JP4153059B2 - Method and apparatus for treating oil-containing wastewater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a treatment method and apparatus capable of easily and efficiently purifying oil in wastewater containing a large amount of oil such as kitchen wastewater.
[0002]
[Prior art]
In kitchen wastewater, beef factory or meat processing plant, wastewater containing a large amount of oil is generated, and equipment for purifying these oil-containing wastewater is provided in relatively large-scale factories.
However, in commercial stores and small-scale factories, a simple separator for separating oil and water from these oil-containing wastewaters is actually distributed in a grease trap A as shown in FIG. It is in.
[0003]
However, the grease trap A has a depth of about 50 to 80 cm and a housing B having a required processing volume, and an inlet C through which oil-containing wastewater flows into one side of the housing B, and oil and water on the other side. Are provided with outlets D for separating and discharging, and an appropriate number of trap plates G are formed so that an appropriate flowing water gap F is formed between the upper part of the housing B and the bottom surface E of the housing B. By being provided, an appropriate number of processing sections H are formed.
For this reason, the oil-containing wastewater that has flowed in from the inlet C is stored in the grease trap A up to the level of the outlet D, and the oil with a low specific gravity in the oil-containing wastewater is separated into the surface layer of the stored oil-containing wastewater. As a result, the separated oil is blocked by the trap plate G and adheres to the surface of the trap plate G and the inner surface of the housing B, and the separated water flows through the lower running water gap F and is discharged from the outlet D. The
[0004]
However, the oil content in the wastewater is extremely diverse, and when the animal oil or the oil-containing wastewater is at a low temperature, the oil content is easily separated, but the grease trap can also treat the oil-containing wastewater. When the temperature of vegetable oil or oil-containing wastewater is relatively high, the oil is not separated and discharged in a large amount from the outlet into the drain pipe, and this spilled oil adheres to the drain pipe, often leading to drain pipe clogging accidents. Therefore, the drain pipe is frequently cleaned, and the labor and cost for this are enormous, and there is a problem that the oil adhering in the grease trap must be frequently removed.
[0005]
In response to the problems of the present grease trap, in recent years, Bacillus subtilis of Bacillus subtilis and T. as yeast have been used as means for biochemical treatment to decompose and remove the oil content of oil-containing wastewater flowing into the grease trap. Flavificans and other so-called oil-degrading bacteria capable of degrading oil are added at a rate of about 100 to 300 g with respect to a storage capacity of 1 m ^{3, and the} oil-degrading bacteria are activated by aeration to decompose and remove the oil in the wastewater. However, the grease trap is provided in a waste water flow path that is discharged from a source of oil-containing waste water such as a kitchen, a vegetable factory, or a meat processing factory through a drain pipe. Since the grease trap is installed in a very narrow space, its volume is small, so that oil-containing wastewater is sequentially introduced from the inlet, so that the storage time of the oil-containing wastewater stored in the grease trap is very short. As a result, the water is drained from the outlet.
[0006]
For this reason, even if measures are taken to add oil-degrading bacteria to break down the oil content, sufficient aeration is required to promote the activity of the oil-degrading bacteria, and activation of the temporary oil-degrading bacteria can be achieved. However, in wastewater in which the concentration and dispersion of oil are remarkably fluctuating, a treatment time of at least 30 to 120 hours or more is required until the decomposition action of the oil-degrading bacteria is sufficiently exhibited. The oil-containing wastewater in the small-capacity grease trap is drained from the outlet before it is decomposed by the oil-containing wastewater that flows in sequentially from the outlet, and the oil-degrading bacteria at the corners cannot be used effectively, and the drainpipe is still frequently cleaned The situation is forced to
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and the present invention is effective in a short time and effective by dispersing and adhering the oil content to the oil adhering substrate even when the type and concentration of the oil content in the oil-containing wastewater varies. It is an object of the present invention to provide a method and apparatus for treating oil-containing wastewater that can be decomposed.
[0008]
[Means for Solving the Problems]
The technical means adopted by the present invention in order to solve the above-mentioned problem is that a required storage volume is provided, an inflow port is provided on one side, an outflow port is provided on the other side, and flows at an appropriate interval from the bottom surface. From a stainless steel wire material, a polyolefin-based synthetic fiber material, or a natural fiber material in a grease trap processing section in which an appropriate number of processing sections are formed by providing an appropriate number of trap plates from above so as to form a gap And after filling the oil adhering base material in which the mesh material of the lock material entangled with the raw material or the joined nonwoven fabric material or the mesh gap of the knitted mesh material is formed to 2 to 20 mm, While storing oil-containing wastewater from the inlet, the oil component is dispersed and adhered to the oil-adhering substrate, and aeration is performed while adding the required oil-degrading bacteria, so that the oil component is effectively decomposed in a short time. That is intended to lie in the processing method of the oil-containing wastewater, it resides in method of treating oil-containing wastewater comprising by deploying filled in a bellows the adhered oil base consisting 且 nonwoven material or netting material into the processing compartment.
