JP2002119961A - Water cleaning method and water cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cleaning device suitable for removing substances, especially vegetable oil and animal oil, mixed in raw water discharged from restaurants and daily-dish shops. SOLUTION: This water cleaning device is provided with an agitation tank for agitating the raw water and fine carbonized grains, a sedimentation separation tank for settling and separating primary treated water which has been oil-separated in the agitation tank, and a filter of activated carbon, or the like, for filtering secondary treated water which has been settled and separated in the sedimentation separation tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus, and more particularly to a water purification apparatus for removing water from a large amount of raw water (water to be treated) containing a large amount of oil from a restaurant or a side dish manufacturing plant to purify water. Things.

[0002]

2. Description of the Related Art There have been various forms of water purification devices.
Many proposals have been made.

[0003] For the sake of simplicity, many of them purify raw water through a filtration material, that is, use a filtration material made of activated carbon or a filtration unit in which a plurality of types of filtration materials are laminated in multiple layers to obtain oil contained in the raw water. And to remove various contaminants.

A "water purification apparatus" disclosed in Japanese Utility Model Laid-Open No. 50-62964 and Japanese Utility Model Laid-Open No. 53-96369 are disclosed.
The invention of a "domestic wastewater treatment device" disclosed in Japanese Patent Application Publication No. 2000-205,087 also belongs to this type of technology.

Further, the present inventor has also disclosed Japanese Patent Application No. 10-34887.
No. 9 (Japanese Unexamined Patent Publication No. 2000-167540) has previously proposed an improved invention of a system using such a filtering material.

[0006]

If the particle size of the filter material generally used in the above-mentioned conventional water purifier, such as activated carbon, is large, clogging does not occur, but oil cannot be sufficiently removed.
On the other hand, if the particle diameter is small, the oil can be sufficiently captured and removed, but clogging occurs, and the water to be treated cannot be passed, so that there is a problem that the water cannot be purified smoothly.

The latter phenomenon can be considered as a phenomenon similar to that when water is poured into flour put in a container, the water stays above the flour and does not easily reach the bottom of the container.

In view of such problems, the present invention is to supply relatively small-diameter coal particles to raw water, stir the oil particles to adsorb oil onto the coal particles, and remove the oil particles from restaurants and factories. It is an object of the present invention to provide a water purification method and apparatus suitable for efficiently removing particularly vegetable oil and animal oil mixed in wastewater to be discharged.

[0009]

An object of the present invention is to provide a stirring tank in which raw water containing oil and a desired amount of carbonized particles are charged, and these are continuously stirred or continuously stirred for an arbitrary time. Stopping afterwards, removing treated water from the middle part of the stirring tank and purifying it, or stirring tank for stirring raw water and desired amount of carbonized particles, and sedimentation and separation of primary treated water separated by this stirring A sedimentation separation tank,
This can be achieved by providing a filter made of activated carbon or the like for further filtering the secondary treatment water separated and precipitated by the precipitation separation tank.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rectangular box-shaped main body case made of a steel plate or plastic, and a first partition plate 2 and a second partition plate 3 form a stirring tank 4, a sedimentation separation tank 5, and a filter chamber 6. Make up. A diffuser 7 is disposed in the stirring tank 4 at a predetermined distance L from the bottom. Reference numeral 8 denotes an air supply pipe connected to the air diffusion pipe 7, which is connected to an external compressed air pipe or a blower (not shown).

Although an aeration tube 7 is arranged at the bottom of the stirring tank 4 for aeration, it can be similarly stirred by a stirring blade used in a washing machine.

Reference numeral 9 denotes an inflow port provided above the agitation tank 4, from which the raw water containing oil (water to be treated) is supplied to the agitation layer 4 continuously or at appropriate intervals. 10
Is an overflow port opened in the upper central part of the first partition plate 2. The overflow port 10 is provided at a position slightly lower than the inlet 9. Numeral 11 designates a body for preventing the inflow of the coal particles and their agglomerates, which surrounds the overflow port 10 and hangs down to the intermediate height of the stirring tank 4. , 13 is this running water guide 1
2 is a deflecting plate that changes the primary treated water flowing downward by 2 in the horizontal direction. Reference numeral 14 denotes an advection port opened at a substantially intermediate height of the second partition plate 3. Reference numeral 15 denotes a filter made of activated carbon or the like provided above the filter chamber 6, and a drain port 16 is provided above the filter 15. The drain port 16 is provided at a position slightly lower than the overflow port 10 and is designed so that water flows smoothly.

