JPH08196807A - Oil-water separator for oil-containing waste water - Google Patents

Abstract

PURPOSE: To surely separate oil and water with a simple separator and to use the separator even under severe environmental conditions by previously filling an oil-water separator with fixed amts. of water and oil and sprinkling down an oil-contg. waste water into the separator. CONSTITUTION: An oil-contg. waste water 2 accumulated in a tank 1 is sucked up by a pump 3 and supplied to a sprinkler 17 in an upper tank 11 through a feed pipe 5. The waste water 2 supplied to the sprinkler 17 is supplied to an annular oil passage 19 and sprinkled down into the upper tank 11 from plural outlets 21 provided in the periphery of the sprinkler 17. Since an oil-water separation tank 10 is previously filled with water 40 and oil 41, the oil in the sprinkled waste water is formed, aggregated and associated with the oil 41 and separated from the water, and the oil content is increased. When a float 70 is lowered due to the increase of oil, oil discharge pump 30 is actuated by the action of a lead switch 73.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating and recovering an oil content of oil-containing wastewater. In particular, the present invention relates to an apparatus suitable for separating and collecting emulsified oil having an oil content of several% or less.

[0002]

2. Description of the Related Art Separation and recovery of the oil content of oil-containing wastewater is an important issue from the viewpoint of protecting the global environment and also from the viewpoint of effective utilization of resources, that is, reusing the remaining oil content.

Conventionally, as a method for separating oil content of oil-containing wastewater, a method of filtering and separating the oil content with a filter, a method of adsorbing the oil content on a rope or a belt for separation, or a method of decomposing the oil content of the wastewater with bacteria. Is known.

[0004]

However, in the method using a filter, cleaning and replacement work due to clogging of the filter is very troublesome, and there is a problem that the separation ability changes depending on the clogging state. .

The method of adsorbing oil on a rope or belt is also insufficient for adsorbing emulsified oil.

Further, the method using bacteria also requires that the bacteria be controlled in an activated state, and there is a problem that the decomposition is not sufficiently performed under severe environment conditions such as high temperature or low temperature. It was

[0007]

The present invention has been made to solve the above problems, and the oil-water separation device of the present invention is filled with a certain amount of water and oil in advance, and the device is impregnated with oil. It is characterized in that oil water is separated by spraying and dropping waste water.

[0008]

The oil-water separator of the present invention is filled with a certain amount of water and oil in advance, and the oil-containing wastewater is supplied to the apparatus by a pump or the like, and the oil-containing wastewater is sprayed and dropped into the oil-water separator. Then, the oil content in the oil-containing wastewater gathers in the upper part by so-called creaming, and the oil-water separation is performed through the processes of coagulation and coalescence.

When the oil content becomes constant, the sensor works to operate the oil discharge pump, and the oil content is discharged.

[0010]

EXAMPLES The present invention will be described below based on examples.

FIG. 1 is a sectional view of the present invention.

In FIG. 1, 1 is an oil-containing wastewater tank, and 10 is
Is an oil / water separation tank, and 100 is a filter. The filter 100 is used as needed.

The oil / water separation tank 10 is composed of an upper tank 11 and a lower tank 13, and the upper tank 11 and the lower tank 13 can be removed by a flange portion 12,
And it is watertightly assembled. Reference numeral 15 is a support table that supports the oil / water separation tank 10.

The oil / water separation tank 10 is filled with water 40 and oil 41 in advance.

A spraying device 17 is attached to the upper tank 11, a conical wall surface 21 is provided on the upper tank 11, and a wire mesh 23 for preventing foreign matter from entering is provided on the upper surface of the conical wall surface 21. It is installed. Further, the upper tank 11 has an oil sensor 70 and an oil drain pipe 31.
Is attached.

A drain pipe 53 is attached to the lower tank 13 through the teeth 51, and the drain pipe 53 is further attached.
Are fixed to the lower tank by stays 80.

Reference numeral 50 denotes a drain cock for extracting water 40 or the like filled in the inside of the oil / water separator when cleaning the inside. Reference numeral 55 is a safety valve that operates when the oil drainage pump 30 fails.

Next, the operation of the oil / water separator of the present invention having the above-described structure will be described in detail.

Oil-containing wastewater 2 stored in the oil-containing wastewater tank 1
Is sucked by the pump 3 and supplied to the spraying device 17 in the upper tank 11 through the supply pipe 5. The oil-containing wastewater 2 supplied to the spraying device 17 is supplied to the annular oil passage 19 and sprayed and dropped into the upper tank 11 from a plurality of oil-containing wastewater outlets 21 provided on the outer periphery of the spraying device 17. Since the water 40 and the oil 41 are filled in the oil-water separation tank 10 in advance, the oil contained in the oil-containing wastewater that has been dropped and dispersed becomes a foam, and undergoes a process of coagulating and coalescing with the oil 41 previously filled. Oil-water separation is performed and the oil content increases.

Since the height of the drain pipe 53 is constant,
When the amount of separated oil increases and the float 70 moves downward, for example, the reed switch 73 operates the drainage pump 30, and the separated oil is discharged through the drainage pipe 31.

Further, the suction position of the oil drain pipe 31 is set above the float position where the reed switch operates by h, so that the suction of water is prevented.

The float 70 may be made of any material as long as it floats on the oil / water separation boundary surface. In this embodiment, ABS (acrylonitrile / butadiene / styrene) resin is used.

Since the height of the drain pipe 53 is constant, the separated water is automatically discharged from the drain pipe 53.

In the experiment of this embodiment using the oil-containing wastewater containing 10% or less of oil, the residual oil content in the wastewater was 5 ppm or less.

If it is desired to further separate the residual oil, drainage may be performed through the filter 100.

[0026]

As is apparent from the above description, in the present invention, the oil-water separation device is filled with a certain amount of water and oil in advance, and the oil-containing wastewater is sprayed and dropped into the device to separate the oil-water. Therefore, there is an effect that oily water can be reliably separated with a simple device.

Further, it has an effect that it can be used even under severe operating environment conditions.

[0028]

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention.

[Explanation of symbols]

 1 Oil-containing waste water tank 10 Oil-water separation tank 17 Spraying device 30 Oil drain pump 31 Oil drain pipe 40 Moisture 41 Oil component 53 Drain pipe 70 Oil sensor 100 Filter

Claims (3)

[Claims] 1. An oil-water separation device for oil-containing wastewater, characterized in that a predetermined amount of water and oil are filled in the device in advance, and oil-containing wastewater is sprayed and dropped into the device to separate oil-water. 2. A sensor is provided which operates when the oil content reaches a certain amount, and the suction position of the oil drain pipe is set above the operation position of the sensor.
The oil-water separation device of the oil-containing wastewater described. 3. The oil / water separation device according to claim 1, wherein the separated water is drained through a filter.