JP5564454B2 - Waste liquid treatment apparatus and method of manufacturing waste liquid treatment apparatus - Google Patents

Description

The present invention relates to a waste liquid treatment apparatus, and more particularly, to a waste liquid treatment apparatus that concentrates or solidifies a waste liquid by heating the waste liquid and a manufacturing method thereof.
In this specification, “waste liquid” refers to various waste liquids such as aqueous cutting oil waste liquid, alkali cleaning waste liquid, carbon polishing powder waste liquid, coating waste liquid, plating waste liquid, glasses polishing waste liquid, and pharmaceutical company process waste liquid. Is not limited to these waste liquids. Further, in this specification, “dehydration” generally means removing liquid components contained in the waste liquid, and the liquid removed from the waste liquid is not limited to water.

It is known that the waste liquid is expensive in proportion to the volume or weight of the waste liquid when the waste liquid is processed as industrial waste. Therefore, in a factory or the like that discharges a large amount of waste liquid, the waste liquid processing cost can be reduced by reducing the volume of the waste liquid. As a method of reducing the volume of such waste liquid, for example, there is a method of heating the waste liquid to evaporate water in the waste liquid to reduce the volume and weight of the waste liquid.
The waste liquid concentrating device for heating the waste liquid conventionally used in such a method is an apparatus in which a heater is directly put into the waste liquid in a waste liquid tank having an upper opening. The heater is configured to directly heat the waste liquid around the heater to evaporate water in the waste liquid.

As described above, when the heater directly heats the waste liquid around the heater, there is a problem that only the waste liquid around the heater is easily solidified, and deposits adhere to the heater and become overheated, causing the heater to burn out.
Moreover, since only the waste liquid around the heater is easily solidified, the entire waste liquid could not be concentrated and solidified. Furthermore, since the deposits firmly adhere to the heater, there is a problem that a great work for removing the deposits is necessary.
Therefore, a waste liquid treatment apparatus having a configuration that solves these problems is desirable, but when a new waste liquid treatment apparatus that can solve all of the problems is manufactured, there is a problem that a very large manufacturing cost is required. .

  Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and by heating the waste liquid, the liquid component of the waste liquid is evaporated and concentrated or solidified to reduce the volume of the waste liquid. It can be made. Furthermore, according to the manufacturing method of the waste liquid processing apparatus of the present invention, the manufacturing cost of the waste liquid processing apparatus can be suppressed.

In order to achieve the above object, the present invention provides a waste liquid treatment apparatus for concentrating or solidifying by evaporating the liquid components of the waste liquid by heating the waste liquid, and sealing the heating pan and the heating pot containing the waste liquid. A lid for heating, an electric heating means for heating the heating pan from the outside, a temperature sensor for detecting the temperature of the heating pan, and a concentration step for concentrating the waste liquid by heating the waste liquid until the temperature sensor detects a predetermined temperature; And a control unit that controls the heating means so that a drying step of repeatedly reducing the temperature of the waste liquid and reheating to a predetermined temperature is performed after the concentration step.
In this invention comprised in this way, waste liquid is accommodated inside the heating pan with which the waste-liquid processing apparatus main body was equipped, and is heated using the electrical heating means provided in the outer side of the heating pan.
The controller of the waste liquid treatment apparatus repeatedly heats the waste liquid until the temperature sensor detects the predetermined temperature to concentrate the waste liquid, and after this concentration process, repeats the temperature reduction of the waste liquid and the reheating to the predetermined temperature. The heating means is controlled so that the drying process is performed. Therefore, the waste liquid stored in the heating pan is concentrated or solidified by evaporating the liquid components, and the volume of the waste liquid is reduced, so that the waste liquid disposal cost can be suppressed.

In the present invention, preferably, it further comprises a waste liquid tank for storing the waste liquid, and a waste liquid supply pump installed in a waste liquid communication means for communicating the waste liquid tank and the heating pan, and the control unit controls the waste liquid supply pump. The waste liquid is introduced into the heating pan before the start of the concentration step, and the waste liquid is additionally supplied to the heating pan during the concentration step.
In the present invention configured as described above, the control unit controls the waste liquid supply pump to introduce the waste liquid into the heating pan before the start of the concentration process, and additionally supply the waste liquid to the heating pot during the concentration process. Therefore, it becomes possible to additionally process more waste liquid than can be supplied to the heating pan at a time.

In the present invention, preferably, the antifoaming agent tank for storing the antifoam goods, the additive tank for storing the additive, and the antifoaming agent communication means for connecting the antifoaming agent tank and the heating pan are further provided. An antifoam supply pump, and an additive supply pump installed in an additive communication means for communicating the additive tank and the heating pan, and the control unit includes an antifoam supply pump, an additive supply pump, The antifoaming agent and the additive are put into the heating pan by controlling
In the present invention configured as described above, the control unit can drive the antifoam supply pump to supply the defoamer to the heating pan, and drive the additive supply pump to supply the additive to the heating pan. it can. Therefore, when the large volume waste liquid is concentrated or solidified while supplying the waste liquid from the large volume waste liquid tank to the heating pan, the control unit can control the supply of the antifoaming agent and / or additive. Therefore, it is possible to concentrate or solidify a large volume of waste liquid while supplying the antifoaming agent and / or additive.

