JP2006305418A - Desalting and dewatering method of garbage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desalting and dewatering method to provide high-quality garbage as a raw material for a succeeding processes of drying, composting and carbonizing treatments, by crushing garbage and desalting salts uniformly to a low concentration in a short time. <P>SOLUTION: In this desalting and dewatering method, garbage is crushed together with water; the garbage is desalted and dewatered by rotating the basket of a centrifugal dewatering device at a first given speed; separated water by centrifugal dewatering is circulated and dewatered by being absorbed in the garbage; a variation ratio of an electric conductivity (EC) of the separated water is measured; circulation to the centrifugal dewatering device is stopped when the variation ratio has decreased to a given value or lower; and the speed of the basket of the centrifugal dewatering device is switched to a second given speed faster than the first speed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention is an invention relating to a desalting and dehydrating method in which raw garbage (food residue) from restaurants, food processing factories, schools and the like is pulverized to remove salt classification.

At present, when organic waste such as raw garbage is dried, composted and carbonized, the pulverized and dehydrated material is used as it is as a raw material for drying, composting and carbonization.

As described in Patent Document 1 and Patent Document 2, an invention of a garbage disposal method capable of desalting and dewatering garbage is disclosed.
Patent Publication 2002-186944 Patent Publication 2001-10883

However, the invention described in Patent Document 1 does not have a pulverization step and does not pulverize garbage, and separately throws garbage and water (washing water) into the apparatus so that the contact area and contact time between garbage and water are as follows. Therefore, the desalting process may take a long time and the desalting process may be insufficient. In addition, it cannot be determined that the desalting process has been sufficiently performed, and the desalting process may be insufficient or excessive.

Further, the invention described in Patent Document 2 is for demineralization and dehydration by dewatering the crushed garbage with a piston, then absorbing water into the garbage, dehydrating again, and repeating this dehydration and water absorption. Because the desalting process takes a long time and the desalination and dehydration by the piston, there is a difference in the contact area and contact time between garbage and water in the garbage, and the salt classification is uniformly removed to a low concentration. It is difficult.

Therefore, the present invention increases the contact area between the garbage and water by crushing the garbage with water using a disposer, and desalinization and dehydration by simultaneously dehydrating the garbage with water by the centrifugal dehydrator. And providing a desalting and dehydrating method that removes salt classification uniformly to a low concentration in a short time by measuring the desorbed liquid (circulating liquid) and controlling the rotation speed. It is intended.

The garbage is pulverized with water, and the garbage is desalted and dehydrated by rotating the basket of the centrifugal dehydrator at the first predetermined rotation speed, the liquid desorbed by centrifugal dehydration is circulated, and the garbage is absorbed. Measure the rate of change in the conductivity (EC) of the liquid that has been dehydrated and desorbed, and stop the circulation to the centrifugal dehydrator when the rate of change reaches a predetermined value or less. The garbage demineralization and dehydration method 1a is characterized in that the basket rotation speed is switched to a second predetermined rotation speed that is faster than the first predetermined rotation speed.

In the second method, the raw garbage is pulverized with water, and the basket of the centrifugal dehydrator is rotated at the first predetermined rotation speed while water is supplied to the crushed raw garbage, so that the salt is dehydrated and dehydrated. The electrical conductivity (EC) of the liquid is measured, and when the electrical conductivity (EC) reaches a predetermined value or less, the circulation to the centrifugal dehydrator unit is stopped, and the basket rotation speed of the centrifugal dehydrator unit is set to the first speed. The garbage demineralization and dehydration system 15a is configured to switch to a second predetermined rotation speed that is faster than the predetermined rotation speed.

Since this invention is the above structure, the following effects are acquired. First, by using a disposer, garbage can be pulverized with water, and by increasing the contact area between the garbage and water, the salt classification remaining in the garbage can be eluted in a short time. it can.

Secondly, even after the end of throwing away the garbage, by circulating or supplying the liquid desorbed to the centrifugal dewatering device, dewatering can be performed at the same time while absorbing the garbage. Desalination dehydration and salt classification can be uniformly removed to low concentrations.

