably 90% by mass or more.

  The malodor control method for grease traps according to the present invention is mainly characterized in that the above-mentioned malodor suppressant is retained inside the grease trap, particularly in a solid content separation tank. The malodor control agent may be further retained in the oil separation tank of the grease trap. It is preferable that 90% by mass or more, particularly 95% by mass or more, of the malodor control agent retained in the grease trap is retained in the solid content separation tank. As a method of retaining the malodor suppressant in the solid content separation tank, the solid content separation tank or the oil content separation tank is arranged so that the malodor control agent is arranged at the bottom of the solid content separation tank so that the malodor control agent does not flow outside. A method in which a wall is provided at the bottom of the container and a method in which a malodor control agent is accommodated in a container having a water passage hole and the container is disposed at the bottom of the solid content separation tank can be used.

  The reason why the generation of malodor in the grease trap can be suppressed by retaining the malodor suppressant in the solid content separation tank of the grease trap is not necessarily clear, but is considered as follows. The sludge layer formed by depositing the waste water in the solid content separation tank and the solid content settled in the waste water at the bottom of the solid content separation tank is in contact with a malodor control agent, that is, magnesium oxide and / or magnesium hydroxide. To weakly alkaline. The wastewater and sludge layer in the solids separation tank are modified to weak alkalinity, and aerobic microorganisms that live there are activated, and the oil content in the wastewater is decomposed by the activated aerobic microorganisms. The amount of oil that floats on the drainage surface of the oil separation tank is reduced. Another reason is that when the waste water in the solid content separation tank comes into contact with the malodor control agent, it reacts with the oil in the waste water and magnesium to produce a poorly water-soluble magnesium soap. It is considered that the amount of oil floating on the drainage surface of the oil separation tank is reduced by settling in the solid content separation tank together with the solid content therein.

  Next, the malodor control method for grease traps of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an example of a grease trap under the implementation of the grease trap malodor control method of the present invention. FIG. 2 is a plan view of the processing tank of the grease strap shown in FIG.

  1 and 2, the grease strap 1 includes a processing tank 2 and a lid 3. The treatment tank 2 includes a drainage water inlet 4 on one side surface and a drainage outlet 5 on a side surface facing the side surface. The drainage water inlet 4 is connected to a drainage pipe (not shown) of the kitchen, and the drainage outlet 5 is connected to a sewer (not shown).

  The inside of the treatment tank 2 is divided into a solid content separation tank 7 and an oil content separation tank 8 by a partition plate 6 opened at the bottom. The solid content separation tank 7 is connected to the drainage water inlet 4, and the oil content separation tank 8 is connected to the drainage outlet 5. In the vicinity of the drainage water inlet 4 in the solid content separation tank 7, a trough 9 for separating and collecting coarse solids in the wastewater is provided. A solid content outflow prevention plate 10 is provided at the bottom of the oil content separation tank 8 to prevent the solid content separated in the solid content separation tank 7 from flowing out. An oil outflow prevention plate 11 is provided around the drainage outlet 5 in the oil separation tank 8 to prevent the oil separated in the oil separation tank 8 from flowing out. The malodor control agent 12 is disposed at the bottom of the solid content separation tank 7 and is prevented from flowing out by the solid content outflow prevention plate 10.

  In the grease strap 1 described above, wastewater containing animal and vegetable solids and oil discharged from the kitchen is treated as follows. Drainage is introduced into the solid content separation tank 7 through the drainage water inlet 4 and passes through the trough 9. The coarse solids 13 in the waste water are separated and removed by the dredger 9. The solid content in the wastewater that has passed through the gutter 9 settles in the wastewater and is deposited on the bottom of the solid content separation tank 7 to form a sludge layer 14. The waste water and the sludge layer 14 in the solid content separation tank 7 are kept weakly alkaline by the dissolution of magnesium oxide and / or magnesium hydroxide in the malodor control agent 12. The waste water from which the solid content has been separated in the solid content separation tank 7 is introduced into the oil content separation tank 8 through the opening below the partition plate 6. In the oil separation tank 8, the oil in the drainage floats up in the drainage and forms an oil layer 15 in the upper part of the oil separation tank 8. The drainage from which the oil has been separated in the oil separation tank 8 is discharged to the sewer through the drainage outlet 5.