In the present invention, it is preferable that the apparatus further comprises a vapor condensing device connected to the heating pan for condensing the vapor evaporated from the heated waste liquid.
In the present invention configured as described above, the waste liquid steam is condensed by a steam condenser connected to the heating pan. Therefore, harmful substances contained in the waste liquid vapor can be prevented from being directly released to the outside air.

The manufacturing method of the waste liquid treatment apparatus of the present invention detects the temperature of the rice cooking pot, the lid for sealing the rice cooking pot, the electric heating means provided outside the rice cooking pot, and the rice cooking pot. Preparing an electric rice cooker comprising a temperature sensor and a controller for controlling the heating means based on detection of the temperature of the temperature sensor;
The controller heats the waste liquid until the temperature sensor detects the predetermined temperature, concentrates the waste liquid, and after this concentration process, executes a drying process that repeatedly lowers the temperature of the waste liquid and reheats it to the predetermined temperature. And a step of modifying the program of the control unit.
In the present invention configured as described above, in the method for producing a waste liquid treatment apparatus, the waste liquid treatment apparatus can be produced using an electric rice cooker for rice cooking. And the manufacturing cost of a waste-liquid processing apparatus can be suppressed significantly.

  According to the waste liquid treatment apparatus of the present invention, the capacity of the waste liquid can be reduced. Furthermore, according to the manufacturing method of the waste liquid processing apparatus of the present invention, the manufacturing cost of the waste liquid processing apparatus can be suppressed.

It is a figure explaining the structure of the waste-liquid processing apparatus of this invention. It is a figure explaining the effect | action of the waste-liquid processing apparatus of this invention.

Hereinafter, a waste liquid treatment apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating the configuration of the waste liquid treatment apparatus of the present invention, and FIG. 2 is a diagram illustrating the operation of the waste liquid treatment apparatus of the present invention.
As shown in FIG. 1, the waste liquid treatment apparatus 1 includes a waste liquid tank 2, an antifoaming agent tank 4, an additive tank 6, a vapor condensing tank 8, and a waste liquid treatment apparatus main body 10.

The waste liquid tank 2 is a large capacity tank that can store the waste liquid to be dehydrated.
The antifoaming agent tank 4 is a tank that stores the antifoaming agent. The antifoaming agent is a waste liquid antifoaming agent, and for example, a silicon-based antifoaming agent or the like can be used as the antifoaming agent.
The additive tank 6 is a tank that stores the additive. The additive is a waste liquid odor prevention agent or the like, and as the additive, for example, an aqueous citric acid solution for adjusting pH can be used.
The steam condensing tank 8 is a steam condensing tank that condenses and collects the steam generated in the waste liquid treatment apparatus main body 10. The vapor condensing tank 8 contains, for example, water up to a predetermined water level. The vapor is led into the liquid in the vapor condensing tank 8 and condensed. The vapor condensing tank 8 is configured such that the liquid distillate in the vapor condensing tank 8 is allowed to flow into the sewage or reused. The waste liquid treatment apparatus main body 10 and the steam condensing tank 8 are communicated with each other through a steam pipe 12. One end of the steam pipe 12 is opened in the liquid of the steam condensing tank 8. The vapor condensing tank 8 can also prevent harmful substances contained in the waste liquid vapor from being directly released to the outside air. In order to prevent a back flow from the steam condensing tank 8 to the waste liquid processing apparatus main body 10 when the pressure on the waste liquid processing apparatus main body 10 side decreases, a backflow prevention valve, a vacuum breaker, or the like may be provided on the steam pipe 12. good.

The waste liquid tank 2 and the waste liquid processing apparatus main body 10 are communicated with each other through a waste liquid pipe 16 (waste liquid communication means) via a waste liquid supply pump 14. The waste liquid supply pump 14 can be driven by a control unit to be described later, and the waste liquid supply pump 14 can drive the waste liquid from the waste liquid supply tank 2 to the waste liquid processing apparatus main body 10. The communication means may be any means capable of fluid communication such as a pipe and a hose.
The antifoaming agent tank 4 and the waste liquid treatment apparatus main body 10 are communicated with each other by an antifoaming agent pipe 20 (antifoaming agent communicating means) via an antifoaming agent supply pump 18. The antifoaming agent supply pump 18 can be driven by a control unit described later, and the antifoaming agent can be supplied from the antifoaming agent tank 4 to the waste liquid treatment apparatus main body 10 by driving the antifoaming agent supply pump 18. The communication means may be any means capable of fluid communication such as a pipe and a hose.
The additive tank 6 and the waste liquid treatment apparatus main body 10 are communicated by an additive pipe 24 (additive communication means) via an additive supply pump 22. The additive supply pump 22 can be driven by a control unit described later, and the additive supply pump 22 can drive the additive from the additive tank 6 to the waste liquid processing apparatus main body 10. The communication means may be any means capable of fluid communication such as a pipe and a hose.

