JPH10174802A - Simple oil-water separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the separation of oil in an oil separator and to reduce the maintenance cost by naturally separating oil and water and utilizing a sensor for detecting the lower face of a floating oil layer, an oil discharge valve and a water discharge valve to previously remove the floated oil. SOLUTION: The raw water 2 is introduced into a water storage tank main body 11 by a raw water pump 12 in stage (a), and the supply of the raw water 2 to the main body 11 is stopped by the signal of a raw water pump stop sensor 13 in stage (b). The raw water is allowed to stand for a specified time in stage (c), and a water discharge valve 18 is opened in stage (d). The oil layer is detected by a sensor 16 for detecting the lower face of the oil layer, the water discharge valve 18 is closed in stage (e), and an oil discharge valve 17 is opened to discharge the oil floated on the water surface of the main body 11 into an oil separator in stage (f). The oil discharge valve 17 is closed after a specified time in stage (g), and then stages (a) to (g) are repeated. When the water level is lowered to a specified level from the brim, the water discharge valve 18 is closed, stages (f) and (g) are skipped, and the discharge of water from the water discharge valve 18 can be increased by repeating stages (a) to (f) n times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to an apparatus for separating waste water having a high oil concentration. More specifically, the present invention relates to a simple oil-water separation device which is inexpensive, can reduce maintenance cost, and has high oil removal efficiency.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view of the configuration of a conventional example generally used in the past. For example, catalog name; wastewater treatment engineering P6, date of issue: November 1992,
Issuing office: Toray Engineering Co., Ltd.

In FIG. 4, reference numeral 1 denotes a raw water tank into which raw water 2 composed of, for example, a waste liquid mixed with oil is introduced. Due to the nature of the waste liquid, it is difficult to continuously maintain a constant flow rate of the raw water 2. Reference numeral 3 denotes a raw water pump that draws raw water 2 from the raw water tank 1. Reference numeral 4 denotes an oil separator for separating oil from the raw water 2 pumped by the raw water pump 3. in this case,
Oil separation masu is used.

In the above configuration, the raw water 2 is temporarily stored in the raw water tank 1 and then pumped out by the raw water pump 3.
The oil is separated by the oil separator 4.

[0005]

However, in such an apparatus, the raw water 2 is pumped out by the raw water pump 3 and supplied to the oil separator 4. In this case, the oil content is sufficiently stirred and refined by the raw water pump 3,
The oil separation efficiency in the oil separator 4 deteriorates.

In addition, since all the oil flows into the oil separator 4, the frequency of replacement of the oil filter and the like, cleaning of the inside of the oil separator 4, etc. increases, and maintenance of the oil separator 4 is difficult. Maintenance costs increase. In particular, in the case of the waste water 2 having a high oil concentration, the maintenance cost is further increased.

In some cases, the raw water tank 1 is not provided. In this case, due to the nature of the waste liquid, the raw water 2 may not be supplied to the oil separator 6 sufficiently continuously. Is further reduced. The present invention solves these problems.

An object of the present invention is to provide a simple oil-water separation apparatus which is inexpensive, can reduce maintenance cost, and has high oil removal efficiency.

[0009]

In order to achieve this object, the present invention provides: (1) a simple oil / water separator in which raw water flows into a water storage tank; A raw water pump for flowing raw water into the water tank main body, a raw water pump stop sensor provided on the upper side of the water tank main body to detect near fullness of the raw water and stop the raw water pump, and a predetermined position of the water tank main body. An oil layer lower surface detection sensor provided to detect the lower surface of an oil layer naturally separated from raw water, an oil discharge valve provided in a water tank main body located above the oil layer lower surface detection sensor, and a lower position than the oil layer lower surface detection sensor A simple oil-water separator, comprising: a water discharge valve provided in a water storage tank main body. (2) The simple oil-water separator according to claim 1, further comprising a water tank main body of an open-to-atmosphere type. (3) The simple oil-water separation device according to claim 1, further comprising a sediment prevention plate provided on a bottom surface of the raw water inflow portion in the water tank main body to prevent sediment from flowing out. It is what constituted.

[0010]

In the above configuration, the following operation steps are performed. (A) Raw water is taken into the water tank body by the raw water pump. (B) Stopping the intake of the raw water into the water tank main body according to the signal of the raw water pump stop sensor.

(C) Leave for a predetermined time. (D) Open the water discharge valve. (E) The water discharge valve is closed by detecting the oil layer by the oil layer lower surface detection sensor.

(F) Open the oil discharge valve and discharge the oil floating on the water surface of the water tank main body to the oil separator. (G) After a predetermined time, the oil discharge valve is closed. Thereafter, the steps (a) to (g) are repeated. Hereinafter, a detailed description will be given based on embodiments.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a main part of an embodiment of the present invention, FIG. 2 is an example of use of FIG. 1, and FIG. 3 is an operation explanatory diagram of FIG. In the figure, the configuration of the same symbol as FIG. 4 represents the same function. Hereinafter, only differences from FIG. 4 will be described.

