JP3203474B2 - Waste oil water treatment method and waste oil water treatment apparatus using the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a method for microbiologically treating a waste liquid containing a large amount of fats and oils generated in a restaurant or a food factory and a processing apparatus for performing the method. .

[0002]

2. Description of the Related Art Waste liquids containing a large amount of fats and oils generated in large quantities in restaurants, food factories, kitchens of hospitals and schools, etc., are collected in a drain pipe without any treatment, and oil particles are collected ( Scumming), taking in other debris, adhering to the pipe wall and solidifying, and clogging the drain pipe. The oils and fats make it difficult to purify sewage at a sewage treatment plant, and greatly reduce the sewage purification treatment capacity. For this reason, oil and water separation tanks (grease traps) are provided near the source of waste liquid, and regulations and guidance are given to remove and remove oils and fats until the specified drainage standard value is cleared. I have.

[0003] Conventional methods for treating oil in an oil / water separation tank are as follows. An oil / water waste liquid is poured directly from a drainage channel into an oil / water separation tank, and is temporarily retained in the oil / water separation tank to separate oil and water having different specific gravities. 2. Description of the Related Art A method is generally used in which a lump of scum having a light specific gravity is pumped out, and the mixture ratio of oil and fat in oil water is reduced to a drainage standard and discharged. In the case of this oil-water separation, it takes time to separate oil and water. In addition, the separated oils and fats must be pumped up as necessary using a vacuum or the like and discarded. This waste is also incinerated. And landfill may affect the environment. If pumping is not performed, there still remains a problem that oil water overflows from the tank without being treated. Furthermore, intense odor of oils and fats is generated in the oil-water separation tank, and it cannot be dealt with by a commercially available deodorant.

Therefore, fats and oils are harmless by microbiological treatment (water, carbon dioxide, biological cells, bioenergy, etc.).
) Has been proposed. However, in the conventional oil-water separation tank, the oil content solidifies on the upper surface of the oil-water separation tank. Since it was difficult to multiply a large number of B. in a short period of time, the ability to decompose oil was extremely low as compared with the amount of waste oil discharged, and almost no effect was obtained.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in the oil / water treatment tank, solidification (scumming) of oil is prevented to make the oil soft, whereby microorganisms against oil can be removed. It is possible to increase the adhesion area and to increase the number of microorganisms capable of decomposing in a large amount in a short time so that the microbiological decomposition process can be performed effectively in a short time, and also to remove the bad odor generated. It is an object of the present invention to provide 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, a method for treating waste oil water according to the present invention comprises the steps of: charging fat-and-oil-degrading bacteria mixed with water into waste oil water within 30 minutes; And then flow into a microbiological oil water treatment tank, where the oil is decomposed by lipolytic bacteria while staying in the oil water treatment tank so that the treated water can be discharged.

Further, the waste oil water treatment apparatus for carrying out the above-mentioned treatment method has a partition 7 for dividing a flow direction into a plurality of upper and lower parts at a predetermined height based on a water level, and a treated water discharge port 8 at the most downstream. An oil water treatment tank 1 is provided, and a water tank 3 for storing a bacterial mixed water W mixed with lipolytic bacteria B is provided in the middle of a liquid feed pipe 2 for leading the waste oil water G to the oil water treatment tank 1. A supply means 4 for supplying the bacterial mixture water W into the liquid feed pipe 2 is provided. A magnetic pipe 5 having a strong magnetic field alternating magnetic pole 6 is connected to a part of the liquid feed pipe 2 downstream of the supply means 4 and its magnetic field is controlled. The structure is such that the mixed bacterial oil water A passes through the tube 5.

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

Further, an air diffuser 9 is provided in the bottom of the oil-water treatment tank 1 so that air 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 charged into the oil / water treatment tank 1.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the present invention, the present inventor has proposed that when a strong magnetic field line is applied during the supply of oil and water, the oil and fat component is softened, and It has been discovered that degrading bacteria are activated and proliferate 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 an extremely effective treatment method of the oil water waste liquid which had been difficult until now was completed. This method can be widely applied to various treatment apparatuses for waste oil water in addition to the following examples.

The waste oil treatment technology of the present invention will be described below. In the waste oil water treatment method of the present invention, the lipolytic bacteria mixed with water for several tens of minutes are put into waste oil water, and the waste oil water is passed through a strong magnetic field alternating magnetic pole and poured into a microbiological oil water treatment tank. The oil component is decomposed by the lipolytic bacteria in a short period of time while staying in the oil water treatment tank so that the treated water can be discharged. When the feed of waste oil water containing fat-and-oil-degrading bacteria is passed through the alternating magnetic poles in a strong magnetic field, the fat and oil does not become scum but becomes jelly-like, and at the same time, the microorganisms are activated and grow in large quantities. Then, in the oil-water treatment tank, the soft oils and fats are decomposed in a short time by the fat-and-oil-decomposing bacteria grown in large quantities.

