JP6703766B2 - How to operate the drum type concentrator - Google Patents

Description

The present invention relates to a method for operating a drum type concentrator, in particular, in order to make the concentration of sludge discharged from the terminal side constant, the sludge storage time and the drainage efficiency of the filtrate are adjusted to adjust the concentration of sludge. The present invention relates to a method for operating a drum type concentrator that is controlled within a predetermined range.

BACKGROUND ART Conventionally, a belt-type concentrator or a drum-type concentrator for concentrating organic sludge such as sewage, night soil, or food processing wastewater is generally known. A belt type concentrator or a drum type concentrator is a device for continuously concentrating sludge, continuously supplying sludge to the device, and continuously discharging concentrated sludge from the device.

As disclosed in Patent Document 1, an endless belt made of resin is hung between sprockets, sludge is supplied onto a belt in the vicinity of one of the sprockets, and solid-liquid separation is performed by the endless belt while conveying to the other sprockets. Belt type concentrators for obtaining concentrated sludge are known.

As disclosed in Patent Document 2, in a drum-type dehydrator in which sludge is conveyed by a screw shaft around which spiral screw blades are wound and is concentrated by a cylindrical filter medium, punching metal or the like on a cylindrical peripheral surface is used. A drum type concentrator composed of the above metal filter medium is known.

As disclosed in Patent Document 3, in a drum-type dehydrator in which sludge is conveyed by a screw shaft around which spiral screw blades are wound and concentrated by a cylindrical outer cylinder screen, The operation control method for controlling the screw shaft rotation speed and the rotation speed of the outer cylinder screen is known.

JP 2002-253910 A Japanese Patent No. 3832330 Japanese Patent No. 4427798

The characteristics of organic sludge such as sewage, night soil, and food production and processing wastewater are changing every moment depending on the season, weather, time and the like. Various controls were performed on the operation of the concentrator or the conditioning of the sludge according to this fluctuation.

In the belt-type concentrator as in Patent Document 1, when solid-liquid separation is performed, it is stable when it has a long string shape such as algae or a complicated shape in which fiber components are entangled. Can not be concentrated. Specifically, sludge supplied on a horizontally installed belt does not change its posture on the belt while being concentrated. Cannot be filtered with a belt.

In a general drum type concentrator having a cylindrical screen made of punching metal or the like having a large number of pores as in Patent Document 2, when the pore diameter is increased, the discharge resistance is reduced and the filtrate is easily discharged, but sludge is also generated. The recovery rate deteriorates because it falls out. If the pore size is made smaller, sludge will be less likely to come off and the recovery rate will be improved, but the discharge resistance will be greater and the filtrate will be less likely to come off. The sludge must be conditioned according to the hole diameter of the cylindrical screen, which makes the adjustment complicated.

Although the drum type concentrator that controls the operation by adjusting the rotation speed of the screw shaft and the outer cylinder screen as in Patent Document 3 can adjust the concentration of sludge by adjusting the storage time of sludge on the filtration surface. However, the filtrate collected around the pores of the outer cylinder screen cannot be removed, and the filtration performance deteriorates.

This invention combines a drum-type concentrator with a filter medium having a drainage action, controls the transport speed of the drum body and the traveling speed of the filter medium so as to cope with the fluctuation of the properties of the inflowing sewage sludge, and provides a concentrated sludge with a stable concentration. Provided is a method for operating a drum type concentrator to be produced.

The present invention is a drum for controlling the concentration of concentrated sludge to be discharged by running a drainage filter medium that is freely movable around a drum body that conveys sludge with a spiral provided inside while performing solid-liquid separation with a rotatable cylindrical filter body. In the operating method of the type concentrator, the standard sludge concentration of the thickened sludge with a certain width, the standard rotation speed of the drum body, the maximum rotation speed that is the maximum value of the reference rotation speed, and the minimum value of the reference rotation speed A certain minimum rotation speed, the number of rotations to be increased or decreased in stages, the reference running speed of the drainage filter medium, the maximum running speed that is the maximum value of the reference running speed, the minimum running speed that is the minimum value of the reference running speed, Set the traveling speed range to be increased or decreased, and measure the measured value of concentrated sludge concentration.If the measured value of concentrated sludge is within the range of standard sludge concentration, continue operating the drum type thickener. , is lower than the reference sludge enrichment measurement value of thickened sludge is preset, promote and allowed solid-liquid separation increases the residence time of the sludge in the drum body by Rukoto reduces the rotational speed of the drum body by the rotation speed width and repeats this operation until the measured value of the concentrated sludge is increased within the range of the reference sludge enrichment, when the rotational speed of the drum body is minimized rotational speed, the traveling speed of the drainage filter material only travel speed width increases the filtrate is stuck in the pores near the filtration body by Rukoto is to facilitate the action of draining is adsorbed into the drainage filter media side, this to the measurement value of thickened sludge is increased within the range of the reference sludge enrichment with repeated operation, it is higher than the reference sludge enrichment measurement value of thickened sludge is preset, solid to reduce the residence time of the sludge in the drum body by Rukoto increasing the rotational speed of the drum body by the rotation speed width This operation is repeated until the liquid separation is suppressed and the measured value of the concentrated sludge falls within the range of the standard sludge concentration.When the rotation speed of the drum reaches the maximum rotation speed, the running speed of the drainage filter medium is run. reducing the effect of drainage by adsorbing the filtrate are stuck in the pores near the filtration body by Rukoto is decreased by the speed width wastewater filtration media side, within the measurement value of the reference sludge enrichment of concentrated sludge By repeating this operation until it descends, it is possible to generate a stable concentrated sludge against fluctuations in sludge properties.

This invention combines a drum-type concentrator with a filter medium having a drainage action, and controls the running time of the sludge in the drum body and the running speed of the filter medium by spiral rotation control so as to cope with the fluctuation of the property of the inflowing sewage sludge. By adjusting the filtrate discharge efficiency by means of, it is possible to always generate concentrated sludge with a constant concentration.

1 is a schematic front view of a drum type concentrator according to the present invention. Similarly, it is a schematic longitudinal side view of a drum type concentrator. Similarly, it is a rear view of a drum type concentrator. It is a system diagram of the operating method of the drum type concentrator according to the present invention. Similarly, it is a flowchart of the operating method of the drum type concentrator.

FIG. 1 is a schematic front view of a drum type concentrator. A drum body 3 is formed by fixing a spiral 2 formed by spirally forming a flat plate to the inner peripheral surface of a cylindrical filter body 1. The filter body 1 is composed of a metal filter medium such as punching metal having a large number of pores, or a known filter cloth having a filtering function.

The drainage filter medium 4 is hung around the bottom of the drum body 3 and is slidably contacted with the drum body 3 to run. The drainage filter medium 4 has a belt shape and has a function of transmitting a liquid component. After coming into contact with the filtrate remaining on the cylindrical filter body 1 with surface tension and adsorbing it to the drainage filter medium 4 by the capillary phenomenon, it is drained from the lower surface. As the drainage filter medium 4, it is possible to use a well-known filter medium having a liquid content permeating function such as a coarse filter cloth or a net and not having a water retaining function.

A pair of return rolls 14, 14 and a drive roll 15 and a driven roll 16 are arranged above the drum body 3, and the drainage filter medium 4 is hung from the inside of the return roll 14 and the outside of the drive roll 15 and the driven roll 16. It is turned and stretched endlessly.
A cleaning device 21 for cleaning the drainage filter medium 4 is disposed between the drive roll 15 and the driven roll 16.

A pair of support rolls 18, 18 is arranged from the outside of the drain filter medium 4 at the sliding contact portion between the drum body 3 and the drain filter medium 4. The positions and the number of the support rolls 18 are appropriately set according to the diameter of the drum body 3, the amount of sludge supplied, and the like.

Below the drum body 3, there is arranged a filtrate receiver 6 for storing or delivering the filtrate that passes through the drainage filter medium 4 and drops.

FIG. 2 is a schematic vertical sectional view of the drum type concentrator. The front and rear ends of the filter body 1 are connected to the annular outer rings 7, 7 for reinforcement. The outer ring 7 has a predetermined width in the axial direction in order to secure a running allowance at both ends of the drainage filter medium 4.

The outer ring 7 at the front end is provided with a lid 8 so that the sludge inside does not leak. A sludge supply pipe 9 is inserted through the lid 8. The supply pipe 9 inserted from the lid 8 supplies the sludge to the vicinity of the outer ring 7 at the front end. The supply pipe 9 is connected to a supply device (not shown). Note that the lid 8 does not have to cover the entire outer ring 7, and may have a height such that the sludge inside does not overflow.

