JP2001314849A - Vacuum distillation type waste liquid treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive high performance vacuum distillation type waste liquid treatment apparatus using no chemical agent and capable of being arranged on a line side in a factory and enabling continuous treatment. SOLUTION: A waste liquid is circulated to a vacuum distillation apparatus (2) by a liquid drop nozzle (15) and a waste liquid circulating device (3), and the floated waste liquid and floated gas are automatically separated and recovered during circulation by a floated gas and waste liquid separation and recovery apparatus (4) and a sedimented waste liquid is automatically separated and recovered by a sludge recovery device (8) to be deodorized by a photocatalytic silica gel. An installation place of the vacuum distillation type waste liquid treatment apparatus can be set freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the treatment of waste liquid generated in various production processes.

[0002]

2. Description of the Related Art Conventionally, a vacuum distillation method has been used as one of methods for treating waste liquid generated in various production processes.
The vacuum distillation method has the following problems. Various equipment of a vacuum system for evacuating to a vacuum is required, which increases equipment and maintenance costs. The equipment requires constant maintenance to keep it confidential. Since heat transfer does not go smoothly in a vacuum,
The boiling phenomenon is difficult to use, requiring a large heat transfer area and a large temperature difference. In order to lower the condenser temperature, a cooling device is required. Due to these problems, the system equipment and its auxiliary equipment become large-scale, and the equipment cost is high, the equipment area is large, and the maintenance and automatic control of the equipment are complicated. It is difficult to reduce the size, and continuous processing cannot be performed, resulting in batch processing. The batch processing time is prolonged and the processing efficiency is not good, and the range of use in waste liquid processing is limited. We filed an application number, Japanese Patent Application No. Hei 11-376553, and a vacuum distillation type waste liquid treatment that can be installed on the line side of a production facility in a factory and that enables continuous processing. Although the present invention was able to reduce the size with higher efficiency than before, a vacuum distillation type waste liquid treatment apparatus which blows out mist from a nozzle provided at the waste liquid inlet of the vacuum distillation tank (21) to dramatically increase the evaporation surface area. We set as and filed. The nozzle is clogged when the viscosity of the waste liquid is high or the concentration of the waste liquid is high because the nozzle sprays out in the form of a mist. There were restrictions.
Further, waste liquid having a specific gravity lower than that of water and containing many components tends to accumulate, so that there are restrictions on the types of waste liquid that can be treated. Although the size was reduced in Japanese Patent Application No. Hei 11-376553, if the in-line installation was attempted next to the production equipment in the factory, the empty space was very small in many places. Some plants have large volumes besides the amount, and it is necessary to increase the distillation efficiency.

[0003]

The vacuum-distillation-type waste liquid treatment apparatus does not use chemicals unlike chemical treatment, and therefore has a feature that sludge to be discarded after treatment is extremely small. In addition, since there is no mixing of chemicals, there is no sludge that increases excessively. I can say. Enables continuous batch processing. Further increase wastewater treatment efficiency and reduce size. The odor and the ambient temperature of the equipment are suppressed, so that the equipment can be installed freely anywhere on the production line side of the factory. The corresponding patent is filed in Japanese Patent Application Hei 11
-376553-Vacuum distillation system waste liquid treatment device has been filed. Based on this, continuous processing can be performed instead of batch processing. Increase the discharge rate of the nozzle that allows the waste liquid to flow into the vacuum distillation tank. Further increase wastewater treatment capacity. Further increase the thermal efficiency of heating. Increase the efficiency of vacuum distillation gas condensation. In Japanese Patent Application No. 11-376553, continuous recovery of a floating waste liquid that was not sufficient was performed. And so on.

[0004]