[0009]
Furthermore, the inside of the grease trap is partitioned by a partition wall in the central longitudinal direction, and the processing section of each of the divided grease traps is filled with an oil-adhering base material, and an inlet is provided on one side and an inlet is provided on the other side. In addition, an outlet is provided at the bottom, and a diffuser pipe for aeration is arranged at the bottom, and the treatment apparatus for oil-containing wastewater is configured such that the mutual inlet and outlet are connected by a switching valve. The oil content is ensured by adding and aeration of the required oil-degrading bacteria while storing oil-containing wastewater in the grease trap separated by the switching valve at the inlet to the level of the outlet. By maintaining the treatment time until the oil is decomposed, and storing the oil-containing wastewater in the other grease trap by switching the inlet switching valve during the oil decomposition treatment time, the oil content alternately It is possible to effectively form a solution.
[0010]
[Operation]
The present invention using the technical means as described above has the following effects. That is, a lock material or non-woven fabric in which stainless wire material, polyolefin synthetic fiber material, or natural fiber material having adhesion to oil is entangled or joined in an appropriate number of processing compartments partitioned by a trap plate of a grease trap It is made of a material or a knitted mesh material, and is filled with an oil-adhering base material having an entanglement or joint gap or mesh size of 2 to 20 mm. In addition to being stored while still flowing in each treatment section to the level in sequence, the agglomerated oil content in the oil-containing wastewater flows along with the fine entanglement of the oil-adhering base material or the joining gap or the mesh. Disturbed and finely divided and flowed to disperse and adhere to the surface of the oil-adhering substrate, and the oil component dispersed and mixed in the wastewater is also disturbed and finely divided by the oil-adhering substrate. There is contacted dispersed adhere the oil adhering substrate surface.
[0011]
The oil-containing wastewater stored in the grease trap is added with the required oil-degrading bacteria and is also aerated to activate the oil-degrading bacteria. In order for the adhering oil and the activated oil-degrading bacteria to contact efficiently, the oil is decomposed in a short time.
In addition, when an oil adhering base material made of nonwoven fabric or netting material is spread and filled into the processing section in a bellows shape, the oil component dispersed and mixed in the wastewater is disturbed and finely divided in multiple stages during static flow. Therefore, the dispersion adhesion on the surface of the oil adhesion substrate is remarkably enhanced.
[0012]
In addition, in the treatment of wastewater with a high oil-containing concentration, a device in which the center in the grease trap is vertically divided by a partition wall and the divided inlet and outlet are connected by a switching valve, The oil-containing wastewater is stored in one grease trap in advance to the outlet level with a switching valve, and the required oil-decomposing bacteria are added and aerated, and the oil-containing wastewater that subsequently flows into the other is trapped by the switching valve. The oil-degrading bacteria that are dispersed and attached to the oil-adhering base in the grease trap are fully contacted and the oil is reliably decomposed. Distributed processing can be done reliably.
[0013]
【Example】
In the following, the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a treatment apparatus used in the present invention. The grease trap 1 has a treatment volume suitable for the amount of oil-containing wastewater and is appropriately shaped. The casing 1A is provided with an inlet 1B through which oil-containing wastewater flows, and the other side is provided with an outlet 1C through which oil-decomposed wastewater is discharged. The level at which the outlet 1 </ b> C is installed is appropriately determined depending on the storage capacity of the oil-containing wastewater stored in the grease trap 1.
Then, an appropriate number of trap plates 1F are provided so as to form an appropriate flowing water gap 1E between the upper portion of the casing 1A and the bottom surface 1D of the casing 1A. A number of processing sections 1G are formed.
[0014]
Thus, in each treatment section 1G, there is an oil adhering base material 2 for disturbing the oil component contained by the static flow accompanying the storage of the oil-containing wastewater that flows in and distributing the oil component in a large number and dispersing and adhering it. Filled.
For the formation of the oil-adhering base material 2, a material excellent in adhesion to a wide range of oils such as vegetable oil, animal oil, or mineral oil is desired. A fibrous material 2A made of a material or a natural fiber material is selected.
