KR102009452B1 - sludge concentrating and dehydrating system in Wastewater treatment process and method of the same - Google Patents

Abstract

The present invention relates to a sludge concentration and dewatering system and method of the sewage treatment process that can more effectively stabilize the sludge generated in the sewage treatment process and can be concentrated and dehydrated.

Description

Sludge concentrating and dehydrating system in Wastewater treatment process and method of the same}

The present invention relates to the field of wastewater treatment, and more particularly, to a sludge concentration and dewatering system and method of the wastewater treatment process that can more effectively stabilize the sludge generated in the wastewater treatment process and can be concentrated and dewatered.

If the wastewater is discharged without treatment, it can destroy the river or marine ecosystem or harm human health.The sludge is separated and managed separately from the wastewater through various treatment processes before discharge, and it does not deteriorate the sanitation of the water system. Only treated water that meets the water quality standards is discharged to the stream or ocean.

The treatment process of sewage water is divided into screening, flotation, filtration and physical treatment of precipitated sugar, chemical treatment such as neutralization, oxidation, reduction, flocculation and ion exchange, and biological treatment such as aerobic treatment or anaerobic treatment. Can be.

These unit processes are connected to form a whole wastewater treatment process, Figure 1 shows a general wastewater treatment process.

The wastewater introduced as inflow water is introduced into the primary sedimentation tank 20 after the sand or gravel is precipitated and removed in a silt chamber (not shown).

In the primary sedimentation tank (20), sedimentable solid particles (SS, suspended solids) in the waste water are precipitated and removed, together with organic matter (BOD, biochemical oxygen demand). In other words, BOD and SS are removed together.

The separated sludge is discharged separately as primary sludge or flows into the concentrating unit 50 described later. Influent water from which the sludge is separated is introduced into the reaction tank 10 to perform biological treatment. The reactor 10 is provided with an air supply means such as a compressor 15, the organic material not removed from the primary settling tank 20 is synthesized into an energy source and cells during the metabolic activity of the microorganisms in the reactor 10 and floc to form a float.

The influent treated in the reactor 10 is introduced into a secondary sedimentation tank 30. In the secondary sedimentation tank 30, the floc is precipitated and the solid-liquid separation is performed to discharge the treated water to the upper end of the process, and the secondary sludge is carried out to the concentrating unit 50.

The separated sludge is introduced into the concentrating unit 50 to be solidified by gravity sedimentation by being allowed to stand for several hours (for example, 8 to 20 hours), and when the supernatant is extracted, the concentration of the sludge is increased and concentrated.

The concentrated sludge is sent to the dehydrator 70. The dehydrator 70 may be configured with various kinds of concentrated sludge such as a vacuum filter, a filter press, a belt press, etc. Through this, the sludge is reduced in volume and is transported to the outside, and the desorption liquid generated in the process is transferred to the upper part of the process. do. The dehydrator 70 may be provided with a chemical supply unit 75 for supplying a chemical such as a flocculant for increasing the dehydration efficiency.

Here, since dehydration operation of the dehydrator 70 requires a lot of resources such as power or chemicals, there is a demand to increase the efficiency, accordingly, in most sewage treatment processes currently in operation, the dehydrator 70 is about one day. Only 8 hours of operation.

In other words, in the current wastewater treatment process, wastewater is continuously generated for 24 hours and flows into the wastewater treatment process, so that the capacity of the concentrating unit 50 can accommodate about three times the capacity of the dehydrator 70. The dehydrator 70 is only operated for about 8 hours a day.

That is, in the side of the condenser 50, about 8 hours a day when the dehydrator 70 is operated, the valve V is opened in the condenser 50 and the pump P is operated to dehydrate the sludge dehydrated 70. ), The dehydrator 70 does not operate for about 16 hours a day to close the valve (V) and stop the pump (P) to keep only the sludge flowing from the secondary settling tank (30). to be.

On the other hand, Patent Documents 1 to 4 discloses apparatuses and methods for composting sludges, but they also present apparatuses and methods for efficient fermentation of the sludges discharged, but sludge treatment generated in the wastewater treatment process. We still have the above problem.

2015-0085494 A 2013-0010952 A 2012-0105628 A 2007-0047893 A

Accordingly, the present invention has been made in view of the above-mentioned problems in the prior art, the sludge is concentrated in the wastewater treatment process and the sludge concentration of the wastewater treatment process to be discharged to be discharged in a state that can be reused, such as compost. It is an object to provide a dewatering system and method.

Specifically, the thickening unit does not simply store sludge while the dehydrator is not running, but a separate operation is performed to allow sludge re-assembling, reducing the amount of sludge taken out, and reducing the smell of sludge. In addition, the present invention seeks to provide a novel process that can increase the dehydration efficiency and reduce the amount of chemicals involved in the dehydration process.

