JPS588885B2 - High Ekiji Youka Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating and removing undesirable components such as oil and solid impurities in waste liquid for purification.

BACKGROUND OF THE INVENTION Waste liquids discharged from factories, hotels, restaurants, etc. contain mineral oils and animal and vegetable oils, and various methods and devices have been tried to remove them.

The main proposed methods include oil adsorbents, inclined plates, combinations thereof, and coarse graining devices using cotton-like fibers, nonwoven fabrics, and the like.

However, in general, waste oil contains not only liquid substances such as oil but also solid impurities (hereinafter sometimes referred to as SS), and the above conventional proposals cause clogging due to SS relatively early. There are drawbacks such as SS adhering to the inclined plate and reducing the oil-water separation ability, and even if a filtration band is installed in front of the inclined plate, the filter itself will quickly become clogged with ordinary filter media. In the end, it is often necessary to replace them.

Further, grain coarsening is also insufficient.

An object of the present invention is to provide a waste liquid purification device that is less prone to clogging due to SS and has a high oil-water separation effect.

The present invention is a waste liquid purification device that is composed of an A cylinder, a B cylinder, and a feed pump, and in which the waste liquid passes through the A cylinder and the B cylinder in this order.
The cylinder is loaded with a cartridge filter made of an aggregate of mainly synthetic fibers with a coarse outer layer and a dense inner layer, and the cylinder B has a cartridge filter mainly made of an aggregate of synthetic fibers with a coarse inner layer and a dense outer layer. A cartridge filter-like element consisting of a body is loaded with a space in the upper part of the cylinder, and the waste liquid passes through the inner layer from the outer layer of the A-cylinder cartridge filter, passes through the hollow part of the filter, and exits the cylinder. This waste liquid purification device is characterized in that the waste liquid purification device is connected so that it passes through the hollow part of the B cylinder element, passes from the inner layer to the outer layer, and is discharged to the outside of the B cylinder through discharge ports provided at the top and bottom of the cylinder.

The present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows the entire apparatus of the invention.

The main part of the device consists of cylinder A and cylinder B.

The waste liquid containing SS and oil is sent to cylinder A by pump 1.

Inside the A cylinder, a cartridge filter (hollow cylindrical shape) 2 mainly made of an aggregate of synthetic fibers is loaded so that the waste liquid passes from the outside to the inside hollow part 3.

This cartridge filter has a density gradient in which the outer layer 4, ie, the inlet side, has a coarse density and the inner layer 5, ie, the outlet side has a dense density.

If you indicate what is preferable as a cartridge filter,
To express density in terms of porosity, the outer layer using fibers of 1 to 1000 denier has a porosity of 90 to 60%, the inner layer has a porosity of 80 to 50%, and the porosity is 5 to 20% between the inner and outer layers. It is better to have a rate gradient.

When waste liquid is passed from the outside to the inside of such a cartridge filter, among the impurities such as SS in the waste liquid, large particle sizes are captured near the outer layer, but as the particle size becomes smaller, the filter Particles with a large volume are captured after entering the interior, and therefore, particles with a large volume remain in the outer layer of the filter, which occupies a large volume.Although the volume of the inner layer of the filter is small, the remaining particles are small, so there is enough volume to fill the entire filter. It can be used effectively as a filtration removal material for SS, etc., so it can withstand long-term use.If polypropylene is used as a filter material, semi-solid sticky oil is easily adsorbed, so the B It is possible to prevent cylinder clogging and allow cylinder B to work effectively.

The waste liquid from which impurities such as SS have been removed is sent to the next cylinder B.

The B cylinder is loaded with an element 6 of the same material and shape as the cartridge filter of the A cylinder.
Unlike a cylindrical cartridge filter, the density gradient of the element is such that the inner layer 7 is coarse and the outer layer 8 is dense, and a continuous pipe is used so that the waste liquid passes from the inner layer 7 to the outer layer 8 through the hollow part 9 of the element. has been done.

The upper end face 10 of the element is completely closed and no waste liquid can come out from here.

Preferred elements include an inner layer using fibers of 1 to 200 deniers with a porosity of 60 to 90%, an outer layer with a porosity of 50 to 70%, and a porosity gradient of 5 to 20% between the inner and outer layers. Something is good.

When the waste liquid is passed from the inside to the outside of the element, the oil particles in the waste liquid are held in the gaps between the fibers of the element, and as they repeatedly collide, they gradually become coarse particles, but the density of the element Since the pores become smaller as the waste liquid advances due to the gradient, even the smallest oil particles are subjected to the above-mentioned coarsening effect, and the coarsened oil droplets are easily retained in the fiber gaps, causing them to collect further. This results in even larger oil droplets.

When polypropylene is used as the synthetic fiber constituting the element, its lipophilicity has a strong ability to retain the oil particles and coarse oil droplets, and coarsening is even more effective (cartridge filters with density gradients This method of coarsening fine oil particles in water was invented by Kuniaki Kashihara, a resident of Yoshimi, Moriyama City, Shiga Prefecture, and Tadao Matsumoto, one of the inventors of the present invention.

). In this way, the oil in the waste liquid that has passed to the outside of the element becomes large coarse particles and immediately floats upward in the B cylinder.