Reference numeral 17 denotes a lid which is divided at the upper end of the main body case 1 into the stirring layer 4, the sedimentation / separation tank 5 and the filter chamber 6 and is detachably mounted thereon. 18, 19, and 20 indicate the water levels of the respective water tanks.

FIGS. 3 and 4 show another embodiment, in which the stirring tank 4 and the sedimentation separation tank 5 are formed separately.
FIG. 4 shows a cylindrical configuration. Reference numeral 21 denotes a communication pipe that connects the stirring tank 4 and the sedimentation separation tank 5.

Next, a method of using the water purification apparatus of the present invention configured as described above will be described.

First, before supplying oil-containing raw water (water to be treated) from the inflow port 9, the water levels 18 of each layer of the main body case 1 are adjusted.
At the same time, a predetermined amount of fresh water is filled up to 19 and 20, and at the same time, a carbide containing a considerable amount of carbonized particles having a particle size of 2 mm or less is charged into the stirring tank 4 according to the amount of raw water to be treated. Good results can be obtained by using a volume that is at least about three times the amount of oil contained in the raw water.

Note that this carbide is described in detail in Japanese Patent Application Laid-Open No. 2000-167540 previously proposed by the present inventors.

In this state, compressed air is sent from the air supply pipe 8 to the diffuser pipe 7 to generate a large amount of small-diameter bubbles from the diffuser pipe 7 to make the inside of the stirring tank 4 aerated, and to feed raw water (water) through the inlet 9. Treated water) continuously or at an arbitrary interval. The arbitrary interval is based on, for example, that raw water flows in every time washing is performed in a sink in a restaurant.

The inventors have verified that raw water has a biochemical oxygen demand (BOD) of Sample 1 ... 1800 mg /? Sample 2 ... 2200 mg /? Sample 3 ... 1700 mg /? Sample 4 ... 3400 mg Sample 5 ... 2300mg /? Sample 6 ... 3100mg /? Content of n-hexane extractable substance Sample 1 ... 380mg /? Sample 2 ... 2700mg /? Sample 3 ... 460mg /? Sample 4 ... 2000mg Sample 5: 800 mg /? Sample 6: 1200 mg /?

[0021] The carbides move upward and downward cyclically many times so as to rise in the central portion and descend in the outer peripheral portion by aeration. Oil molecules contained in the raw water are gradually adsorbed by the carbides, and after a while, the carbides are removed. Some float up and some settle down.

[0022] This is because the carbides adsorb residues as well as oil molecules, and depending on the type of residue, light ones aggregate upward and heavy ones precipitate downward.

The middle part, especially the outer periphery, is water having a low oil content. In particular, the inside of the inflow prevention wall 11 is water containing almost no oil. This is shown in Fig. 1
This is because the coal particles and the aggregates do not enter the inside of the inflow prevention wall 11.

When the water inside the inflow prevention wall 11 was sampled and inspected, it was found that the content of the n-hexane extractables had been reduced to 2.5 mg / kg. That is, the oil content of the raw water is reduced to 0.005 to 0.001.

When the raw water continues to flow through the inlet 9, the separated water having a low oil content flows into the sedimentation separation tank 5 from the overflow port 10 from inside the inflow prevention wall 11.

Water and coal particles, which contain a little but a little oil, flow into the sedimentation tank 5. In the sedimentation tank 5, most of the agglomerates of the coal particles settle, and the water with low oil content is collected in the middle part or slightly above it.

The water in the intermediate portion further flows into the filter chamber 6 from the advection port 14 and can pass through the activated carbon filter 15 to be taken out from the drain port 16 as water as close as possible to fresh water.

This water has a biochemical oxygen demand (BO)
Both D) and normal hexane extractables content cleared the environmental standards, and it was found that there was no problem in flowing the water treated by the water purification device of the present invention to the sewage.

In particular, the content of the n-hexane extractable substance was 2.5 mg / cm2, which satisfies the standard value.

After the inventor stopped the inflow from the inflow port 9 and sufficiently aerated in the stirring (aeration) tank 4, the aeration was reduced to about 10%.
After stopping for a minute, it was found that the aggregates adsorbing the oil were separated vertically, and water close to fresh water was obtained as much as possible in the middle part.

