JPH11267658A - Flocculating and setting device for suspended waste oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a flocculating separation conveniently for subjecting a cutting waste oil to incinerating disposal, etc. SOLUTION: This flocculating and settling device 20 for the suspended waste oil flocculating and separating in a flock shape suspended particles in the suspended waste oil containing oil and water, is provided with a reactive separating device 22 for executing a flocculating reaction with a light calcium carbonate powder, slaked lime or calcium oxide and a flocculating agent charged in a previously prescribed amount and order while stirring the suspended waste oil, plural drawing passages disposed at a side wall of the reactive separating device 22 at height positions differ each other and drawing out a supernatant liq. from the height position selected selectively after finishing the reaction and an aeration tank 25 for ozone-aerating the drawn supernatant liq.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension for flocculating and separating suspended particles in a waste oil in which water and oil such as cutting waste oil in which cutting oil is suspended in water are flocculated. The present invention relates to a coagulation sedimentation apparatus for turbid waste oil.

[0002]

2. Description of the Related Art Aggregation separation is to aggregate fine colloidal dispersed particles suspended in water and separate them from water. Typical inorganic coagulants include aluminum sulfate (so-called sulfuric acid band), and recently, polyaluminum chloride. In addition, since the cohesive strength of the inorganic coagulant is not so large, there is a polymer coagulant having a long chain molecular structure.

[0003] This polymer flocculant is used together with a cationic polymer for the purpose of neutralizing the surface charge of the negatively charged suspended particles and crosslinking, and an inorganic flocculant, and adsorbed between the particles. There is an anionic or nonionic polymer which is cross-linked to increase the floc size. The coagulation separation using these coagulants is performed for 10 ⁻⁷ to 10 ^{−7 of} particles suspended in water.
The fine colloid particles having a particle size in the range of 10 ^-4 cm are neutralized and aggregated.

By the way, there are two types of cutting oil for cooling and lubricating the cutting blade with a cutting machine, such as a water-insoluble cutting oil and an emulsion-type water-soluble cutting oil. Water-soluble cutting oil is often used. The water-soluble cutting oil is diluted with water for use in a cutting machine or the like. After a certain period of use, new cutting oil is introduced, and the disposal of the used cutting oil discarded at that time is a problem at present.

[0005] Since cutting waste oil discharged in each plant is discharged only in small amounts, for example, incineration is the simplest treatment method, but there is a problem that combustion efficiency is poor due to a high water content even in incineration. Further, even in the case of water treatment, there are cases where oil components that cannot be assimilated by activated sludge are contained. Furthermore, since the surfactant is contained, there is also a problem that it is difficult to separate oil and water.

[0006]

SUMMARY OF THE INVENTION The present invention provides a coagulating sedimentation apparatus for suspended waste oil which can be easily subjected to coagulation separation in order to incinerate, for example, cutting waste oil which has conventionally been a problem. The purpose is to:

[0007]

According to a first aspect of the present invention, there is provided a coagulation and sedimentation apparatus for suspended waste oil which flocculates and separates suspended particles in suspended waste oil containing oil and water. In the coagulating sedimentation apparatus for suspended waste oil, a reaction separation for performing a flocculation reaction is performed using light calcium carbonate powder, slaked lime, or quicklime and a flocculant charged in a predetermined amount and in an order while stirring the suspended waste oil. A plurality of tanks and a plurality of extraction pipes are provided at different height positions on the side wall of the reaction separation tank, and the extraction pipe for extracting the supernatant from a selectively selected height position after the reaction is completed. And an aeration tank for aerating the supernatant with ozone.

The coagulating sedimentation apparatus for suspended waste oil according to the second aspect of the present invention includes a dehydrating apparatus for introducing the extracted supernatant according to the first aspect into an aeration tank via a filter cloth. It is provided.

According to a third aspect of the present invention, there is provided a coagulating sedimentation apparatus for suspended waste oil, wherein the supernatant aerated in the aeration tank according to the first or second aspect is discharged out of the apparatus via activated carbon. It is equipped with an activated carbon tank.