The process of decomposing oil by lipolytic bacteria comprises three steps: (1) emulsifying the oil, (2) taking up the oil into cells, and (3) biologically decomposing the oil. Oils are 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), further decomposed into acetic acid, and consumed for cytoplasm formation and various types of energy. Finally, respiratory organisms become NO ₃ , CO ₂ , and H ₂ O, and fermentation organisms become short-chain acids (such as acetic acid) or propion (a liquid with a pungent odor).

According to the present invention, the oil and fat is softened by applying magnetic lines of force to promote the emulsification of the oil, and the fat and oil-decomposing bacteria are multiplied in a short time so that a large amount of oil and fat-degrading bacteria can take up the oil into the cells. Is drastically increased, and treated at once in a short time to finally eliminate the oil content.

Next, the waste oil water treatment apparatus of the present invention according to the above method will be described with reference to the drawings. In the present invention, as shown in FIG. 1, an oil / water treatment tank 1 having a partition 7 for dividing a flow direction into a plurality of parts at a predetermined height in a vertical direction based on a water level and having a treated water discharge port 8 at the most downstream is provided. 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 gas generated by installing an ozone generator 10 is injected into the oil-water separation tank 1. I do. The ozone mixing amount is set to about 0.3 ppm. The odor sources are ammonia and hydrogen sulfide gas, which are oxidized and deodorized by ozone gas (O ₃ ). Further, the ceramic catalyst 11 in the form of sand is charged into the oil-water treatment tank 1. The catalyst removes offensive odors and decomposes organic halogen compounds such as trihalomethane.

A water tank 3 having a capacity of 20 liters 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 for storing the oil-decomposed bacteria mixed water W mixed with the oil-decomposed bacteria B. The tank 3 is filled with 18 liters of tap water and mixed with 300 g of fat-decomposing bacteria. Further, a drip type supply means 4 for automatically supplying the oil-decomposed bacterial mixed water W from the water tank 3 into the liquid feed pipe 2 is provided.

The supply from the supply means 4 is performed by a built-in timer.
The setting is performed at a rate of eight times a day for 15 minutes each time. In the case of a volume of 18 liters, the supply can be continued for about one month. In the middle of the liquid supply pipe 2 downstream of the automatic supply means 4, a strong magnetic field alternating magnetic pole 6 of about 1000 gauss is provided.
Are connected to each other so that the bacterial mixed oil water A 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 FIGS. 2A and 2B, a 1 mm long PVC tube having a diameter of 50 mm is used to cover the surface thereof. A permanent magnet of 300 gauss is magnetically poled (N
(S pole and S pole) are alternately attached to the front and back and back and forth. When measured inside the magnetic tube 5, it was about 1000 Gauss. The time 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 and the flow amount, but in the present apparatus, the inclination was about 2 seconds when the inclination was 5 degrees.

[0020]

[Experimental Example 1] Two experimental devices were used for the effect of the magnetic field lines of the fat-decomposing bacteria B, and a comparative experiment was conducted. One (a) is to provide a water tank for storing bacterial mixed water mixed with fat and oil-decomposing bacteria, and to install another water tank diagonally below the water tank, and to about 1000 gauss just before flowing into the lower water tank. A magnetic tube 5 having a strong magnetic field alternating magnetic pole is connected, and the magnetic tube 5 and an upper water tank are connected by a liquid feed tube. Another one (b) is to provide a water tank for storing bacterial water mixed with fat-degrading bacteria, install another water tank diagonally below the water tank, and connect both with a liquid feed pipe. .

Then, 300 g of the fat / nutrient-mixed freeze-dried terrier is placed in 18 L of 30 ° C. water for 20 days.
After the separation, the mixture was flowed through the magnetic tube 5 (a) and without the magnetic tube 5 (b), and was retained in a lower water tank. Then, the sample was allowed to flow, sampled from the lower water tank every 30 minutes, and observed under a microscope. The results were as shown in Table 1 below.
The fat and nutrient mixed freeze dried terrier used in this test were bacteria A of company A, bacteria B and C of company B.
Bacteria C, three of which were tested.