This water also satisfies the above-mentioned criteria. Therefore, it was confirmed that if the water in the intermediate portion was taken out, the environment would not be destroyed even if it was allowed to flow into sewage.

It is to be noted that agglomerates of charcoal particles that have sufficiently absorbed oil and floated on or settled below are appropriately pumped up and discarded using a vacuum suction hose or ladle, and the process is repeated by supplying new charcoal particles. To do.

The agglomerates of the pumped-up charcoal grains are suitable as plant fertilizers.

[0034]

As described above, according to the present invention, a desired amount of relatively small-sized coal particles is introduced into raw water, and the mixture is stirred to adsorb oil onto the coal particles. It is possible to provide a water purification method and a device suitable for efficiently removing especially vegetable oil and animal oil mixed in raw water of a factory. In addition, the apparatus can deodorize odors by adsorbing residues in addition to oil components to the coal powder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water purification device showing one embodiment of the present invention.

FIG. 2 is a top view of the same.

FIG. 3 is a cross-sectional view of a water purification device showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a water purification device showing another embodiment of the present invention.

[Explanation of symbols]

1 ... body case, 2 ..., 3 ... partition plate, 4 ... stirring tank, 5 ... sedimentation separation tank, 6 ... filter chamber, 7 ...
Air diffuser tube, 8 ... air supply tube, 9 ... inflow port, 10 ... overflow port, 11 ... inflow prevention body, 12 ... running water guide, 13 ...
… Deflection plate, 14… Advection port, 15… Filters 1, 1
6 ... drain outlet, 17 ... lid, 18, 19, 20 ... water level, 21 ... communicating pipe.

Claims (13)

[Claims] 1. An oil-containing raw water and a desired amount of carbonized particles are charged into a stirring tank, and these are continuously stirred or continuously stirred for an arbitrary time, and then the stirring is stopped to stop an intermediate portion of the stirring tank. A water purification method in which treated water is taken out and purified. 2. The water purification method according to claim 1, wherein the stirring tank is an aeration tank provided with a diffuser tube. 3. The water purification method according to claim 1, wherein the amount of the carbonized particles is at least three times the volume of oil contained in the raw water. 4. An oil-containing raw water and a desired amount of carbonized particles for adsorbing oil are charged into a stirring tank, and these are stirred to allow the carbonized particles to adsorb the oil contained in the raw water to the carbonized particles. At the same time, the agglomerates are floated or settled upward, the primary treated water in the middle part of the stirring tank is sent to the settling tank, and the oil is separated in the settling tank. A water purification method that takes out the next treated water to the outside and purifies it. 5. A stirring tank is charged with raw water containing oil and a desired amount of carbonized particles for adsorbing the oil, and these are stirred to allow the carbonized particles to adsorb the oil contained in the raw water to the carbonized particles. At the same time, the agglomerates are floated or settled upward, the primary treated water in the middle part of the stirring tank is sent to the settling tank, and the oil is separated in the settling tank. A water purification method in which the next treated water is taken out through a filter such as activated carbon, and then purified. 6. A water purification apparatus comprising: a stirring tank for stirring raw water and a desired amount of carbonized particles; and a sedimentation separation tank for sedimenting and separating the primary treated water separated by the stirring. 7. A stirring tank for agitating raw water and a desired amount of carbonized particles, a sedimentation separation tank for sedimenting and separating the primary treated water separated by the agitation, and a secondary sedimentation separated by the sedimentation and separation tank. A water purifier equipped with a filter such as activated carbon for further filtering the treated water. 8. The water purifier according to claim 6, wherein the stirring tank is an aeration tank having a diffuser tube. 9. A water purification apparatus according to claim 6, wherein the stirring chamber, the filter chamber accommodating the sedimentation separation tank and the filter are formed by partitioning the inside of one rectangular main body case with partition plates. Water purification equipment. 10. A water purifier according to claim 9, wherein an overflow port is provided above the partition plate between the stirring tank and the sedimentation separation tank, and the overflow port is covered on the stirring tank side to prevent inflow of carbonized particles. A water purification device equipped with an inflow prevention body. 11. The water purification apparatus according to claim 9, wherein an advection port is provided near the middle of the height of the partition plate between the sedimentation separation tank and the filter chamber. 12. The water purification apparatus according to claim 6, wherein the stirring tank and the sedimentation separation tank are formed separately, and both are connected by a transfer pipe. 13. The water purification apparatus according to claim 13, wherein the stirring tank and the sedimentation separation tank are cylindrical.