JP2022089515A - Dehydration treatment method and dehydration facility for wastewater treatment sludge - Google Patents

Abstract

To provide a dehydration treatment method and dehydration facility for wastewater treatment sludge capable of being stably operated even when the concentration of coagulated sludge is not supplied at a high level.SOLUTION: A dehydrating process for dehydrating wastewater treatment sludge includes a sludge supply process, a settling process for settling the supplied sludge, a filtration process for filtering the sludge obtained by the settling process, a pressing process for squeezing the sludge obtained by the filtering process, and a slag removing process for removing the sludge left by the pressing process, where the mud supplying and settling processes and the pressing and slag removing processes proceed simultaneously.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wastewater treatment sludge dehydration treatment method and a dehydration facility for dehydrating sludge during wastewater treatment.

Conventionally, slurry-like coagulated sludge (hereinafter referred to as "coagulated sludge") generated in wastewater treatment equipment has been treated by operating two types of dehydrators, a decanter type dehydrator and a press type dehydrator. ..

The decanter type dehydrator is a method in which a coagulation aid and coagulated sludge are mixed, introduced into a decanter, and dehydrated by centrifugation, and dewatered sludge having a relatively high water content is produced.

On the other hand, the press type dewatering machine is a type of dewatering machine that presses a filter cloth (filter cloth) and does not use a coagulation aid, and produces plate-shaped dewatered sludge having a water content lower than that of the decanter type. ..

Therefore, we would like to continue to operate the press-type dehydrator, which has a low water content and does not use coagulation aid chemicals, in the wastewater treatment equipment, but it is significantly susceptible to the properties (especially concentration) of coagulated sludge. It was difficult to operate the sludge unless it was stably supplied with a high concentration of coagulated sludge.

There are prior arts of Patent Documents 1 to 5 regarding the treatment of coagulated sludge in wastewater treatment.

The wastewater clarification method described in Patent Document 1 uses two or more clarifiers to perform at least two alternating and identical treatment cycles, and each treatment cycle is a supply period accompanied by simultaneous supply and discharge. It consists of a reset period in which excess sludge is removed to the thickener and the remaining sludge bracket is homogenized and pre-settled. In Patent Document 1, the supply step and the discharge step are performed at the same time, but the settling step is not performed at the same time, so that the properties of the coagulated sludge cannot be improved.

Patent Document 2 is a filtration and concentrating device that reduces the volume of the storage tank by discharging the filtrate in the storage tank with a liquid pump while the air pump is operating. This Patent Document 2 describes that the air pump filtration (filtration) step and the unconcentrated sludge discharge step are performed at the same time, but in the air pump filtration step, the air in the storage tank is sucked by the air pump. This is the process of filtering sludge, not the process of pressing the filter cloth.

Patent Document 3 describes "a step of sucking from an existing sewage treatment tank (A) to a small sewage treatment device (1), and on the other hand, an existing sewage treatment device (1) from a small sewage treatment device (1) by a discharge means. It is a mobile small sewage treatment device that can be mounted on a vehicle, but there is no description about the settling process.

Patent Document 4 uses the first filtration device (102) to increase the concentration of raw water (105) in the raw water tank (101). ... The raw water (105) is filtered using the second filtration device (121). The second filtration device (121) is a solid matter recovery method in which the filtrate is filtered through a coarse filter and the filtrate is returned to the raw water tank (101). It is described that "the first filtration device and the filter device (second filtration device) are operated at the same time." Here, the filter device is one in which the fluid is concentrated by a filter device having a self-forming film made of an object to be removed, but is different from the one in which the fluid is concentrated by sedimentation.

None of the techniques of Patent Documents 2 to 4 propose improvement of the properties of the settled sludge.

Patent Document 5 describes a concentration step of adding a flocculant to an ash slurry that has undergone a washing step to precipitate and separate it, a first dehydration step of dehydrating the concentrated slurry, and a dewatered cake dispersed with water and containing carbon dioxide. A treatment method including a highly dehydrated step of adding gas and heating and a second dehydrating step of dehydrating the highly dehydrated slurry with a filter press to obtain a dewatered ash cake is described.

In the technique of Patent Document 5, there is a concentration step of sedimentation, but the sedimentation is carried out by adding a flocculant. Although a press-type dewatering process is adopted, a coagulant is used to supply a high concentration of coagulated sludge, and it was not a dewatering device that can ensure stable operation.

Therefore, conventionally, in the operation of the press type dehydrator, stable operation could not be performed without being affected by the properties of the slurry-like coagulated sediment sludge.

Japanese Patent Publication No. 2017-516658 Japanese Unexamined Patent Publication No. 2008-6360 Japanese Patent Application Laid-Open No. 2003-190995 JP-A-2002-166297 Japanese Patent No. 6252653

In view of such circumstances, the present invention provides a wastewater treatment sludge dewatering treatment method and a dewatering facility capable of short cycle time and stable operation even if a high coagulation sludge concentration is not supplied.

The premise of the invention of the present invention will be described.
According to the inventor's knowledge, a decanter type dehydrator is used to dehydrate coagulated sludge in wastewater treatment equipment such as thermal power plants, and it produces dehydrated sludge with a relatively high water content of 82%. rice field.

After that, a press-type dehydrator was introduced to produce plate-shaped sludge having a water content of 77%, which was a type that did not use a flocculant.

We would like to continue to operate a press-type dehydrator with a high water content and no coagulant (chemical), but as mentioned above, it is significantly affected by the properties (especially concentration) of coagulated sludge and is stable. It was difficult to operate unless the concentration of coagulated sludge was high.

In the take-back test, the concentration of coagulated sludge was concentrated over time at 3.0 wt%. At present, the concentration of coagulated sludge has remained below 2 wt% on average annually, which has a significant impact on operation, and as a result, the decanter type dehydrator had to be operated mainly (the situation was such that the decanter type dehydrator had to be operated mainly. The concentration of coagulated sludge is usually around 1.5 wt%, and if it is 2 wt% or less, poorly dehydrated sludge will occur).

The concentration always fluctuates depending on the treatment amount of the air heater (AH), gas gas heater (GGH), washing wastewater, etc. of the boiler exhaust smoke and the operation time of the wastewater treatment.

Therefore, the inventor has a sludge supply means for supplying sludge, a settling means for performing a settling step on the supplied sludge, and a settling means in a wastewater treatment facility so that the press type dehydrator can be operated stably. Control parameters of a filtering means for performing a filtering step on sludge obtained from, a squeezing means for performing a squeezing step for sludge obtained from the filtering means, and a sewage removing means for removing sludge remaining in the squeezing means. And considered diligently.

As a result, the control parameters were changed and the process order was changed so that the press type dehydrator could be operated stably. The main content was to improve the sludge collection rate by using a filter cloth by extending the filtration time for low coagulation sludge concentration.

Next, in the pre-stage device supplied by the dehydrator, the sludge slurry was concentrated by extending the settling time in order to secure the concentration time of the sludge slurry in the sludge storage tank.

Since the time for each process increases due to the change of parameters, it was devised that the mud supply process and the sedimentation process are performed simultaneously during the squeezing process and the slag removal process.

That is, the present invention is a method for dehydrating wastewater treatment sludge, which comprises a sludge supply step for supplying sludge.
A settling step for settling the supplied sludge, a filtering step for filtering sludge obtained from the settling means, a squeezing step for squeezing the sludge obtained from the filtering means, and removing sludge remaining in the squeezing means. It is a method for dehydrating sludge from wastewater treatment, which has a sewage sludge removal step and simultaneously proceeds with a mud supply step and a sedimentation step and a squeezing step and a sewage removal step.

In the present invention, it is preferable to carry out the squeezing step with a press-type dehydrator.

In the present invention, one cycle proceeds with the mud feeding step, the settling step, and the filtering step, and then the squeezing step and the slag removal step, and the squeezing step and the slag removal step in the previous one cycle proceed. At this time, it is preferable that the mud feeding step and the settling step in the next one cycle proceed at the same time.
In the present invention, when the dehydration treatment method is initially started from the stopped state, the process sequence of the first round proceeds in the order of the mud feeding step, the settling step, the filtering step, the squeezing step, and the slag removal step, and the second round is supplied. It is preferable that the mud step and the settling step proceed at the same time as the squeezing step and the slag removal step.

The present invention is a sludge dehydration facility for wastewater treatment sludge, which is a sludge supply means for supplying sludge, a settling means for performing a settling step on the supplied sludge, and a filtering step for sludge obtained from the settling means. It has a filtering means for performing sludge, a squeezing means for performing a sludge pressing step obtained from the filtering means, and a sludge removing means for removing sludge remaining in the squeezing means. It is a wastewater treatment sludge dehydration facility characterized by simultaneously proceeding with the sewage removal process.

According to the wastewater treatment sludge dehydration treatment method and the dehydration equipment of the present invention, the mud supply step and the sedimentation step and the squeezing step and the sewage removal step proceed at the same time, so that the cycle is performed even if the coagulated sludge concentration is not high. It can exert an excellent effect that dehydrated sludge can be produced stably in a short time.

It is explanatory drawing of the dehydration equipment which performs the dehydration treatment method of the wastewater treatment sludge which concerns on embodiment of this invention. It is a process explanatory drawing before parameter change which explains the premise of the wastewater treatment process of a dehydration facility. It is a process explanatory diagram after parameter change explaining the premise of the wastewater treatment process of a dehydration equipment. It is a process explanatory diagram after program change explaining the wastewater treatment process of a dehydration equipment, (a) is an explanatory diagram of a process cycle flow, and (b) is an explanatory diagram of a time flow.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of an overall configuration of a dewatering facility that performs a dewatering treatment method for wastewater treatment sludge according to an embodiment.

As shown in FIG. 1, an embodiment is a sludge dewatering facility for sludge treatment, and is a sludge supply means 10 for performing a sludge supply step of feeding a sludge containing sludge in wastewater toward a settling means, and a sludge feeding means. A sludge storage tank (settling means) 12 that performs a settling step to settle and separate flocs from the slurry, and sludge containing flocs that have been settled and separated in the sludge storage tank 12 are introduced into a filter cloth 14a and a filtering step is performed by the filter cloth 14a. A press-type dehydrator 14 that performs a pressing step of squeezing and dehydrating sludge whose water content has been lowered by filtration, and a de-sludge step of removing sludge generated by dehydration from the press-type dehydrator 14. It is a wastewater treatment sludge dehydration facility that has a sludge removal means 16 and simultaneously proceeds with the sludge supply step and the sedimentation step, and the squeezing step and the sewage removal step.

In the embodiment, in the wastewater treatment in a thermal power plant, the dehydration treatment method is carried out by a facility for dehydrating sludge from the slurry-like wastewater.
In FIG. 1, the description of the mud supply process is shown by circled numbers 1 to 5.

[Mud supply process]
The mud supply means 10 directs slurry-like sludge from the bottom of the concentration tank 18 toward the sludge storage tank 12 and the pipeline 20 and the mud supply pump 22 (A) as shown by the dashed line indicated by the circled number “1”. , B) has a configuration of sending out (sludge supply process).

The concentrating tank 18 is for standing and concentrating the wastewater containing sludge to be treated in the facility. The drainage from the drainage pit 24 in the center is sent to the concentration tank 18 by a pump 24p. A return pipeline from the mud supply pumps 22 (A, B) to the concentration tank 18 is also provided.

The sludge storage tank 12 is a facility for sedimenting and separating flocs in the slurry.

Here, in the dehydration equipment according to the embodiment, for example, the No. 1 non-recovery drainage storage tank 26 for accommodating the air heater (AH) drainage of the boiler, the pH adjustment oxidation tank 28, the caustic soda storage tank 30, and the coagulation aid. An agent dissolving tank 32 is provided. Wastewater is supplied to the pH-adjusted oxidation tank 28 from the No. 1 non-recovery wastewater storage tank 26 by the pump 26a, and air is supplied by the air pump 28a to dissipate the wastewater in the pH-adjusted oxidation tank 28. Infused. Further, the caustic soda is supplied from the caustic soda storage tank 30 to the pH adjustment oxidation tank 28 by the pumps 30a (A, B), and the coagulation aid is supplied from the coagulation aid dissolution tank 32 by the pump 32a.

The functions of each part will be explained.
The pH-adjusted oxidation tank 28 neutralizes and aggregates by air dispersal, oxidizes iron ions in the wastewater, and flocs the suspended solids (SS) in the wastewater. At the outlet, a polymer coagulation aid (polymer) is added to grow flocs and coagulate (coagulation liquid).

[Settling process]
In the sludge storage tank 12, the flocs are settled and separated (sedimentation step). In this case, a coagulated liquid containing flocs made in the pH-adjusted oxidation tank 28 is flowed in from the center of the sludge storage tank 12, and the raw water is uniformly inflowed and dispersed by a feed well installed in the sludge storage tank 12. The treated water overflows from the upper V-notch type trough, and the settled sludge (flock) is collected in the center by a center-driven rake 12a (rotated by the motor M). In the settling step, sludge is settled and separated toward the bottom of the sludge storage tank 12 as shown by the path indicated by the circled number “2”.

