JPH09323094A - Method for treating waste water-containing oil and water-containing oil treating device using the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for highly efficiently treating and discharging the oil in a waste water-contg. oil by bacteria in a short time in the waste water-contg. oil treating tank and to furnish a treating device using the method. SOLUTION: This oil treating device is provided with a water-contg. oil treating tank 1 having the partitions 7 each having a specified height for dividing the tank into plural sections in the flow direction with the water level as the standard and provided with a treated water outlet 8 from the final section, a water tank 3 for storing the water W mixed with grease decomposing bacteria B disposed to a pipe 2 for directing the waste water-contg. oil G to the treating tank 1, and a means 4 for automatically supplying the water W into the pipe 2 from the water tank 3. Further, a magnetic pipe 5 having a ferromagnetic alternating magnetic poles 6 is connected to the pipe 2 on the downstream side of the means 4 to pass the bacteria-mixed water-contg. oil A through the magnetic pipe 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a technical field relating to a method for microbiologically treating a waste liquid containing a large amount of oil and fat generated in a restaurant or a food factory, and a treatment apparatus for carrying out the method. .

[0002]

2. Description of the Related Art Waste liquid containing a large amount of fats and oils, which is produced in large quantities in restaurants, food factories, hospitals and schools, etc., is collected into oil pipes without any treatment. (Scumming), other dust is taken in and adheres to the wall of the pipe and hardens, causing the problem of clogging the drain pipe. In addition, the oils and fats make it difficult to purify the sewage at the sewage treatment plant, and significantly reduce the sewage purification treatment capacity. Therefore, an oil / water separation tank (green strap) is provided near the source of the waste liquid, and it is regulated and instructed that the oil and fat should be removed and discharged until the specified drainage standard value is cleared. There is.

In the conventional method of treating oil components in an oil / water separation tank, an oil / water waste liquid is directly poured into an oil / water separation tank from a drainage channel, and is temporarily retained in the oil / water separation tank to separate oil and water having different specific gravities from each other. A method is generally used in which a floating mass of oil and fat (scum) having a low specific gravity is pumped out, and the mixing ratio of the oil and fat in the oil / water is reduced to a drainage standard for discharge. With this separation of oil and water, it takes time to separate oil and water, and the separated oil and fat must be pumped up with a vacuum or the like at any time for disposal, and this waste is also incinerated. However, landfill may affect the environment. Also, if pumping is not performed, there remains a problem that the oil and water will overflow from the tank without being treated. Furthermore, a strong offensive odor of oil and fat is generated in the oil / water separation tank, and it is impossible to deal with it with a commercially available deodorant.

Therefore, by the microbiological treatment, fats and oils are harmless substances (water, carbon dioxide, biological cells, bioenergy).
Etc.) has been proposed. However, in the conventional oil-water separation tank, since the oil content coagulates on the water level upper surface of the oil-water separation tank, the adhesion area of microorganisms is extremely small, and it was not an environment in which the microorganisms could play an active role Since it was difficult to grow a large number of the oil in a large amount in a short time, the oil decomposition ability was extremely low compared to the amount of the waste oil water discharged, and the effect could hardly be obtained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in an oil / water treatment tank, solidification (scumming) of an oil component is prevented so that the oil component is made into a soft state so that microorganisms against the oil component can be prevented. It is possible to increase the adhesion area and to grow a large number of microorganisms capable of decomposing in a short time to effectively carry out the microbiological decomposition treatment in a short time, and also to remove the malodor that is generated. The present invention provides a possible waste oil water treatment method and an efficient treatment apparatus for carrying out the method.

[0006]

In order to solve the above-mentioned problems, the method for treating waste oil water according to the present invention is such that the oil-degrading bacteria mixed with water for several tens of minutes are introduced into the waste oil water, and the waste oil water is subjected to a strong magnetic field. This is to allow the oil to be passed through the alternating magnetic poles and flow into a microbiological oil-water treatment tank, and to decompose the oil component by oil-degrading bacteria during a short time during the residence in the oil-water treatment tank to discharge the treated water.

Further, the waste oil water treatment apparatus for carrying out the above treatment method has a partition 7 for dividing the flow direction into a plurality of predetermined vertical heights based on the water level, and a treated water discharge port 8 at the most downstream side. A water tank 3 for storing the mixed water W of bacteria mixed with the fat-and-oil-decomposing bacteria B is provided in the middle of the liquid feed pipe 2 for guiding the waste oil water G to the oil water treatment tank 1, A supply means 4 for supplying the mixed water W of bacteria into the liquid feed pipe 2 is provided, and a magnetic pipe 5 having a strong magnetic field alternating magnetic pole 6 is connected in the downstream of the supply means 4 of the liquid feed pipe 2 to connect the magnetic field to the magnetic field. It is configured so that the bacterial mixed oil water A passes through the pipe 5.

