JP2006341236A - Method for cleaning kitchen waste water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the problem such as the generation of a rotting odor and deterioration of flow due to a narrow to be solved by cleaning a grease trap without requiring particular control and being decomposed with an organic substance deposited to the surface inside a conduit pipe even if a kitchen waste material is deposited to the inner wall face of a kitchen waste water introduction pipe from a sink and to the grease trap. <P>SOLUTION: This cleaning method comprises using a detergent loaded with a pineapple enzyme extracted from a pineapple fruit juice for cleaning a dish by a dish washer, introducing the cleaned waste water into the grease trap and carrying out agitation in the same grease trap. It is also preferable to agitate and supply oxygen by aerating in the grease trap. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for purifying kitchen wastewater, and more particularly to a method for purifying detergent wastewater using a dishwasher and introducing the wastewater into a grease trap.

In order to purify kitchen wastewater discharged from restaurants such as hotels or fast food, the wastewater is usually retained in a grease trap and separated into insolubles and wastewater. After performing BOD removal treatment using microorganisms containing sewage, it is discharged into the sewer.
Oil traps, food septics, and the like accumulate in grease traps and become extremely contaminated, and occupy most of the grease traps and cause clogging. Therefore, various techniques for improving them have been proposed.

However, in the above-described prior art, complicated management of adding an enzyme that decomposes oil or organic waste to the grease trap or inhabiting microorganisms is required.
Therefore, the present invention provides a treatment method that can easily purify wastewater containing animal and vegetable waste oil and a small amount of detergent, protein / starch, persistent fiber, etc. without requiring special management. It is for the purpose.

In order to achieve the above object, the invention having the following constitution is provided.
(1) Kitchen wastewater characterized by using a detergent with added pineapple enzyme extracted from pineapple juice for dishwashing by a dishwasher, introducing the washing wastewater into a grease wrap, and stirring with the greasetrap. Purification method.
(2) Kitchen wastewater characterized by using a detergent with added pineapple enzyme extracted from pineapple juice for dishwashing by a dishwasher, introducing the washing wastewater into a grease wrap, and performing aeration with the grease wrap. Purification method.
(3) In the grease trap, 1 or 2 selected from (1) an emulsifier, (2) a pineapple enzyme extracted from pineapple juice, and (3) a proteolytic enzyme, a starch degrading enzyme, a plant fiber degrading enzyme, and a saccharide degrading enzyme The method for purifying kitchen wastewater as described in (1) or (2) above, wherein two or more decomposing enzymes are added and supplied.
(4) The washing waste water discharged using the detergent added with the pineapple enzyme extracted from the pineapple juice to the dishwasher is added to the front part of the kitchen waste water introduction pipe disposed in front of the grease wrap. 6. The method for purifying kitchen wastewater according to any one of (1) to (3) above, which is characterized.
(5) A porous ceramic carrying one or more degrading enzymes selected from proteolytic enzymes, starch degrading enzymes, plant fiber degrading enzymes and saccharide degrading enzymes is immersed in grease trap. The method for purifying kitchen wastewater according to any one of (1) to (4) above.
(6) One or two or more degrading enzymes selected from proteolytic enzymes, starch degrading enzymes, plant fiber degrading enzymes, and saccharide degrading enzymes are supported on porous ceramics and accommodated in rough basket bodies. The method for purifying kitchen wastewater as described in (5) above, which is characterized.
(7) Any one of the above items (2) to (6), wherein the aeration is performed by switching between supplying oxygen-containing gas, supplying inert gas, or supplying no gas. The method for purifying kitchen wastewater according to claim 1.
(8) The content of the pineapple enzyme extracted from the pineapple juice is 0.0005 to 0.5% by weight of the whole detergent, and any one of (1) to (7) above Purification method for kitchen wastewater.
(9) The method for purifying kitchen wastewater according to any one of (1) to (8) above, wherein the detergent used in the dishwasher is a vegetable detergent.