A sprocket is formed on the outer ring 7 at the front end, and is connected to the spiral driving machine 11 by a chain 10. The outer rings 7, 7 at the front and rear ends, the cylindrical filter body 1, and the spiral 2 are integrally rotatable. By the rotation of the spiral 2, the sludge supplied near the outer ring 7 at the front end is filtered by the filter body 1, while the concentrated sludge having a reduced liquid content is conveyed toward the outer ring 7 at the rear end.

The outer ring 7 at the rear end is open, and the concentrated sludge is discharged to the concentrated sludge receiver 12 arranged below the outer ring 7.
The concentrated sludge receiver 12 is provided with a densitometer 22 for measuring the concentration of the concentrated sludge.

A roll driving machine 17 is connected to the drive roll 15, and the endless drainage filter medium 4 is configured to run by rotating the drive roll 15.

FIG. 3 is a rear view of the drum type concentrator. Since the sludge supply pipe 9 is inserted through the opening 13 provided in the central portion of the lid 8, even if the lid 8 rotates integrally with the drum body 3, the supply pipe 9 is stably fixed in the drum body 3. The sludge can be supplied inside.

In the embodiment, the drum body 3 is rotatably driven by the chain 10, but a known joint such as a pulley or a gear can be used.

It should be noted that members that support the constituent requirements of the present device, such as a frame, bearings, ribs, etc., are appropriately arranged according to specifications and conditions.

The sludge in the filter body 1 is transported from the bottom to a height near the central axis along the rotation of the drum body 3, and then sludges to the bottom by its own weight. At this time, the liquid content inside the sludge is extracted on the surface by the action of mashing the sludge, and the solid-liquid separation by the filter body 1 is promoted. Due to the rotating action of the spiral spiral 2, the sludge inside is conveyed to the discharge side, and during that time, the sludge is subjected to the kneading action and further concentrated. The pitch of the spiral 2, the height of the flat plate, and the like are appropriately set according to the supply amount and the like so that the sludge to be conveyed does not overflow into the adjacent stage.

The cylindrical filter body 1 has a large number of pores. Although the opening ratio, pore size, etc. are determined according to the sludge to be supplied, it is necessary to set the pore size small in order to increase the sludge recovery rate.
When the pore size is small, when a large amount of the filtrate is discharged, it is dripped from the pores by its own weight, but when the filtrate is small, the surface tension causes the filtrate to stick to the inside of the pores or the outer peripheral surface of the filter body 1 to form the filtrate. Do not drip.

Therefore, the drainage filter medium 4 is brought into sliding contact with the filtrate adhered to the filter body 1 due to the surface tension so as to be separated from the filter body 1. The drainage filter medium 4 has a function of absorbing the filtrate by utilizing the capillary phenomenon, and when the drainage filter medium 4 comes into contact with the filtrate of the filter body 1, the filtrate is adsorbed by the drainage filter medium 4. At the same time, the drainage filter material 4 has an excellent drainage function, has a large opening ratio, does not have a water retention function inside, and has a structure in which the filtrate is easily dropped by its own weight.

Specifically, by configuring the drainage filter medium 4 with a filter cloth, a net, or the like having a large opening ratio and a material having hydrophilicity, the above-described effects can be obtained.

In the filter body 1 that is in sliding contact with the drainage filter medium 4, since the filtrate that has been stuck in the vicinity of the pores is adsorbed on the drainage filter medium 4 side, the discharge resistance is reduced, and at the same time, the filtration from the sludge is caused by the capillary action of the pores. The liquid can be absorbed easily and the processing capacity is improved. Further, even if the pore size of the pores is reduced, the drainage capacity does not decrease, so sludge removal inside the drum body 3 is reduced, and the sludge recovery rate is improved.

The position at which the drainage filter medium 4 is brought into sliding contact with the filter body 1 may be a position at which the filtrate is discharged from the filter body 1, and the interval between the return rolls 14 may be varied depending on the sludge property, the supply amount, the tension, and the like. , The height is appropriately set, and the winding angle of the drainage filter medium 4 is adjusted.

In this embodiment, a ribbon-shaped hollow spiral is fixed to the inner peripheral surface of the filter body 1. However, other forms of concentration in which the spiral spiral is rotated in the tubular filter body to convey the sludge. It can also be applied to machines.

In addition, in this embodiment, the drainage filter medium 4 is slidably contacted with the filter body 1. However, by using a water absorbing filter medium composed of a sponge that absorbs the filtrate from the filter body 1 inside, a separate water absorbing filter medium is used. The filtrate may be collected.

