Kitchen garbage desalting device and method

Abstract

The kitchen garbage desalting device comprises a support, a desalting tank is fixedly installed on the support, a liquid discharging pipe is communicated with the bottom of the desalting tank, a discharging pipe is arranged in the desalting tank, the upper end of the discharging pipe is fixedly connected with a sealing cover, a pipe opening in the lower end of the discharging pipe penetrates through the desalting tank and then is connected with a belt conveyor, and the two ends of the discharging pipe are communicated with filter pipes respectively. A spiral shaft is arranged in the filter pipe, one end of the spiral shaft penetrates through the desalting tank and is in transmission connection with a speed reducing motor on the fixed mounting bracket, a feeding hopper is arranged at one end, far away from the discharging pipe, of the filter pipe, and a piston box is arranged in the discharging pipe and is connected with a pushing air cylinder mounted on the sealing cover. The kitchen garbage desalting equipment is used for solving the problem that existing kitchen garbage desalting equipment is poor in desalting effect.

Description

Technical Field

[0001] The invention relates to the field of organic waste treatment, and in particular to a kitchen waste desalination device and method. Background Art

[0002] Kitchen waste accounts for nearly half of domestic waste, and mainly includes rice, flour, vegetables, oil, bones and other materials. The residual nutritional value is high, and organic fertilizer can be obtained by fermenting it. However, fermentation does not remove the salt in kitchen waste. If the salt content in the fertilizer is too high, it will cause soil salinization, reduce composting efficiency, and affect microbial activity. Therefore, kitchen waste needs to be desalinated.

[0003] The existing kitchen waste desalination is carried out by spraying and flushing desalination, such as the patents "CN215587466U, a kitchen waste desalination device" and "CN211839521U, a kitchen waste desalination and degreasing treatment system". The disadvantage of spraying and flushing desalination is that the kitchen waste is in a wet state before entering the desalination device. The wet waste contains a large amount of water, grease and salt, and the surface of the waste is covered with an oil film. If the waste is sprayed directly, most of the water flow only acts on the surface of the waste, and the salt and grease inside the waste cannot be quickly flushed out. The treated waste still contains excessive salt, so the desalination effect is not good. Summary of the invention

[0004] The object of the present invention is to provide a kitchen waste desalination device and method, so as to solve the problem that the existing kitchen waste desalination equipment has poor desalination effect.

[0005] In order to solve the above problems, the technical solution of the present invention is:

[0006] A kitchen waste desalination device comprises a bracket, on which a desalination tank is fixedly installed, a liquid discharge pipe is connected to the bottom of the desalination tank, a discharge pipe is arranged in the desalination tank, the upper end of the discharge pipe is fixedly connected to a sealing cover, the lower end of the pipe mouth passes through the desalination tank and is connected to a belt conveyor, filter tubes are respectively connected at both ends of the discharge pipe, a spiral shaft is arranged in the filter tube, one end of the spiral shaft passes through the desalination tank and is transmission-connected to a reduction motor on the fixed mounting bracket, a feed hopper is arranged at one end of the filter tube away from the discharge pipe, a piston box is arranged in the discharge pipe, and the piston box is connected to a pushing cylinder installed on the sealing cover.

[0007] Preferably, openings connected to the filter tube are respectively provided on both sides of the piston box, and a circular top cover corresponding to the filter tube is installed in the opening, a skirt is provided on the edge of the top cover, and a plurality of guide holes are opened on the skirt. A plurality of guide rods are fixedly connected in the piston box, and the guide holes are installed on the guide rods. The two top covers are connected by a double-axis cylinder, and the double-axis cylinder pushes the two top covers into the filter tube, and a limit tube is arranged on the outer sleeve of the guide rod.

[0008] Preferably, a weighing sensor is provided between the limiting tube and the skirt.

[0009] Preferably, it also includes a water tank, the bottom of which is connected to the desalination tank through a water inlet pipe, and an electric heater is installed at the bottom of the water tank.