In this case, by passing to the outside of the element, that is, to the side with a larger outer diameter, the upward floating passage can generally have a wide cross section, so the rising speed becomes slow, and the oil droplets that have become coarse during this time have a specific gravity difference. Separation from water begins.

There is a space 11 above the element in cylinder B, and when the device is in use, it becomes a stagnation area filled with oil and water after passing through the element, and the separation of unseparated oil droplets is promoted, thus An oil layer is formed above, and the layer below becomes an aqueous layer via an unseparated layer.

Water that does not contain oil is discharged from the outlet 12 at the bottom of the B cylinder, and oil is discharged from the outlet 13 at the top of the B cylinder.

The feed pump 1' is used as necessary. In carrying out the present invention, as shown in FIG. 2, if a partition wall 14 is provided between the element and the cylinder inner wall in cylinder B, and the partition wall is communicated with both sides of the partition wall only at the upper part 15, the element While all of the water and coarse oil droplets in the waste liquid discharged to the outside once float upward, their separation progresses, and the separation of oil and water is performed more reliably, increasing the effectiveness of the present invention. can.

Furthermore, an inclined plate oil/water separator is installed on top of the B cylinder.
Oil-water separation ability can be further significantly increased.

In FIG. 3, which shows an example of this, a portion of the waste liquid discharged from the element containing a relatively high concentration of oil floats above the element, enters the shaft cylinder from the lower end of the inclined plate shaft cylinder 16, and enters the shaft cylinder from the lower end of the inclined plate shaft cylinder 16. It exits from a hole 17 provided near the base of each inclined plate and moves upward along the lower surface of the inclined plate 18.

In this way, separation between the coarse oil droplets is further promoted, and oil and water can be separated more reliably.

The water separated in the inclined plate type oil-water separator is discharged from the lower discharge port 19, and the amount of water discharged from the discharge port 12 and the discharge port 19 is adjusted by respective valves.

The separated oil is discharged from 13.

Incidentally, it is also possible to provide an inclined plate type oil/water separator at the lower part of the B cylinder so that the part that cannot be completely separated by the separation part is coarsened in the B cylinder.

According to the waste liquid purification apparatus of the present invention, it is possible to treat waste water containing fine particles of mineral oil, animal or vegetable oil, and separate oil and water.

It is also possible to treat contaminated emulsion-type oils such as rolling oil and cutting oil, to purify them without destroying the emulsion, and to recover and reuse them.

Furthermore, not only when there are oil droplets in water, but also when there are minute water droplets in oil, oil can be separated from water and recycled.

An example of use of the purification device of the present invention is shown.

Cartridge filter made of 6 denier polypropylene fiber, outer diameter 70 mm, inner diameter 30 mm, length 2
At 50mm, the porosity of the outer layer is 65% and that of the inner layer is 55%.
Using the device shown in Figure 1, which uses the same filter as the above filter except that the inner and outer porosity is reversed, wastewater from a hotel kitchen (oil content 5 4
, 200 ppm) at a rate of 20 l/min, the oil concentration in the waste water from the lower outlet of cylinder B was 2 ppm.

When the same wastewater was treated in the same manner using the apparatus shown in FIG. 3 (cartridge filter and element are the same), the oil concentration in all wastewater was 1 ppm or less.

[Brief explanation of the drawing]

FIG. 1 shows the waste liquid purification device of the present invention, FIG. 2 shows an example in which a partition wall is provided in the B cylinder, and FIG. 3 shows an example in which an inclined plate type oil-water separator is further provided above the B cylinder. In the figure, 1 and 1' are the feed pump, 2 is the cartridge filter, 3 is the hollow part of the filter, 4 is the outer layer of the filter, 5 is the inner layer of the filter, 6 is the element, 7 is the inner layer of the element, 8 is the outer layer of the element, 9 10 is the hollow part of the element, 10 is the upper end surface of the element, 11 is the retention area above the element, 12 is the outlet at the bottom of cylinder B, 13 is the upper outlet, 14 is the partition wall, 15 is the passage above the partition wall, 16
17 is an inclined plate shaft cylinder, 17 is a hole, 18 is an inclined plate, and 19 is a lower discharge port of an inclined plate type oil/water separator.

Claims (1)

[Claims] 1 Consists of A cylinder, B cylinder and feed pump, waste liquid is sent to A cylinder,
In the waste liquid purification device that passes the liquid through cylinder B in order, cylinder A is equipped with a cartridge filter mainly made of an aggregate of synthetic fibers with a coarse outer layer and a dense inner layer, and cylinder B has a cartridge filter with a coarse outer layer and a dense inner layer. A cartridge filter-like element consisting mainly of an aggregate of synthetic fibers with a coarse outer layer and a dense outer layer is loaded with a space in the upper part of the cylinder, and the waste liquid passes through the inner layer from the outer layer of the eight-tube cartridge filter. It is connected so that it exits the A cylinder through the hollow part, passes through the hollow part of the B cylinder element, passes from the inner layer to the outer layer, and is discharged to the B cylinder outside through the discharge ports provided at the top and bottom of the cylinder. A waste liquid purification device characterized by: