Waste fluid treatment unit and operational method

Abstract

To increase the purity of separated distillate.SOLUTION: A waste fluid treatment unit comprises a heating vessel 2 that can heat waste fluid and a mist removal device 3 that accepts steam from the heating vessel 2 and removes mist contained in the steam. The mist removal device 3 has a wire mesh 33 provided in the path of the steam and a sprayer 34 that sprays water onto the wire mesh 33.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waste liquid treatment apparatus and a method for operating the same. [Background technology]

[0002] A waste liquid concentrator is used, for example, to concentrate waste liquid by distilling and separating water from waste liquid containing water, thereby reducing the amount of waste and reusing the solvent in the waste liquid.

[0003] This type of waste liquid concentrating apparatus uses a heating means to heat the liquid to be distilled (waste liquid) stored in a still, and a suction means to apply suction to the still to evaporate the components to be separated by distillation (e.g., water) contained in the liquid to be distilled. The vapor of the components to be separated by distillation is liquefied in a concentrator, and the components to be separated by distillation are separated as a distilled liquid (e.g., distilled water), thereby concentrating the liquid to be distilled in the still (see, for example, JP 2004-330111 A (Patent Document 1)). The apparatus described in Patent Document 1 is also provided with a treated liquid storage tank that temporarily stores the liquid to be distilled discarded by the user, and in this apparatus, the liquid to be distilled is supplied from the treated liquid storage tank to the still. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-330111 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology of Patent Document 1, some of the components of the liquid to be distilled may be mixed into the separated distillate. Such mixing of components may hinder the use of the distillate in other processes or the discharge of the distillate.

[0006] Therefore, there is a need for a waste liquid treatment device and an operating method thereof that can increase the purity of the separated distillate. [Means for solving the problem]

[0007] The waste liquid treatment device of the present invention comprises a heating container capable of heating the liquid to be treated, and a mist removal device that receives steam from the heating container and removes mist contained in the steam, and is characterized in that the mist removal device has a wire mesh provided in the steam path and a sprayer that sprays water onto the wire mesh.

[0008] With this configuration, the wire mesh installed in the steam path serves to prevent mist contained in the steam from flowing into subsequent processes, making it easier to increase the purity of the separated distillate. In addition, water droplets adhering to the wire mesh are heated by the heat of the steam, so the water droplets are distilled and separated into water and impurities.

[0009] In one aspect of the waste liquid treatment device according to the present invention, the mist removal device preferably has an outlet for discharging steam at a position higher than the sprayer.

[0010] This configuration makes it easier to prevent the sprayed water from flowing directly into the outlet.

[0011] In one aspect, the waste liquid treatment device according to the present invention preferably includes a storage tank for storing water formed by condensation of steam discharged from the mist removal device, and a supply device for supplying water from the storage tank to the sprayer.

[0012] According to this configuration, the water collected in the storage tank is sprayed from a sprayer and re-evaporated using the heat of the steam flowing into the mist removal device, thereby removing impurities contained in the water collected in the storage tank.

[0013] In one aspect, the waste liquid treatment device according to the present invention preferably further includes a control device.

[0014] This configuration makes it possible to perform control based on the detected value of a measuring device provided in the device, for example.

[0015] In one aspect, the waste liquid treatment device of the present invention further has a water supply line that supplies purified water to the storage tank, and it is preferable that the control device controls the supply of purified water from the water supply line to the storage tank and the supply of purified water from the storage tank to the sprayer before controlling the heating container to start heating the liquid to be treated.

[0016] This configuration makes it easier to reduce the impurity concentration of the water that flows into the storage tank at the beginning of operation.

[0017] In one aspect, the waste liquid treatment device of the present invention further includes an inspection device capable of identifying the water quality of at least one of the water stored in the storage tank and the water discharged from the storage tank, and it is preferable that the control device controls the supply device based on the water quality identified by the inspection device.

[0018] This configuration allows the operating conditions to be controlled according to the degree of need for removing impurities.