[0010] Preferably, the lower end of the discharge pipe is connected to two branch pipes, on which a first solenoid valve and a second solenoid valve are respectively installed, a third solenoid valve is installed on the water inlet pipe, an extrusion magnetic switch and a discharge magnetic switch are installed on the pushing cylinder, a high liquid level switch, a low liquid level switch and a temperature sensor are installed on the water tank, a full liquid level switch and a salinity sensor are installed on the desalination tank, and a controller is also included. The extrusion magnetic switch, the discharge magnetic switch, the weighing sensor, the high liquid level switch, the low liquid level switch, the temperature sensor, the salinity sensor and the full liquid level switch transmit the detected signals to the controller, and the controller controls the opening and closing of the first solenoid valve, the second solenoid valve and the third solenoid valve, and controls the forward and reverse rotation of the reduction motor.

[0011] Preferably, an aeration pipe is provided in the desalination tank below the filter tube, and a plurality of aeration heads are installed on the aeration pipe.

[0012] Preferably, the bottom surface of the desalination tank is an inclined surface, and the drainage pipe is connected to the lower end of the inclined surface.

[0013] A method for a kitchen waste desalination device comprises the following steps:

[0014] Initially, the piston box is located between the two filter tubes, the electric heater heats the water in the water tank to above 70°C, the first solenoid valve is opened, and the second solenoid valve of the branch pipe is closed;

[0015] S1: After the kitchen waste is put into the filter tube from the feed hopper, the spiral shaft pushes the kitchen waste forward to squeeze and dehydrate it. The swill squeezed out of the kitchen waste flows into the oil-water pool after passing through the first solenoid valve, and then the first solenoid valve is closed;

[0016] S2: After the desalination tank is filled with hot water, the spiral shaft drives the food waste to move backward, and then the double-shaft cylinder pushes the top cover to move into the filter tube to push the food waste in the material storage section of the filter tube toward the spiral shaft;

[0017] S3: The spiral shaft rotates alternately forward and reversely to repeatedly squeeze the kitchen waste to dilute the salt in the kitchen waste;

[0018] S4: When the salinity sensor detects that the salinity of the water in the desalination tank reaches a second preset value, the water in the desalination tank flows into the water purification tank through the second solenoid valve;

[0019] S5: After the water in the desalination tank is drained, the double-shaft cylinder pulls back the top cover, and then the spiral shaft drives the food waste to feed to squeeze out the water in the food waste;

[0020] S6: The push cylinder pulls the piston box upward to move away from between the two filter tubes, and the spiral shaft sends the kitchen waste into the discharge pipe and falls onto the belt conveyor, which then sends the kitchen waste to the next processing unit;

[0021] S7: Adding kitchen waste into the filter tube again, and after the newly added kitchen waste pushes out the kitchen waste in the material storage section of the filter tube, the initial state is restored, and the newly added kitchen waste is desalted according to the above steps S1 to S7.

[0022] Preferably, when proceeding to step S4, when the salinity sensor detects that the salinity of the water in the desalination tank reaches the second set value, the salinity sensor continues to detect for 5 to 10 minutes. If the salinity does not rise to the third preset value, the water in the desalination tank is discharged into the water purification tank and the process proceeds to the next step. If the salinity rises to the third preset value, the water in the desalination tank is first drained, and the water is sent to the desalination tank again, and the kitchen waste is desalinated again according to the method of step S3.

[0023] The beneficial effect of the present invention is that after the garbage is put into the filter tube, the water and grease in the garbage are squeezed out first, so that the garbage itself has a certain water absorption capacity, and then the garbage is completely immersed in hot water, and the garbage is repeatedly squeezed to drain water and absorb water, and the water flow is used to repeatedly flush the inside of the garbage to wash away the salt and grease in the garbage, which can greatly improve the desalination effect of the garbage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 is a schematic diagram of the cross-sectional structure of the present invention,

[0026] Figure 2 It is a schematic diagram of the top view structure of the present invention,

[0027] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0028] Figure 4 This is a schematic diagram of the main structure of the piston box of the present invention.

[0029] Figure 5 for Figure 4 Schematic diagram of the cross-section structure at BB in the middle.

[0030] Figure 6 Schematic diagram of the connection relationship of various electrical components of the present invention.