Third, measure the rate of change of the conductivity (EC) of the liquid desorbed from the raw garbage crushed by the centrifugal dehydrator, and stop the circulation of the desorbed liquid when it reaches a predetermined value, By rapidly switching the basket rotation speed of the centrifugal dehydrator to a second predetermined rotation speed that is faster than the first predetermined rotation speed, excessive desalting treatment can be prevented and the processing time can be shortened. In the case of supplying water to the centrifugal dehydrator, the conductivity (EC) value is measured, the water supply is stopped when it reaches a predetermined value or less, and the basket rotation speed of the centrifugal dehydrator is set to the first predetermined value. By quickly switching to the second predetermined rotational speed that is faster than the rotational speed, it is possible to prevent excessive desalting and shorten the processing time.

The removal process of the salt classification remaining in the garbage is shortened, and the method for producing the dehydrated garbage by removing the salt classification uniformly to a low concentration is pulverized with water by the disposer part, and the raw material is removed by the centrifugal dehydrator part. It was realized by configuring the desalting and dehydrating method so that the desalting and dehydrating was performed simultaneously with dewatering while absorbing the waste, and controlled by the change rate or value of the conductivity (EC) of the desorbed liquid.

Below, based on an accompanying drawing, the desalinization dehydration method of the garbage which is this invention is demonstrated in detail.

The desalting centrifugal dewatering apparatus 1 includes a disposer section 2 in which raw garbage flows together with water from a hopper 2a having a tapered lower side, and is pulverized and conveyed by a disposer 2e, and conveyed from the disposer section 2 and pulverized. Centrifugal dehydration unit 3 for desalting and dewatering water containing raw garbage (hereinafter referred to as crushed garbage containing water), and conductivity (EC) of circulating water 4b discharged from the centrifugal dehydration unit 3 A measuring tank that measures the variation rate with the conductivity electrode 4c and the conductivity meter 4d, determines the circulation stop of the circulating water 4b and the switching of the rotation speed of the basket 3c from the measured values, and again injects the circulating water 4b into the disposer 2e. Part 4.

FIG. 1 is an overall view of a desalting type centrifugal dewatering apparatus of the desalting and dewatering method according to the present invention. The desalting-type centrifugal dehydration apparatus 1 includes a disposer section 2, a centrifugal dehydration apparatus section 3, and a measurement tank section 4. The garbage 2b is pulverized together with water by the disposer section 2, and demineralized and dehydrated by the centrifugal dehydration apparatus section 3. The measurement tank unit 4 performs adjustment and confirmation in the apparatus.

The disposer unit 2 is installed on the side surface of the measurement tank unit 4 and pulverizes the garbage 2b together with the circulating water 4b injected from the measurement tank unit 4 by the disposer 2e, and conveys it to the centrifugal dehydrator unit 3 by the pump 2g.

Centrifugal dehydration unit 3 demineralizes and dehydrates the crushed garbage-containing water conveyed together with water from disposer unit 2 by centrifugal force, and discharges demineralized and dehydrated garbage and desorbed liquid 4b to the respective paths. .

The measurement tank unit 4 is installed on the side surface of the centrifugal dehydrator unit 3 and measures the rate of change in the conductivity (EC) of the circulating water 4b discharged from the centrifugal dehydrator unit 3 with the conductivity electrode 4c and the conductivity meter 4d. Then, when the rate of change becomes equal to or less than a predetermined value, it is determined whether to stop circulating water 4b and to switch the rotation speed of basket 3c.

FIG. 2 is an enlarged view of the disposer part of the desalting centrifugal dewatering apparatus according to the desalting and dewatering method of the present invention. The disposer unit 2 includes a hopper 2a, a disposer 2e, a pump 2g, and the like.

The hopper 2a is a container having a tapered lower side. The first circulating water injection path 2c from the measurement tank unit 4 is provided on the side surface, and the injection amount of the circulating water 4b can be adjusted by the first circulating water injection path valve 2i.

A garbage input port 21 is provided on the lower surface of the hopper 2a, and the garbage 2b and the circulating water 4b flow into the disposer 2e.