FIG. 1 is an overall block diagram showing functional blocks of a vacuum distillation type waste liquid treatment apparatus according to the present invention, in which block units are grouped. Arrows indicate the flow in the pipe between the partial devices. The waste liquid is sent from the waste liquid insertion device (1) to the vacuum distillation device (2) in Japanese Patent Application No. 11-3.
In 76553, it was misted with a small-diameter nozzle,
Spray out droplets with a large-diameter nozzle. A heater is provided before the nozzle blows out, and the waste liquid is heated and blown out in the form of droplets. The waste liquid accumulated under the vacuum distillation device (2) is repeatedly circulated by the waste liquid circulation device (3), thereby discharging and circulating droplets from nozzles. A floating gas waste liquid separation / recovery device (4) is provided in the path of the waste liquid circulation device (3) to separate the recirculation of separated floating gas and a tank for separating and recovering the floating floating liquid. The floating waste liquid is continuously taken out by the two tanks. An integrated floating waste liquid recovery device (6) is provided in the path of the waste liquid circulation device (3), and the floating waste liquid and the distillation gas are separated and continuously taken out. Distilling gas that floats is provided with a distillation gas circulation nozzle (44) below the waste liquid stored in the vacuum distillation device (3), and is circulated and inserted from the nozzle while bubbling. Sludge settling in the vacuum distillation apparatus (2) is disclosed in Japanese Patent Application No. 11-3 / 1999.
It is continuously taken down while being concentrated by the sludge collecting device (8) described in 76553. Vacuum suction device (9)
Is mounted on a vacuum pump described in Japanese Patent Application No. 11-376553 and a deodorizing column is opened to the atmosphere. As a result, the distillation performance of the vacuum distillation type waste liquid treatment equipment has been dramatically improved, the size has been reduced, the thermal efficiency has been increased, the properties of the waste liquid have not been limited, and the facility processing has been reduced, the installation area has been reduced, and continuous processing has been enabled. Things. As in Japanese Patent Application No. Hei 11-376553, an exhaust port, an exhaust deodorizing column, and a condensed water deodorizing column at the wastewater port are provided so that they can be installed on the production line side without deteriorating the work environment. is there. Hereinafter, the details of each block of the apparatus will be described.

[0005] As shown in FIG. 2, a waste liquid insertion device (1)
Is a valve 1 (1) provided in the waste liquid insertion hopper (11).
2) Insert continuously with the waste liquid float (13) while controlling the liquid level of the waste liquid constantly. Thus, the waste liquid supernatant is continuously taken out by the floating gas waste liquid separation / recovery device (4), or the integrated floating material waste liquid recovery device (6) and the sludge that has settled down by the sludge recovery device (8), and the amount of the reduced waste is reduced. The waste liquid in the vacuum distillation apparatus (2) is supplied while controlling the liquid level, and the vacuum distillation system waste liquid processing apparatus can be continuously operated.

When the waste liquid of the vacuum distillation apparatus (2) is inserted into the vacuum distillation tank (21) as shown in FIG.
A droplet nozzle (15) is provided to form a droplet. At this time, in order to prevent the liquid waste in the form of droplets from being sucked into the vacuum circuit, a cut-off plate (16) is provided so that the waste liquid and the waste liquid are collided, and the waste liquid is separated from the vacuum distillation tank (21 )
To the bottom.

[0007] As the vacuum pressure is reduced, the vapor pressure equilibrium is reached and no evaporation occurs, and the change in the reduced pressure promotes the evaporation during the vacuum pressure reduction process. Conventionally, evaporation from the liquid surface of the waste liquid has been performed, and the diameter of the vacuum vessel has been increased in order to increase the evaporation area, which has been a factor of increasing the size of the equipment. The vacuum distillation performance can be improved by taking in the change in vacuum pressure. Japanese Patent Application No. 11-3765 discloses a process for changing the reduced pressure, which facilitates vacuum evaporation, into a waste liquid treatment apparatus and expanding the vacuum contact surface area of the waste liquid.
At 53, the distillation efficiency was increased by atomization. Depending on the type of the waste liquid, there are a viscous substance, a substance with a large amount of foreign substances, a substance with a large foreign substance size, and the like. Since the diameter of the nozzle was reduced to 0.3-1.5 mm in order to form a mist, the nozzle was easily clogged, the discharge amount from the nozzle was limited, and there was a restriction in increasing the processing capacity. By increasing the diameter of the nozzle and using coarser droplets than the mist, the nozzle can be prevented from clogging, and can be widely used for waste liquid in various states. The droplet spreads on a vertical surface in the traveling direction when ejected from the nozzle opening. If there is an obstacle that causes the expanded waste liquid to collide between the parallel and vertical directions, the resulting droplets can be formed into droplets without any problem, although there are some sizes. (Fig. 3)
As shown in 5), a simple nozzle having a slit, a wire mesh, and a large number of holes may be used as the parallel obstacle (18) or the vertical obstacle (19). By increasing the nozzle diameter (17) depending on the state of the waste liquid, the mist tends to become droplets, and the nozzle shape and nozzle diameter can be freely selected according to the properties of the waste liquid. The state in which the distillation ability by discharging the droplet from the nozzle was tested is shown below. The nozzle shape is such that the nozzle diameter (17) of the droplet nozzle (15) is 5
A slit of mm was selected, and 5,000 cc of room temperature water was distilled under vacuum in a 50 liter vacuum distillation apparatus. Conventional method 15 minutes 12 seconds Mist discharge of Japanese Patent Application No. 11-376553 12 minutes 16 seconds Appropriate liquid discharge of the slit-shaped droplet nozzle 11 minutes 48 seconds As a result, the time for discharging from the droplet nozzle was not measured. However, the ejection was completed earlier. After that, it is produced by evaporating the liquid level into the liquid from below as in the prior art. Ejection from the droplet nozzle increases the evaporation efficiency by about 20%. This means that 20% of the liquid is discharged from the droplet nozzle in a very short time, and the efficiency is extremely high. Therefore, if the ejection from the droplet nozzle is repeated, the distillation efficiency will be remarkable. In the conventional method, in order to increase the efficiency, a device for increasing the surface area in contact with vacuum is devised, but in principle, distillation is performed from the liquid surface. In terms of surface area, mist is 1,000 c faster than droplets
Although it was thought that the condensed water of c accumulated, the result was slightly better for the droplets. This is because even if the droplet is discharged from the nozzle, the pressure is rapidly reduced in the vacuum distillation tank (21), so that the decompression bubbling is obtained not only from the surface of the droplet but also from the inside of the droplet due to a change in the reduced pressure due to the discharge. The distillation amount was slightly larger than the mist-like distillation performance in which the surface area was large.

The saturated vapor pressure depends on the temperature, and the higher the temperature, the higher the saturated vapor pressure and the easier the vaporization. If the temperature of the waste liquid is heated by the waste liquid heater (14) to raise the temperature of the droplet before the droplet is blown out from the droplet nozzle (15), the distillation efficiency is improved. The waste liquid heater (14) surrounds the pipe with a heat insulating material, and heats the space between the pipe and the heat insulating material by passing a heater source gas, high-temperature steam, and the like. The heating length of the waste liquid heater (14) is set so as to obtain a temperature under conditions that facilitate distillation depending on the type and properties of the waste liquid. In this case, when a heating gas such as gas or high-temperature steam is used, a portion close to the droplet nozzle (15) is used as an inlet of the heating gas and is heated vertically by an ascending airflow.
When released from the upper side, a high heating effect can be obtained without waste. A graph showing the evaporation effect of the temperature of the waste liquid from the droplet nozzle (15) depending on the temperature is shown in (Test Example-1). The test method was as follows: 30 liters of tap water was placed in a 50 liter vacuum distillation vessel, and the periphery of the test vacuum distillation vessel was heated by an electric heater. 17) The space of the nozzle was set to 5 mm, a space was formed between the pipe and the heat insulating material, and the amount of water accumulated in the condenser in one hour was measured while heating with propane gas.
In an actually set test, the limit was 75 degrees due to the relationship between the amount of tap water flowing, the heating capacity of propane gas, and the heating capacity of the electric heater, and it was difficult to increase it further. As a result, the amount of water condensed is low in low places below room temperature, and as the temperature increases, the tap water temperature does not rise unless the heating capacity of the waste liquid heater (14) is made very large, and the gradient seen in the graph has a tight gradient. It was found that there was an efficient part at about 35-60 degrees. The graph of the amount of condensed water that accumulates as the heating temperature increases increases.The heater requires a larger capacity, the heating time is reduced, and the distillation gas temperature increases, making it difficult to condense. Gets worse.
In addition, when the temperature of the cutting waste liquid was raised to 70 ° C and vacuum distillation was performed, the smell became very strong, and the waste liquid was discolored or partially solidified to maintain a good liquid state. It was difficult. From this, there is an appropriate treatment temperature depending on the type of the waste liquid, and one which is too high has a problem. Since the properties, concentration, viscosity, etc. of the waste liquid to be treated are not constant, the conventional batch treatment in which the waste liquid is collected under a vacuum distillation tank (21) and vacuum distilled is too unstable to control with a fixed control width. The case comes out. Even in such a case, since the droplet nozzle (15) can obtain distillation from the droplet surface and internal foaming, the droplet discharge state can be easily changed by the nozzle diameter (17) or the shape of an obstacle to collide. Or control it.