Next, details of the waste liquid processing apparatus main body 10 will be described. The waste liquid processing apparatus main body 10 is configured to heat the waste liquid to be dehydrated to evaporate the liquid component in the waste liquid, and to concentrate and solidify the liquid component.
The waste liquid processing apparatus main body 10 includes a lid 26, a waste liquid processing apparatus main body case 28, a heating pan 30, an electric heating means 32, a temperature sensor 34, a liquid level sensor 36, and a control unit 38.

  The lid 26 is formed in a disc shape and can form a sealed space inside the heating pan 30 in alignment with the cylindrical upper edge of the heating pan 30. The lid | cover 26 is formed with the heat resistant and pressure | voltage resistant material which can be equal even if the inside of the heating pan 30 becomes high temperature high pressure at the time of waste liquid heating. The lid 26 can be removed from the waste liquid processing apparatus main body 10 to perform work such as cleaning or replacement. The steam pipe 12, the waste liquid pipe 16, the antifoaming pipe 20, and the additive pipe 24 are arranged so as to penetrate from the outside of the lid 26 through the lid 26 to the space inside the heating pan 30.

  The waste liquid processing apparatus main body case 28 is a case in which the heating pan 30, the heating means 32, the temperature sensor 34, the control unit 38, and the like are installed inside. A control panel, which will be described later, is installed outside the waste liquid processing apparatus main body case 28.

The heating pan 30 has a cylindrical pan shape with an open top, and is formed of a heat-resistant and pressure-resistant material. Therefore, the heating pan 30 can withstand the high temperature when the waste liquid is heated. In the present embodiment, the heating pan 30 has a capacity capable of treating about 6 liters of waste liquid.
The heating pan 30 is configured to be removable from the waste liquid processing apparatus main body case 28. Therefore, it is easy for the user to remove the heating pan 30 from the waste liquid processing apparatus main body 10 after concentrating and solidifying the waste liquid, and to perform work such as cleaning and replacement. Furthermore, since the deposit prevention processing is made on the surface of the heating pan 30, the solidified and dried solid matter (residue) of the waste liquid after concentration and solidification can be easily peeled off and removed. In the case where the dried product after concentration and solidification has adhesiveness, a turtle shell metal net or a heat-resistant net is installed in the heating pan 30 in advance. After the waste liquid is concentrated or solidified, the dried solid matter can be easily taken out at the same time by taking out the turtle shell metal net or the heat-resistant net.

  The electric heating means 32 is provided in the lower part outside the heating pan 30 and inside the waste liquid processing apparatus main body case 28. The electric heating means 32 is a heater that is in contact with the heating pan 30 on the surface and that heats the heating pan 30 by energizing electricity. Therefore, the heating means 32 can adjust the heater on / off and heating intensity in detail according to the energized state of electricity. The heating means 32 has a 100% rated output of 5 kw, and the output can be adjusted every 50 w in the range of 2 kw to 5 kw. Furthermore, it is possible to adjust the energization rate% of the heating means 32. Here, since the heater 32 is provided outside the heating pan 30, there is an advantage that the waste liquid does not contact with the waste liquid. Thus, since the waste liquid does not adhere to the heater, there is no fear that the heater will burn out, and the waste liquid can be dehydrated until the waste liquid is solidified.

  The temperature sensor 34 is a detector that detects temperature. The temperature sensor 34 is sandwiched between the lower portion of the heating pan 30 and the heating means 32 and is disposed so as to detect the temperature of the heating pan 30. The temperature sensor 34 includes a thermal fuse that operates at 146 ° C.

  The liquid level sensor 36 is inserted into the inside of the heating pan 30 from the outside of the lid 26 and is configured to detect the height of the liquid level of the waste liquid in the heating pan 30. The liquid level sensor 26 can be constituted by, for example, a float type sensor or an electrode rod.

The control unit 38 is a microcomputer installed in the waste liquid processing apparatus main body 10 and controls connected components by electrical signals in accordance with instructions of a program written in a memory or ROM of the microcomputer.
The control unit 38 is electrically connected to the lid 26, the heating means 32, the temperature sensor 34, the liquid level sensor 36, the control panel 40, the waste liquid supply pump 14, the antifoaming agent supply pump 18, the additive supply pump 22, and the like. Yes.
The control unit 38 controls the heating unit 32 from information such as temperature sensor 34, liquid level sensor 36, and control panel 40 input. It is also possible to arbitrarily connect the control unit 38 to other components such as a safety device.

  The program 39 of the control unit 38 is a command program that controls the control unit 38 of the waste liquid treatment apparatus 1. Controlling the waste liquid treatment apparatus 1 means controlling each component of the waste liquid treatment apparatus 1 so that the waste liquid can be dehydrated as described below. As will be described later, the program 39 controls the heating means so that the concentration step and the drying step are executed.