[0019] In one aspect of the waste liquid treatment apparatus according to the present invention, the testing device preferably identifies the quality of the water to be tested based on the mass of the water.

[0020] This configuration allows the use of a relatively simple inspection device.

[0021] In one aspect of the waste liquid treatment device according to the present invention, the mist removal device preferably further includes a baffle plate provided in the steam path.

[0022] According to this configuration, the baffle plate, in addition to the wire mesh, serves to prevent the mist from flowing into subsequent processes, making it easier to further increase the purity of the separated distillate.

[0023] The operating method of the present invention is a method for operating a waste liquid treatment device comprising: a heating container capable of heating the liquid to be treated; a mist removal device that receives steam from the heating container and removes mist contained in the steam; and a storage tank that stores water condensed from the steam discharged from the mist removal device, wherein the mist removal device has a wire mesh provided in the steam path and a sprayer that sprays water onto the wire mesh, and is characterized by comprising an inspection step of identifying the water quality of at least one of the water stored in the storage tank and the water discharged from the storage tank; and a control step of controlling the amount of water sprayed by the sprayer onto the wire mesh based on the water quality identified in the inspection step.

[0024] According to this configuration, the operating conditions can be controlled according to the degree of need for removing impurities.

[0025] In one aspect of the operating method according to the present invention, it is preferable that in the inspection step, the water quality of the water to be inspected is identified based on the mass of the water.

[0026] This configuration allows for a relatively simple inspection method to be used.

[0027] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which is given with reference to the drawings. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a diagram showing an overview of a waste liquid treatment apparatus according to an embodiment; [Figure 2] FIG. 2 is a configuration diagram of components involved in control of the waste liquid treatment apparatus according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] An embodiment of a wastewater treatment device and an operating method thereof according to the present invention will be described with reference to the drawings. Hereinafter, an example will be described in which the wastewater treatment device according to the present invention is applied to a wastewater treatment device 1 that treats water containing impurities such as triglyme, and an operating method thereof. Triglyme has a boiling point of 216°C, which is higher than that of water.

[0030] [Configuration of waste liquid treatment device] A waste liquid treatment apparatus 1 according to this embodiment includes a heating vessel 2, a mist removal device 3, a distilled water recovery unit 4, and a control device 5 (FIGS. 1 and 2). The waste liquid treatment apparatus 1 is generally an apparatus for reducing the moisture content of the water to be treated by heating the water to be treated in the heating vessel 2 to generate steam, removing the mist contained in the steam using the mist removal device 3, and then condensing the steam to recover distilled water in the distilled water recovery unit 4. Note that components not described (such as valves) may not be shown in the figures.

[0031] (heating container) The heating vessel 2 has a main body 21 that receives the water to be treated, a heating coil 22 that heats the water to be treated inside the main body 21, and a jacket 23 that heats the main body 21 from the outside.

[0032] The main body 21 is connected to the mist eliminator 3 at its upper steam outlet 21a, and is further in fluid communication with the distilled water recovery unit 4 via the mist eliminator 3. The main body 21 is put under negative pressure by a vacuum pump 44 (described later) of the distilled water recovery unit 4, and the water to be treated is sucked in through the inlet 21b by the action of this negative pressure. Furthermore, as the water to be treated is heated and the water evaporates, concentrated impurities (concentrated liquid) accumulate in the lower part of the main body 21. An outlet 21c for discharging the concentrated liquid is provided in the lower part of the main body 21.

[0033] The heating coil 22 and the jacket 23 are both heating devices through which hot water flows and heats the object to be heated by heat exchange between the hot water and the object to be heated. Note that the hot water sources for the heating coil 22 and the jacket 23 are not shown.

[0034] The above-described configuration of the heating vessel 2 is known for this type of heating vessel. Therefore, in addition to the components described above, the heating vessel 2 may optionally include additional components that this type of heating vessel can include. The heating vessel 2 is operated in a batch process, which consists of a set of processes: receiving the water to be treated, heating the water to be treated to produce a concentrated liquid, and discharging the concentrated liquid.

