JPH04200601A - Oil/water separating device - Google Patents

Abstract

PURPOSE:To obtain an oil/water separating device which does not clog even if solid matter is included in raw water and has an oil-droplet flocculating effect by providing a coarse-graining device adopting a fluidized bed type. CONSTITUTION:When oil containing raw water is made to flow in from a raw water inlet 1 on the lower part of a coalescer 4, the raw water is risen in the coalescer 4 and passed through a dispersing part 2, and is dispersed uniformly. As a result, particles filling upper zone of the dispersing part 2 form a fluidized bed 3. In this bed, the oil contents of the raw water are made coarse grains to form large oil droplets. The raw water containing these droplets is bed from an outlet 5 to an oily water separator where oil is easily separated from water. Further, if the solid matter deposits above and below the fluidized bed, it is discharged from solid matter outlets 8. As a result, the raw water can be treated stably and without a phenomenon such as clogging for a long time even if it contains the solid matter. In addition, the oil droplets collide with each other effectively and oil coarse-graining can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for separating oil and water from general industrial wastewater, and for treating ballast water, tank water, bilge water, etc. of ships.

[Conventional technology]

Generally, it is difficult to remove oil from wastewater containing oil with a diameter of minute oil droplets, so a method is used in which the minute oil droplets are condensed into large oil droplets, which are then floated and separated.

(Japanese Patent Publication No. 39-2448, Japanese Patent Publication No. 45-38873 and "Water Pollution Prevention Techniques and Equipment" Oil Pollution Prevention (Gencho Publishing)) Methods for coagulating the oil droplets include a packed bed of fibers and a narrow channel. There is a method called coarsening, in which when raw water containing oil is made to flow, minute oil droplets collide and form larger oil droplets. However, although this method can easily increase the size of oil droplets using a compact device, it has the disadvantage that if solids are present in the raw water, the narrow channels will be clogged and treatment will not be possible. Ta.

Therefore, the packed bed etc. had to be replaced or cleaned in a short time.

[Problem to be solved by the invention]

As mentioned above, in the conventional technology, the packed bed or narrow flow path becomes clogged with solid matter, making it unusable and requiring replacement with a new one or cleaning.

An object of the present invention is to provide an apparatus that does not become clogged even if solid matter is contained in the raw water, and that also has the effect of coagulating oil droplets (collision effect).

[Means to solve the problem]

To achieve the above objectives, ■ To prevent clogging caused by solids, solids must be allowed to pass through.

■ Increase the number of times oil droplets in water collide with each other in order to coagulate small oil droplets into large oil droplets.

In other words, a good mixed state is created.

In order to achieve the objectives (1) and (2), the objectives can be achieved by passing raw water through a fluidized bed using hydrophobic particles.

[Effect]

Generally speaking, a fluidized bed is a fluidized bed in which a liquid is made to flow from the bottom to the top, and when particles are introduced into the bed with a settling velocity that is approximately equal to or higher than the rising velocity, the average settling velocity of the solid particles and the liquid's This is a state in which the rising speeds are balanced, a certain porosity is maintained, and the particles are suspended.

Therefore, when other particles enter this layer, if the sedimentation speed is low, they will pass through the particle layer and overflow, or if they are large, they will accumulate below and be separated. In addition, particles having almost the same sedimentation velocity are retained in the fluidized bed, but the porosity is always kept constant, so no clogging occurs. If the floor height becomes high, you can remove it. This eliminates clogging caused by solid matter. Regarding the next collision of oil droplets, the particles in the fluidized bed can be considered to be completely mixed, so if the bed height is greater than a certain level, the collision of oil droplets will be sufficient.

〔Example〕

An embodiment of the present invention will be described based on FIG.

The raw water containing oil is passed through the raw water inlet 1 at the bottom of the coalescer 4.
Increase inflow. Then, the raw water rises inside the coalescer,
In order to be uniformly dispersed when passing through the dispersion section 2 and rise in the coalescer, the particles packed in the upper part of the dispersion section are placed in a fluidized bed 3.
There, the oil in the raw water is coarsened into large oil droplets, which are returned to the oil-water separator through the outlet 5, where the oil and water are easily separated. If solid matter accumulates above and below the fluidized bed, it is extracted from the solid matter extraction port 8.

FIG. 2 shows one application example in which an oil-water separator 6 is compactly integrated into a single device on the upper part of a coalescer 4, and the separated oil 7 is extracted from the upper part.

Figure 3 shows a fluidized bed using particles with a specific gravity of less than 1, and raw water flows from top to bottom. The functions of each part are the same as in FIG.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

■ Even if the raw water contains solids, clogging and other phenomena do not occur, allowing stable processing for long periods of time.

■ Collision efficiency of oil droplets is also good, and oil particles can be coarsened.

Based on the above effects, if this is used in an oil-water separator, even oil-containing wastewater containing solids can be stably and efficiently separated with a compact device and without maintenance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a device that compactly integrates an oil-water separator into the device of the present invention.
FIG. 3 is an explanatory diagram of an example in which the packed particles for a fluidized bed have a specific gravity of less than 1. DESCRIPTION OF SYMBOLS 1... Raw water inlet, 2... Dispersion part, 3... Fluidized bed, 4... Coalescer main body, 5... Outlet, 6...
Oil-water separator, system 1 diagram

Claims (1)

[Claims] 1. An oil-water separator characterized by being equipped with a coarsening device that employs a fluidized bed method.