Further, the strong magnetic field alternating magnetic poles 6 of the magnetic tube 5
The strong magnetic force generated from is about 1000 gauss or more.

Furthermore, an air diffuser 9 is provided in the bottom of the oil water treatment tank 1 so that bubbles can be injected.

Further, ozone can be injected into the oil / water treatment tank 1 by an ozone generator 10.

Further, a ceramic catalyst 11 is placed in the oil / water treatment tank 1.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the present invention, the present inventor has found that when a strong magnetic line of force is applied during feeding of oil water, the oil and fat content is softened, and when a strong magnetic line of force is applied during feeding of the oil and fat. It was discovered that the degrading bacteria were activated and grew in large quantities. Therefore, the experiment was repeated based on the belief that the waste oil water could be effectively treated by combining the two methods, and the extremely effective treatment method of the oil water waste liquid, which was difficult until now, was completed. This method can be widely applied to various treatment apparatuses for waste oil water other than the following examples.

The technology for treating waste oil water of the present invention will be described below. The method for treating waste oil water of the present invention is to throw fat-degrading bacteria mixed with water for several tens of minutes into waste oil water, and to pass the waste oil water through a strong magnetic field alternating magnetic pole into a microbiological oil water treatment tank, Oil is decomposed by oil-degrading bacteria in a short time during residence in the oil-water treatment tank so that the treated water can be discharged. When a solution of waste oil containing fat-and-oil-decomposing bacteria is passed through the alternating magnetic poles of a strong magnetic field, the oil-and-fat component does not become a scum and becomes a jelly, and at the same time, microorganisms are activated and proliferate in large quantities. Then, in the oil-water treatment tank, the soft fat and oil is decomposed in a short time by the fat-and-oil-degrading bacteria that have proliferated in a large amount.

The process of decomposing oil by fat-degrading bacteria consists of three steps: (1) emulsifying the oil, (2) incorporating the oil into cells, and (3) biodegrading the oil. Oil is composed of vegetable and animal lipids, which are water-insoluble compounds composed of esterified fatty acids and glycerin. When this oil is taken into bacterial cells, it is decomposed into free fatty acids and glycerin by an enzyme (lipase) and further decomposed into acetic acid, which is consumed for cytoplasm formation and various kinds of energy. Finally, in respiratory organisms, it becomes NO ₃ , CO ₂ , and H ₂ O, and in fermenting organisms, short-chain acids (acetic acid etc.) or propion (a liquid with a pungent odor).

The present invention promotes emulsification of oil by giving a magnetic line of force to soften the oil and fat, and causes oil-and-oil-decomposing bacteria to grow in a short period of time so that a large amount of oil- and fat-decomposing bacteria can take up the amount of oil into cells. Is dramatically increased and treated at once in a short time to finally decompose and eliminate oil.

Next, the waste oil water treatment apparatus of the present invention according to the above method will be described with reference to the drawings. As shown in FIG. 1, the present invention provides an oil water treatment tank 1 having a partition 7 that divides the flow direction into a plurality of upper and lower predetermined heights on the basis of the water level and having a treated water discharge port 8 at the most downstream side. An air diffuser 9 connected to a blower 12 is provided in the bottom of the oil / water treatment tank 1 so that air bubbles can be injected, and an ozone generator 10 is installed to inject ozone gas generated into the oil / water separation tank 1. To do. The amount of ozone mixed is about 0.3 ppm. The source of the bad odor is ammonia and hydrogen sulfide gas, which are oxidized and deodorized by ozone gas (O ₃ ). Further, a sand-grained ceramic catalyst 11 is put into the oil-water treatment tank 1. The catalyst removes offensive odors and decomposes organohalogen compounds such as trihalomethanes.

A water tank 3 having a capacity of 20 liters for storing the oil / fat-decomposing bacteria mixed water W mixed with the oil / fat-decomposing bacteria B is provided in the middle of the liquid feed pipe 2 for guiding the waste oil water G to the oil / water treatment tank 1. The water tank 3 is filled with 18 liters of tap water, and 300 g of fat and oil decomposing bacteria are mixed. Then, a drip-type supply means 4 for automatically supplying the oil / fat-decomposing bacteria mixed water W from the water tank 3 into the liquid feed pipe 2 is provided.