The disposer 2e is provided on the lower surface of the hopper 2a and has a structure capable of pulverizing and discharging raw garbage together with water. The disposer 2e is contained in the pulverized raw garbage because the contact area between the raw garbage and water is increased. Increased elution of salt into water. The side surface of the disposer 2e is provided with a second circulating water injection path 2d for adding the circulating water 4b, and the injection amount of the circulating water 4b can be adjusted by the second circulating water injection path valve 2j.

The pump 2 g is a pump that conveys crushed garbage-containing water to the centrifugal dehydrator 3. Further, by using a pump having a high conveying capacity, the crushed raw garbage and water are efficiently stirred, and the amount of elution of salt classification contained in the raw garbage increases. The ground garbage-containing water transport path 2f, which is the path connecting the disposer 2e and the centrifugal dehydrator 3, is provided with a bypass path 2h and a bypass path valve 2k, so that a pump having a high transport capability can be used. The amount of crushed garbage-containing water transported to the centrifugal dehydrator 3 can be adjusted by the bypass route valve 2k.

FIG. 3 is an enlarged view of the centrifugal dewatering device portion of the desalting centrifugal dewatering device according to the desalting and dewatering method of the present invention. The centrifugal dewatering device unit 3 includes an injection pipe 3a, a sprinkler 3d, a basket 3c, a motor 3e, a scraper 3b, and the like.

The injection pipe 3a has a thickness of a pipe capable of transporting crushed garbage-containing water and is injected into the watering disc 3d. The injection pipe 3a has a structure that can change the position of injection into the sprinkler 3d.

The water sprinkling board 3d is installed at substantially the center of the basket 3c, and is rotated by the motor 3e to sprinkle the crushed garbage-containing water injected from the injection pipe 3a into the basket 3c. In addition, the rotation speed of the sprinkler 3d is determined by a process in which crushed garbage-containing water is injected (first low-speed rotary desalting dehydration process 7) and a process in which only circulating water is injected (second low-speed rotary desalting dehydration). Step 8) is a low speed rotation (first predetermined rotation speed) from about 400 to 800 rpm.

The basket 3c is a punched stainless steel plate made into a drum shape, and has a structure in which a filter cloth can be attached inside. Further, the basket 3c is rotated by a motor 3e, and the crushed garbage containing water sprinkled from the sprinkler 3d is adhered to the filter cloth, and the liquid detached from the crushed garbage containing water by centrifugal force is filtered and basket. It passes through the punching of 3c and flows out to the drain pipe 3h.

The rotation speed of the basket 3c in the first low-speed rotation desalting / dehydration step 7 is a low-speed rotation from about 400 to 800 rpm, and injection of crushed garbage-containing water in which crushed garbage adhering to the filter cloth is sprinkled from the sprinkler 3d. By simultaneously dewatering while absorbing the garbage, the amount of salt classification that is contained in the crushed garbage adhering to the filter cloth can be increased.

In addition, by disposing the garbage 2b into the disposer unit 2 and injecting only the circulating water 4b into the centrifugal dehydrator unit 3, the ground garbage adhering to the filter cloth is simultaneously dehydrated while absorbing water. There is a second low-speed rotational desalting dehydration step 8 that can perform desalting and dehydration to further increase the amount of elution of.

At the time of the high-speed rotation dehydration step 11, the injection of the circulating water 4b is stopped, and the basket 3c is set to a high-speed rotation (second predetermined rotation speed) from about 1000 to 1600 rpm to adhere to the filter cloth by centrifugal force. The amount of water contained in the crushed raw garbage can be further reduced.

The scraper 3b is composed of a plate that moves up and down and left and right and a fixture that fixes the scraper. By rotating the basket 3c several times and bringing the plate that moves up and down and left and right closer to the basket 3c, the crushed garbage attached to the filter cloth is removed. It can be scraped off and dropped into the garbage discharge path 3g.

FIG. 4 is an enlarged view of a measurement tank portion of a desalting centrifugal dehydration apparatus according to the desalting and dehydrating method of the present invention. The measurement tank unit 4 includes a measurement tank 4a and a conductivity meter 4d.

The measurement tank 4 a is a plastic container, and the first circulating water injection path 2 c and the second circulating water injection path 2 d are installed on the side surface, and the circulating water 4 b can be injected into the disposer part 2. The measurement tank 4a is provided with a desorbed liquid transport path 3i on the upper surface, and can store desorbed liquid 4b flowing out from the centrifugal dehydrator unit 3. In the measurement tank 4a, water is stored before the desalting centrifugal dehydrator 1 is operated.