According to a fourth aspect of the present invention, there is provided a flocculated sedimentation apparatus for suspended waste oil, which flocculates and separates suspended particles in a suspended waste oil containing oil and water into flocs. A reaction separation tank for performing an agglutination reaction with light calcium carbonate powder, slaked lime, or quick lime and a flocculant charged in a predetermined amount and in an order while stirring the suspended waste oil, and a reaction separation tank A plurality of extraction pipes are provided at different height positions on the side wall to extract a supernatant from a height position selectively selected after the reaction is completed, and ozone aeration is performed on the extracted supernatant. An aeration tank, a dehydrator installed between the extraction pipe and the aeration tank, and introducing the extracted supernatant into the aeration tank via a filter cloth; and a supernatant aerated in the aeration tank. Activated charcoal tank for discharging air outside the apparatus via activated carbon, and the aeration tank A pedestal having a built-in activated carbon tank, wherein the reaction separation tank and the dehydration device are juxtaposed on the pedestal, and at the side of the reaction separation tank, the extraction pipe is desired by the dehydration device from above. Things.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a flocculation reaction is carried out with a light calcium carbonate powder, slaked lime, or quicklime added with a predetermined amount and in a predetermined order while stirring a suspended waste oil and a flocculant. A plurality of reaction separation tanks at different height positions on the side wall of the reaction separation tank, and a discharge pipe for selectively withdrawing the supernatant from a height position selected after the reaction is completed; And an aeration tank for aerating the supernatant obtained with ozone. Thereby, in order to incinerate and discard cutting waste oil, coagulation and separation can be easily performed.

[0012] In the coagulation separation apparatus for suspended waste oil of the present invention, good coagulation and separation were performed even with suspended waste oil containing oil and water.
This is light calcium carbonate dispersed in the sewage that is added to and mixed with the suspended sewage before the addition of the flocculant, which absorbs the fine waste oil particles in the suspended waste oil and adsorbs the fine waste oil particles. It seems that a mechanism of action for coagulating and separating light calcium carbonate with other suspended particles of wastewater has occurred. This light calcium carbonate may be produced from carbon dioxide in suspended waste oil by adding slaked lime or quick lime in addition to commercially available light calcium carbonate powder.

The settled sludge that has settled is dewatered and then incinerated. If the supernatant in which the suspended oil content has settled is in a state where the BOD etc. is higher than the emission standard, after the dilution adjustment, the BOD etc. is reduced by ozonolysis treatment,
Released. In the present invention, since the ozone aeration tank is provided, the supernatant in which the suspended oil has settled can be continuously subjected to ozone aeration. By the ozone aeration, the supernatant which is inclined to the alkaline side with the light calcium carbonate powder, slaked lime or quick lime can be made almost neutral.

In the present invention, it is preferable to provide an activated carbon tank for filtering activated charcoal when discharging the supernatant, in which suspended oil components settled by ozone aeration are settled out of the apparatus, such as discharge, so that treated water below the discharge standard is provided. Can be discharged. The used carbon is preferably washed to extend its service life, and can be used several times to several tens times.

In the present invention, preferably, an aeration tank and an activated carbon tank are arranged inside a pedestal, a reaction separation tank and a dehydrator are arranged side by side on the pedestal, and an extraction pipe is provided on a side wall of the reaction separation tank. The dewatering device is installed at the side of the reaction / separation tank and the drainage pipe is desired from above, so that the flow of treated water flows from above to below, and a compact configuration can be achieved.

More preferably, in order to wash the activated carbon, the washing water obtained by washing the activated carbon is led to an activated carbon washing liquid filtration tank provided between the reaction separation tank and a pedestal (aeration tank) and escaped together with the washing water. The activated carbon is separated in this activated carbon washing liquid filtration tank, and the washing water from which the activated carbon has been filtered can be used as a diluent of the treated water from the next reaction separation tank.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing a processing step of cutting waste oil using a coagulation separation method performed by a coagulation sedimentation apparatus for suspended waste oil of the present invention. As shown in the figure, the cutting waste oil in which the waste oil and water are suspended is left in a storage tank for a predetermined period to settle down natural sediments such as metal powder contained therein. Thereafter, prior to the addition of the flocculant, the flocculation separation of the present invention is carried out by adding and mixing light calcium carbonate powder, slaked lime, or quick lime to the suspended sewage so as to have a predetermined concentration. To settle.

The settled sludge which has settled is dewatered and then incinerated. If the supernatant in which the suspended oil content has settled is in a state where the BOD etc. is higher than the emission standard, after the dilution adjustment, the BOD etc. is reduced by ozonolysis treatment,
Released. If the supernatant in which the suspended oil sedimented falls below the emission standards such as BOD, ozone decomposition treatment is not performed,
It can be released.