[0031] In the figure: bracket 100, reduction motor 101, feed hopper 200, filter tube 201, screw shaft 202, desalination tank 300, discharge pipe 301, first solenoid valve 302, second solenoid valve 303, aeration pipe 304, aeration head 305, liquid full level switch 306, salinity sensor 307, discharge pipe 400, cover 401, discharge magnetic switch 402, extrusion magnetic switch 403, push cylinder 404, top cover 405, piston box 406, double-axis cylinder 407, guide rod 408, limit tube 409, weighing sensor 410, skirt 411, belt conveyor 500, water tank 600, temperature sensor 601, high liquid level switch 602, low liquid level switch 603, electric heater 604, third solenoid valve 605. DETAILED DESCRIPTION

[0032] like Figures 1 to 6 As shown, a kitchen waste desalination device includes a bracket 100, a desalination tank 300 is fixedly mounted on the bracket 100, a drain pipe 301 is connected to the bottom of the desalination tank 300, a square discharge pipe 400 is arranged in the desalination tank 300, the upper end of the discharge pipe 400 is fixedly connected to a cover 401, and the lower end of the pipe mouth passes through the desalination tank 300 and is connected to a belt conveyor 500, and filter pipes 201 are connected to both ends of the discharge pipe 400, and a spiral shaft 201 is arranged in the filter pipe 201. 02, one end of the spiral shaft 202 passes through the desalination tank 300 and is connected to the reduction motor 101 on the fixed mounting bracket 100. A feed hopper 200 is provided at one end of the filter tube 201 away from the discharge pipe 400. A piston box 406 is provided in the discharge pipe 400. The piston box 406 is connected to a pushing cylinder 404 installed on the cover 401. The pushing cylinder 404 drives the piston box 406 to move up and down in the discharge pipe 400 to open and close the pipe opening at one end of the filter tube 201.

[0033] Openings corresponding to the filter tube 201 are respectively provided on both sides of the piston box 406, and a circular top cover 405 corresponding to the filter tube 201 is installed in the opening. A skirt 411 is provided on the edge of the top cover 405, and four guide holes are opened on the skirt 411. The guide holes are evenly distributed around the axis of the top cover 405. A plurality of guide rods 408 are fixedly connected in the piston box 406, and the guide holes are installed on the guide rods 408. The two top covers 405 are connected by a double-axis cylinder 407, and the double-axis cylinder 407 pushes the two top covers 405 into the filter tube 201. A limit tube 409 is sleeved on the guide rod 408, and the limit tube 409 and the guide rod 408 are connected and fixed by plug welding.

[0034] The filter tube 201 is divided into an extrusion section and a material storage section. The spiral shaft 202 is located in the extrusion section. Since one end of the spiral shaft does not extend into the material storage section, the garbage squeezed into the material storage section can only be pushed forward by the garbage behind it and cannot move backward. In order to allow the garbage to be entangled by the spiral shaft, a movable top cover 405 is provided. When the spiral shaft needs to drive the garbage to move backward, the double-axis cylinder 407 drives the top cover 405 to enter the filter tube 201 to slowly push the garbage toward the spiral shaft so that it can be entangled by the spiral shaft 202.

[0035] The function of the guide rod 408 is to limit the moving direction of the top cover 405 to prevent the top cover 405 from being tilted.

[0036] The function of the limit tube 409 is to limit the position of the double-axis cylinder 407 to prevent it from being pushed back excessively by garbage and being damaged;

[0037] A weighing sensor 410 is provided between the stop tube 409 and the skirt 411. The weighing sensor 410 detects the pressure applied to the top cover 405 by the garbage.

[0038] It also includes a water tank 600, the bottom of which is connected to the desalination tank 300 through a water inlet pipe, and an electric heater 604 is installed at the bottom of the water tank 600, and the position of the water tank 600 is higher than the desalination tank 300. After the water in the water tank 600 is poured into the desalination tank 300, the desalted water is immediately poured into the water tank 600, and then the electric heater 604 is started, so that the desalination device desalinates the garbage while the electric heater 604 heats the water in the water tank 600 to improve the desalination efficiency; in addition, the purpose of using hot water to desalinate the garbage is that the kitchen waste contains animal fat, which is in a solidified state at low temperatures, and hot water can melt the fat to ensure the desalination effect of the garbage.