Then, three minutes after flowing into the lower water tank, sampling was performed and observed with a microscope. As shown in FIGS. 3A and 3B, (a) was affected by the line of magnetic force. It was confirmed that the spherical bacteria of the bacterium became small, but grew, and the rod-shaped bacteria grew actively and moved around, and the number of solids increased about twice. But,
The bacteria in (b) had no change in growth. This confirmed that the bacteria were activated in a short time immediately after receiving the magnetic field lines.

[0023]

[Table 1] Growth rate over time based on the number of bacteria immediately after mixing (unit: times) [(a): With magnetic tube 5, (b): without magnetic tube 5] Bacteria A Bacteria B Bacteria C (A) (B) (b) (b) (b) (b) After 30 minutes 32 3 2 1.8 1.5 After 60 minutes 10 49 4 33 2 After 90 minutes 25 88 22 84 3

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

As shown in FIGS. 4 and 5, water temperature and pH affect the growth of bacteria, but water temperature and pH did not change due to the lines of magnetic force. 4 and 5
Is 300 g of frozen nutrient mixed fat dry terrier
Was mixed in 18 L of tap water, the water temperature and pH were set stepwise, and the degree of increase in the bacterial population was examined by visual observation under a microscope 60 minutes after passing through the magnetic tube 5. Immediately after mixing with tap water, there were 5 to 10 (approximately (b) in FIG. 3) in the microscope view at 400 magnification,
As shown in FIG. 4, the pH increased about 30-fold at pH 7. In addition, as shown in FIG.
There was a tendency that the increase reached about twice and became constant and gradually decreased.

[0026]

[Experimental example 2] After mixing 300 g of oil and nutrient-containing freeze-dried terrier in 18 L of 30 ° C water for 20 minutes, a comparison was made between a permanent tank immersed in the water tank and a non-immersed one. Observed. As a result, there was almost no difference in the growth rate. This concluded that the mere presence of the field lines did not affect the bacteria.

[0027]

[Experimental example 3] A water tank (300 x 20) containing 1 liter of water
0 × 250 mm) and the same mixed oil of the same vegetable oil and animal oil passed through a magnetic tube 5 having a strong magnetic field alternating magnetic pole of about 1000 Gauss. Were compared and observed. as a result,
By comparing the area at the part that appeared on the water surface, as shown in FIG.
There was a big difference. At 5 hours, the area of scum of the oil passed through the magnetic tube 5 was 5% of the total,
As much as 50% of the oil did not pass through the magnetic tube 5. From this result, it can be seen that the magnetic tube 5 having the strong magnetic field alternating magnetic pole has a great effect in preventing oil scum.

[0028]

[Experimental Example 4] An experiment was conducted using an oil-water separation tank (grease trap) equipped with an air diffuser for injecting air bubbles into the bottom part of a restaurant A actually used for waste liquid treatment. A comparison was made between a case where the magnetic tube 5 having a strong magnetic field alternating magnetic pole of about 1000 gauss was connected to the waste liquid tube upstream of the oil-water separation tank and a case where the magnetic tube 5 was not used for one day. As a result, in the case where the magnetic tube 5 was not used, the oil and fat floated and solidified on the water surface as in the past, but in the case where the magnetic tube 5 was connected, the oil and fat did not scumen and became a soft jelly or cream. -Ascended.

From this, it can be understood that the fats and oils were affected by the strong magnetic field due to the passage of the magnetic tube 5 having the strong magnetic field alternating magnetic pole of about 1000 gauss, and solidification was prevented. In addition, oxygen is supplied to the bacteria by sending air bubbles into the bottom, and oil water is circulated and mixed to increase the surface area of the jelly-like oil component that contacts the bacteria, thereby promoting decomposition.

[0030]

EXPERIMENTAL EXAMPLE 5 Using the apparatus of Experimental Example 4 in Restaurant A, bacteria were further added to the process of Experimental Example 4, and the effect was observed. The amount of bacteria was determined by placing 300 g of oil-nutrient-mixed freeze-dried terrier in 18 L of 30 ° C. water for 20 minutes, and then charged upstream of the magnetic tube 5. Then, changes in the BOD value and the amount of hexane extract in the oil water in the oil / water separation tank were observed. The results were as shown in Table 2 below.

[0031]

[Table 2] Inspection date BOD (mgO / l) Hexane-extracted 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 (mg / mg)
1) decreased in both cases, and it is considered that this decrease was caused by the decomposition and reduction of the oil content in the oil / water separation tank. Then, when visually observed, the oil was floated in a jelly-like form without becoming scum.

[0033]

EXPERIMENTAL EXAMPLE 6 When a small amount (about 0.2 ppm) of ozone was fed into the apparatus of Experimental Example 5 using the ozone generator 10, an intense odor of fats and oils disappeared.