The conductivity meter 4d is installed on the upper surface of the measurement tank 4a, and is connected to a conductivity electrode 4c for measuring the conductivity (EC) of the circulating water 4b. The conductivity electrode 4c is immersed in the circulating water 4b of the measurement tank 4a.

When the desalting and dehydration process is started, the value of the conductivity meter 4d increases as the desalination of the garbage proceeds, and the change in the value becomes smaller when the desalination is almost complete, and is almost at the end of the desalting. Become flat.

By measuring the rate of change of the conductivity (EC) of the circulating water 4b during the desalting and dewatering treatment, the amount of salt leached into the salt classification water contained in the garbage 2b can be ascertained, and the value of the rate of change When the temperature reaches a predetermined value or less, it is possible to determine whether or not to circulate the circulating water 4b and to switch from the second low-speed rotary desalting / dehydrating step 8 to the high-speed rotating dewatering step 11.

FIG. 5 is a graph showing changes in the conductivity (EC) value of the desalting centrifugal dehydration apparatus of the desalting and dehydrating method according to the present invention, wherein the horizontal axis represents the desalting and dehydrating time, and the vertical axis represents the conductivity (EC). ).

As shown in FIG. 5, since the salt classification eluted from the garbage 2b is concentrated in the circulating water 4b, the change rate of the conductivity (EC) is initially low, and the change rate increases as the elution progresses. The sigmoid curve 13 is drawn so that the rate of change decreases as elution disappears and desalting approaches completion.

Point 13a is the point in time when the elution of the salt classification starts and the rate of change in conductivity (EC) begins to increase, and point 13b is the first low-speed rotational desalination dehydration after the introduction of the garbage 2b into the disposer part 2 is completed. At the end of step 7, point 13c circulates only the circulating water 4b, the elution of salt classification disappears, desalting is completed, and the increase in the rate of change in conductivity (EC) is almost eliminated. This is the end point of the salt dehydration step 8.

The concentration of heavy metal ions in the circulating water 4b was measured with an atomic absorption analyzer, ICP emission photometric analyzer, pack test (simple water quality inspection instrument), etc., and whether there was any heavy metal contained in the garbage 2b. It can be judged, and only the garbage which does not contain heavy metals can be used as a raw material for drying, composting and carbonization, which are the next steps.

FIG. 6 is a table showing the results 14 of the elution test of raw garbage produced by the desalting-type centrifugal dehydrating apparatus 1 of the desalting and dehydrating method according to the present invention by changing the desalting and dehydrating time. The raw garbage 2b as the raw material is the same.

When the desalination dehydration process is finished at the point 13a in the graph of FIG. 5 and the high speed rotation dehydration process is performed, the garbage product A, when the desalination dehydration process is completed at the point 13b and the high speed rotation dehydration process is performed This is the content 14 of the result of the elution test of the garbage product B for the garbage product C in the case where the high-speed rotation dehydration process is performed after the desalination and dehydration process is finished at point 13c.

The result 14 of the elution test of the garbage product is the conductivity (EC) value of the eluate of the garbage product A, the garbage product B, and the garbage product C. 2.07 mS / cm, in the case of the garbage product B, 0.69 mS / cm, and in the case of the garbage product C, it was 0.27 mS / cm.

The electrical conductivity (EC) can be used as an index for determining the degree of salt classification concentration of garbage. If the conductivity value is high, the crop is likely to die and salt damage is likely to occur.

The electrical conductivity (EC) of the garbage product C is the lowest among the garbage products A, B, and C, and is less likely to cause salt damage even when sprayed on the soil. Suitable as raw material for carbonization.

By determining the completion time of the second low-speed rotational desalting dehydration step 8 with reference to the rate of change of conductivity (EC), excessive desalting treatment can be prevented, and uniform drying with less salt classification in a short time It is possible to produce garbage which is a raw material for composting and carbonization.