In FIG. 1, reference numeral 11 denotes a water tank main body into which raw water 2 flows. Reference numeral 12 denotes the raw water 2
Is a raw water pump. 13 is a water tank main body 11
The raw water pump stop sensor is provided on the upper side of the raw water pump and detects that the raw water 2 is almost full and stops the raw water pump 12.

Reference numeral 14 denotes a full water detection sensor provided on the water tank main body at a position higher than the raw water pump stop sensor 13. Reference numeral 15 denotes an overflow pipe provided in the water tank main body at a position above the full water detection sensor 14.

Reference numeral 16 denotes an oil layer lower surface detection sensor which is provided at a predetermined position of the water tank main body 11 and detects the lower surface of the oil layer naturally separated from the raw water 2. In this case, the detection is performed by the electric conductivity or the capacitance. 17 is an oil layer lower surface detection sensor 16
It is an oil discharge valve provided in the water tank main body 11 at a higher position.

Reference numeral 18 denotes a water discharge valve provided in the water tank main body 11 at a position lower than the oil layer lower surface detection sensor 16.
19 is a sediment prevention plate provided in the water tank main body 11. A is a waste oil container connected to the oil discharge valve 17 and stores an oil layer B generated in the water tank main body 11, as shown in FIG. In this case, a drum is used.

Reference numeral C denotes an oil separator connected to the water discharge valve 18, as shown in FIG. 2, for separating oil from a raw water layer D generated below an oil layer B generated in the water tank main body 11. In this case, a specific gravity difference separator is used. E settled at the lower part of the water tank main body 1 by being blocked by the sediment prevention plate.
Solids and sediments.

In the above configuration, the following operation steps are performed as shown in FIG. (A) The raw water 2 is supplied by the raw water pump 12 to the water tank main body 11.
Take in. (B) According to the signal of the raw water pump stop sensor 13, the raw water 2
Is stopped in the water tank main body 11.

(C) Leave for a predetermined time. In this case, it is left for about 30 minutes. The standing time is determined in consideration of the degree of stirring of the raw water 2 and the like. (D) Open the water discharge valve 18. (E) By detecting the oil layer B by the oil layer lower surface detection sensor 16,
The water discharge valve 18 is closed.

(F) The oil discharge valve 17 is opened and the water tank main body 1 is opened.
The oil floating on the water surface of No. 1 is discharged to the oil separator C. (G) After a predetermined time, the oil discharge valve 17 is closed. In this case, it depends on the timer setting. Thereafter, the steps (a) to (g) are repeated.

The water drainage speed of the water tank main body 11 decreases as the water level decreases due to the water pressure. Therefore, it takes time to release all raw water. On the other hand, as shown in FIG. 3, when a predetermined water level is reached from the full state, the water discharge valve 18 is closed, the oil discharge steps (f) and (g) are skipped, and (a) to (e). The process is repeated n times to increase the amount of water discharged from the water discharge valve 18. The specific number of n times is determined by the oil content of the raw water 2 and the capacity of the oil separator C.

In this way, the processing capacity of the present simple oil / water separator can be improved. Specifically, in this case, a timer is set so that the water discharge valve 18 is closed at a 2/3 position from the full state.

Even if a change occurs such that the oil content of the raw water 2 suddenly increases, the oil layer lower surface detection sensor 16 operates,
Since the oil discharging operation starts, no problem occurs.

As a result, (1) the floating oil in the raw water is naturally separated using the water tank main body 11, and the floating oil layer lower surface detection sensor 16 and the oil discharge valve 1
7 and the water discharge valve 18, the floating oil is efficiently removed in advance, so that the burden of separating the oil in the oil separator C is reduced and the maintenance cost can be reduced. Is obtained.

In particular, in the case of the raw water 2 having a high oil concentration, a simple oil-water separation device which can further reduce the maintenance cost can be obtained.

(2) Since the supply of the raw water 2 from the water tank main body 11 to the oil separator C is caused by natural flow, the oil content is not agitated and may not be fined. A simple oil-water separator capable of improving efficiency can be obtained.

(3) When a new oil-water separation system is installed,
Due to the nature of the raw water 2, the raw water 2 may not be able to be continuously and sufficiently supplied to the oil separator C, and the efficiency of the oil separator C is reduced. Therefore, the raw water tank 1 is required. If there is an oil / water separator, the raw water tank 1 becomes unnecessary and has a simple oil / water separation function, so that a simple oil / water separator capable of reducing the equipment cost of the entire system can be obtained.