[0039] The lower end of the discharge pipe 301 is connected with two branch pipes, a third solenoid valve 605 is installed on the water inlet pipe, an extrusion magnetic switch 403 and a discharge magnetic switch 402 are installed on the push cylinder 404, a high liquid level switch 602, a low liquid level switch 603 and a temperature sensor 601 are installed on the water tank 600, a full liquid level switch 306 and a salinity sensor 307 are installed on the desalination tank 300, and a controller is also included. The extrusion magnetic switch 403, the discharge magnetic switch 402, the weighing sensor 410, the high liquid level switch 602, the low liquid level switch 603, the temperature sensor 601, the salinity sensor 307 and the full liquid level switch 306 transmit the detected signals to the controller, and the controller controls the opening and closing of the first solenoid valve 302, the second solenoid valve 303 and the third solenoid valve 605, and controls the forward and reverse rotation of the reduction motor 101 and the extension and retraction of the push cylinder 404.

[0040] The controller is a PLC controller, which can realize automatic desalination of kitchen waste, improve desalination efficiency, and reduce the labor intensity of workers. The high liquid level switch 602 and the low liquid level switch 603 are used to detect the water level in and out of the water tank 600. When the water level in the water tank 600 is at a low level, a water supply pipe will fill the water into the water tank. When the water is filled to trigger the high liquid level switch 602, the water supply will stop. The source of the water in the water tank 600 is tap water or water treated by a water treatment system; the temperature sensor 601 is used to detect the water temperature in the water tank 600 in real time, and cooperate with the controller to control the opening and closing of the electric heater 604 to maintain the water temperature in the water tank 600 above 70°C.

[0041] An aeration pipe 304 is provided in the desalination tank 300 below the filter tube 201, and a plurality of aeration heads 305 are installed on the aeration pipe 304. When desalting the garbage, the bubbles generated by the aeration heads 305 stir the hot water to improve the desalination effect.

[0042] The bottom surface of the desalination tank 300 is an inclined surface, and the drain pipe 301 is connected to the lower end of the inclined surface. The inclined surface can facilitate drainage.

[0043] A method for a kitchen waste desalination device comprises the following steps:

[0044] Initially, the push cylinder 404 triggers the extrusion magnetic switch 403, the piston box 406 is located between the two filter tubes 201, and the pipe openings at one end of the two filter tubes 201 are blocked by the piston box 406. The electric heater 604 heats the water in the water tank 600 to above 70°C, there is no water in the desalination tank 300, the first solenoid valve 302 is opened, and the second solenoid valve 303 is closed; the branch pipe in which the first solenoid valve 302 is installed is connected to the oil-water pool, and the other branch pipe is connected to the water treatment system (the oil-water pool and the water treatment system are not drawn in the figure).

[0045] S1: After the kitchen waste is put into the filter tube 201 from the feed hopper 200, the controller controls the reduction motor 101 to drive the screw shaft to rotate forward, so that the kitchen waste moves toward the piston box 406. The waste moving forward is blocked by the piston box 406 and is squeezed and dehydrated. At the same time, the weighing sensor 410 detects the squeezing pressure in real time. When the pressure reaches a first preset value (the first preset value is, for example, 0.7 tons), it indicates that the water and grease in the swill are squeezed out. Then the controller controls the reduction motor 101 to pause, and the swill squeezed out of the kitchen waste flows into the oil-water pool after passing through the first solenoid valve 302. After the swill in the desalination tank 300 is emptied, the first solenoid valve 302 of the controller is closed;

[0046] The swill squeezed out for the first time contains most of the salt and grease in the garbage. If the swill squeezed out for the first time is sent to the water treatment system, it will greatly increase the processing burden of the water treatment system and increase the processing cost. For this reason, the swill squeezed out for the first time and the swill squeezed out subsequently are discharged separately. For example, the swill squeezed out for the first time is sent to the oil water pool for standing, and the grease floating on the swill pool is used to produce biodiesel. In this way, there will be less grease in the swill squeezed out by the second flushing of the garbage, which can facilitate the subsequent water treatment system to filter, desalinate and remove oil for discharge, thereby reducing the use of consumables and chemicals in the water treatment system.

[0047] S2: The controller controls the third solenoid valve 605 to open, and the hot water in the water tank 600 flows into the desalination tank 300. When the water level reaches the full liquid level switch 306, the filter tube 201 is completely immersed in the hot water. Then the controller controls the reduction motor 101 to drive the spiral shaft 202 to reverse, so as to move the kitchen waste backwards. Then the double-axis cylinder 407 pushes the top cover 405 to move into the filter tube 201, so as to push the kitchen waste in the material storage section of the filter tube 201 that the spiral shaft 202 cannot reach toward the spiral shaft, so that the waste in the material storage section can move toward the feed hopper 200.