In order to enhance safety during operation, the lid 26 includes a pressure adjustment mechanism 42 and a lock mechanism 44.
The pressure adjusting mechanism 42 is configured to prevent the pressure inside the heating pan 30 from rising abnormally.
The locking mechanism 44 is a mechanism that locks the lid 26 so that it does not open while the heating pan 30 is sealed. The lid 26 is operated with the lid 26 opened to prevent hot steam from blowing out and harmful steam from flowing out of the steam condensing tank 8. The lock mechanism 44 is connected to the control unit 38. Therefore, the control unit 38 issues a warning sound when the user tries to start driving in a state where the lock mechanism 44 is not locked, and warns the user not to start driving.

Next, the control panel 40 that can be operated by the user will be described.
The control panel 40 is disposed in front of the outer side surface of the waste liquid processing apparatus main body case 28 so as to be easily seen by the user. The control panel 40 includes a display unit 46 that displays an operation state of the waste liquid treatment apparatus 1 and an operation unit 48 that can be operated by the user.

The display unit 46 of the control panel 40 can display parameter setting numerical values (control setting numerical values) that are settings for controlling the waste liquid treatment apparatus, and can display the operation state of the dehydrating apparatus 1 with numerical values, characters, and the like. Furthermore, a patrol light may be connected as the display unit 46, and the operating state of the dehydrating apparatus 1 may be notified by the patrol light.
The operation unit 48 includes operation buttons of the waste liquid processing apparatus main body 10. The operation buttons are, for example, an operation start button, a numerical value adjustment button, and the like, and the function of each operation button can be changed by a program. When the user presses the driving start button, the start of driving operation is notified to the control unit. In accordance with the input of the operation button, the parameter setting value of the dehydrating apparatus 1 (that is, the control setting of the dehydrating apparatus) can be displayed and / or changed. Furthermore, the user may perform a so-called manual operation operation that causes the start of heating, the start of repeated heating operation, the forced termination of operation, etc. by operating the operation button during the operation operation of the dehydrator 1. It is possible.
Therefore, the user can easily change the numerical value of the parameter of the waste liquid treatment apparatus 1 by operating the operation unit 48 described later while visually recognizing the display unit 46.
“Numerical values of parameters” referred to in the present invention are, for example, set numerical values such as a heater output, a heater energization rate, the number of heating repetitions, a temperature at which heating is stopped, a heating pause time of the heater, and a temperature at which the operation of the dehydrator is terminated. Indicates.
In this way, the user can adjust the waste liquid treatment apparatus 1 so that the waste liquid treatment apparatus 1 can be operated more efficiently in accordance with the operation status of the waste liquid treatment apparatus 1. For example, the user can adjust the waste liquid treatment device according to the type of waste liquid, the surrounding environment where the dehydrating apparatus is installed, the final concentration / solidification state of the waste liquid intended by the user, and the like.

  Next, the operation of the waste liquid treatment apparatus 1 of the present invention will be described in detail with reference to FIG. FIG. 2 is a diagram for explaining the operation of the waste liquid treatment apparatus of the present invention. In FIG. 2, the horizontal axis indicates the time axis T, and the vertical axis indicates the pan bottom temperature ° C. and the heating means corresponding to the time axis T, ON and OFF.

First, the case where the waste liquid, the antifoaming agent, and the additive are manually added will be described.
The user operates the waste liquid supply pump 14 to supply the waste liquid to be dehydrated into the heating pan 30 for the usual 6 liters.
Next, the user operates the antifoam supply pump 18 to supply a predetermined amount of antifoam in the heating pan 30. Similarly, the user drives the additive supply pump 22 to supply a predetermined amount of additive into the heating pan 30.
The user locks the lock mechanism 44 of the lid 26 by matching the lid 26 with the cylindrical upper edge of the heating pan 30. Since the heating pot 30 and the lid | cover 26 are closely_contact | adhered inside the heating pot 30, it will be in the state sealed.
Thereafter, the user operates the control panel 40 to adjust the parameter setting value of the waste liquid treatment apparatus 1.
The user operates the operation start button at time T <b> 1 in FIG. 2 to send an operation start signal to the control unit 38 and activate the waste liquid treatment apparatus 1.

  At time T <b> 1, the dehydrating apparatus 1 starts heating by the heating unit (heater) 32 under the control of the control unit 38. The controller 38 sets the output of the heating means 32 to 5 kw, which is 100% of the rated output, from the start until the temperature sensor 34 detects the predetermined temperature 115 ° C. The predetermined temperature 115 ° C. can be set to another temperature such as 125 ° C., for example. In the present embodiment, the process from the start of heating by the heating means 32 (time T1) to the stop of heating by detecting the predetermined temperature 115 ° C. of the temperature sensor 34 (time T2) is referred to as a concentration process. In this concentration step, the liquid component of the waste liquid charged into the heating pan 30 is evaporated, and the vapor of the liquid component is introduced into the vapor condensing tank 8 through the vapor pipe 12 and condensed.