FIG. 4 is a system diagram of the operating method of the drum type concentrator. The concentrated sludge discharged from the drum type concentrator is temporarily stored in the concentrated sludge receiver 12. The concentration of the concentrated sludge in the concentrated sludge receiver 12 is measured by a densitometer 22, and a detection signal is transmitted to the control device 23. The control device 23 compares and determines the detection signal transmitted from the densitometer 22 and transmits a command to the spiral driving machine 11 or the roll driving machine 17.

When the operation of the drum type thickener is started, the concentration of the thickened sludge is measured by the densitometer 22 in real time and sent to the controller 23 .

Generally, when the property of the inflow sludge changes and the solid content of the treated sludge increases (decreases), the concentration of concentrated sludge discharged from the drum type concentrator increases (decreases).

Therefore, the control device 23 of the present invention, in comparison determines that the reference sludge enrichment degree X0 set the measured value X of the concentration meter 22 in advance, when the measurement value X is out of the reference sludge enrichment degree X0, spiral A command is given to the driving machine 11 or the roll driving machine 17 to increase or decrease the concentration of the concentrated sludge discharged from the drum type concentrator. By adjusting the discharge efficiency of the dwell time or filtrate, it is possible to easily maintain the enrichment of the concentrated sludge to the reference sludge enrichment degree X0.
Reference sludge enrichment degree X0 can be set to have a certain width, when the measured value X of enrichment is within the setting range continues the normal operation while maintaining the status quo.

In more detail, when the measured value X of the concentrated sludge is lower than the reference sludge enrichment degree X0, the control unit 23 gives an instruction to the spiral drive motor 11 to reduce the rotational speed of the spiral. By increasing the residence time in the drum body 3, solid-liquid separation of sludge is promoted, and the concentration of sludge can be increased. Further, the measurement value X also concentrated sludge to reduce the rotational speed of the spiral drive motor 11 if not return to the reference sludge enrichment degree X0, provides an instruction from the controller 23 to the roll drive motor 17, drainage filter medium 4 Increase running speed. The drainage efficiency of the filter body 1 can be increased by adsorbing and draining the filtrate, which is attached around the pores of the filter body 1, to the drain filter medium 4 side by the capillary phenomenon.

On the other hand, when the measured value X of the concentrated sludge is higher than the reference sludge enrichment degree X0, the control unit 23 gives an instruction to the spiral drive motor 11 to increase the rotational speed of the spiral. Since the residence time in the drum body 3 is reduced, the sludge is transported in a state where solid-liquid separation is not promoted, and the sludge concentration can be lowered. Further, the measurement value X also concentrated sludge by increasing the rotational speed of the spiral drive motor 11 if not return to the reference sludge enrichment degree X0, provides an instruction from the controller 23 to the roll drive motor 17, drainage filter medium 4 Reduce running speed. The drainage efficiency of the filter body 1 can be lowered by reducing the action of adsorbing and draining the filtrate adhering around the pores of the filter body 1 to the drainage filter medium 4 side.

Once changing the rotational speed of the spiral drive motor 11 or roll drive motor 17, again measured enrichment after a predetermined time has elapsed, the above operation is repeated until the measured value X is returned to the reference sludge enrichment degree in X0.

FIG. 5 is a flowchart of the driving method according to this embodiment.
A. The standard sludge enrichment X0 (maximum standard sludge enrichment Xmax, minimum standard sludge enrichment Xmin) is set according to the treatment equipment at the latter stage of initial setting. In the present embodiment, the range between the maximum standard sludge enrichment Xmax and the minimum standard sludge enrichment Xmin is defined as the standard sludge enrichment X0.
Further, the reference rotational speed N0 (maximum rotational speed Nmax, minimum rotational speed Nmin) of the drum body 3 and the rotational speed width n to be increased/decreased gradually, and the reference traveling speed S0 of the drainage filter medium 4 (maximum traveling speed Smax, minimum traveling speed). Smin) and the traveling speed width s to be increased/decreased stepwise are set.
Further, the measurement interval of the densitometer 22 is set.

B. Start of operation Each device is operated at the above-mentioned reference values N0 and S0, and the stock solution is supplied to the drum body 3 .

C. Sludge concentration comparison The concentration of the concentrated sludge discharged from the drum 3 is measured and compared with the reference sludge concentration X0.
When the measured value X of the concentration is within the standard sludge concentration X0, the operation of each device is maintained in the current state.
When the measured value X is lower than the standard sludge concentration X0, the process proceeds to D in the flowchart, and control is performed to gradually reduce the rotation speed of the drum body 3 .
When the measured value X is higher than the standard sludge enrichment X0, the process proceeds to E in the flowchart, and control is performed to increase the rotation speed of the drum body 3 stepwise.