FIG. 7 is a flowchart showing the flow of the desalting and dehydrating method according to the present invention. The desalting and dewatering method 1a includes a garbage input process 5, a garbage crushing process 6, a first low-speed rotary desalting and dehydrating process 7, a second low-speed rotary desalting and dehydrating process 8, a conductivity determining process 9, and a circulating water stopping process 10. The high-speed rotation dehydration step 11 and the garbage discharge step 12 after the desalting and dehydration treatment.

The garbage throwing-in process 5 is mainly work in the disposer section 2, and the garbage 2b is thrown into the hopper 2a together with the circulating water 4b.

The garbage pulverization step 6 is mainly an operation in the disposer section 2 and pulverizes the garbage 2b together with the circulating water 4b with the disposer 2e.

The first low-speed rotational desalting / dehydrating step 7 is mainly an operation in the centrifugal dewatering device unit 3. The ground garbage containing water is separated from the ground garbage and the desorbed liquid 4b by centrifugal force, and desalted and dehydrated. It can be carried out.

The second low-speed rotational desalting and dewatering step 8 is mainly an operation in the centrifugal dewatering unit 3, and after the input of the raw garbage, only the circulating water 4b is injected to uniformly reduce the salt classification contained in the raw garbage. The concentration can be removed.

The conductivity determination step 9 is mainly an operation in the measurement tank unit 4, and continuously measures the rate of change of the conductivity (EC) of the circulating water 4b, and when the rate of change reaches a predetermined value or less, A stop signal for circulation and a signal for switching from low speed rotation to high speed rotation of the basket 3c are issued. In addition, when the variation rate of the electrical conductivity (EC) does not reach a predetermined value or less, the second low-speed rotation desalination dehydration step 8 is continuously performed.

The circulating water stop process 10 is mainly an operation in the disposer section 2, and the operation of the pump 2g is stopped and the circulation of the circulating water 4b is stopped by a signal from the conductivity determination process 9.

The high-speed rotation dehydration step 11 is mainly an operation in the centrifugal dehydrator unit 3, and the amount of water contained in the garbage is further reduced by starting high-speed rotation of the basket 3c according to the signal from the conductivity determination step 9. be able to.

The garbage discharge step 12 after the desalting and dehydrating process is mainly an operation in the centrifugal dehydrator 3, and is an operation for taking out the garbage after the desalting and dehydrating process from the desalting centrifugal dehydrator 1 by the scraper 3 b. .

  The water supply type desalting centrifugal dewatering device 15 is obtained by changing the water circulation method of the desalting centrifugal dewatering device 1 to a water supply method. As the first water supply path 16a and the second water supply path 16b that connect the circulating water injection path 2d to a tap water faucet or the like, the water supply type disposer section 16 that has been changed to a method of supplying water, and the desalting centrifugal dehydrator 1 The measuring tank unit 4 is changed to a water supply type measuring tank unit 18 which is provided with a drain port 18a and can discharge the desorbed liquid.

FIG. 8 is a diagram of a water supply type desalting centrifugal dewatering apparatus according to the desalting and dewatering method of the present invention. The water supply type desalting centrifugal dewatering device 15 includes a water supply type disposer unit 16, a water supply type centrifugal dehydration device unit 17, and a water supply type measurement tank unit 18. The water supply type disposer unit 16 pulverizes raw garbage together with water. Desalination and dewatering is performed by the centrifugal dehydrator 17. The water supply type measurement tank unit 18 performs adjustment and confirmation in the apparatus.

The water supply type disposer unit 16 is installed on the side surface of the water supply type measurement tank unit 18 and pulverizes raw garbage together with the water supplied from the first water supply path 16a and the second water supply path 16b, and the centrifugal dehydrator unit by the pump. 17 to transport.

The feed water type centrifugal dewatering device unit 17 desalinates and dehydrates the crushed garbage containing water transported together with the water from the feed water type disposer unit 16 by centrifugal force. To discharge.