FIG. 2 is an explanatory view showing the structure of one embodiment of the coagulation and sedimentation apparatus for suspended waste oil according to the present invention. As shown in the figure, the coagulating sedimentation device for suspended waste oil (20)
A stirring blade (24) rotated by (23) and a reaction separation tank (2) for sequentially charging predetermined light calcium carbonate powder, slaked lime, or quicklime and a flocculant while stirring the suspended waste oil.
2) are installed on a pedestal (26) in which the inside is an ozone aeration tank (25). The effective volume of the reaction separation tank (22) is 50
Liters.

On the side wall of the reaction separation tank (22), four extraction pipes (27) are formed at different heights, and each extraction pipe is provided with a valve (28). . Extraction piping (27)
A dewatering box (29) for holding a bag (40) made of filter cloth is provided downstream of the
At the bottom of (29), a conduit (30) leading to the ozone aeration tank (25) inside the pedestal (26) is provided. Note that washing water for washing the reaction separation tank (22) is supplied from a water supply pipe (31) such as tap water.

The treated water in the ozone aeration tank (25) is blower
Air from (35) is blown into the pipe (36) through the ozone generator (32) to perform ozone treatment. Ozone aeration tank
(25) is provided with a liquid level meter (38) for observing the liquid level in the ozone aeration tank. The effective volume of the ozone aeration tank (25) is 200 liters.

The treated water which has been subjected to the ozone treatment in the ozone aeration tank (25) is transferred to an activated carbon tank (34) by a discharge pump (37). It is discharged outside. Wash water from a water supply pipe such as tap water is supplied to the activated carbon tank (34) from the water supply pipe (44) into the activated carbon tank (34) to wash the activated carbon. The washing water after washing the activated carbon,
Activated carbon washing liquid filtration tank (4
While filtering the activated carbon carried by the washing water in 1), the conduit (4
From 2), it accumulates in the ozone aeration tank (25).

The water-soluble cutting waste oil stored in the existing storage tank (21) was introduced into the reaction separation tank (22). In the storage by the storage tank (21), large metal powder mixed in the cutting or the like settles. In addition, it is better to adjust the water content of the water-soluble cutting waste oil introduced into the reaction separation tank (22) to be constant.
This is preferable because the labor for adjusting the amount of the drug or the like to be injected later can be omitted. In this example, the cutting oil was adjusted to a concentration diluted 20 times.

The cutting waste oil introduced into the reaction separation tank (22) is stirred by a stirring motor (23) rotating a stirring blade (24). First, 50 g of slaked lime is put into 10 liters of the cutting waste oil in the well-stirred cutting waste oil.
60 minutes later, 60 cc of an inorganic flocculant (polyaluminum chloride)
Similarly, after 2 to 3 minutes, 70 cc of a weakly anionic polymer flocculant (trade name "Diafloc AP410H" manufactured by Diafloc Co., Ltd.) was added.

After charging the last polymer flocculant, 2-3
After a minute, the stirring was stopped and the mixture was allowed to stand still, whereby the cloudy cutting waste oil was separated into a clear supernatant and settled sludge. When the upper surface of the settled sludge is sufficiently lower than the extraction pipe (27), the supernatant is discharged from the upper extraction pipe (27) by opening the valve (28). The discharged supernatant is introduced into a bag (40) made of a filter cloth in a dehydration box, and the exuded supernatant is transferred to a conduit (3).
After passing through 0), it is discharged into the ozone aeration tank (25).

The treated water sufficiently aerated in the ozone aeration tank (25) confirms that the BOD value and the like have fallen below the discharge standard, and drives the discharge pump (37) to remove the activated carbon tank (34). Through the discharge path (39). The used activated carbon is drained (3
Close the 9), open the valve (43) and pour the washing water into the activated carbon tank.
The washing water that is introduced into (34) and escapes is the activated carbon washing treatment pipe (3
It is returned from the activated carbon washing liquid filtration tank (41) to the aeration tank (25) via the conduit (42) via 3). The washing water obtained by washing the activated carbon is used as a diluent of the treated water from the next reaction separation tank (22). The activated carbon that has escaped together with the washing water through the activated carbon washing treatment pipe (33) is separated in the activated carbon washing liquid filtration tank (41).