D. Rotational Speed Comparison of Drums In the above flow chart C, when the measured value X of the concentration of the concentrated sludge is lower than the reference sludge concentration X0, the transfer speed of the spiral 2 is decreased stepwise to increase the concentration. The rotation speed N in consideration of the rotation speed width n of the drum body 3 to be decreased to the minimum rotation speed Nmin is compared.
When the changed rotation speed N is higher than the minimum rotation speed Nmin, the process proceeds to F in the flowchart, and control is performed to gradually decrease the rotation speed of the drum body 3.
When the changed rotation speed N is equal to or lower than the minimum rotation speed Nmin, the process proceeds to G in the flowchart, and control is performed to increase the traveling speed of the drainage filter medium 4 stepwise.

F. Rotational speed of drum (reduction)
In the above flowchart D, when the changed rotation speed N of the drum body 3 is higher than the minimum rotation speed Nmin, control is performed to reduce the rotation speed by a preset rotation speed width n.
Specifically, the spiral driving machine 11 is adjusted to reduce the rotational speed of the drum body 3 by a preset rotational speed width n.

G. Comparison of Running Speed of Drainage Filter Media In the above-mentioned flowchart D, when the rotation speed N of the drum body 3 is equal to or lower than the minimum rotation speed Nmin, the running speed of the drainage filter media 4 is increased in order to increase the discharge efficiency of the filtrate. The traveling speed S in consideration of the traveling speed width s that is increased stepwise is compared with the maximum traveling speed Smax.
When the traveling speed S of the drainage filter medium 4 after the change is smaller than the maximum traveling speed Smax, the process proceeds to H in the flowchart, and control is performed to increase the traveling speed of the drainage filter medium 4 in steps.
When the traveling speed S of the drainage filter medium 4 after the change becomes equal to or higher than the maximum traveling speed Smax, the process proceeds to I in the flowchart to issue an alarm or control to automatically stop the operation of the concentrator.

H. Running speed of drainage filter media (increase)
In the above-mentioned flowchart G, when the traveling speed S of the drainage filter medium 4 after the change is smaller than the maximum traveling speed Smax, the roll driving machine 17 is adjusted to increase the traveling speed of the drainage filter medium 4 by a preset traveling speed width s. Take control.

I. After the alarm/operation stop fixed time has elapsed, the concentration is measured again, and the above operation is repeated until the measured value X returns to within the standard sludge concentration X0. If the measured value of the concentration does not return to the reference value even when the traveling speed S of the drainage filter medium 4 reaches the maximum traveling speed Smax or the minimum traveling speed Smin, an alarm is issued or the operation of the concentrator is automatically stopped. ..

E. Rotational Speed Comparison of Drums In the above flow chart C, when the measured value X of the concentration of the concentrated sludge is higher than the reference sludge concentration X0, it is stepwise to increase the transport speed of the spiral 2 in order to decrease the concentration. The maximum rotation speed Nmax is compared with the rotation speed N in consideration of the rotation speed width n of the drum body 3 that is increased.
If the changed rotation speed N is smaller than the maximum rotation speed Nmax, the process proceeds to J in the flowchart, and control is performed to increase the rotation speed of the drum body 3 stepwise.
When the changed rotation speed N is equal to or higher than the maximum rotation speed Nmax, the flow shifts to K in the flowchart, and control is performed to gradually reduce the traveling speed of the drainage filter medium 4.

J. Rotational speed of drum (increase)
In the above-mentioned flowchart E, when the changed rotation speed N of the drum body 3 is smaller than the maximum rotation speed Nmax, control is performed to increase the rotation speed by a preset rotation speed width n.
Specifically, the spiral driving machine 11 is adjusted to increase the rotational speed of the drum body 3 by a preset rotational speed width n.

K. Comparison of Running Speed of Drainage Filter Material In the above flow chart E, when the rotation speed N of the drum body 3 is equal to or higher than the maximum rotation speed Nmax, the running speed of the drainage filter material 4 is reduced in order to reduce the discharge efficiency of the filtrate. The traveling speed S in consideration of the traveling speed width s that is gradually reduced and the minimum traveling speed Smin are compared.
When the traveling speed S of the drainage filter medium 4 after the change is higher than the minimum traveling speed Smin, the process proceeds to L in the flowchart to perform control to gradually reduce the traveling speed of the drainage filter medium 4.
When the traveling speed S of the drainage filter medium 4 after the change becomes equal to or less than the minimum traveling speed Smin, the process moves to I in the flowchart to issue an alarm or control to automatically stop the operation of the concentrator.