[0009] Discharge separation of the droplet nozzle (15) and Japanese Patent Application No.
The sludge settled by concentration by the heater of the same sludge collection device (8) as that of 1-376553 is collected, but the floating waste liquid having a small specific gravity relative to the distillation gas rises. The hood (31) having the hood inclined (32) from above the waste liquid level to a pipe portion connected to the waste liquid circulation pump (33) as in the waste liquid circulation device (3) of FIG. 4 (FIG. 4). , And aspirate with a waste liquid circulation pump (33). At this time, the waste liquid float (13) on the surface of the waste liquid is controlled between slightly below the hood (31) and the height of the inlet of the waste liquid circulation pump (33), so that the floating waste liquid rises and has a high concentration. The liquid is sucked from the upper side by the waste liquid circulation pump (33).
While separating and recovering the floating waste liquid by the floating gas waste liquid separation and recovery device (4) or the integrated floating material separation and recovery device (6), the separated waste liquid is separated between the valve 1 (12) and the waste liquid heater (14). It is connected to a pipe and discharged from the droplet nozzle (15) to circulate. By circulating, the number of times the same waste liquid is vacuum-distilled as droplets increases, and the efficiency increases. Waste liquid insertion device (1) for the amount of floating waste liquid and sludge removed after waste liquid treatment
And concentration of waste liquid that is automatically supplied from
Even if the viscosity changes, the operation can be performed irrespective of the selection of the nozzle diameter (17) and the parallel obstacle (18) / vertical obstacle (19). The only difference is that the processing speed is changed. If the processing speed becomes slower, the capacity of the waste liquid circulation pump (33) is increased to increase the number of times the waste liquid is circulated. The capacity of vacuum evaporation by circulation is shown in a graph (Test Example-2). The test method was a vacuum distillation tank (2
30 liters of tap water is put into 50 liters volume of 1), and the circulating pump capacity is 2 liters per minute. The waste liquid heater (23) is heated with gas so that the temperature at the pipe outlet becomes 50 degrees. The firepower was adjusted. The amount of distillation was measured by measuring the amount of condensate that had condensed and accumulated. As a result, when circulating 30 liters of water and performing vacuum distillation, it was expected that the throughput would gradually decrease because the first 30 liters would gradually decrease. The result is that the 2 liter circulation pump makes one cycle of 30 liters in 15 minutes, and an average of 4.1 liters of vacuum distillation per cycle has resulted in an almost constant throughput. The reason why the amount of distillation from the droplet nozzle in (Test Example-1) is larger than about 1.4 liters is that the droplet comes out once, and after that, it is distilled from the liquid level collected below. This is the difference between continuous discharge of droplets, and discharge by droplets has very good distillation efficiency. This indicates that the amount that can be distilled is determined by the amount of water that passes through the droplet nozzle (15), and that the amount that can be treated is constant if the amount of water that passes is constant. In other words, the results show that the distillation amount increases in proportion to the number of circulations and the passage amount of the droplet nozzle ((15) increases.) Naturally, the degree of vacuum of the vacuum distillation tank (21) is kept constant. If the degree of vacuum can be maintained, the diameter of the vacuum distillation tank can be reduced without having to increase the diameter.If a large vacuum pump capacity is used to maintain the degree of vacuum, vacuum distillation can be performed. The volume of the tank can be extremely small.

In a conventional vacuum distillation tank, when the degree of vacuum is fixed, heating the surroundings to increase the waste liquid temperature has led to an increase in the distillation efficiency. Therefore, a large heat source and a large amount of heat are required to raise the temperature of the entire waste liquid. In Japanese Patent Application No. 11-376553, a heater for heating the entire waste liquid and a heater for the sludge collecting device (5) are provided.
By providing a waste liquid heater (14) at the entrance of the droplet nozzle (15), it is not necessary to heat the entire vacuum distillation tank, and a sufficient vacuum is provided by the heater of the sludge recovery device (8) and the effect of droplet distillation. Distillation efficiency is now available, requiring only the necessary partial heat source. As a result, the heat energy required for heating has been reduced to about 20-30%. In particular, when the sludge recovery device (8) is heated by using a gas such as a gas, the rising airflow of the heating is transferred to the vacuum distillation tank (2).
It was possible to reduce to 17% by utilizing the surrounding heating of 1). Except for the need for temperature because of two heating parts, the temperature was relatively low, the temperature of the vacuum-distilled gas was reduced, and the condensation efficiency was improved.