[0034]

[Experimental example 7] Further, using the apparatus of the experimental example 5,
When the granular ceramic catalyst 11 containing iron oxide and titanium dioxide as main components was put into the oil-water separation tank 1 and the content of organic halogen compounds such as trihalomethane was examined, they were found to be considerably reduced. Further, the catalyst 11 was continuously tested in a small-sized combined septic tank (10-person tank) without replacing it midway. As a result, as shown in Table 3 below, on the 14th day, ammonia (NH) which caused odor was ₃ ) It was confirmed that hydrogen sulfide (H ₂ S) was reduced and almost no odor was almost eliminated.

[0035]

Table 3 sets before 7 days 14 days 30 days 120 days 360 days NH ₃ amount _{44 12 3 0.1 0.1 0.1 H 2} S content 3.4 0.8 0.7 0 0.1 0.1 0.1 odor of human being 4 3 1 3 0 0 0 pH value 7.5 7.1 7.1 7.1 7.4 7.0 ss value 20 17 21 12 8 6 BOD value 83 69 53 34 12 12 Water temperature 17 18 18 22 25 19 Transparency 11 18 21 30 30 30

[0036]

The present invention has the above-described structure, and as can be seen from the above-mentioned various experimental examples, when the magnetic tube 5 having a strong magnetic field alternating magnetic pole 6 of about 1000 gauss or more is passed,
The fats and oils are affected by the strong magnetic field to prevent scum formation, the separated floating fats and oils are softened, and the fat and oil-decomposing bacteria are activated and proliferate in a large amount in a short time. The fat-degrading bacteria that have multiplied the floating fats and fats in a very effective manner are decomposed. Then, during the short-term (about 10 to 12 hours) residence in the oil-water treatment tank, the oil component is decomposed by the oil-decomposing bacteria, so that the treated water having a very low oil content can be discharged. . In addition, the intense odor of the oils and fats in the oil-water treatment tank is effectively eliminated by a small amount of ozone, and if a catalyst is introduced into the oil-water separation tank 1, the odor and organic halogen compounds such as trihalomethane can be reduced. .

According to the present invention, the treatment and discharge of the waste liquid requires that most of the fats and oils in the flow be decomposed by the fat-decomposing bacteria, so that the scum pumping operation becomes unnecessary and troublesome. The problem of disposing of a large amount of fats and oils that had been pumped as seeds was resolved by this.

[Brief description of the drawings]

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

FIG. 2A is a sectional view of a magnetic tube, and FIG. 2B is a side view.

FIG. 3 is an enlarged view of a microscope showing a mixed bacterial water in which (a) passes through a magnetic tube and (b) passes through 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 the ratio of scum floating on the water surface.

[Explanation of symbols]

 Reference Signs List 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 pipe 10 ozone generator 11 ceramic catalyst 12 blower A bacterial mixed oil water B oil-decomposing bacteria G Waste oil water W Bacterial mixed water

Claims (6)

(57) [Claims] 1. An oil-decomposing bacterium mixed with water within 30 minutes is charged into waste oil water, and the waste oil water is passed through a strong magnetic field alternating magnetic pole, poured into a microbiological oil water treatment tank, and retained in the oil water treatment tank. A method for treating waste oil water, wherein the oil component is decomposed by oil-decomposing bacteria therein and the treated water can be discharged. 2. An oil / water treatment tank (1) having a partition (7) for dividing a flow direction into a plurality of parts at a predetermined height in a vertical direction based on a water level and having a treated water discharge port (8) at a most downstream position. Waste oil water (G)
Tank (3) for storing a bacterial mixed water (W) mixed with lipolytic bacteria (B) is provided in the middle of a liquid feed pipe (2) for guiding the water to the oil-water treatment tank (1), and the water tank (3) And a supply means (4) for supplying a mixed water of bacteria (W) from the liquid feed pipe (2) into the liquid feed pipe (2). 6. A waste oil water for carrying out the method according to claim 1, wherein a magnetic tube (5) having the structure (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 apparatus according to claim 2, wherein a strong magnetic force generated from the strong magnetic field alternating magnetic pole of the magnetic tube is about 1000 gauss or more. 4. The waste oil water treatment apparatus according to claim 2, wherein an air diffuser (9) is provided in the bottom of the oil water treatment tank (1) so that air bubbles can be injected. 5. An ozone generator (1) in an oil-water treatment tank (1).
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 catalyst (11) made of ceramic is charged into the oil water treatment tank (1).