[0035] (Mist removal device) Mist removal device 3 is a device that receives steam from heating container 2 and removes mist contained in the steam (in this embodiment, this is mist of impurities such as triglyme that have been atomized and are entrained in the steam), and is connected to the top of heating container 2. Mist removal device 3 has a main body 31 that defines the steam path, a baffle plate 32 and a wire mesh 33 that are provided in the steam path inside main body 31, and a sprayer 34.

[0036] The main body 31 has an inlet 31a connected to the steam outlet 21a of the main body 21 of the heating vessel 2, and an outlet 31b for discharging steam, and the outlet 31b is fluidly connected to the distilled water recovery unit 4. The main body 31 is put under negative pressure by a vacuum pump 44 (described later) of the distilled water recovery unit 4, and steam is sucked in from the inlet 31a by the action of this negative pressure. The water that enters the main body 31 from the inlet 31a passes through an area where a baffle plate 32 is provided, an area where a wire mesh 33 is provided, and an area where water is sprayed from a sprayer 34, in that order, before being discharged from the outlet 31b.

[0037] The baffle plates 32 and the wire mesh 33 serve to capture mist in the steam path inside the main body 31. The steam and mist that flow into the main body 31 from the inlet 31a travel upward while hitting the baffle plates 32 and the wire mesh 33 on the way to the outlet 31b, and at this time the mist adheres to the baffle plates 32 or the wire mesh 33. Therefore, steam that contains fewer impurities than the steam that flowed in from the inlet 31a is discharged from the outlet 31b. The materials of the baffle plates 32 and the wire mesh 33 are not particularly limited, but may be, for example, stainless steel.

[0038] The sprayer 34 sprays water onto the wire mesh 33, and the water sprayed from the sprayer 34 is supplied from the distilled water recovery unit 4. The water sprayed from the sprayer 34 adheres to the wire mesh 33 as droplets. These droplets are heated by the heat of the steam flowing in from the inlet 31a, and the water in the droplets evaporates. However, these droplets may contain impurities such as triglyme (described below), which remain on the wire mesh 33 without vaporizing. For example, triglyme has a boiling point of 216°C, which is higher than that of water, and therefore does not vaporize even when exposed to the heat of the steam. The impurities eventually flow down the wire mesh 33, enter the main body 21, and finally join the concentrated liquid in the main body 21.

[0039] The outlet 31b of the main body 31 is located at a higher position than the sprayer 34. More specifically, the sprayer 34 is installed with multiple spray nozzles facing downward, and the outlet 31b is located at a higher position than the height of the spray nozzles. This makes it easy to prevent the mist water sprayed from the sprayer 34 from being discharged from the outlet 31b without adhering to the wire mesh 33. As will be described in detail later, the purpose of spraying water from the sprayer 34 is to remove trace amounts of impurities contained in the sprayed water. If the sprayed water were to be discharged from the outlet 31b without adhering to the wire mesh 33, this would defeat the purpose of removing impurities, and therefore this should be avoided.

[0040] (Distilled water recovery unit) The distilled water recovery unit 4 has a heat exchanger 41, a storage tank 42, a water supply line 43, a vacuum pump 44, an inspection device 45, and a water pump 46. The distilled water recovery unit 4 is generally a group of devices that serve to store water condensed from steam discharged from the mist removal device 3 as distilled water in the storage tank 42, and to discharge the distilled water or supply it to the sprayer 34.

[0041] In this embodiment, the negative pressure created by the vacuum pump 44 acts to move the water to be treated and the components separated therefrom in the waste liquid treatment apparatus 1. That is, the suction of the water to be treated in the heating container 2 (main body 21), the suction of the mist-containing steam (from the heating container 2) in the mist removal device 3 (main body 31), and the suction of the steam from which the mist has been removed in the distilled water recovery unit 4 (from the mist removal device 3) are all achieved by the negative pressure created by the vacuum pump 44.