The supply from the supply means 4 is made by a built-in timer
Depending on the time, set the space to 15 times, 8 times a day. In the case of the volume of 18 liters, the supply can be continued for about 1 month. A strong magnetic field alternating magnetic pole 6 of about 1000 gauss is provided downstream of the automatic supply means 4 of the liquid feed pipe 2.
Are connected to each other so that the mixed oil water A of bacteria passes through the magnetic tube 5.

The magnetic tube 5 having the strong magnetic field alternating magnetic poles 6 will be described in detail. As shown in (a) and (b) of FIG. 2, a vinyl chloride tube having a diameter of 50 mm and a length of 1 m is used, and its surface is A permanent magnet of 300 Gauss is magnetic pole (N) at an interval of 50 mm with an equal angle of 60 degrees in the radial direction and 60 degrees in the longitudinal direction.
The poles and the S poles) are alternately attached on the front and back sides and the front and back sides to be attached. The inside of the magnetic tube 5 was measured and found to be about 1000 gauss. The time taken for the bacterial mixed oil / water A to pass through the magnetic tube 5 varies depending on the degree of inclination of the magnetic tube 5, the flow rate, etc., but in the present apparatus, the inclination gradient was about 2 seconds when the inclination was 5 degrees.

[0020]

[Experimental Example 1] Regarding the influence of the magnetic field lines of the fat-and-oil-degrading bacterium B, two experimental devices were prepared and a comparative experiment was performed. One of them (a) is to install a water tank for storing bacterial mixed water mixed with oil-degrading bacteria, and install another water tank diagonally below the water tank. A magnetic tube 5 having an alternating magnetic pole of a strong magnetic field is connected, and the magnetic tube 5 and an upper water tank are connected by a liquid delivery tube. The other one (b) is to install a water tank for storing bacteria mixed water mixed with oil-degrading bacteria, install another water tank diagonally below the water tank, and connect both by a liquid feed pipe. .

Then, 300 g of oil-fat-mixture-freeze dry quateria was added to 18 L of water at 30 ° C.
After the separation, the magnetic tube 5 was present (a) and the magnetic tube 5 was absent (b) to be retained in the lower water tank. Then, it was flowed and sampled from the inside of the water tank every 30 minutes and observed under a microscope. The results are shown in Table 1 below.
Freeze-dried bacteria containing oil and fat nutrients used in this test were bacteria A of company A and bacteria B and C of company B.
Bacterium C from the company and tested three of them.

Then, after three minutes immediately after flowing into the lower water tank, the sample was sampled and observed under a microscope. As shown in (a) and (b) of FIG. It was confirmed that the globular bacterium, which was a bacterium, grew into small grains but grew, and the rod-shaped bacterium proliferated and actively moved, and the number of solids increased about twice. But,
There was no change in the growth of the bacteria in (b). This confirmed that the bacteria were activated in a short time immediately after receiving the magnetic field lines.

[0023]

[Table 1] Proliferation rate over time based on the number of bacteria immediately after mixing (unit: double) [(a): with magnetic tube 5, (b): without magnetic tube] Bacterial A Bacterial B Bacterial C (a) (B) (b) (b) (b) (b) 30 minutes later 3 2 3 2 1.8 1.5 60 minutes later 10 4 9 4 3 2 90 minutes later 25 8 22 8 4 3

As shown in Table 1 above, in both cases (a) the increase with the magnetic tube 5 is large, but (b) the increase without the magnetic tube 5 is small, so that the growth is promoted by the lines of magnetic force. It was confirmed. And bacteria A,
It was found that the influence of magnetic field lines appeared in the order of bacteria B and bacteria C, and that there was a difference depending on the type of bacteria. Further, as a result of further continuing the test, even after passing through the magnetic tube 5, the growth rate gradually decreased after 3 hours,
After the lapse of 6 hours, it returned to the pace where it doubled in 30 minutes. Therefore, it was also confirmed that the growth promoting effect of the magnetic field lines cannot be maintained for a longer period of time. Comparing after 3 hours, it is calculated that the bacteria grow about 64 times when the magnetic field lines are not applied and about 730 times when the magnetic field lines are applied.

Further, as shown in FIGS. 4 and 5, the water temperature and pH influence the growth of bacteria, but the water temperature and pH were not changed by the lines of magnetic force. 4 and 5
Is a mixture of oil and fat, and 300g
Was mixed with 18 L of tap water, the water temperature and pH were set stepwise, and 60 minutes after passing through the magnetic tube 5, the degree of increase in the number of bacteria was examined by visual observation with a microscope. Immediately after mixing with tap water, there were 5 to 10 pieces (about (b) in FIG. 3) in the microscope view of 400 magnification.
As shown in FIG. 4, it increased about 30 times at pH 7. Also, as shown in FIG.
There was a tendency that it reached a doubling increase, became constant, and gradually decreased.