According to the present invention, it is sufficient to use a detergent to which a pineapple enzyme extracted from pineapple juice is added as a detergent in a dishwasher, so that special management for grease trap purification is not necessary.
In addition, if the wastewater from the dishwasher is introduced into the front part of the kitchen wastewater introduction pipe located in front of the grease wrap, the kitchen waste adheres to the inner wall surface of the kitchen wastewater introduction pipe leading to the grease wrap. However, the organic matter adhering to the inner surface of the pipeline is decomposed, the problem of causing a rotting odor and the problem of constriction and deterioration of the flow are solved, the grease trap is purified, and the purification processing load on the septic tank is also reduced. The

The wastewater to be treated of the present invention mainly includes waste oils of animal and vegetable oils and fats (edible oils and fats, salad oil, tempura oil, lard, head, shortening, butter, margarine, dressing, etc.) discharged from the kitchen, and a small amount of detergent. Kitchen wastewater containing protein, starch, persistent fiber, etc.
In the present invention, since the detergent used in the dishwasher contains a pineapple enzyme, the pineapple enzyme decomposes organic matter in the kitchen wastewater when the wastewater from the washing machine is introduced into the grease wrap.
The pineapple enzyme described in Japanese Patent No. 2849018 is an enzyme that decomposes a plurality of types of high-molecular organic compounds, squeezing pineapple fruit juice, and concentrating or drying the enzyme in an active state. Liquid or powdery materials are used.
This pineapple enzyme usually contains many kinds of enzymes such as dehydrogenation, decarboxylation, deamination, desulfurization, and dechlorination, and the main components thereof are as follows.
The parentheses indicate the action object.

Alcohol dehydrogenase (alcohol)
Lactate dehydrogenase (lactose)
Glucose 6-phosphate dehydrogenase (sugar)
Aldehyde dehydrogenase (aldehyde)
L, aspartate, beta-semialdehyde, NADP oxidectase (aldehyde)
Glutamate dehydrogenase (amino acid)
Aspartate semialdehyde dehydrogenase (amino acid)
NADPH2 Chitochrome C Reactase (NADP)
Glutathione dehydrogenase (glutathione)
Trehalose phosphate synthetase (carbohydrate)
Polyphosphatase kinase (ATP)
Ethanolamine phosphae cytidyl transferase (CTP)
Trehalose phosphatase (sugar)
Metalthio phospho glycerate phosphatase (glycerin)
Inulase (inulin)
β-Mannositase (carbohydrate)
Uridine nucleosidase (amino acid)
Cytosine diaminase (cytosine)
Methylcysteine synthetase (amino acid)
Aspartate synthetase (ATP)
Succinate dehydrogenase (succinic acid)
Aconitate hydrogenase (citric acid)
Fumarate hydrogenase (malonic acid)
Maleate dehydrogenase (malonic acid)
Citrate synthetase (acetyl CouA)
Isocitrate dehydrogenase (citric acid)
LSNADP oxidase (citric acid)
Monoamine oxidase (amine)
Histaminease (amine)
Pyruvate decarboxylase (oxo acid)
ATPase (ATP)
Nucleotide pyrophosphatase (nucleic acid)
Endopolyphosphatase (ATP)
ATP phosphohydrolase (ATP)
Orotidine 5-phosphate decarboxylase (orotidine)
And other enzymes.

As described above, the pineapple enzyme contains degrading enzymes for various macromolecular organic compounds, and can be easily produced by simply squeezing pineapple juice so that it can be manufactured at low cost.
In the present invention, first, microorganisms producing various degrading enzymes such as proteolytic enzymes and starch degrading enzymes in addition to the pineapple enzyme are cultured in an ideal environment to generate a large amount of enzymes.
These pineapple enzymes are added to a detergent and mixed for use in a dishwasher.
The amount of pineapple enzyme added to the entire detergent is usually preferably 0.0005 to 0.5% by weight.
Next, the grease trap is agitated by aeration, a screw or the like, and decomposes by bringing the pineapple enzyme into contact with the organic components in the wastewater.
In the grease trap, microorganisms that consume organic pollutants may be inhabited according to a conventional method.
At that time, the microorganism must generate an enzyme suitable for the organic substance to be decomposed, and in order to decompose more kinds of organic substances, it is necessary to generate more kinds of enzymes. It is desirable that an aerobic bacterium, an anaerobic bacterium, and a facultative anaerobic bacterium are mixed at the same time.