[0042] The heat exchanger 41 cools the steam discharged from the mist removal device 3 and is connected to the discharge port 31b. A known heat exchanger can be used as the heat exchanger 41. A refrigerant such as cooling water is supplied to the heat exchanger 41 from a known refrigerant source (not shown) such as a cooling tower.

[0043] The storage tank 42 is a tank for storing distilled water and is a well-known type of tank. A water level sensor 42a and an inspection device 45 are installed in the storage tank 42. A water supply line 43 and a vacuum pump 44 are also connected to the storage tank 42.

[0044] Water supply line 43 is a pipe connecting a clean water source (not shown) to storage tank 42, and serves to supply clean water to storage tank 42. Here, clean water is water that has a purity above a predetermined standard, such as tap water or industrial water. In other words, clean water is supplied via a system separate from the water to be treated, and is water to which triglyme or the like has not been intentionally added until it reaches storage tank 42. An on-off valve 43a is installed in the water supply line to control the supply of clean water.

[0045] The vacuum pump 44 is a known vacuum pump device, and as described above, serves to reduce the pressure in the storage tank 42 and the components that are in fluid communication with it. Specifically, the vacuum pump 44 reduces the pressure in the heating container 2 (main body 21), the mist removal device 3 (main body 31), the storage tank 42, and the pipes connecting these components.

[0046] Testing device 45 is a device that can test the quality of the water stored in storage tank 42. Specifically, testing device 45 is a device that samples the water stored in storage tank 42 and measures the mass of the sampled water, and the sampled amount is constant on a volume basis. The more impurities there are in the water, the greater the specific gravity of the water, so by keeping the sampled amount constant on a volume basis, it is determined that the greater the mass of the sampled water, the greater the concentration of impurities in the water.

[0047] The water pump 46 is a pump that applies a force to discharge the distilled water stored in the storage tank 42 to the outside of the system or to supply it to the sprayer 34. The pipe on the secondary side of the water pump 46 branches into two. One of the branched pipes, pipe 47, is connected to the sprayer 34 of the mist removal device 3, and the other branched pipe, pipe 48, leads to the outside of the system.

[0048] Pipe 47 leading to sprayer 34 has branch point 47a midway, where it branches into two. One of the branches from branch point 47a is connected via control valve 47b to a pipe upstream of storage tank 42 (the pipe connecting heat exchanger 41 and storage tank 42). The other branch is connected to sprayer 34, and has flow meter 47c and pressure gauge 47d midway.

[0049] A control valve 48a is provided in a pipe 48 for discharging distilled water to the outside of the system. The opening and closing of the control valve 48a is controlled by the control device 5.

[0050] (Control device) The control device 5 is a known control device in terms of hardware. Therefore, a known computer or the like can be used as the control device 5. That is, the control device 5 has general components of a computer, such as a calculation device such as a CPU, a storage device such as a hard disk drive, a display device such as a liquid crystal display, and input devices such as a keyboard and a mouse.

[0051] Of the components described above, the detected values ​​of the water level sensor 42a, the inspection device 45, the flow meter 47c, and the pressure meter 47d are input to the control device 5 (FIG. 2). In addition, the hot water source (not shown) for the heating coil 22 and the jacket 23, the on-off valve 43a, the vacuum pump 44, the water pump 46, the control valve 47b, and the control valve 48a are controlled by the control device 5.

[0052] [Method of operating waste liquid treatment device] Next, we will explain the operation method of the waste liquid treatment device 1 according to this embodiment. First, we will explain the normal operation method for treating the water to be treated (i.e., the method for treating the water to be treated), and second, we will explain the operation method specific to when the waste liquid treatment device 1 starts operation from a stopped state.

[0053] (1) Normal operation method (treatment method for untreated water) Treatment of water to be treated during normal operation of waste liquid treatment device 1 is generally achieved by heating the water to be treated in heating vessel 2 to generate steam, removing mist contained in the steam using mist removal device 3, and then condensing the steam to recover distilled water in distilled water recovery unit 4. Through the above process, the moisture contained in the water to be treated can be recovered as distilled water, which can be used in other processes or discharged with no or only minor treatment.