The oil content in the oil-containing wastewater has various concentrations and forms, such as agglomerated or dispersed mixed state, and in order to effectively decompose the oil by the added oil-degrading bacteria, the oil content is as much as possible. In order to disturb the oil-containing wastewater in a static flow state due to storage and to make a number of fine diversions, it is necessary to increase the contact with oil-degrading bacteria by dispersing and adhering to the fibrous material as shown in FIG. A lock member 20 in which 2A is cut to a required length and then entangled with each other, and the entanglement gap 20A is 2 to 20 mm and is formed to a required thickness and length, as shown in FIG. The fibrous material 2A is cut to a required length and bonded to each other, and the non-woven material 21 having a bonding gap 21A of 2 to 20 mm and a required width is formed, or the fibrous material 2A has a mesh 22A of 2 ~ 20mm and required width Netting material 22 formed so made is used.
[0015]
The reason why the entanglement gap 20A, the joining gap 21A, or the mesh size 22A of the oil adhering base material 2 is limited to 2 to 20 mm is that the oil or the waste water containing agglomerated oil is contained when the gap or mesh size is 2 mm or less. May cause a risk that the oil component is filtered on the outer surface of a part of the oil-adhering base material 2 and the oil film is increased and the decomposition action of the oil-degrading bacteria is impaired, and the gap or mesh is 20 mm or more. In the coarse case, the oil-containing wastewater is sufficiently disturbed and many fine diversions cannot be achieved, so that the oil in the oil-containing wastewater in which oil is dispersed and mixed is particularly difficult to disperse and adhere to the surface of the oil-adhering substrate. by.
[0016]
Further, since the nonwoven fabric material 21 or the netting material 22 is formed in a very thin woven fabric, the oil-adhering base material 2 sufficiently disturbs the oil-containing wastewater and makes a large number of fine diversions to remove the oil content. In order to disperse and adhere to the surface of the oil-adhering substrate 2, it is desirable that the processing section 1G be expanded and filled in a bellows shape, and as a means for spreading and filling in the bellows shape, a nonwoven fabric material 21 or a netting material 22 is previously used. As shown in FIG. 4, a method of folding and forming into a bellows shape of a required size, or a method of filling and expanding the development frame body 3 that can be developed into a required bellows shape is preferable.
[0017]
Thus, the oil-containing wastewater is introduced from the inlet 1B into the grease trap 1 in which the oil adhering base material 2 is filled in each processing section 1G, and a required proportion of oil-degrading bacteria is added to the amount of the inflow.
Many of these oil-degrading bacteria are already known, but in general, Bacillus subtilis of Bacillus subtilis and T. cerevisiae of yeast are used. flavificans and the like are used, and the amount of the oil-degrading bacterium varies depending on the quality and temperature of the oil-containing wastewater, but is preferably about 100 to 300 g based on 1 m ^{3 of the} oil-containing wastewater.
[0018]
More importantly, in order to activate the added oil-degrading bacteria and to exert the oil-decomposing action in a short time, it is necessary to aerate the oil-containing wastewater to which the oil-degrading bacteria are added. An aeration tube 4 is disposed at an appropriate position on the bottom surface 1D, and aeration amount of about 0.5 to 2.0 times per hour with respect to the volume of the grease trap 1 is made from the aeration tube 4. .
[0019]
In the present invention, the oil content in the oil-containing wastewater is decomposed and drained by such technical means. The oil-containing wastewater is sequentially generated and flows into the grease trap 1, but the storage capacity of the grease trap 1 is as follows. On the other hand, since the oil content concentration of the oil-containing wastewater that is generated varies greatly, such as the amount of mixed substances or the temperature of the wastewater, the oil-degrading bacteria in the required ratio are added and activated. Even if the required aeration is performed for the purpose, the degradation time of the oil-degrading bacteria also varies significantly due to these fluctuation factors, so that the oil component that has not been sufficiently decomposed by the oil-containing wastewater that flows in gradually becomes the outlet 1C. There is an inherent danger of spilling out and adhering or blocking in the drain pipe.
[0020]
Therefore, in the present invention, such a danger is solved by a processing device of the following means. That is, as shown in FIG. 5, a partition wall 5 is provided in the central longitudinal direction of the grease trap 1 to divide the grease trap 1 into a section trap 6 and a section trap 60, respectively, and an inlet 6A for each of the section traps 6 and 60. , 60A and outlets 6B, 60B, and the processing apparatus having a configuration in which the inlets 6A and 60A are connected by a switching valve 61A and the outlets 6B and 60B are connected by a switching valve 61B. The oil-containing wastewater is caused to flow into the one trapping trap 6 by the switching valve 61A at the inlet, and aerated while adding the required oil-degrading bacteria, stored to the level of the inlet 6B, and subsequently generated. The oil-containing wastewater is caused to flow into the other sorting trap 60 by switching the switching valve 61A, and the same operation is performed.