When the liquid component of the input waste liquid is evaporated and the liquid component in the waste liquid decreases, the temperature of the heating pan 30 gradually increases. When the temperature sensor 34 detects the predetermined temperature 115 ° C. at the time T2, the control unit 38 starts control so that the heating unit 32 repeats heating and heating pause alternately. Such a process in which the heating means 32 repeats heating is referred to as a drying process. When the heating means 32 stops heating at time T2, the temperature at the bottom of the heating pan 30 begins to gradually decrease.
After the temperature sensor 34 detects the predetermined temperature 115 ° C. at the time T2, the heating unit 32 stops energizing the heating unit 32 for a predetermined time (heating stop time) of 60 seconds until the time T3, and the heating is stopped. To do. Thereby, it is prevented that the temperature of the heating pan 30 rises excessively. Note that the heating means 32 may not be completely de-energized but may continue heating at a low output.
In the present embodiment, the heating is stopped for a predetermined time after the temperature reaches 115 ° C. As a modification, after the temperature sensor 34 detects the predetermined temperature 115 ° C., for example, the temperature is 100 ° C. It is also possible to control the heating to be stopped until the temperature decreases.
During the period from time T2 to time T3, the pan bottom temperature of the heating pan 30 gradually decreases, but the evaporation of the liquid component of the waste liquid continues and the waste liquid is concentrated and solidified. Until the time T3, the predetermined time until the time T3 can be determined so that the evaporation of the waste liquid continues actively even if the heating is stopped.

  At time T3, the heating means 32 starts reheating again. At time T3, the temperature of the waste liquid is lower than the temperature of the waste liquid at time T2. The temperature of the waste liquid is reheated and starts to rise again. As the temperature of the waste liquid rises, many liquid components in the waste liquid again evaporate. Since such repeated heating is performed, the temperature of the waste liquid can be maintained at a predetermined temperature around 115 ° C. Thereby, the liquid component which remains in a waste liquid can be reduced significantly.

  The reheating by the heating unit 32 is performed until the control unit 38 sets the output of the heating unit 32 to 3 kw and the temperature sensor 34 detects a predetermined temperature 115 ° C., for example. When the temperature sensor 34 detects a predetermined temperature 115 ° C. at time T4, the heating means 32 stops heating again. Thus, the heating means 32 repeats heating and heating pause alternately. Similarly, the control unit 38 repeats the reheating and resuspension of the heating unit 32 for the set number of times from time T5 to time T42. Thus, by repeatedly reheating the waste liquid, it is possible to evaporate the liquid component of the waste liquid to increase the concentration of the waste liquid and finally solidify depending on the type of the waste liquid.

  The heating pause time of the heating means 32 is set to 60 seconds, but the setting is changed depending on the type and amount of waste liquid to be dehydrated. In this embodiment, the heating pause time can be changed every 10 seconds from 30 seconds to 360 seconds. The repeated heating can be performed a predetermined number of times from 1 to 31. In this embodiment, the repeated heating is repeated 20 times from time T2 to time T42. For example, when the number of times of repeated heating is the 20th time, the heating pause time can be changed in accordance with the number of times of repeated heating, such as making the heating pause time longer than 60 seconds. As the waste liquid is concentrated and solidified, the heating pause time is changed according to the change in the rate of temperature decrease, so that the concentration and solidification can be promoted efficiently. Similarly, the setting of the predetermined temperature may be changed according to the number of repeated heating.

At time T <b> 42, the controller 38 stops the heating by the heating unit 32 when the repeated heating is completed 20 times. Therefore, the temperature of the concentrated or solidified waste liquid begins to gradually decrease. Thereafter, when the temperature sensor 34 detects the predetermined temperature 60 ° C. at time T43, the control unit 38 displays the end of dehydration on the control panel 40 or notifies the user by sound or the like. The process from time T42 to time T43 is referred to as a cooling process. By performing the cooling step, it becomes possible for the user to take out the solidified dry matter (residue) that was at a high temperature at a safe temperature.
After time T43, the user can open the lid 26 and take out the solidified solid after the dehydration of the waste liquid to be dehydrated.

Next, the case where the supply of the waste liquid, the antifoaming agent, and the additive is automatically performed under the control of the control unit 38 will be described. Since the operation of the waste liquid treatment apparatus 1 in the present embodiment is different in the concentration step, description of operations common to the case where the user supplies the waste liquid, the antifoaming agent, and the additive is omitted.
The relationship between the pan bottom temperature and time of the waste liquid treatment apparatus 1 in the present embodiment is substantially the same except that the interval between the times T1 and T2 in FIG.
First, the user operates the control panel 40 to adjust the parameter setting value of the waste liquid treatment apparatus 1.
At time T <b> 1, the user operates the operation start button to send an operation start signal to the control unit 38 and activate the waste liquid treatment apparatus 1. The controller 38 drives the waste liquid supply pump 14 for a predetermined time, and supplies the waste liquid to be dehydrated from the external waste liquid tank 2 to the heating pan 30 until the liquid level sensor 36 detects the liquid level.
Next, the control unit 38 drives the antifoaming agent supply pump 18 for a predetermined time to supply a predetermined amount of the antifoaming agent into the heating pan 30. Similarly, the control unit 38 drives the additive supply pump 22 for a predetermined time to supply a predetermined amount of the additive into the heating pan 30.