The floating gas waste liquid separation / recovery device (4) shown in FIG. 5 receives the circulating waste liquid discharged from the waste liquid circulation pump (33) through the waste liquid flow rate regulating valve (34) and rises to the floating gas separator (41).
The distillation gas generated in the waste liquid is separated and floated by colliding with the gas floating baffle plate (42) in the inside. The separated distillation gas is passed through the flow control valve 1 (43) from the upper part, and is introduced into the vacuum distillation tank (21) from below the waste liquid through the distillation gas circulation nozzle (44). The distillation gas is supplied to a vacuum distillation tank (2
1) Bubbling of the accumulated waste liquid in 1) can promote floating. If the diameter of the distillation gas circulation nozzle (44) is too small, bubbling bubbles become small and it becomes difficult to float, while if too large, bubbling becomes large and the bubbling effect cannot be expected. Since it is difficult to specify the appropriate bubble size suitable for bubbling based on the speed and volume of the waste liquid, select the nozzle diameter and the number of nozzles to be installed depending on the distillation gas discharged from the waste liquid. Must. Further, a waste liquid flow control valve (43)
Is used to adjust the flow rate of the waste gas so as to obtain an appropriate foam state. The circulating waste liquid after the separation of the distillation gas collides with the floating waste liquid baffle plate (48) in the floating waste liquid separator (47) through the flow rate control valve 2 (46) and takes the direction of flowing up and down to flow the waste liquid. Accelerate and collect above the flotation waste liquid separator (43). The route to the circulation of the remaining waste liquid is provided by a waste liquid circulation pipe (49) and a valve 1 (12) and a waste liquid heater (14).
Put in between and circulate. The flow control valve 1 (43) and the flow control valve 2 (46) use the amount of the waste liquid that flows vertically to the distillation gas circulation nozzle (44) and the floating waste liquid separator (47) because the amount of the distilled gas discharged by the waste liquid is not constant. Is to adjust. In this case, even if the waste liquid is mixed into the distillation gas circulation nozzle (44), it does not pose a problem only by circulation.
The waste liquid that floats from the floating waste liquid separator (47) is collected and taken out by the floating waste liquid collector (50). In the prior art, the recovery of the floating waste liquid has been carried out by making the liquid level constant, causing the liquid to overflow, absorbing the liquid with a sponge, or rotating the belt. The floating waste liquid recovery method of the floating waste liquid recovery device (50) is as follows.
(FIG. 6) A gradient hopper (51) with a sloped lid is mounted on the floating waste liquid separator (47), and a hopper neck (52) and a drop tank (53) are mounted thereon. First, when the upper part of the head tank (53) is filled with the waste liquid, a pressure difference due to the head is generated regardless of the presence or absence of the hollow part (54) at the upper part. The larger the cavity (54), the smaller the amount of floating waste liquid accumulated in the drop tank (53). The floating waste liquid spreading over a wide area on the upper surface of the floating waste liquid recovery device (50) is narrowed down by the gradient hopper (51) on the large area on the upper surface, and is accumulated on the hopper neck (52). The floating waste liquid accumulates in the head tank. To remove the accumulated waste liquid, a drop tank (53)
May be replaced with a special container, but it can be taken out with a valve as shown in FIG. 7 for continuous operation.
First, open valve 4 (55) and valve 5 (56)
With the valve 6 (57) and the valve 7 (57) closed,
Start waste liquid circulation. Next, when the floating waste liquid collecting device (50) is full of the waste liquid, the valve 5 (56) is closed and allowed to stand still. Here, it was good to do a natural replacement quietly without using any artificial force. The floating waste liquid collected in the floating waste liquid collecting device (50) closes the valve 4 (55) and the valve 6 (57).
And release the vacuum, then open the valve 7 (58) and drop it into the floating waste liquid collecting container (59). During the operation of taking out the floating waste liquid, the floating waste liquid separator (4)
7) Continuous operation is possible without any problem just by collecting floating waste liquid. When the amount of floating waste liquid is very large, continuous operation can be performed without any problem by providing two sets of floating waste liquid collectors (50) in parallel and switching them alternately.