[0048] S3: Then the controller screw shaft 202 alternately repeats forward and reverse rotation, so that the kitchen waste is repeatedly squeezed and drained and water is absorbed in the filter tube 201. During the drainage and water absorption process, the hot water impacts the salt and grease inside the waste, so that they can be quickly precipitated and merged into the hot water, so that the salt and grease in the waste can be quickly and thoroughly removed;

[0049] S4: When the salinity sensor 307 detects that the salinity of the water in the desalination tank 300 reaches a second preset value (for example, 4%), the controller controls the second solenoid valve 303 to open, and the water in the desalination tank 300 flows into the water purification pool through the second solenoid valve 303;

[0050] S5: After the water in the desalination tank 300 is drained, the double-shaft cylinder 407 pulls back the top cover 405, and then the spiral shaft drives the food waste to be fed to squeeze out the water in the food waste;

[0051] S6: the push cylinder 404 pulls the piston box 406 upward. When the push cylinder 404 moves upward to trigger the discharge magnetic switch 402, the controller controls the push cylinder 404 to stop. At this time, the piston box 406 moves away from between the two filter tubes 201, and then the two spiral shafts send the kitchen waste into the discharge pipe 400, and then fall on the belt conveyor 500, and the belt conveyor 500 sends the kitchen waste to the next processing unit (the next processing unit is such as a fermentation tank);

[0052] S7: Add kitchen waste into the filter tube 201 again. After the newly added kitchen waste pushes out the kitchen waste in the storage section of the filter tube 201, the initial state is restored and the newly added kitchen waste is desalinated according to the above steps S1 to S7.

[0053] When proceeding to step S4, when the salinity sensor 307 detects that the salinity of the water in the desalination tank 300 reaches the second set value, the salinity sensor 307 continues to detect for 5 to 10 minutes. If the salinity does not rise to the third preset value (the second preset value, for example: 7%), the water in the desalination tank 300 is discharged into the water purification tank and proceeds to the next step. If the salinity rises to the third preset value, the water in the desalination tank 300 is first drained, and then the water in the water tank 600 is sent to the desalination tank 300 again, and the kitchen waste is desalinated again according to the method of step S3.

[0054] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A kitchen waste desalination device, characterized in that: The invention comprises a support (100), a desalination tank (300) is fixedly mounted on the support (100), a liquid discharge pipe (301) is connected to the bottom of the desalination tank (300), a discharge pipe (400) is arranged in the desalination tank (300), an upper end of the discharge pipe (400) is fixedly connected to a sealing cover (401), a lower end of the discharge pipe (400) passes through the desalination tank (300) and is connected to a belt conveyor (500), and filter pipes ( 201), a spiral shaft is provided in the filter tube (201), one end of the spiral shaft passes through the desalination tank (300) and is transmission-connected to a reduction motor (101) on a fixed mounting bracket (100), a feed hopper (200) is provided at one end of the filter tube (201) away from a discharge pipe (400), a piston box (406) is provided in the discharge pipe (400), and the piston box (406) is connected to a push cylinder (404) installed on a sealing cover (401).

2. A kitchen waste desalination device according to claim 1, characterized in that: Openings corresponding to the filter tube (201) are respectively provided on both sides of the piston box (406), and a circular top cover (405) is installed in the opening. The edge of the top cover (405) is provided with a circle of skirt (411), and a plurality of guide holes are opened on the skirt (411). A plurality of guide rods (408) are fixedly connected in the piston box (406), and the guide holes are installed on the guide rods (408). The two top covers (405) are connected by a double-axis cylinder (407), and the double-axis cylinder (407) pushes the two top covers (405) into the filter tube (201), and a limit tube (409) is sleeved on the guide rod (408).

3. A kitchen waste desalination device according to claim 2, characterized in that: A weighing sensor (410) is provided between the position limiting tube (409) and the skirt (411).