  High-molecular organic substances such as carbohydrates, proteins, and animal and vegetable fats and oils in wastewater are decomposed into organic acids such as acetic acid, propionic acid, and oxalic acid, and lower alcohols by the action of facultative anaerobic bacteria. In addition, intermediate products such as organic acids are decomposed into methane, carbon dioxide, ammonia and the like by the action of absolute anaerobic bacteria. Furthermore, it is degraded by aerobic bacteria.

The conventional oil treatment of grease lap was to increase the activity of microorganisms by aeration for 24 hours, but now the waste oil that flows in at the start of work at the office is left untreated. It seems that the grease trap has been treated, but it puts a burden on the subsequent piping, septic tank, sewage, and river.
In the treatment of the present invention, it is preferable to perform aeration to stir the treatment liquid and supply oxygen or oxygen-free gas (for example, nitrogen gas, carbon dioxide gas, methane gas, etc.), and decompose organic substances in wastewater in a short time. Is possible. Aeration may be performed intermittently. In order to increase the growth activity of anaerobic bacteria, it is preferable to intermittently stop the supply of air and oxygen and supply nitrogen gas, carbon dioxide gas, and methane gas.

In the present invention, when waste water from a dishwasher containing a pineapple enzyme is introduced to the front part of a kitchen waste water introduction pipe line disposed in front of the grease strap, for example, a sink, the kitchen waste water between the grease straps is introduced. The problem of kitchen waste adhering to the introduction pipe and contaminating the pipe line to produce a rotting odor, or the problem of narrowing and obstructing the flow is solved, and the grease trap is also purified.
The various enzymes are also preferably used by adhering to, impregnating, and solidifying a porous molded product, for example, a sponge plastic strip, a porous ceramic block, a strip or the like. Such a material is easy to handle. For example, it can be housed in a rough basket and immersed in a grease strap.

A conventional apparatus for culturing microorganisms needs to prepare a growth environment for microorganisms. For example, the pH must be maintained at an appropriate value. In the present invention, an enzyme of a microorganism preparation having sufficient activity is used. Therefore, the environment may be moderately adjusted.
Further, the conventional method requires a complicated device, further complicated management, and high management cost. However, according to the present invention, all of them can be solved.

Next, the present invention will be described specifically by way of examples.
FIG. 1 is a perspective view of an apparatus according to a first embodiment of the present invention, FIG. 2 is a perspective view of an apparatus according to a second embodiment of the present invention, and FIG. 3 is a sectional view for explaining the apparatus of the third embodiment. It is.
In the figure, A is a dishwasher, B is a detergent supply device according to the present invention, 1 is a grease strap, 2 is a screen, 3 is an aerator, 4 is an air pump, 5a and 5b are partition plates, and 6 is An emulsifier tank, 7 is an enzyme water tank, 8 is a kitchen wastewater introduction pipe, and 9 is a purified water outlet pipe. Further, 10 is a first processing area, 11 is a second processing area, 12 is a third processing area, 13a and 13b are lower communication ports, and 14 is a sink.
First, in FIG. 1, the detergent which concerns on this invention is supplied to the dishwasher A from the detergent supply apparatus B, and dishwashing is implemented. Then, the washing waste water C is discharged from the dishwasher A, enters the sink 14, and is introduced into the grease trap 1 from the kitchen waste water introduction pipe 8.

Next, in the grease strap 1, kitchen wastewater is introduced into the net cage 2 arranged near the water surface of the first treatment region 10 formed by partitioning with the partition plate 5a, and coarse products such as vegetable scraps and bones are separated. -Collected.
On the other hand, in the grease trap 1, the fat is emulsified and dispersed.
Thereafter, the waste water in which the fat is emulsified is passed through the lower communication port 13 a of the first treatment region 10 and introduced into the second treatment region 11. An aerator 3 is installed at the bottom of the region 11, air and other bubbles are ejected therefrom, oxygen and other gases such as methane are supplied, and the second processing region 11 is stirred by the upward flow. By this agitation, the kitchen wastewater in the second treatment region 11 is brought into contact with the enzyme, air and other gases, and fat and other organic substances are decomposed.
Furthermore, the liquid subjected to the enzymatic decomposition treatment in the second treatment region 11 passes through the lower communication port 13b of the partition plate 5b and is introduced into the third treatment region 12, where the aerator 3 is provided in the same manner as the second treatment treatment region 11. Air and other air bubbles are ejected from the air, and the enzymatic decomposition is completely performed.
The enzymatic decomposition is completed in the third treatment region 12, and the purified liquid is discharged from the purified water outlet pipe 9 to the outside through the intake pipe 9a.