[Filtration process]
In the filtration step, the sludge that has settled and collected is passed through the sludge pipe 38 from the bottom of the sludge storage tank 12 to the sludge pump 38a (A, B) as shown by the dashed line indicated by the circled number “3”. Is pumped to the filter cloth of the press type dehydrator 14. When the sludge is pumped, the filter cloth 14a of the press-type dehydrator 14 filters the sludge (filtration step), and the filtered sludge cake remains on the filter cloth, while the filtrate flows through the filtrate pipe 40 in the sludge storage tank. It is returned to 12.

In FIG. 1, 14A outlines a front view state and 14S outlines a side view state of the press type dehydrator 14. The mud drain pipe 38 and the filtrate pipe 40 are connected to the front view state 14A.

[Squeezing process]
As shown in the side view state 14S, the press type dehydrator 14 applies pressure to the filter portion by the press cylinder 14b to dehydrate the sludge stored in the sludge storage tank 12 (squeezing step). The filtrate squeezed out in the squeezing step is charged into the feed well of the sludge storage tank 12 from the press-type dehydrator 14 through the filtrate pipe 40 as shown by the two-dot chain line path indicated by the circled number "4". To.

Here, as the press type dehydrator 14 that performs the filtration step, the squeezing step, and the slag removal step, the filter press type dehydrator is adopted in the embodiment. Specifically, a filter cloth traveling type fully automatic pressing type filter press is adopted. As the slag removal means 16, the filter chamber was opened and closed, and the filter cloth was run at the same time to peel off the cake. Filter cloth cleaning is performed in units of multiple rooms. Filter cloth washing It is possible to effectively wash the filter cloth by applying water pressure.

As the press type dehydrator, if it has a filter press type pressure filtration function, a dehydrator other than the filter running type can be adopted. The filter press type dehydrator applies filtration pressure (differential pressure between the primary side and the secondary side) by pressurizing the sealed primary side of filtration with a filtration pump to exert the filtration function and form a cake layer. Any form of proceeding with the filtration process and then squeezing the sludge from the filter cloth with a diaphragm or high pressure air can be adopted.

[Slag removal process]
The press-type dehydrator 14 removes sludge, which has been dehydrated by the slag removal means 16 and has become a cake, from the filter cloth (slag removal step). In the slag removal step, the squeezed sludge cake is discharged to the cake hopper 36 as shown by the dashed line indicated by the circled number “5”.

The cake hopper 36 is installed in the lower part of the press-type dehydrator 14, and stores the dehydrated sludge (cake) removed by the slag removal means 16.

In FIG. 1, reference numeral 42 indicates an in-house water pipe, 44 indicates a filtered washing water tank for storing in-house water for filtering and washing water, v indicates a valve, the enclosing character M indicates a drive motor, and c indicates a compressor.

Washing water is flowed from the in-house water pipe 42 to the mud drain pipe 38 and the washing machine of the press type dehydrator. In addition, air pressure is introduced from the compressor c into the filter chamber for cake peeling.

[Sludge treatment control parameters]
The control parameters of each process are considered so that the press type dehydrator 14 can be operated stably. Initially, it was considered that the control parameters proceeded in series, but as a result of the examination, the control parameters were changed (extension of process time, etc.) and the order was changed. In this case, the serial progress of each step is to proceed the next whole process cycle after completing one cycle of all steps, and the other steps do not overlap and progress within the same time.

FIG. 2 shows each process before changing the control parameters.

Before changing the control parameters, as shown in FIG. 2, each process is sequentially performed in the mud supply process: 12 minutes, the sedimentation process: 5 minutes, the filtration process: 10 minutes, the squeezing process: 10 minutes, and the slag removal process: 8 minutes. It has progressed.

FIG. 3 shows each process after changing the control parameters.

The main change was to extend the filtration time (1.5 times) in the filtration process for low coagulation sludge concentration to improve the sludge collection rate by filter cloth. Next, the sludge slurry was concentrated by extending the settling time (three times) in order to secure the sludge slurry concentration time in the sludge storage tank 12, which is the front end device for supplying the press type dehydrator 14.