L. Drainage filter running speed (reduction)
In the above flowchart K, when the changed traveling speed S of the drainage filter medium 4 is larger than the minimum traveling speed Smin, the roll driving machine 17 is adjusted to reduce the traveling speed of the drainage filter medium 4 by a preset traveling speed width s. Take control.

When the rotation speed of the drum body 3 or the traveling speed of the drainage filter medium 4 is changed, the measurement value X of the concentration is measured again after a certain period of time, and the above operation is repeated until the measurement value X returns to the standard sludge concentration X0. repeat.

In the method for operating a drum type concentrator according to the present invention, in order to control the concentration of sludge, not only the storage time in the drum body but also the discharge efficiency from the periphery of the pores of the drum body can be adjusted by the traveling speed of the filter medium. .. Therefore, the sewage sludge whose properties of the treated stock solution fluctuates momentarily depending on the season, weather, etc. can be discharged at a constant concentration at all times, which stabilizes the subsequent dehydration treatment, digestion treatment, drying treatment, etc., and improves overall manageability. Is.

1 Filter body 2 Spiral 3 Drum body 4 Drainage filter material X0 Standard sludge concentration Xmax Maximum standard sludge concentration Xmin Minimum standard sludge concentration N0 Standard rotation speed Nmax Maximum rotation speed Nmin Minimum rotation speed n Rotation speed width S0 Reference running speed Smax Maximum Running speed Smin Minimum running speed s Running speed range

Claims (1)

Concentrate by rotating the drainage filter medium (4) around the drum body (3) that conveys sludge by the spiral (2) installed inside while separating solid-liquid by the rotatable cylindrical filter body (1) and discharging. In the operation method of the drum type concentrator that controls the concentration of sludge,
The standard sludge enrichment (X0) of the concentrated sludge that has a width in advance,
The reference rotation speed (N0) of the drum body (3), the maximum rotation speed (Nmax) that is the maximum value of the reference rotation speed (N0), the minimum rotation speed (Nmin) that is the minimum value of the reference rotation speed (N0), Rotation speed width (n) to be increased or decreased in stages,
The reference traveling speed (S0) of the drainage filter medium (4), the maximum traveling speed (Smax) that is the maximum value of the reference traveling speed (S0), the minimum traveling speed (Smin) that is the minimum value of the reference traveling speed (S0), A traveling speed range (s) that is increased or decreased in stages,
And set
Measure the measured value (X) of the concentration of concentrated sludge,
When the measured value (X) of the thickened sludge is within the range of the standard sludge enrichment (X0), the operation of the drum type thickener is continued,
If the measured value of the concentrated sludge (X) is lower than the reference sludge enrichment (X0) which is set in advance, by Rukoto reduces the rotational speed of the drum body (3) by the rotation speed width (n) at the drum body (3) Increase the retention time of sludge and promote solid-liquid separation,
Repeat this operation until the measured value (X) of concentrated sludge rises within the range of standard sludge concentration (X0),
When the rotational speed of the drum body (3) is the smallest rotational speed (Nmin), the pore of the filtration body (1) by Rukoto increasing the running speed of the drainage filter media (4) only speed width (s) The filtrate adhering to the periphery is adsorbed on the drain filter medium (4) side to promote the action of draining,
Repeat this operation until the measured value (X) of the concentrated sludge rises within the range of the standard sludge concentration (X0),
If the measured value of the concentrated sludge (X) is higher than the reference sludge enrichment previously set (X0), the Rukoto increasing the rotational speed of the drum body (3) by the rotation speed width (n) at the drum body (3) The sludge retention time is reduced to suppress solid-liquid separation,
Repeat this operation until the measured value (X) of the concentrated sludge falls within the range of the standard sludge concentration (X0),
When the rotational speed of the drum body (3) becomes the maximum rotation speed (Nmax), the pores of the running speed of the running speed width of the drain filter medium (4) (s) by filtration body by Rukoto reduced (1) The action of adsorbing the filtrate adhering to the periphery to the drain filter medium (4) side and reducing the drainage is reduced,
A method for operating a drum type concentrator, wherein this operation is repeated until the measured value (X) of the concentrated sludge falls within the range of the standard sludge concentration (X0).

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