(FIG. 6) The integrated floating material separation / recovery device (6) removes the waste liquid that has passed through the waste liquid circulation pump (33) and passed through the waste liquid flow control valve (34) into the floating material separator (61). The floating object baffle (62) is caused to collide with the floating object, that is, the floating waste liquid and the distillation gas. The waste liquid that has been separated by flotation is
By connecting the residual liquid circulation pipe (63) between the valve 1 (12) and the waste liquid heater (14), the droplet nozzle (15)
Cycle repeatedly from. The floating material that has accumulated on the floating material separator (61) is accumulated by opening the valve 8 (67) attached to the entrance of the floating waste liquid collecting device (50).
At this time, since the inside of the system is entirely vacuum, the distillation gas rises together with the floating waste liquid, also serving as bubbling. In the case of only the floating waste liquid collecting device (50), the vacuum distillation gas is accumulated and the liquid level becomes low, so that even if separation is performed, the floating waste liquid cannot be taken out. If the valve 9 (68) and the distillation gas recovery device (64) are provided at the outlet above the floating waste liquid recovery device (50), the separation of the floating waste liquid can be promoted by bubbling of the distillation gas. The liquid level of the floating waste liquid fluctuates due to the large amount of the liquid. In order to control this, a large amount of distillation gas is released by the large flow control valve (65) to stabilize the liquid level, and the small flow control valve (66) attached in parallel is floated in the distillation gas recovery unit (64). The liquid level is controlled by the object float (69). The distillation gas is returned from the distillation gas circulation nozzle (44) to a position below the waste liquid in the vacuum distillation tank (21) and bubbling is performed to circulate while promoting the separation of the waste liquid in the vacuum distillation tank (21). At the beginning of the operation of the waste liquid circulation pump (33),
Valve 8 (67), valve 9 (68), and valve 10 (7
0) is opened to circulate waste liquid and vacuum distillation gas. Next, when the large flow control valve (65) is squeezed, the liquid level in the distillation gas recovery unit (64) is stopped when the liquid level is lowered by the distillation gas, and the float (69) is floated by the small flow control valve (66).
Automatically adjusts the liquid level to a constant. Due to the bubbling, the floating waste liquid accumulates in the floating waste liquid collector (50) from below the floating float (69) with time. When removing the floating waste liquid, the valve 10 (7
0) and the valve 8 (67) are stopped, the valve 11 (71) is opened to release the vacuum, and the valve 12 (72) is opened and dropped into the floating waste liquid collecting device (58). When the removal is completed, the valve 11 (71) and the valve 12 (72)
Is closed and the valve 10 (70) is opened to create a vacuum, and then the valve 8 (67) is opened for operation. During this time, the suspended matter only accumulates on the suspended matter separator (61), and the vacuum distillation type waste liquid treatment apparatus does not need to be stopped, and can be continuously operated. When a large amount of floating material is accumulated and cannot be used for taking out the floating waste liquid for a long time, the same device may be provided in parallel in double and alternately switched.

The speed of levitation separation due to the difference in levitation method was tested. 0.5 liter of oil was mixed with 30 liters of water in a vacuum distillation tank (21) by forced stirring with a homogenizer, and the separation performance was investigated. The comparison was based on the time required for the oil to float. Mechanical stirring for separation 65 minutes When the specific gravity was close, the oil circulated along the flow of stirring and took a long time. Spontaneous separation by gravity 58 minutes Distillation gas bubbling separation 38 minutes It gathered earlier, but it was necessary to let the stirring of the bubbling calm down and complete the separation completely. Head pressure separation by (Fig. 9) 28 minutes Head pressure separation by (Fig. 9) + distillation gas bubbling separation 19 minutes There are various methods of mechanically stirring and separating (Fig. 9).
The method of taking the pressure of the drop due to the height of the drop tank (53) is excellent. The greater the head, ie, the height, the better the separation. If bubbling generated by the vacuum distillation method enters this head, the separation efficiency is further improved. Floating gas waste liquid separation and recovery device (5) separates by head pressure,
The integrated floating material separation and recovery device (6) uses separation by head pressure and bubbling separation of distillation gas.