After changing the control parameters, as shown in FIG. 3, mud feeding process: 12 minutes (no change), sedimentation process: 16 minutes (11 minutes increase), filtration process: 15 minutes (5 minutes increase), squeezing process: 17 minutes (5 minutes increase) and slag removal step: 11 minutes (3 minutes increase) were sequentially carried out. The total process time was 71 minutes. It increased by 26 minutes compared to before the change in FIG.

By changing the process time, stable operation of the press type dehydrator was possible, but the time of each process increased due to the change of parameters, but the total process time increased (26 minutes increase in the case of Fig. 3). Therefore, the amount of sludge treated has decreased. Therefore, it became necessary to operate the decanter type dehydrator to secure the processing amount.

Therefore, in the embodiment, the time of each step is increased as compared with FIG. 2 due to the parameter change, but the processing program is changed and the mud supply step (12 minutes) is shown as shown in FIG. 4 (a). And the sedimentation step (16 minutes) was changed to be carried out simultaneously during the 28 minutes of the squeezing step (17 minutes) and the slag removal step (11 minutes).

Then, after proceeding with the mud supply step, the settling step, and the filtration step, the time of one cycle of proceeding with the squeezing step and the squeezing step is set to be almost unchanged (71 minutes), and the squeezing step and the squeezing step in one cycle are set. At the same time, the mud feeding step and the settling step in the next one cycle are advanced.

As shown in FIG. 4B, the total process cycle time of the embodiment was 43 minutes (15 minutes + 12 minutes + 16 minutes). Compared with the process of FIG. 3, the time was shortened by 28 minutes, and stable dehydrated sludge could be produced.

Further, when the dehydration facility is initially started (initially started) from the master stopped state, the process sequence of the first round is as follows in the process order of FIG. It proceeds in the order of the scavenging step, and from the second round, as shown in the process order shown in FIG. 4, the mud feeding step and the settling step are progressing, and at the same time, the squeezing step and the scavenging step are simultaneously advanced.

According to the wastewater treatment sludge dewatering equipment of the embodiment, sludge can be efficiently generated by changing the parameters of the press type dewatering machine. The sludge dehydrated by each dehydrator is stored in the cake hopper and then carried out to the ash disposal site by consignment work. In the press type dehydrator, the cake hopper is loaded directly onto the truck after pressing, but in the case of the decanter type dehydrator, there are operating conditions such as paying out with a screw conveyor and cleaning the sludge carry-out part, so the water content is different, but the amount is almost the same. There is a difference in the carry-out time depending on the amount of sludge discharged. Also, unlike the press type dehydrator, the decanter type dehydrator requires a coagulation aid. Based on this, by operating with a press-type dehydrator, it has become possible to reduce the commission cost and the amount of chemicals used in the decanter-type dehydrator.

[Effect (1) Increase in sales or reduction in expenses / ratio]
Here, since it is possible to minimize the operation of the decanter type dehydrator by changing the parameters of the press type dehydrator, in order to confirm the effect, only the decanter type dehydrator is operated and only the press type dehydrator is operated. We compared and verified the operation of.

Reduction of chemical costs 1. Amount of chemicals used when 10 tons of dehydrated sludge is generated by a decanter type dehydrator
41.7h * 1.5m ³ / h / 1000 = 62.5kg
However, the time to generate 10 tons of dewatered sludge from the decanter type dehydrator: 41.7 hours The amount of dissolved coagulation aid (concentration 0.1%) used to operate the decanter type dehydrator: 1.5 m ³ / h

2. 2. Chemical costs for producing 10 tons of dewatered sludge with a decanter type dehydrator
62.5kg * 1,382 yen = 86,375 yen However, the cost per 1kg of coagulation aid: 1,382 yen / kg

3. 3. Annual chemical costs for sludge produced by a press dewatering machine to be produced by a decanter dewatering machine
86,375 yen * 1190/10 = 10,278,625 yen However, the annual amount of dewatered sludge generated by the press-type dewatering machine: (365 days-7 days) / 3 days * 10t ≒ 1190t
Number of days required to generate 10 tons of dewatered sludge from a press-type dehydrator: 3 days

Maintenance days for the press-type dehydrator: 7 days / year Therefore, the chemical cost was reduced by 10,278,625 yen / year.

[Effect (2) Personnel x time reduction]
The number of workers involved in sludge removal is 3 people The number of days until 10t of cake hopper of the press type dehydrator is deposited is 3 days The number of days related to the maintenance of the press type dehydrator is 7 days / year, so 3 workers are 119 We carry out sludge once / year.