[0054] Furthermore, impurities such as triglyme contained in the water to be treated are concentrated in the heating vessel 2 to form a concentrate. Since the concentrate is the water from which at least some of the water has been removed, the volume of the concentrate is smaller than that of the water to be treated. Therefore, the above-described process can reduce the volume of waste that needs to be disposed of as industrial waste.

[0055] The function and control of each part of the waste liquid treatment apparatus 1 will be explained below in order. First, the water to be treated is heated in the heating vessel 2. The heat for heating the water to be treated is mainly supplied from the heating coil 22. The heat supplied from the jacket 23 has a strong purpose of preventing the water to be treated from losing heat. The degree of heating of the water to be treated in the heating vessel 2 is adjusted by the temperature and flow rate of the hot water supplied to the heating coil 22 and jacket 23, and this adjustment is performed by the control device 5.

[0056] When the water to be treated is heated in the heating vessel 2, the water in the water evaporates to generate steam. At the same time, impurities such as triglyme are atomized and entrained in the steam as mist. The mist-containing steam is discharged from the heating vessel 2 (steam outlet 21a) and enters the mist removal device 3 (inlet 31a). As mentioned above, the steam is moved by the negative pressure created by the vacuum pump 44.

[0057] The steam that has entered the mist removal device 3 hits the baffle plates 32 and wire mesh 33 provided in the path. At this time, the steam itself is a gas, while the mist is a liquid, so the mist is more likely to adhere to the baffle plates 32 and wire mesh 33 than the steam itself. Therefore, when the steam containing mist passes through the mist removal device 3, at least a part of the mist becomes removed steam by adhering to the baffle plates 32 and wire mesh 33.

[0058] The steam from which the mist has been removed is discharged from the mist eliminator 3 (outlet 31b) and enters the distilled water recovery unit 4. Again, the steam is moved by the negative pressure created by the vacuum pump 44. The steam that enters the distilled water recovery unit 4 is cooled and condensed in the heat exchanger 41 to become distilled water (liquid). The distilled water is guided through a pipeline to the storage tank 42, where it is stored.

[0059] The distilled water that reaches storage tank 42 has had most of the mist (impurities such as triglyme) removed in mist removal device 3, but may still contain traces of impurities derived from the mist that was not removed. As a result, the quality of the water stored in storage tank 42 may not be at a level that allows it to be used as distilled water in other processes, or to be discharged to the system as impurity-free water. Therefore, a portion of the water stored in storage tank 42 is sent to sprayer 34 of mist removal device 3 to further remove impurities in mist removal device 3.

[0060] When water is sprayed onto the wire mesh 33 from the sprayer 34, the sprayed water adheres to the wire mesh 33 as droplets. Steam (steam containing mist) is supplied from the heating container 2 from below the wire mesh 33, and the water droplets are heated by the heat of the steam. When the water droplets are heated, the water in the droplets evaporates into steam, which is then discharged from the outlet 31b and returned to the storage tank 42. Meanwhile, the impurities in the water droplets do not vaporize and remain on the wire mesh 33. They eventually flow down the wire mesh 33, enter the main body 21, and finally join the concentrated liquid in the main body 21. This is because the boiling point of the impurities is higher than that of water (for example, the boiling point of triglyme is 216°C), and the impurities do not vaporize even when exposed to the heat of the steam. In other words, water containing trace amounts of impurities is distilled in the mist removal device 3.

[0061] The force for supplying water from the storage tank 42 to the sprayer 34 is generated by the water pump 46. In this embodiment, the water pump 46 is constantly operating while the waste liquid treatment device 1 is in operation. When the water pump 46 is operated with the control valve 48a of the discharge-side pipe 48 closed, water is supplied from the storage tank 42 to the sprayer 34 through the pipe 47. The flow rate of water supplied to the sprayer 34 can be adjusted by adjusting the aperture of the control valve 47b. The control device 5 closes the control valve 48a and controls the aperture of the control valve 47b based on the indications of the flow meter 47c and the pressure gauge 47d.