The sediment with a large specific gravity can be continuously removed from the sludge removal chamber by further increasing the temperature of the waste liquid in the sludge recovery device (8) as in Japanese Patent Application No. 11-376553.

The distillation gas is condensed by an air dryer (95) as in Japanese Patent Application No. 11-376553, and the condensate is continuously taken out.

The condensed distillation gas is supplied to a vacuum suction device (9).
As in Japanese Patent Application No. 11-376553, suction is performed by a vacuum pump, then deodorized by a deodorizing column, and released to the atmosphere.

[0017]

The replenisher automatically adjusts and replenishes the amount reduced by the distillation gas, floating waste liquid, and settling sludge that has been treated by the waste liquid insertion device (1). At the time of this replenishment, the waste liquid is heated by a waste liquid heater (14) to form droplets from a droplet nozzle (15) and inserted into a vacuum distillation device (2). The waste liquid collected in the vacuum distillation tank (21) is discharged into a hood (3
1) ・ Waste liquid circulation pump (33) ・ Floating gas separator (4)
1) Flowing in the order of the floating waste liquid separator (47), and the floating waste liquid is continuously collected by the floating waste liquid collector (50). The distillation gas discharged from the floating gas separator (41) is returned to the vacuum distillation tank (21) for circulation while bubbling from the distillation gas circulation nozzle (44). Floating waste liquid separator (4
The waste liquid not separated in step 7) is put between the valve 1 (12) and the waste liquid heater (14) for recirculation. The sludge settling in the vacuum distillation tank (21) is recovered while being concentrated in the sludge recovery device (8). Distilled gas is condensed by an air drier (95), and the condensed water is reused or discharged, and the remaining gas is deodorized in a deodorizing column and released to the atmosphere. The waste liquid can be continuously processed without stopping the series of operations. The waste liquid is formed into droplets and inserted into the vacuum vessel, and the inserted waste liquid is circulated to repeatedly form droplets to increase the distillation efficiency. Heating is concentrated at two locations: the droplet discharge section and the sludge recovery section. Increased thermal efficiency. At the same time, continuous treatment is performed to further reduce the size, eliminate odors, and enable waste liquid treatment at the line side in the factory.

[0018]

[Test Example] A basic test of vacuum distillation was performed below.

[Test Example-1]

[Test Example-2]

[0020]

Embodiments of the present invention will be described below. (Conventional example) Conventional example Waste liquid: metal cutting oil Waste liquid treatment weight: 1,000 kg Vacuum container: diameter 2,000 * length 414 mm: volume: about 1.3 lube Installation area: about 12 square meters Processing time: one batch 3.0 hours per hour Residual moisture in sludge: 12.8% Average dehydration rate: 133 kilograms / hour: 13.3% / hour / kg Power consumption: 30 kilowatts (Example-1) Japanese Patent Application No. Hei 11-376553. Wastewater: Metal cutting oil (same wastewater as the conventional example) Wastewater treatment weight: 1,000 kg Vacuum container: Diameter 390 * Length 600 mm: Volume: Approximately 0.7 Lube Installation area: Approximately 3.0 square meters Processing time: 2.5 hours Residual water in sludge: 9.7% Waste liquid collected under vacuum distillation tank 5.8% Slurry Kai taken out after concentrating the recovery device (8) is a yield waste liquid. Average dehydration rate: 375 kilograms per hour: 48.2% / hour per kilogram Power consumption: 11 kilowatts (Example-2) Example of the present invention Wastewater: Metal cutting oil (same wastewater as the conventional example) Wastewater treatment weight: 1 2,000 kg Vacuum container: 350 mm in diameter * 450 mm in length: volume: about 0.43 Lübé Installation area: about 2.0 square meters Processing time: 1.45 hours Residual moisture in sludge: 9.0% Vacuum distillation tank Waste liquid remaining in the waste liquid The remaining amount of waste liquid that cannot be circulated. : 4.9% This is a treated waste liquid discharged after the distillation was stopped due to the limit viscosity of the sludge recovery device, which was discharged in a heated state. . Average dehydration rate: about 680 kilograms: 87.4% / hour / kg Power consumption: 5.2 kilowatts First, insert waste liquid with droplets and insert it into a vacuum distillation tank at about 0.1.
After 5 Lübé waste liquids are accumulated, they are circulated for continuous operation, and after insertion of 1,000 kg, they are treated only by circulation operation. After the circulation was no longer possible, it was concentrated and recovered by a sludge recovery device. Therefore, the continuous operation is a result of about 0.7 lube, and the remaining pool and the remaining processing that can no longer circulate.