The control part 38 will start the heating by the heating means 32, after supply of an antifoamer and an additive is complete | finished (concentration process start). When the waste liquid evaporates by heating and decreases in the concentration process and the liquid level drops to a predetermined height, the control unit 38 drives the waste liquid supply pump 14 so that the liquid level sensor 36 has a predetermined liquid level height. The waste liquid is resupplied from the waste liquid tank 2 to the heating pan 30 until the position is detected again. That is, the amount of waste liquid substantially the same as the amount of the liquid component of the waste liquid evaporated by heating is supplied to the heating pan 30 by resupply. The control unit 38 supplies a predetermined amount of the antifoaming agent from the antifoaming agent tank 4 and supplies a predetermined amount of the additive from the additive tank 6 together with the resupply of the waste liquid to be dehydrated. The controller 38 continues heating by the heating means 32 during or after the resupply of the waste liquid or the like. In the step of concentrating the waste liquid of the present invention while heating, the concentration of the waste liquid concentrated by re-supplying the waste liquid once decreases. When the waste liquid is supplied again, the temperature of the waste liquid also decreases. In this way, heating is continued while the volume of the waste liquid is kept within a certain range to evaporate the liquid component in the waste liquid.
During the concentration process, the control unit 38 re-supplies waste liquid or the like from the waste liquid tank 2 or the like a predetermined number of times. Therefore, it becomes possible to process more industrial waste liquid than the quantity which can be thrown into the heating pan 30 at once.

  When the temperature sensor 34 detects the predetermined temperature 115 ° C. at the time T2 after the control unit 38 performs the re-supply of the waste liquid a predetermined number of times, the control unit 38 causes the heating unit 32 to alternately perform heating and heating pause. Initiate repeated drying process. After the controller 38 starts heating the heating means 32 repeatedly, the waste liquid to be dehydrated, the antifoaming agent and the additive are not newly supplied.

At time T <b> 42, the controller 38 stops the heating by the heating unit 32 when the repeated heating is completed 20 times.
When the temperature sensor 34 detects the predetermined temperature 60 ° C. at time T43, the control unit 38 displays the end of dehydration on the control panel 40 or notifies the user by sound or the like.
After the time T43, the user can open the lid 26 and take out the solidified dried product (residue) after the dehydration of the waste liquid to be dehydrated.

Next, the effect of the waste liquid treatment apparatus of the above-described embodiment of the present invention will be described.
According to the waste liquid treatment apparatus of the present embodiment, the waste liquid is accommodated inside the heating pan 30 provided in the waste liquid treatment apparatus main body 10 and heated using the electric heating means 32 provided outside the heating pot 30. The
The control unit 38 of the waste liquid treatment apparatus 1 heats the waste liquid until the temperature sensor 34 detects the predetermined temperature, and after reducing the temperature, reheats the waste liquid until the temperature sensor 34 detects the predetermined temperature. The heating means 32 is controlled so as to concentrate or solidify by repeating heating. Accordingly, the waste liquid stored in the heating pan 30 is concentrated or solidified by evaporating the liquid components and the volume of the waste liquid is reduced, so that the waste liquid disposal cost can be suppressed.
Further, since the heating pan 30 is sealed by the lid 26, the efficiency of evaporation of the liquid component of the waste liquid by the heat applied by the electric heating means 32 is good.
Further, according to the waste liquid treatment apparatus 1 of the present embodiment, the capacity and weight can be reduced to about 1/20 depending on the type of waste liquid.

  According to the waste liquid treatment apparatus of the present embodiment, the control unit 38 drives the waste liquid supply pump 14 based on the detection of the waste liquid level position of the heating pan 30 of the liquid level sensor 36 to heat the waste liquid from the waste liquid tank 2. Can be supplied to the pan 30. Therefore, it is possible to concentrate or solidify the large volume waste liquid while supplying the waste liquid from the large volume waste liquid tank 2 to the heating pan 30 according to the liquid level position of the waste liquid.

  According to the waste liquid treatment apparatus of the present embodiment, the control unit 38 can drive the antifoam supply pump 18 to supply the antifoam to the heating pan 30 and drive the additive supply pump 22 to heat the additive. Can be supplied to the pan 30. Therefore, when the large volume waste liquid is concentrated or solidified while supplying the waste liquid from the large volume waste liquid tank 2 to the heating pan 30, the control unit 38 can control the supply of the antifoaming agent and / or additive. Therefore, it becomes possible to concentrate or solidify a large volume of waste liquid while supplying an antifoaming agent and / or an additive.

  According to the waste liquid treatment apparatus of the present embodiment, the waste liquid vapor is condensed by the vapor condensing device 8 communicated with the heating pan 30. Therefore, harmful substances contained in the waste liquid vapor can be prevented from being directly released to the outside air.