[0062] In this case, the target water flow rate for control is determined based on the water quality identified by the testing device 45. When the mass of water sampled by the testing device 45 is relatively large, the concentration of impurities in the water is relatively high, and there is a strong need to remove the impurities. Therefore, in this case, the flow rate of water supplied to the sprayer 34 should be increased. On the other hand, when the mass of water sampled by the testing device 45 is relatively small, the concentration of impurities in the water is relatively low, and the water quality can be used in other processes or discharged outside the system. Therefore, in this case, the flow rate of water supplied to the sprayer 34 can be reduced, or the spraying itself can be stopped.

[0063] The control device 5 controls the control valves 47b and 48a in accordance with the above guidelines. For example, the set value for the flow rate of water supplied to the sprayer 34 is set to a flow rate calculated by a mathematical formula using the detection value of the inspection device 45 as a variable, or a flow rate selected from a predetermined table based on the detection value, and the opening of the control valve 47b is controlled so that the indications of the flow meter 47c and the pressure gauge 47d match the set values. Note that the conditions for determining the set value of the flow rate from the detection value of the inspection device 45 can be determined in advance, for example, experimentally.

[0064] The water pump 46 also generates a biasing force to discharge water from the storage tank 42 to the outside of the system. When the water pump 46 is operated with the control valve 48a of the discharge pipe 48 open, water is discharged to the outside of the system through the pipe 48. The opening and closing of the control valve 48a can be controlled, for example, based on the detection value of the water level sensor 42a. When the water level in the storage tank 42 rises and the water level sensor 42a detects a water level higher than the upper threshold, the control valve 48a is opened, causing water to be discharged to the outside of the system, and the water level in the storage tank 42 drops. When the water level in the storage tank 42 drops and the water level sensor 42a detects a water level lower than the lower threshold, the control valve 48a is closed, stopping the discharge of water to the outside of the system. This control allows the amount of water discharged each time to be constant and the water level in the storage tank 42 to be maintained within a certain range (between the upper and lower thresholds of the water level sensor 42a). The control device 5 controls the control valve 48a according to the above guidelines.

[0065] (2) Operation method at startup Next, we will explain the operating method when starting operation from a stopped state of the waste liquid treatment device 1. When the waste liquid treatment device 1 is stopped, it is in a state of normal temperature and pressure, and the storage tank 42 is empty.

[0066] In this state, if the water to be treated is received in the heating vessel 2 and treated according to the above procedure, water with a relatively high concentration of impurities will be stored in the storage tank 42. Therefore, it may take a long time to reduce the impurity concentration to a level that allows it to be used in other processes or discharged outside the system.

[0067] Therefore, before heating of the water to be treated by heating container 2 begins, purified water is received in storage tank 42 and sprayed by sprayer 34. Specifically, before receiving the water to be treated by heating container 2 or before supplying hot water to heating coil 22 and jacket 23, on-off valve 43a is opened to supply purified water from water supply path 43 to storage tank 42. Then, the purified water stored in storage tank 42 is sprayed by sprayer 34 according to the above control procedure. After taking the above measures, heating of the water to be treated by heating container 2 begins. The subsequent operating method is the same as the normal operating method described above.

[0068] By following this procedure, the impurity concentration of the water flowing into the storage tank 42 at the beginning of operation can be reduced to an acceptable level. In other words, the impurity concentration is suppressed by diluting the treated water with clean water prepared in advance.

[0069] Other Embodiments Other embodiments of the wastewater treatment device and the operating method according to the present invention will be described below. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments, as long as no contradiction occurs.

[0070] In the above embodiment, the mist removal device 3 has been described as having a baffle plate 32. However, in the present invention, the mist removal device may or may not have a baffle plate.

[0071] In the above embodiment, the configuration has been described as an example in which the outlet 31b of the main body 31 is provided at a position higher than the sprayer 34. However, in the present invention, the position of the outlet of the mist removal device is arbitrary.