4. A kitchen waste desalination device according to claim 2 or 3, characterized in that: It also includes a water tank (600), the bottom of the water tank (600) is connected to the desalination tank (300) through a water inlet pipe, and an electric heater (604) is installed at the bottom of the water tank (600).

5. A kitchen waste desalination device according to claim 4, characterized in that: The lower end of the liquid discharge pipe (301) is connected to two branch pipes, on which a first solenoid valve (302) and a second solenoid valve (303) are respectively installed, a third solenoid valve (605) is installed on the water inlet pipe, a material extrusion magnetic switch (403) and a material discharge magnetic switch (402) are installed on the push cylinder (404), a high liquid level switch (602), a low liquid level switch (603) and a temperature sensor (601) are installed on the water tank (600), and a full liquid level switch (306) and a salinity sensor (306) are installed on the desalination tank (300). 07), and also includes a controller, wherein the extrusion magnetic switch (403), the discharge magnetic switch (402), the weighing sensor (410), the high liquid level switch (602), the low liquid level switch (603), the temperature sensor (601), the salinity sensor (307) and the full liquid level switch (306) transmit the detected signals to the controller, and the controller controls the opening and closing of the first solenoid valve (302), the second solenoid valve (303) and the third solenoid valve (605), and controls the forward and reverse rotation of the reduction motor (101) and the extension and retraction of the push cylinder (404).

6. A kitchen waste desalination device according to any one of claims 1 to 5, characterized in that: An aeration pipe (304) is provided in the desalination tank (300) below the filter tube (201), and a plurality of aeration heads (305) are installed on the aeration pipe (304).

7. A kitchen waste desalination device according to any one of claims 1 to 5, characterized in that: The bottom surface of the desalination tank (300) is an inclined surface, and the drainage pipe (301) is connected to the lower end of the inclined surface.

8. A method for using the kitchen waste desalination device according to claim 5, characterized in that: The following steps are included: Initially, the piston box (406) is located between the two filter tubes (201), the electric heater (604) heats the water in the water tank (600) to above 70°C, the first solenoid valve (302) is opened, and the second solenoid valve (303) of the branch pipe is closed; S1: After the kitchen waste is fed from the feed hopper (200) into the filter tube (201), the spiral shaft pushes the kitchen waste forward to be squeezed and dehydrated, and the swill squeezed out of the kitchen waste flows into the oil-water pool after passing through the first solenoid valve (302), and then the first solenoid valve (302) is closed; S2: After the desalination tank (300) is filled with hot water, the spiral shaft drives the kitchen waste to move backward, and then the double-shaft cylinder (407) pushes the top cover (405) to move into the filter tube (201) to push the kitchen waste in the material storage section of the filter tube (201) toward the spiral shaft; S3: The spiral shaft rotates alternately forward and reversely to repeatedly squeeze the kitchen waste to dilute the salt in the kitchen waste; S4: When the salinity sensor (307) detects that the salinity of the water in the desalination tank (300) reaches a second preset value, the water in the desalination tank (300) flows into the water purification tank through the second solenoid valve (303); S5: After the water in the desalination tank (300) is drained, the double-shaft cylinder (407) pulls back the top cover (405), and then the spiral shaft drives the food waste to be fed to squeeze out the water in the food waste; S6: the push cylinder (404) pulls the piston box (406) upward to move away from between the two filter tubes (201), and the spiral shaft sends the kitchen waste into the discharge pipe (400) and falls onto the belt conveyor (500), and the belt conveyor (500) sends the kitchen waste to the next processing unit; S7: kitchen waste is added to the filter tube (201) again, and the newly added kitchen waste pushes out the kitchen waste in the storage section of the filter tube (201), and then the initial state is restored, and the newly added kitchen waste is desalinated according to the above steps S1 to S7.

9. A method for desalting kitchen waste according to claim 8, characterized in that: When the step S4 is reached, when the salinity sensor (307) detects that the salinity of the water in the desalination tank (300) reaches the second set value, the salinity sensor (307) continues to detect for 5 to 10 minutes. If the salinity does not rise to the third preset value, the water in the desalination tank (300) is discharged into the water purification tank and the next step is entered. If the salinity rises to the third preset value, the water in the desalination tank (300) is first drained, and the water is sent to the desalination tank (300) again, and the kitchen waste is desalinated again according to the method of step S3.

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