[0021]
When such means are used, in one of the sorting traps 5, oil-containing wastewater corresponding to the volume of the sorting trap 5 is stored, and a certain amount of oil-degrading bacteria are added and aerated to the oil-containing wastewater. However, the oil-decomposing bacteria can be sufficiently decomposed while the oil-containing wastewater flows into the other sorting trap 60 and stored.
If the oil-containing wastewater flows into the one section trap 6 again from the flow into the other section trap 60 by the switching valve 61A, the wastewater that has already been sufficiently oil-decomposed by the oil-decomposing bacteria is discharged from the outlet 6B. It will be discharged to the drain pipe more.
[0022]
【The invention's effect】
The present invention is configured as described above, and even if oil-containing wastewater, such as a kitchen, a vegetable factory, a meat processing factory, or the like containing an oil-containing concentration or the amount of inclusions fluctuates, oil adheres to the processing section of the grease trap. By simply filling the base material and adding the required oil-degrading bacteria and aeration, the oil can be decomposed and drained in a short time, so that residual oil can be reliably prevented from adhering to the wastewater pipe and clogging accidents. The reduction effect of the cleaning cost is enormous, and maintenance and management can be performed very simply by simply exchanging the oil-adhering substrate periodically.
In particular, when the water content fluctuations such as the oil content of oil-containing wastewater are significant, the central vertical direction of the existing grease trap is divided by a partition, and the oil-containing wastewater flows alternately into the divided trap. By storing and batch processing, the oil-degrading bacteria can be fully decomposed and processed, and this renovation can be done at a very low cost and easily. A wastewater treatment method and apparatus.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of a grease trap used in the present invention.
FIG. 2 is an explanatory view of an oil adhesion base material made of a lock material.
FIG. 3 is an explanatory diagram of an oil-adhering base material made of a nonwoven fabric material and a netting material.
FIG. 4 is an explanatory view of a method for developing and filling an oil-adhering base material made of a nonwoven fabric material and a netting material.
FIG. 5 is an explanatory plan view of the processing apparatus of the present invention provided with a sorting trap.
FIG. 6 is a cross-sectional explanatory view of a conventional grease trap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grease trap 1A Casing 1B Inlet 1C Outlet 1D Bottom 1E Flow gap 1F Trap plate 1G Processing section 2 Oil adhesion base material 2A Fibrous material 20 Locking material 20A Entangling gap 21 Non-woven material 21A Joint gap 22 Network base material 22A mesh Combined 3 Deployment frame 4 Aeration pipe 5 Bulkhead 6, 60 Segment trap 6A, 60A Inlet 6B, 60B Outlet 61A Inlet switching valve 61B Outlet switching valve

Claims (4)

(A) a casing for storing oil-containing wastewater;
(B) an inlet provided on one side of the casing ;
(C) an outlet provided on the other side of the casing ;
And (d) forming a water flow gap between the bottom of the casing, a first partition wall for partitioning the casing into a plurality of processing sections in the first direction;
(E) a second partition that divides the plurality of processing sections into two in a second direction orthogonal to the first direction ;
(F) a switching valve that is provided at both the inlet and the outlet, and switches the flow of water into and out of the plurality of treatment sections divided into two by the second partition;
(G) an oil adhesion base disposed between the first partition walls and / or between the first partition walls and the casing side wall;
(H) oil-degrading bacteria sprayed in the casing ;
(I) provided at the bottom of the casing, diffuser and pipe to diffuser in the casing;
An oil-containing wastewater treatment apparatus characterized by comprising: The oil-containing wastewater treatment apparatus according to claim 1, wherein the oil-adhering base material is an oil-adhering base material comprising a stainless steel material, a polyolefin-based synthetic fiber material, or a natural fiber material. Wastewater treatment equipment. The oil-containing wastewater treatment apparatus according to claim 2, wherein each material of the oil-adhering base material constitutes a lock material, a nonwoven fabric material, or a netting material, and the lock material, the non-woven material, or the netting material A device for oil-containing wastewater, wherein the mesh of the material is formed from 2 to 20 mm. 4. The oil-containing wastewater treatment apparatus according to claim 1, wherein the oil-adhering base material is filled in a bellows shape in the treatment section. 5. Equipment.

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