The above is described in the order of steps as follows.
(1) First step:
The dishwasher A is supplied with a detergent to which the pineapple enzyme extracted from the pineapple fruit juice is added from the detergent supply device B, and after washing the dishes, the washing wastewater (kitchen wastewater) is poured into the sink 14, and then Introduce into grease strap 1.
(2) Second step:
The end of the kitchen wastewater introduction pipe 8 is disposed on the upper part of the first treatment region 10 at the front of the grease wrap 1, and the kitchen wastewater to be purified is supplied to the first treatment region 10 of the grease wrap 1.
(3) Third step:
Next, in the second treatment region 11, a net basket 2 for sorting and removing coarse dust is disposed immediately below the end of the kitchen wastewater introduction pipe 8, and the coarse dust is sorted and removed by the net basket 2.
Next, in the second treatment region 11, aeration and agitation are performed, and the enzymatic decomposition greatly proceeds.
(4) Fourth step:
Thereafter, in the third treatment region 12, additional aeration is performed, and the enzymatic decomposition treatment is completed. Then, the purified water that has been subjected to the enzymatic decomposition treatment is discharged from the purified water outlet pipe 9 to the outside through the intake pipe 9a.

Next, in another embodiment shown in FIG. 2, first, kitchen wastewater is introduced from the kitchen wastewater introduction pipe 8 to the grease strap 1, but the water surface of the first treatment region 10 formed by being partitioned by the partition plate 5a. Kitchen wastewater is introduced into the net cage 2 arranged nearby, and coarse materials such as vegetable scraps and bones are separated and collected.
On the other hand, an emulsifier is added and supplied from an emulsifier tank 6 provided above the grease strap 1, and the fat is dispersed in the emulsifier.
Next, the waste water in which the fat content is dispersed in the emulsifier passes through the lower communication port 13a of the first processing region 10 and is introduced into the second processing region 11, where the pineapple enzyme and other enzymes are supplied from the enzyme water tank 7 provided thereabove. Are added and mixed. An aerator 3 is installed at the bottom of the region 11, air and other bubbles are ejected therefrom, oxygen and other gases such as methane are supplied, and the second processing region 11 is stirred by the upward flow. By this agitation, the kitchen wastewater in the second treatment region 11 is brought into contact with the enzyme, air and other gases, and fat and other organic substances are decomposed.
Thereafter, the liquid subjected to the enzymatic decomposition treatment in the second treatment region 11 passes through the lower communication port 13b of the partition plate 5b and is introduced into the third treatment region 12, where the liquid is removed from the aerator 3 similarly to the second treatment treatment region 11. Air and other bubbles are blown out, and the enzymatic decomposition is completely performed.
The enzymatic decomposition is completed in the third treatment region 12, and the purified liquid is discharged from the purified water outlet pipe 9 to the outside through the intake pipe 9a.

  Next, in another embodiment shown in FIG. 3, the added supply of emulsifier and enzyme is added to the sink 14 in the front part of the kitchen wastewater introduction pipe 8 disposed in front of the grease wrap 1. Then, even if the kitchen waste adheres to the inner wall surface of the kitchen wastewater introduction pipe 8 leading to the grease strap 1, the organic matter adhering to the inner surface of the pipe line is decomposed by the action of the emulsifier and the enzyme, and the problem of causing a rotting odor The problem that the flow is worsened by constriction is solved, and the grease trap is also purified by the action of the emulsifier and enzyme contained therein.

In addition, it is also preferable to embed an electric heater in the grease trap 1 and adjust the temperature to an appropriate temperature for enzymatic decomposition as needed.
Examples of the degrading enzymes in the enzyme water containing various enzymes described above are (1) oil degrading enzyme: lipase, (2) proteolytic enzyme: protease, (3) starch degrading enzyme: amylase, (4) fiber degrading enzyme. : Cellulase, (5) saccharide-degrading enzyme: beta-glucanase, (6) polysaccharide-degrading enzyme: hemicellulase.