[0072] In the above embodiment, the water sprayed from the sprayer 34 is supplied from the reservoir 42. However, in the case where the mist removal device of the present invention has a sprayer, the water source is arbitrary. For example, the water may be water containing impurities discharged from another process unrelated to the heating vessel.

[0073] In the above embodiment, the waste liquid treatment device 1 is described as having a control device 5. However, in the present invention, the presence or absence of a control device is optional. Furthermore, when the present invention includes a control device, the control performed by the control device is not limited to the control described in the above embodiment.

[0074] In the above embodiment, the treatment of water containing triglyme or other impurities is described as an example. However, the present invention does not limit the impurities contained in the water. However, because the method for separating water and impurities contained in the water to be treated in the wastewater treatment device of the present invention uses distillation, the impurities preferably have a boiling point different from that of water, and preferably have a boiling point higher than that of water.

[0075] Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will easily understand that appropriate modifications are possible without departing from the spirit of the present invention. Therefore, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention. [Industrial Applicability]

[0076] The present invention can be used, for example, to treat waste liquids containing organic solvents. [Explanation of symbols]

[0077] 1: Waste liquid treatment equipment 2: Heating container 21: Main body 21a: Steam outlet 21b:Inlet 21c: Outlet 22: Heating coil 23: Jacket 3: Mist removal device 31: Main body 31a: Inlet 31b: Outlet 32: Baffle plate 33: Wire mesh 34: Sprayer 4: Distilled water recovery unit 41:Heat exchanger 42: Reservoir 42a: Water level sensor 43: Water supply channel 43a: On-off valve 44: Vacuum pump 45: Inspection equipment 46: Water pump 47: Conduit 47a: Branch point 47b: Control valve 47c:Flow meter 47d: Pressure gauge 48: Conduit 48a: Control valve 5: Control device

Claims

1. a heating container capable of heating the liquid to be treated; a mist removal device that receives steam from the heating container and removes mist contained in the steam, The mist removal device has a wire mesh provided in a steam path and a sprayer that sprays water onto the wire mesh.

2. 2. The waste liquid treatment apparatus according to claim 1, wherein the mist removal device has an outlet for discharging steam at a position higher than the sprayer.

3. a storage tank for storing water condensed from steam discharged from the mist removal device; The waste liquid treatment apparatus according to claim 2 , further comprising: a supply device for supplying water from the storage tank to the sprayer.

4. The waste liquid treatment apparatus according to claim 3 , further comprising a control device.

5. The apparatus further includes a water supply channel for supplying clean water to the storage tank; Before the control device controls the heating container to start heating the liquid to be treated, Controlling the supply of the purified water from the water supply channel to the storage tank; The waste liquid treatment apparatus according to claim 4, further comprising: a control unit for controlling the supply of the purified water from the storage tank to the sprayer.

6. The system further includes an inspection device capable of identifying the quality of at least one of the water stored in the storage tank and the water discharged from the storage tank, The waste liquid treatment apparatus according to claim 4 , wherein the control device controls the supply device based on the water quality identified by the inspection device.

7. The waste liquid treatment apparatus according to claim 6, wherein the testing device identifies the quality of the water to be tested based on the mass of the water.

8. 8. The waste liquid treatment device according to claim 1, wherein the mist removal device further comprises a baffle plate provided in a path of the steam.

9. a heating container capable of heating the liquid to be treated; a mist removal device that receives steam from the heating container and removes mist contained in the steam; a storage tank for storing water condensed from steam discharged from the mist removal device, A method for operating a waste liquid treatment apparatus, wherein the mist removal device has a wire mesh provided in a steam path and a sprayer that sprays water onto the wire mesh, an inspection step of identifying the quality of at least one of the water stored in the storage tank and the water discharged from the storage tank; and a control step of controlling the amount of water sprayed by the sprayer onto the wire mesh based on the water quality identified in the inspection step.

10. The operating method according to claim 9 , wherein the inspection step identifies the quality of the water to be inspected based on the mass of the water.

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