Next, a method for manufacturing a waste liquid treatment apparatus according to an embodiment of the present invention will be described.
As described above, the waste liquid treatment apparatus according to the embodiment of the present invention includes a heating pan, a lid, an electric heating means, a temperature sensor, a control unit for controlling these, and the like. When a device having these configurations is designed and manufactured exclusively, unless a very large number of devices are manufactured, the cost per device becomes enormous and the marketability is poor.
The inventors of the present invention have made many experiments and trials and errors to reduce the manufacturing cost of the waste liquid treatment apparatus. As a result, the rice in the field of food and drink equipment, which is a field completely different from the waste liquid treatment, is used. The idea was to apply an electric rice cooker for cooking. That is, a waste liquid processing apparatus according to an embodiment of the present invention is manufactured by using each component such as a rice cooker, a lid, a heater, a temperature sensor, and a control unit that controls the rice cooker provided in a commercially available electric rice cooker. I was inspired by that. Since the electric rice cooker is an electric device that is generally manufactured and sold in large quantities, it can be obtained at a relatively low cost, and includes many components that can be applied to the waste liquid treatment apparatus according to the embodiment of the present invention. It was found that However, rice cooking and industrial waste liquid treatment are completely different, especially because the waste liquid may contain oil, so simply storing the waste liquid in an electric rice cooker and heating it would Not only can it be sufficiently concentrated and solidified, but it can be dangerous depending on the waste liquid to be treated. Therefore, the inventors of the present invention have developed a specific method for manufacturing a waste liquid treatment apparatus for waste liquid such as a factory using an electric rice cooker for rice cooking.

In the manufacturing method of the waste liquid treatment apparatus of the present embodiment, first, the rice cooking pot for containing the waste liquid inside, the lid for sealing the rice cooking pot, the heater provided on the outside of the rice cooking pot, and the temperature of the rice cooking pot are set. An electric rice cooker including a temperature detector to be detected and a controller capable of controlling the heater based on detection of the temperature of the temperature detector is prepared. Next, a program built in the controller is used to concentrate the waste liquid by heating the waste liquid until the temperature detector detects the predetermined temperature, and after this concentration process, the temperature of the waste liquid is reduced to the predetermined temperature. The drying process is repeated to repeat the reheating.
That is, the rice cooking pot, lid, heater, temperature detector, and controller provided in the electric rice cooker are the heating pot 30, lid 26, electric heating means 32, temperature sensor 34, and control unit in the waste liquid treatment apparatus 1. 38, respectively.

  Furthermore, depending on the configuration of the waste liquid treatment apparatus, the steam condenser tank 8 is connected to the electric rice cooker (waste liquid treatment apparatus main body 10) via the steam pipe 12, and the waste liquid tank 2 is connected to the electric rice cooker via the waste liquid pipe 16. , The antifoam tank 4 is connected via the antifoam pipe 20, and the additive tank 6 is connected via the additive pipe 24. Further, the liquid level sensor 36 is inserted into the inside of the heating pan 30 from the outside of the lid 26, and the controller is electrically connected to the liquid level sensor 36, the waste liquid supply pump 14, the antifoaming agent supply pump 18, the additive supply pump 22, and the like. Connect.

  In the process of modifying the program built in the controller, for example, a ROM, memory or the like storing a program created for waste liquid processing is mounted on the controller board, or a program created for waste liquid processing is installed. Write to the rewritable ROM, memory, etc. of the controller. By modifying the program of the controller, the controller can execute the concentration process and the drying process based on the instructions of the program.

In this embodiment, the advantageous effect by using an electric rice cooker is shown below.
In the present embodiment, a rice cooker of an electric rice cooker is used as the heating pan 30. The rice cooking pan is formed of a heat-resistant and pressure-resistant material for cooking rice, and can withstand high temperatures when the heating pan 30 heats the waste liquid. It is configured to be removable from the rice cooker body case 28 in order to remove the rice cooking pot during rice cooking and perform water supply and washing. Therefore, it is easy for the user to remove the heating pan 30 from the waste liquid processing apparatus main body 10 after concentrating and solidifying the waste liquid, and to perform work such as cleaning and replacement. Furthermore, the rice cooker has been subjected to Teflon (registered trademark) processing or marble processing for preventing adhesion in order to prevent the rice from firmly adhering to its surface. Residue) can be easily peeled off and removed.

  The lid of the rice cooker is formed of a heat-resistant and pressure-resistant material that can withstand even when the temperature of the rice cooking pan becomes high temperature and high pressure during rice cooking. Therefore, it can withstand the high temperature when the waste liquid is heated in the heating pan 30. Furthermore, the rice cooker lid includes a pressure adjustment mechanism and a lock mechanism in order to increase the safety of operation during rice cooking. Therefore, when the waste liquid is heated and evaporated to increase the pressure inside the heating pan 30, it is possible to prevent an accident in which steam is suddenly released. Further, the operation is performed with the lid 26 open, and the high temperature steam of the waste liquid is blown out and harmful steam is prevented from flowing out of the steam condensing tank 8.