In the present invention, air or oxygen may be ejected into the kitchen wastewater of the grease trap by aeration. Blowing out air or oxygen is advantageous because it is decomposed by aerobic microorganisms. In addition, by using a pineapple enzyme, an organic substance can be decomposed even when a wide pH range and a wide temperature range are employed.
It is also preferable to intermittently increase the activity of anaerobic bacteria to decompose organic components in kitchen wastewater that are difficult to decompose with aerobic bacteria. Therefore, it is also preferable to supply intermittently by switching the aeration valve to an inert gas supply line such as nitrogen, methane, or argon.
The grease trap uses oil / water separation by utilizing the difference in specific gravity between water and oil, but by adding and mixing emulsifiers, the oil / water is mixed and emulsified, and the enzyme acts on it, so the contact area is extremely large. The enzymatic decomposition treatment is completed in a short time.
According to the experimental results, organic matter decomposition in kitchen wastewater can reduce the normal hexane extract concentration by 90-95% in 6-12 hours, reduce biochemical oxygen demand (BOD) by 70-85%, Chemical oxygen demand (COD) could be reduced by 80-90% and suspended solids (SS) could be reduced by 90-95%.

The perspective view of the apparatus of 1st Example of this invention. The perspective view of the apparatus of 2nd Example of this invention. Sectional drawing for description of the apparatus of 3rd Example of this invention.

Explanation of symbols

1: grease strap,
2: Nettle,
3: Aerator,
4: Air pump,
5a, 5b: partition plate,
6: Emulsifier tank
7: Enzyme water tank,
8: Kitchen wastewater introduction pipe,
9: Purified water outlet pipe
9a: intake pipe,
10: first processing area,
11: second processing area,
12: Third processing area,
13a, 13b: lower communication port,
14: Sink A: Dishwasher
B: Detergent supply device according to the present invention,
C: Cleaning waste water from the dishwasher

Claims (9)

A method for purifying kitchen wastewater, comprising using a detergent to which pineapple enzyme extracted from pineapple fruit juice is added for dishwashing by a dishwasher, introducing the washing wastewater into a grease wrap, and performing a stirring treatment with the grease wrap. . A method for purifying kitchen wastewater, characterized by using a detergent added with pineapple enzyme extracted from pineapple juice for dishwashing by a dishwasher, introducing the washing wastewater into a grease wrap, and performing aeration with the grease wrap . In the grease trap, (1) an emulsifier, (2) a pineapple enzyme extracted from pineapple juice, and (3) one or more selected from proteolytic enzyme, starch degrading enzyme, plant fiber degrading enzyme and carbohydrate degrading enzyme The method for purifying kitchen wastewater according to claim 1 or 2, wherein a decomposing enzyme is added and supplied. Washing wastewater discharged using a detergent added with pineapple enzyme extracted from pineapple fruit juice in a dishwasher is added to the front part of the kitchen wastewater introduction pipe arranged in front of the grease wrap. The purification method of the kitchen wastewater of any one of Claims 1-3. 2. A porous ceramic carrying one or more degrading enzymes selected from a proteolytic enzyme, a starch degrading enzyme, a plant fiber degrading enzyme and a saccharide degrading enzyme, is immersed in a grease trap. The purification method of the kitchen wastewater of any one of -4. One or two or more degrading enzymes selected from proteolytic enzymes, starch degrading enzymes, plant fiber degrading enzymes and saccharide degrading enzymes are supported on porous ceramics and housed in rough basket bodies. The method for purifying kitchen wastewater according to claim 5. The aeration is performed by switching between a case of supplying an oxygen-containing gas, a case of supplying an inert gas, or a case of not supplying a gas, according to any one of claims 2 to 6. Purification method for kitchen wastewater. The method for purifying kitchen wastewater according to any one of claims 1 to 7, wherein the content of the pineapple enzyme extracted from the pineapple juice is 0.0005 to 0.5% by weight of the whole detergent. . The method for purifying kitchen wastewater according to any one of claims 1 to 8, wherein the detergent used in the dishwasher is a vegetable detergent.

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