[0021]

Since the present invention is configured as described above, it produces the following effects. Since it is small, it can be continuously processed, has no bad smell, and does not use chemicals, there is no chemical management and equipment management is easy, so it can be installed on the production equipment line side in the factory. The fact that this system can be installed on the line side has a great effect on the environment because no harmful wastewater flows out of the factory.

[Brief description of the drawings]

FIG. 1 is an overall view of each unit of the present invention and its flow chart.

FIG. 2 is a path diagram of a waste liquid insertion device.

FIG. 3 is a sectional view of a droplet nozzle.

FIG. 4 is a path diagram of a waste liquid circulation device.

FIG. 5 is a path diagram of a floating gas waste liquid separation and recovery device.

FIG. 6 is an operation diagram of floating a waste liquid.

FIG. 7 is a path diagram of a floating waste liquid collecting device.

FIG. 8 is a path diagram of the integrated floating object separation and recovery device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste liquid insertion apparatus 11 Waste liquid hopper 12 Valve 1 13 Waste liquid float 14 Waste liquid heater 15 Droplet nozzle 16 Shut-off plate 17 Nozzle diameter 18 Parallel obstacle 19 Vertical obstacle 2 Vacuum distillation apparatus 21 Vacuum distillation tank 3 Waste liquid circulation apparatus 31 Food 32 Hood inclination 33 Waste liquid circulation pump 34 Waste liquid flow control valve 4 Floating gas waste liquid separation and recovery device 41 Floating gas separator 42 Gas floating baffle 43 Flow control valve 1 44 Distillation gas circulation nozzle 45 Waste liquid residue 46 Flow control valve 2 47 Floating waste liquid separation Container 48 Floating waste liquid baffle plate 49 Waste liquid circulation pipe 50 Floating waste liquid collector 51 Gradient hopper 52 Hopper neck 53 Drop tank 54 Cavity 55 Valve 4 56 Valve 5 57 Valve 6 58 Valve 7 59 Floating waste liquid recovery container 6 Integrated floating material separation Recovery device 61 Floating material separator 62 Floating material baffle plate 63 Waste liquid circulation pipe 64 Distilled gas recovery device 65 Large flow control valve 66 Small flow control valve 67 Valve 8 68 Valve 9 69 Floating material float 70 Valve 10 71 Valve 11 72 Valve 12 8 Sludge recovery device 9 Vacuum suction Equipment 95 Air dryer

Claims (9)

[Claims] 1. A vacuum-distillation-type waste liquid treatment apparatus provided with a droplet nozzle (15) at a waste liquid inlet of a vacuum distillation tank (21). 2. A droplet nozzle (15) and a valve (12).
A vacuum-distillation-type waste liquid treatment apparatus provided with a waste liquid heater (14) in a pipe section between the two. 3. A vacuum distillation type waste liquid treatment apparatus provided with a waste liquid circulation pump (33) for recirculating waste liquid collected under a vacuum distillation tank (21) to a droplet nozzle (15). 4. A vacuum distillation type waste liquid treatment apparatus provided with a floating gas separator (41) and a floating waste liquid separator (47) in a circulation path of a waste liquid circulation pump (33). 5. A vacuum-distillation-type waste liquid treatment apparatus provided with a float separator (61) in a circulation path of a waste liquid circulation pump (33). 6. A vacuum distillation type waste liquid treatment apparatus provided with a floating waste liquid recovery device (50) incorporating a differential pressure tank (55). 7. A distillation gas circulation nozzle (4) connected to the upper part of a floating gas separator (41) or a floating material separator (61).
4) A vacuum distillation type waste liquid treatment apparatus provided with 4) in a vacuum distillation tank (21). 8. An inclined hood (31) is provided in the vacuum distillation tank (21), and a waste liquid float (13) for adjusting the inclination of the hood (31) is attached thereto.
Vacuum distillation type waste liquid treatment device connected to 3). 9. A vacuum-distillation-type waste liquid treatment apparatus provided with two heating sources, a waste liquid heater (14) and a sludge recovery device (8).