Commercial electric rice cookers also include a heater, a temperature detector, a controller, and the like.
The controller of the electric rice cooker is initially provided with a rice cooking program for rice cooker operation. In the rice cooker with the additional cooking function, the additional cooking function can be applied to the drying process for repeatedly heating the waste liquid, and the program can be modified to repeatedly execute the additional cooking function many times. The modified program may be a program developed from the original rice cooking program or a newly created program.
Furthermore, since the electric rice cooker includes a display unit that displays the rice cooking state and the like, and an operation unit that is operated by the user, the display unit 46 that displays the operation state and the like of the waste liquid treatment apparatus 1 and the like. The operation unit 48 can be applied. Thereby, the waste liquid processing apparatus 1 with good operability can be configured at low cost.

  According to the manufacturing method of the waste liquid processing apparatus of the embodiment of the present invention, since the waste liquid processing apparatus 1 can be manufactured using the electric rice cooker for rice cooking, the waste liquid processing apparatus can be easily manufactured. And the manufacturing cost of a waste-liquid processing apparatus can be suppressed significantly.

  In the above-described embodiment of the present invention, the waste liquid treatment apparatus 1 includes the waste liquid tank 2, the antifoaming agent tank 4, and the additive tank 6. However, the user uses the waste liquid, the antifoaming agent, and the additive. If it is set as the structure which throws an agent directly into the heating pan 30, these can be abbreviate | omitted. Further, in the above-described embodiment of the present invention, the waste liquid treatment apparatus 1 includes the vapor condensing tank 8, but in an apparatus premised on the treatment of the waste liquid that can release evaporated vapor directly to the atmosphere, the vapor condensing tank 8 can be omitted.

DESCRIPTION OF SYMBOLS 1 Waste liquid processing apparatus 2 Waste liquid tank 4 Antifoam tank 6 Additive tank 8 Steam condensation tank 10 Waste liquid processing apparatus main body 12 Steam pipe 14 Waste liquid supply pump 16 Waste liquid pipe 18 Antifoam supply pump 20 Antifoam pipe 22 Additive supply Pump 24 Additive pipe 26 Lid 28 Waste liquid treatment device main body case 30 Heating pan 32 Electric heating means 34 Temperature sensor 36 Liquid level sensor 38 Control unit 39 Program 40 Control panel 42 Pressure adjustment mechanism 44 Lock mechanism 46 Display unit 48 Operation unit

Claims (5)

In a waste liquid treatment apparatus that concentrates or solidifies by evaporating the liquid components of the waste liquid by heating the waste liquid,
A heating pan containing waste liquid;
A lid for sealing the heating pan;
Electric heating means for heating the heating pan from the outside;
A temperature sensor for detecting the temperature of the heating pan;
The waste liquid is heated until the temperature sensor detects a predetermined temperature higher than 115 ° C. to concentrate the waste liquid, and after the concentration process, heating is stopped for a predetermined heating pause time or A controller that controls the heating means so as to execute a step of reducing a heating output to reduce the temperature of the waste liquid and a step of reheating the waste liquid to a predetermined temperature for a predetermined number of times. A waste liquid treatment apparatus comprising:   Furthermore, a waste liquid tank for storing the waste liquid, and a waste liquid supply pump installed in a waste liquid communication means for communicating the waste liquid tank and the heating pan, the control unit controls the waste liquid supply pump to concentrate The waste liquid treatment apparatus according to claim 1, wherein the waste liquid is introduced into the heating pan before the start of the process, and the waste liquid is additionally supplied to the heating pot during the concentration step.   Further, an antifoam agent tank for storing an antifoaming agent, an additive tank for storing an additive, and an antifoaming agent supply installed in an antifoaming agent communication means for communicating the antifoaming agent tank and the heating pan. An additive supply pump installed in an additive communication means for communicating the additive tank and the heating pan, and the control unit includes the defoamer supply pump, the additive supply pump, The waste liquid treatment apparatus according to claim 1, wherein an antifoaming agent and an additive are introduced into the heating pan by controlling   The waste liquid treatment apparatus according to any one of claims 1 to 3, further comprising a vapor condensing device communicating with the heating pan for condensing vapor evaporated from the heated waste liquid. A method for manufacturing a waste liquid treatment apparatus, comprising:
A rice cooking pot for containing waste liquid, a lid for sealing the rice cooking pot, an electric heating means provided on the outside of the rice cooking pot, a temperature sensor for detecting the temperature of the rice cooking pot, and the temperature sensor Preparing an electric rice cooker comprising a control unit for controlling the heating means based on detection of temperature;
The controller heats the waste liquid until the temperature sensor detects a predetermined temperature higher than 115 ° C., and concentrates the waste liquid. After the concentration process, a predetermined heating pause time is determined. A program for the control unit to execute a drying step in which a step of decreasing the temperature of the waste liquid by stopping heating or reducing a heating output and a step of reheating the waste liquid to the predetermined temperature are repeated a predetermined number of times. A method of manufacturing a dehydrator.

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