1. 1. Press-type dewatering machine Dewatering sludge 10t Outsourcing cost
3.1h * 3 people * 2,230 yen = 20,739 yen
20,739 yen * 119 days = 2,467,941 yen / year However, the hourly unit price of workers (per person): 2,230 yen The average time to carry out 10 tons of sludge generated by a press-type dehydrator is approximately 3.1 hours.

2. 2. Decanter type dehydrator Consignment cost to carry out 10 tons of dehydrated sludge
7.3h * 3 people * 2,230 yen = 48,837 yen 48,837 yen * 119 days = 5,811,603 yen / year Worker hourly unit price (per person): 2,230 yen The average time to carry out 10 tons of sludge generated by a decanter type dehydrator is about. 7.3 hours

3. 3. Reduction of annual consignment costs
5,811,603 yen-2,467,941 yen = 3,343,662 yen Therefore, the maximum labor cost can be reduced by 3,343,662 yen / year.

[Effect (3) Other effects]
1. 1. Effect when carrying out sludge Before changing the parameters, the water content of sludge was high and the draining of the filter cloth was insufficient, so water flowed into the cake hopper and dropped from the cake hopper carry-out port on the 2nd floor of the building to the 1st floor of the building. Was.

After changing the time of each control parameter, the water content of the dehydrated sludge decreased, and the sufficient draining time of the filter cloth was secured, so that the water did not stay in the cake hopper.

Since the sludge did not stay, the scattering of the dehydrated sludge was reduced when the dehydrated sludge was carried out, and the effect on safety was also obtained.

2. 2. Effect of extending the slag removal process time (environment, etc.)
By extending the slag removal process time, the adhesion of dehydrated sludge to the filter cloth was reduced.
Before changing the slag removal process time, the dehydrated sludge that could not be completely removed from the filter cloth was washed off during the filter cloth washing process and flowed into the gutter.

Since there was a concern that the inflowing dehydrated sludge would clog the gutters and the filter cloth washing water would overflow from the gutters, the patrol was strengthened by the shift staff. It was decided to contribute.

According to the method for dehydrating wastewater treatment sludge of the embodiment, since the mud supply step and the sedimentation step and the squeezing step and the sewage removal step proceed at the same time, an excellent effect that dehydrated sludge can be stably produced can be obtained. Can play.

Other than the embodiment, it can be appropriately changed within the scope of the present invention.

The wastewater treatment sludge dehydration treatment method of the present invention can be used for various wastewater treatments.

10 Mud supply means 12 Sludge storage tank (settling means)
14 Press type dehydrator (filtration means, squeeze means)
16 Drainage means 22 Mud supply pump 36 Cake hopper

Claims (5)

Wastewater treatment A dehydration treatment method for dehydrating sludge.
The sludge supply process and the sludge supply process
The sedimentation process to settle the supplied sludge and
A filtration process that filters sludge obtained by the sedimentation process,
The squeezing process for squeezing the sludge obtained by the filtration process,
It has a slag removal process that removes sludge remaining in the squeezing process.
A method for dehydrating wastewater-treated sludge, which comprises simultaneously proceeding with a mud supply step and a sedimentation step, and a squeezing step and a slag removal step. The method for dehydrating wastewater-treated sludge according to claim 1, wherein the pressing step is performed by a press-type dehydrator. When one cycle proceeds with the squeezing step and the scavenging step after proceeding with the mud feeding step, the settling step, and the filtration step, and when the squeezing step and the slagging step in the previous one cycle are advanced, The method for dehydrating wastewater-treated sludge according to claim 1 or 2, wherein the mud supply step and the settling step in the next one cycle proceed at the same time. When the dehydration treatment method is initially started from the stopped state, the first round of the process proceeds in the order of the mud feeding step, the settling step, the filtering step, the squeezing step, and the slag removal step, and the mud feeding step and the mud removing step are performed from the second round. The method for dehydrating wastewater-treated sludge according to claim 3, wherein the settling step proceeds at the same time as the pressing step and the slagging step. Wastewater treatment sludge dewatering equipment
Sewage sludge supply means and
A settling means for performing a settling step on the supplied sludge,
A filtration means that performs a filtration step on sludge obtained from the sedimentation means,
A squeezing means for performing a squeezing process of sludge obtained from a filtering means,
It has a slag removal means to remove sludge remaining in the squeezing means,
A wastewater treatment sludge dewatering facility characterized in that a mud supply step and a sedimentation step and a squeezing step and a slag removal step proceed at the same time.

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