[0026]

[Experimental Example 2] 300 g of Fried Dry Cacteria mixed with oil and nutrients were mixed and placed in 18 L of water at 30 ° C for 20 minutes, and then a permanent magnet was immersed in the water tank and a permanent magnet was not immersed in the water tank. I observed. As a result, there was almost no difference in the growth rate. This simply concludes that the presence of magnetic field lines does not affect bacteria.

[0027]

[Experimental Example 3] A water tank (300 × 20) containing 1 liter of water
(0 × 250 mm), simply put the same amount of oil mixed with vegetable oil and animal oil, and put the same amount of mixed oil of the same vegetable oil and animal oil that passed through the magnetic tube 5 having a strong magnetic field alternating magnetic pole of about 1000 gauss. It was compared and observed. as a result,
By comparing the area of the surface of the water, as shown in FIG.
There was a big difference. At the 5th hour, the oil that passed through the magnetic tube 5 had a scum area of 5% of the total,
As much as 50% of the oil did not pass through the magnetic tube 5. From this result, it is understood that the magnetic tube 5 having the alternating magnetic poles of the strong magnetic field has a great effect in preventing the scumming of oil.

[0028]

[Experimental Example 4] An experiment was carried out using an oil / water separation tank (green strap) for treating a waste liquid, which is equipped with an air diffuser for sending air bubbles into the bottom portion which is actually used in the restaurant A. A waste liquid pipe upstream of the oil-water separation tank was connected to a magnetic pipe 5 having a magnetic field alternating magnetic pole of about 1000 gauss and a magnetic pipe without the magnetic pipe 5 were used for one day for comparative observation. As a result, the oil and fat content floated and solidified on the surface of water as in the case without the magnetic tube 5, but in the case where the magnetic tube 5 was connected, scum formation did not occur in the oil and fat, and a soft jelly-like or clear shape was obtained. -It surfaced in a muzzle shape.

From this, it can be understood that the oil and fat content was prevented from solidifying due to the influence of the strong magnetic field by passing through the magnetic tube 5 having a magnetic field alternating magnetic pole of about 1000 gauss. In addition, oxygen is supplied to the bacteria by sending air bubbles into the bottom portion, and oil water is circulated and stirred to increase the bacterial contact surface area of the jelly-like oil component to promote decomposition.

[0030]

[Experimental Example 5] Using the apparatus of Experimental Example 4 of Restaurant A, bacteria were further added to the process of Experimental Example 4 and the effect was observed. As for the amount of bacteria, 300 g of an oil / fat nutrient-mixed freezer dacteria was placed in 18 L of water at 30 ° C. for 20 minutes, and then charged upstream from the magnetic tube 5. Then, the changes in the BOD value and the amount of hexane extracted substance in the oil / water in the oil / water separation tank after that were observed. The results are shown in Table 2 below.

[0031]

[Table 2] Test date BOD (mgO / l) Hexane extractable substance (mg / l) January 23 (immediately after mixing) 872 72.8 January 31 314 21.8 March 12 126 10.7

As described above, the hexane extract substance (mg /
It is considered that the oil content in the oil / water separation tank was decomposed and decreased. Then, when visually observed, the oil did not become scum, but floated in a jelly shape.

[0033]

[Experimental Example 6] When a small amount (about 0.2 ppm) of ozone was fed using the ozone generator 10 using the apparatus of Experimental Example 5, a strong malodor of oil and fat disappeared.

[0034]

[Experimental Example 7] Further, using the apparatus of Experimental Example 5,
When the granular ceramic catalyst 11 containing iron oxide and titanium dioxide as main components was placed in the oil-water separation tank 1 and the content of organic halogen compounds such as trihalomethane was examined, they were considerably reduced. In addition, the catalyst 11 was continuously tested in a small combined septic tank (10 person tank) without replacing the catalyst on the way. As a result, as shown in Table 3 below, ammonia (NH ₃ ) and hydrogen sulfide (H ₂ S) were reduced, and it was confirmed that there was almost no odor.