The water supply type measurement tank unit 18 is installed on the side surface of the water supply type centrifugal dehydration device unit 17, and the conductivity (EC) of the desorbed liquid discharged from the water supply type centrifugal dehydration device unit 17 is determined by a conductivity electrode and a conductivity meter. The measurement is performed, and when it becomes a predetermined value or less, stoppage of water supply from the first water supply path 16a and the second water supply path 16b and switching of the rotation speed of the basket are determined. The desorbed liquid whose conductivity (EC) has been measured is discharged from the drain port 18 a of the water supply type measurement tank unit 18. Further, the discharge amount of the desorbed liquid can be adjusted to the drain port 18a by the drain port valve 18b.

FIG. 9 is a graph showing changes in the conductivity (EC) value of the feed water type desalting centrifugal dehydration apparatus of the desalting and dehydrating method according to the present invention, wherein the horizontal axis is the desalting time and the vertical axis is the conductivity. (EC).

As shown in FIG. 9, in the case of the water supply type, since the transition of the salt classification discharged to the water supply type measurement tank unit 18 appears, the change in the conductivity (EC) value is initially low, and the desalination is not performed. A curve 19 is drawn having a peak that increases as it progresses, decreases as the desalination approaches completion, and returns to the original lower value.

Point 19a is the point when the elution of the salt classification starts and the value of conductivity (EC) begins to rise, point 19b is the point when the introduction of raw garbage into the water supply type disposer section 16 is completed, and point 19c is This is the time when the water supply was continued and the elution of the salt classification disappeared and the desalting was completed and the conductivity (EC) value returned to the original value.

The curves 13 and 19 are different from each other in the graph. However, if the raw garbage is the same, the raw garbage that is desalted and dehydrated at the points 13a, 13b, and 13c and the garbage that is dehydrated at the points 19a, 19b, and 19c. The result of the same elution test is the same as that of salt-dehydrated garbage.

  FIG. 10 is a flowchart showing the flow of the desalting and dewatering method 15a according to the present invention. The desalting and dewatering method 15a includes a garbage input step 20, a garbage crushing step 21, a first low-speed rotational desalting and dehydrating step 22, a second low-speed rotational desalting and dehydrating step 23, a conductivity determining step 24, a water supply stopping step 25, It comprises a high-speed rotary dewatering step 26 and a garbage discharge step 27 after the desalting and dewatering treatment.

The garbage input process 20 is mainly an operation in the water supply type disposer unit 16 and inputs the garbage together with the supplied water into the hopper.

The garbage pulverizing step 21 is mainly an operation in the water supply type disposer unit 16 and pulverizes the garbage together with the water supplied with the disposer.

The first low-speed rotary desalting and dewatering step 22 is mainly an operation in the water supply type centrifugal dewatering device unit 17, and pulverized garbage containing water is separated from the pulverized garbage and the desorbed liquid by centrifugal force, and desalted and dehydrated. It can be performed.

The second low-speed rotational desalting and dewatering step 23 is mainly an operation in the feed water type centrifugal dewatering device unit 17, and the supply of water after the end of the input of the raw garbage allows the salt classification contained in the raw garbage to be uniformly reduced to a low concentration. Can be removed.

The conductivity determination step 24 is mainly an operation in the water supply type measurement tank unit 18, and continuously measures the value of the conductivity (EC) of the desorbed liquid, and when the value reaches a predetermined value or less, the water supply stop signal is given. And a signal for switching from low speed rotation of the basket to high speed rotation. In addition, when the value of electrical conductivity (EC) has not reached below a predetermined value, the 2nd low-speed rotation desalination dehydration process 23 is continued.

The water supply stop process 25 is an operation mainly in the water supply type disposer section 16, and the stop of water supply and the operation of the pump are stopped by a signal from the conductivity determination process 24.

The high-speed rotation dehydration step 26 is mainly an operation in the water supply type centrifugal dehydrator unit 17, and the amount of water contained in the garbage is further reduced by starting the high-speed rotation of the basket at the signal of the conductivity determination step 24. can do.

The garbage discharge step 27 after the desalting and dewatering process is mainly an operation in the feed water type centrifugal dehydrator unit 17, and the garbage after the desalting and dewatering process is taken out from the feed water type desalting type centrifugal dehydrator 15 by a scraper. Work.

By desalting the salt classification in the raw garbage uniformly to a low concentration in a short time, it becomes possible to produce raw garbage as a raw material for high quality drying, composting and carbonization with little salt damage in a short time.