(4) When the water tank main body 11 is of the open-to-atmospheric type, as the water level decreases, the water pressure becomes smaller depending on the water pressure.
Drainage speed decreases. On the other hand, the oil content increases as the water level decreases, but the drainage speed decreases, so that the extra time given to oil separation increases, and as a result, the separation of oil and water can be promoted, and the efficiency can be improved. A good simple oil-water separator can be obtained.

(5) When the water tank main body 11 is of the open-to-atmospheric type, if the oil content of the oil separator C increases, the processing speed of the raw water 2 decreases. On the other hand, the oil content increases as the water level decreases, but the drainage speed decreases. That is, since the speed of supplying the raw water from the water tank main body 11 to the oil separator C is also reduced, a simple oil / water separator capable of obtaining a balance, efficiently driving the oil separator C, and reducing the oil / water separation cost as a whole system. Is obtained.

(6) When the sediment prevention plate 19 is provided, solids and sediments in the raw water are removed in advance.
There is no danger of lowering the efficiency of the oil separator C configured to be suitable for oil removal, and a simple oil / water separator that can reduce oil / water separation costs as a whole system can be obtained.

[0032]

As described above in detail, according to the first aspect of the present invention, (1) the floating oil component in the raw water is naturally separated using the water tank main body, and the floating oil layer lower surface detection sensor and the oil are separated. By using the discharge valve and the water discharge valve to remove the floating oil efficiently in advance, a simple oil-water separator that can reduce the burden of separating oil in the oil separator and reduce maintenance costs. can get.

In particular, in the case of raw water having a high oil concentration, a simple oil-water separation device capable of further reducing the maintenance cost can be obtained.

(2) Since the supply of raw water from the water storage tank body to the oil separator is caused by natural flow, the oil content is not agitated and may not be fined, so that the oil separation efficiency in the oil separator can be improved. A simple oil-water separator can be obtained.

(3) When newly installing an oil-water separation system,
Due to the nature of raw water, it may not be possible to supply the raw water to the oil separator continuously and sufficiently, and the efficiency of the oil separator will decrease.
Although a raw water tank is required, the simple oil / water separator according to the present invention eliminates the need for the raw water tank and has a simple oil / water separation function, so that a simple oil / water separator capable of reducing the equipment cost of the entire system can be obtained. .

According to the second aspect of the present invention, (1) when the water storage tank body is of the open-to-atmospheric pressure type, the drainage speed decreases as the water level decreases due to the water pressure. On the other hand, the oil content increases as the water level decreases. However, since the drainage speed is reduced, a margin time given to oil separation is increased, and as a result, the separation of oil and water can be promoted, and a simple oil and water separation device with good oil and water separation efficiency can be obtained.

(2) In the case where the main body of the water storage tank is of the open-to-atmospheric type, if the oil content of the oil separator increases, the processing speed of raw water decreases. On the other hand, the oil content of the raw water increases as the water level decreases, but the drainage speed decreases. That is, since the speed of supplying raw water from the water tank main body to the oil separator is also reduced, a simple oil / water separator can be obtained which can balance the oil, efficiently drive the oil separator, and reduce the oil / water separation cost as a whole system. .

According to the third aspect of the present invention, when the sediment prevention plate is provided, the solids and sediments in the raw water are removed in advance, so that the structure is suitable for removing oil. There is provided a simple oil / water separator which can reduce the oil / water separation cost of the entire system without fear of lowering the efficiency of the oil separator.

Therefore, according to the present invention, it is possible to realize a simple oil-water separator having a low maintenance cost and a high oil removing efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an example of use of the present invention.

FIG. 3 is an operation explanatory diagram of FIG. 1;

FIG. 4 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw water tank 2 Raw water 11 Reservoir main body 12 Raw water pump 13 Raw water pump stop sensor 14 Full water detection sensor 15 Overflow pipe 16 Oil layer lower surface detection sensor 17 Oil discharge valve 18 Water discharge valve 19 Sediment prevention plate A Waste oil container B Oil layer C Oil separation Machine D Water tank E Sediment

Claims (3)

[Claims] 1. A simple oil / water separator in which raw water flows into a water tank, a water tank body into which the raw water flows, a raw water pump through which raw water flows into the water tank body, and an upper side of the water tank body. A raw water pump stop sensor that is provided in the raw water pump and detects the near fullness of the raw water to stop the raw water pump, and an oil layer lower surface detection sensor that is provided at a predetermined position of the water tank main body and detects the lower surface of an oil layer that is naturally separated from the raw water. An oil discharge valve provided on the water tank main body located above the oil layer lower surface detection sensor; and a water discharge valve provided on the water tank main body below the oil layer lower surface detection sensor. Simple oil-water separator. 2. The simple oil / water separator according to claim 1, further comprising a water tank main body of an open-to-atmosphere type. 3. The simple oil / water separator according to claim 1, further comprising a sediment prevention plate provided on a bottom surface of the raw water inflow portion in the water tank main body to prevent sediment from flowing out.