[0035]

[Table 3] Before set 7th day 14th day 30th day 120th day 360th day NH ₃ amount 44 12 3 0.1 0.1 0.1 0.1 H ₂ S amount 3.4 0.8 0.7 0 0.1 0.1 0.1 Human sense of smell 4 3 1 0 0 0 pH value 7.5 7.1 7.1 7.1 7.1 7.4 7.4 ss value 20 17 21 12 8 6 BOD value 83 69 53 53 34 12 12 Water temperature 17 18 18 22 25 19 Transparency 11 18 21 30 30 30 30

[0036]

The operation and effect of the present invention has the above-mentioned structure. As can be seen from the various experimental examples described above, when the magnetic tube 5 having the strong magnetic field alternating magnetic poles 6 of about 1000 gauss or more is passed,
The oil and fat content is prevented from scumming under the influence of a strong magnetic field, the separated floating oil and fat is softened, and the oil and fat decomposing bacteria are activated to grow in large quantities in a short time. Then, the fat-and-oil-degrading bacteria that proliferated a large amount of the floating fat and oil decompose the treatment very effectively. Then, during the short time (about 10 to 12 hours) in the oil / water treatment tank, the oil / fat-decomposing bacteria decomposes the oil component, and the treated water having a very low oil / fat content can be discharged. . Further, the strong malodor of the oil and fat in the oil / water treatment tank is effectively eliminated by a small amount of ozone, and if a catalyst is put into the oil / water separation tank 1, the malodor and organic halogen compounds such as trihalomethane can be reduced. .

According to the present invention, the waste liquid is treated and discharged, and most of the fat and oil is decomposed by the fat and oil-decomposing bacteria in the flow. Therefore, scum pumping work becomes unnecessary and troublesome. The problem of discarding a large amount of oil and fat pumped up, which was the seed, was solved by this.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a device of the present invention.

FIG. 2 is a sectional view of the magnetic tube at (a) and a side view at (b).

FIG. 3 is a microscopic enlarged view of bacteria-mixed water in which (a) passes a magnetic tube and (b) does not pass a magnetic tube.

FIG. 4 is a graph showing the relationship between pH and bacterial growth.

FIG. 5 is a graph showing the relationship between water temperature and bacterial growth.

FIG. 6 is a graph showing a ratio of scum floating on the water surface.

[Explanation of symbols]

 1 Oil Water Treatment Tank 2 Liquid Feed Pipe 3 Water Tank 4 Supply Means 5 Magnetic Pipe 6 Strong Magnetic Field Alternating Magnetic Pole 7 Partition 8 Treated Water Discharge Port 9 Diffuser 10 Ozone Generator 11 Ceramic Catalyst 12 Blower A Bacteria Mixed Oil Water B Oil Fat Decomposing Bacteria G Waste oil water W Bacteria mixed water

Claims (6)

[Claims] 1. An oil-degrading bacterium, which has been mixed with water for several tens of minutes, is put into waste oil water, the waste oil water is allowed to pass through a magnetic field alternating magnetic pole, and then poured into a microbiological oil water treatment tank. A method for treating waste oil water, characterized in that an oil component is decomposed by oil-degrading bacteria in a short time during retention and the treated water can be discharged. 2. An oil water treatment tank (1) provided with a treated water discharge port (8) at the most downstream side, having a partition (7) for dividing the flow direction into a plurality of upper and lower predetermined heights based on the water level, Waste oil water (G)
A water tank (3) for storing bacterial mixed water (W) mixed with fat-and-oil-decomposing bacteria (B) is provided in the middle of a liquid feed pipe (2) for guiding oil to the oil-water treatment tank (1), and the water tank (3) A supply means (4) for supplying the bacterial mixed water (W) from the inside to the liquid feed pipe (2), and a strong magnetic field alternating magnetic pole (in the middle of the supply means (4) of the liquid feed pipe (2). 6. Waste oil water for carrying out the method of claim 1, characterized in that a magnetic tube (5) having 6) is connected so that the bacterial mixed oil water (A) passes through the magnetic tube (5). Processing equipment. 3. The waste oil water treatment device according to claim 2, wherein the strong magnetic force generated from the magnetic field alternating magnetic poles (6) of the magnetic tube (5) is about 1000 gauss or more. 4. The waste oil water treatment apparatus according to claim 2, wherein an air diffuser pipe (9) is provided in the bottom of the oil water treatment tank (1) so that bubbles can be injected. 5. An ozone generator (1) in the oil / water treatment tank (1).
5. The ozone can be injected from 0).
The waste oil water treatment device according to any one of the above. 6. The waste oil water treatment apparatus according to claim 2, wherein a ceramic catalyst (11) is placed in the oil water treatment tank (1).