1 is an overall view of a desalting-type centrifugal dehydrating apparatus according to a desalting and dehydrating method according to the present invention. It is an enlarged view of the disposer part of the desalination type centrifugal dehydration apparatus by the desalination dehydration method which is this invention. It is an enlarged view of the centrifugal dewatering device part of the desalting centrifugal dewatering device by the desalting and dewatering method according to the present invention. It is an enlarged view of the measurement tank part of the desalination type | formula centrifugal dehydration apparatus by the desalination dehydration method which is this invention. It is a graph which shows the change of the electrical conductivity value of the desalination type | formula centrifugal dehydration apparatus by the desalination dehydration method which is this invention. It is a table | surface which shows the result of the elution test of the garbage which desalted and dehydrated with the desalting-type centrifugal dehydration apparatus of the desalting dehydration method which is this invention. It is a flowchart which shows the flow of the desalting dehydration method 1a which is this invention. It is a figure of the water supply type desalination type | formula centrifugal dehydration apparatus by the desalination dehydration method which is this invention. It is a table | surface which shows the result of the elution test of the garbage which desalted and dehydrated with the feed-water type desalination type | formula centrifugal dehydration apparatus of the desalination dehydration method which is this invention. It is a flowchart which shows the flow of the desalting dehydration system 15a which is this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Desalination type centrifugal dehydration apparatus 1a Desalination dehydration method 2 Disposer part 2a Hopper 2b Garbage 2c 1st circulating water injection path 2d 2nd circulating water injection path 2e Disposer 2f Ground garbage containing water conveyance path 2g Pump 2h Bypass path 2i First circulating water injection path valve 2j Second circulating water injection path valve 2k Bypass path valve 2l Garbage inlet 3 Centrifugal dehydrator 3a Injection pipe 3b Scraper 3c Basket 3d Sprinkler 3e Motor 3f Base 3g Garbage discharge path 3h Drainage pipe 3i Desorption liquid transport path 4 Measurement tank 4a Measurement tank 4b Circulating water or desorption liquid 4c Conductivity electrode 4d Conductivity meter 5 Garbage input process 6 Garbage crushing process 7 First low-speed rotation desalination dehydration process 8 Second low-speed rotation desalination dehydration process 9 Conductivity determination process 10 Circulating water stop process 11 High-speed rotation dehydration process 12 Desalination Garbage discharge step 13 curves 13a point 13b points dissolution test 13c points 14 garbage product results 15 water type desalination centrifugal dehydrator 15a desalination dehydration method after the hydrothermal treatment
16 Water supply type disposer part 16a 1st water supply path 16b 2nd water supply path 17 Water supply type centrifugal dehydrator part 18 Water supply type measurement tank part 18a Drain port 18b Drain port valve 19 Curve 19a Point 19b Point 19c Point 20 Raw garbage input process 21 Waste crushing step 22 First low-speed rotational desalting dehydration step 23 Second low-speed rotational desalting dehydration step 24 Conductivity determination step 25 Water supply stop step 26 High-speed rotational dehydration step 27 Raw garbage discharging step after desalting dehydration treatment

Claims (2)

The garbage is pulverized with water, and the garbage is desalted and dehydrated by rotating the basket of the centrifugal dehydrator at the first predetermined rotation speed, the liquid desorbed by centrifugal dehydration is circulated, and the garbage is absorbed. Measure the rate of change in the conductivity (EC) of the liquid that has been dehydrated and desorbed, and stop the circulation to the centrifugal dehydrator when the rate of change reaches a predetermined value or less. A method for desalinating and dewatering raw garbage, wherein the basket rotation speed is switched to a second predetermined rotation speed that is faster than the first predetermined rotation speed. The debris is demineralized and dewatered by rotating the basket of the centrifugal dewatering unit at a first predetermined rotation speed while water is pulverized with water and the crushed garbage is fed, and the conductivity (EC) of the desorbed liquid. When the electrical conductivity (EC) reaches a predetermined value or less, the circulation to the centrifugal dehydrator unit is stopped, and the basket rotation speed of the centrifugal dehydrator unit is set to be higher than the first predetermined rotation number. A method for desalinating and dewatering garbage by switching to a predetermined number of revolutions.

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