During the ozone aeration, a filter cloth is installed in the activated carbon washing liquid filtration tank (41) or the dehydration box (29) while aerating water is circulated by a circulation pump so as to remove suspended matter of the aeration water. You may comprise. In this case, the circulation pump may also serve as the discharge pump (37).

Table 1 shows the data of the processing experiments in the coagulating sedimentation apparatus for suspended waste oil of the present invention. As shown in Table 1, a solution waste suspension and an emulsion suspension waste were used as the treatment stock solutions used.

[0029]

[Table 1]

[0030]

As described above, according to the present invention, the flocculation reaction is carried out with the light calcium carbonate powder, slaked lime, or quick lime and the quicklime added in a predetermined amount and in a predetermined order while stirring the suspended waste oil. A plurality of reaction separation tanks at different height positions on the side wall of the reaction separation tank, and a discharge pipe for selectively withdrawing the supernatant from a selected height position after the reaction is completed; Since it is provided with an aeration tank for aeration of the extracted supernatant with ozone, there is an effect that aggregation and separation can be easily performed in order to incinerate and discard cutting waste oil.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a processing step of cutting waste oil using a flocculation separation method performed by a flocculating sedimentation apparatus for cutting waste oil of the present invention.

FIG. 2 is an explanatory view showing a configuration of an embodiment of a coagulating sedimentation apparatus for cutting waste oil of the present invention.

[Explanation of symbols]

 (20)… Coagulation and sedimentation equipment for suspended waste oil, (21)… Storage tank, (22)… Reaction separation tank, (23)… Stirring motor, (24)… Stirring blade, (25)… Ozone aeration tank, ( 26) Base, (27) Extraction pipe, (28) Valve, (29) Dehydration box, (30) Pipe, (31) Water supply pipe, (32) Ozone generator, (33) … Activated carbon cleaning treatment piping, (34)… Activated carbon tank, (35)… Blower, (36)… Piping, (37)… Discharge pump, (38)… Liquid level system, (39)… Discharge path, (40) ... bag, (41) ... activated carbon washing liquid filtration tank, (42) ... conduit, (43) ... valve, (44) ... water supply pipe,

Claims (4)

[Claims] Claims: 1. An agglomerated sedimentation apparatus for waste oil, which flocculates and separates suspended particles in suspended waste oil containing oil and water, in a predetermined amount and in a predetermined order while stirring the suspended waste oil. A reaction separation tank for performing a coagulation reaction by the light calcium carbonate powder, slaked lime, or quicklime and the coagulant, and a plurality of reaction separation tanks are installed at different heights on the side wall of the reaction separation tank, and after the reaction is completed. A coagulating sedimentation apparatus for suspended waste oil, comprising: an extraction pipe for extracting the supernatant from a selectively selected height position; and an aeration tank for aerating the extracted supernatant with ozone. . 2. The coagulating sedimentation apparatus for suspended waste oil according to claim 1, further comprising a dehydrator for introducing the extracted supernatant into an aeration tank via a filter cloth. 3. The coagulating sedimentation apparatus for suspended waste oil according to claim 1, further comprising an activated carbon tank for discharging the supernatant aerated in the aeration tank to outside of the apparatus via activated carbon. . 4. A flocculating sedimentation apparatus for suspended waste oil which flocculates and separates suspended particles in suspended waste oil containing oil and water in a predetermined amount and in a predetermined order while stirring the suspended waste oil. A reaction separation tank for performing a coagulation reaction by the light calcium carbonate powder, slaked lime, or quicklime and the coagulant, and a plurality of reaction separation tanks are installed at different heights on the side wall of the reaction separation tank, and after the reaction is completed. An extraction pipe for extracting the supernatant from a selectively selected height position, an aeration tank for aerating the extracted supernatant with ozone, and a drain pipe installed between the extraction pipe and the aeration tank. A dehydration device that introduces the extracted supernatant into an aeration tank via a filter cloth; an activated carbon tank that discharges the supernatant aerated in the aeration tank to outside of the apparatus via activated carbon; and the aeration tank. A pedestal having a built-in activated carbon tank, The reaction and separation vessel and the dewatering device is juxtaposed, the reaction separation tank the evacuation pipe the dewatering device suspended waste oil for coagulating sedimentation apparatus characterized by wants from above at the side of the.