  The volume of the processing tank 2 is generally in the range of 10 to 500L. The amount of the malodor suppressing agent 12 to be charged once is generally in the range of 10 to 1000 g, preferably in the range of 30 to 800 g, particularly preferably in the range of 50 to 500 g, with respect to the volume 100 L of the treatment tank 2. It is preferable to add the odor control agent 12 after the odor control agent 12 is added and before the strong odor is generated from the grease wrap 1. The timing of additional addition of the malodor control agent 12 is generally in the range of 3 to 6 months, although it depends on the amount of waste water to be treated with grease trap.

[Comparative Example 1]
A grease strap (W600 mm × D1000 mm × H600 mm) installed at the foot of a commercial kitchen was used as a treatment target for 1.5 months from the middle of May without using any special odor control means. When the lid of the grease trap after use was opened, the water surface of the oil separation tank was covered with floating sludge, and a strong malodor (oxidized odor of oil) was generated.

[Example 1]
The interior of the grease strap used in Comparative Example 1 was washed with detergent and water. 300 g of granular magnesium oxide (purity: 99 mass%, average projected area equivalent circle diameter: 3.01 mm, apparent specific gravity: 2.01 g / cm ³ ) as a malodor suppressant is charged into the solid content separation tank of the grease trap after washing. After settling on the bottom, the lid was put on and the grease strap was used. One month after the start of use, when the lid of the grease strap was opened, the generation of bad odor was hardly felt. Furthermore, when the lid of the grease strap was opened 3 months after the start of use, almost no odor was felt. In addition, no floating sludge is seen on the surface of the stored water in the oil separation tank, and the solid content separation tank shows no turbidity so that the bottom sludge layer can be visually confirmed. It was. Furthermore, when the lid of the grease strap was opened 5.5 months after the start of use, almost no bad odor was felt, but a small amount of floating sludge was generated on the water surface of the oil separation tank. Moreover, the granular magnesium oxide in the solid content separation tank almost disappeared.

DESCRIPTION OF SYMBOLS 1 Grease strap 2 Treatment tank 3 Lid 4 Drain water inlet 5 Drain outlet 6 Partition plate 7 Solid content separation tank 8 Oil content separation tank 9 籠 10 Solid content outflow prevention plate 11 Oil content outflow prevention plate 12 Odor control agent 13 Coarse solid content 14 Sludge layer 15 Oil layer

Claims (8)

Divided by a solids separation tank equipped with a water inlet for wastewater containing animal and vegetable solids and oil containing a mixture of coarse solids and sludge , a slag separating coarse solids from the sludge, and the solids separation tank and partition plate A method for suppressing malodor generated in a grease trap including at least a grease trap including at least a discharge port for drainage from which a solid component and an oil component are separated , wherein the solid component is prevented from flowing out at the bottom of the solid component separation tank. A solid content accumulation area partitioned by a plate is provided, and particulate matter containing magnesium oxide and / or magnesium hydroxide in an amount of 60% by mass or more is retained in the sludge accumulated in the solid content accumulation area. The malodor control method. The malodor control method according to claim 1, wherein an average of the projected area equivalent circle diameter of the granular material is in a range of 2 to 30 mm. The malodor control method according to claim 1 or 2, wherein the content of magnesium oxide and / or magnesium hydroxide in the granular material is 80% by mass or more. Drainage inlet containing animal and vegetable solids and oil containing coarse solids and sludge, solids separation tank equipped with dredging to separate coarse solids from sludge, and solids outflow to the bottom of the solids separation tank In a grease trap including at least a solid content accumulation area partitioned by a prevention plate, an oil content separation tank separated by a solid content separation tank and a partition plate, and an outlet for drainage from which the solid content and the oil content are separated An odor suppressor for grease trap, which is a granular material containing 60% by mass or more of magnesium oxide and / or magnesium hydroxide, which is used by being retained in the sludge accumulated in the solid content accumulation region in order to suppress the malodor generated. The malodor suppressant for grease trap according to claim 4, wherein the average projected area equivalent circle diameter of the granular material is in the range of 2 to 30 mm. The malodor suppressant for grease trap according to claim 4 , wherein the content of magnesium oxide and / or magnesium hydroxide in the granular material is 80% by mass or more. The malodor suppressant for grease trap according to claim 4 , wherein the granular material contains magnesium hydroxide in an amount of 80% by mass or more and has an apparent specific gravity in the range of 0.8 to 2.36 g / cm ³ . The malodor suppressant for grease trap according to claim 4 , wherein the granular material contains 80% by mass or more of magnesium oxide and has an apparent specific gravity in the range of 1.5 to 3.58 g / cm ³ .

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