In order to achieve the above object, the present invention, the primary sedimentation tank 200 in which the suspended solids contained in the introduced sewage is sedimented into the first sludge, the inflow water in the primary sedimentation tank 200 is accommodated is processed by the microorganisms In the wastewater treatment process comprising a reaction tank 100 and a secondary sedimentation tank 300 in which the influent treated in the reaction tank 100 is separated into treated water and secondary sludge, the precipitated in the secondary sedimentation tank 300 A sludge thickening tank 500B into which secondary sludge is introduced; A dehydrator 700 in which secondary sludge concentrated in the sludge concentration tank 500B is introduced and dehydrated; A pump (P) and a sludge valve (V2) provided at each of the dewatering lines into which the secondary sludge flows into the dehydrator (700B) from the sludge concentration tank (500B); An air valve (V1) provided in the recirculation line to the sludge thickening tank (500B) by the pump (P) as a branch branching from the dewatering line; And a microbubble supply unit 400 provided at a rear end of the air valve V1 to introduce the secondary sludge stored in the sludge thickening tank to mix microbubbles with the air for a predetermined first time. The valve V1 is opened and the sludge valve V2 is closed, so that the secondary sludge stored in the sludge thickening tank 500B, which is the front end of the dehydrator 700, passes through the microbubble supply unit 400 and is mixed. By being supplied back to the sludge thickening tank 500B together with the fine bubbles, it is ready to flow into the dehydrator 700, the air valve (V1) is closed for a second predetermined time, the sludge valve (V2) is Secondary sludge, which is stored in the sludge thickening tank 500B and is mixed with microbubbles, is introduced into the dehydrator 700 and discharged after being dehydrated, and the dehydrator 700 is discharged after the predetermined second. After dehydrating the secondary sludge supplied with the microbubble to be discharged to the outside for a time, if the concentration of the secondary sludge stored in the sludge thickening tank 500B is higher than a predetermined concentration in the dehydrator 700 The desorption liquid is introduced into the sludge concentration tank (500B) to reduce the load of the dehydrator 700, the first time and the second time is continuously and alternately progressed, the microbubble supply unit 400 is The dehydrator 700 provides a sludge concentration and dewatering system for sewage treatment that continues to operate only for a first time and continues to operate for only a second time.

The microbubble supply unit 400 is provided at one side, and an inlet 410 into which the secondary sludge flows from the sludge concentration tank 500B; A mixing part 420 extending from the inlet 410; An air inlet 430 provided at one side of the mixing part 420 and into which the air is introduced; An air distribution part 440 branched from the air inlet 430 to communicate with the mixing part 420; And an outlet port 450 extending from the mixing unit 420, and distributed through the secondary sludge and the air inlet port 430 and the air distribution unit 440 introduced into the inlet port 410. Air is preferably mixed in the mixing unit 420 and a swirl flow is generated and supplied to the sludge thickening tank 500B through the outlet 450.

The amount of air mixed into the secondary sludge may vary depending on the flow rate, temperature, or DO value of the secondary sludge.

In addition, in the sludge concentration and dewatering method using the sludge concentration and dehydration system of the sewage treatment process, (a) suspended solids contained in the introduced sewage is precipitated into the primary sludge, and in the primary sedimentation tank 200 Sewage is treated by the microorganism, the treated sewage is separated into the treated water and the secondary sludge (S100); (b) storing the secondary sludge in the sludge thickening tank 500B (S200); (c) During the predetermined first time period, the air valve V1 is opened and the sludge valve V2 is closed, so that the stored secondary sludge flows into the microbubble supply unit 400 and the microbubbles are discharged. Mixed and supplied back to the sludge concentration tank (500B) is stored (S300); (d) During the second predetermined time, the air valve V1 is closed and the sludge valve V2 is opened, whereby the secondary air is mixed with the microbubbles and the secondary sludge stored in the sludge thickening tank 500B is discharged. Inflow to the dehydrator 700 is dewatered (S400); And (e) discharging the secondary sludge dewatered from the dehydrator 700 to the outside. The sludge concentration and dewatering method of the sewage treatment process is provided.

According to the sludge concentration and dewatering system and method of the sewage treatment process according to the present invention as described above, by supplying the microbubbles to the secondary sludge flowed into the concentrated part accommodated by the stabilization of nitrogen contained in the secondary sludge Odor reduction and subsequent load in the dehydrator reduces the dehydration efficiency and the use of flocculant, as well as the stabilized nitrogen is included in the discharged sludge has the advantage that it is easy to commercial use, such as compost without any additional post-treatment.

1 is a conceptual diagram illustrating a conventional wastewater treatment process.
2 is a conceptual view illustrating a sludge concentration and dewatering system of a wastewater treatment process according to a first embodiment of the present invention.
3 is a conceptual view illustrating a sludge concentration and dewatering system of a wastewater treatment process according to a second embodiment of the present invention.
4 is a conceptual view illustrating a sludge concentration and dewatering system of a wastewater treatment process according to a third embodiment of the present invention.
5 is a detailed cross-sectional view of the microbubble supply device.
6 is a flow chart of the sludge concentration and dewatering method of the sewage treatment process according to the present invention.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be described based on the contents throughout the specification.

In addition, the described embodiments are provided by way of example for purposes of illustration, and do not limit the technical scope of the present invention.

Each component constituting the sludge concentration and dewatering system of the wastewater treatment process according to the present invention may be used integrally or separately separated as necessary. In addition, some components may be omitted depending on the form of use.

Hereinafter, a sludge concentration and dewatering system (hereinafter, simply referred to as a 'system') of a wastewater treatment process according to the present invention will be described with reference to FIGS. 2 to 5. 2 shows a system according to the first embodiment of the present invention, FIG. 3 shows a system according to the second embodiment of the present invention, and FIG. 4 shows a system according to the third embodiment of the present invention. .

In the first and second embodiments to be described below, the concentrator 500 is a sludge storage tank 500A. That is, it is a case where sludge is mixed without solid-liquid separation. In the third embodiment, the concentrating unit 500 is a sludge thickening tank 500B. In other words, the sludge is solid-liquid separation. In the following, the concentrator 500 is not directly shown in Figs. 2 to 4, but it is noted that the name encompasses both the sludge storage tank 500A and the sludge concentration tank 500B.

First, the system according to the first embodiment will be described with reference to FIGS. 2 and 5. As shown in Figure 2, the system according to the first embodiment of the present invention, the reaction tank 100, the primary settling tank 200, the secondary settling tank 300, the concentration unit 500 (that is, sludge storage tank ( 500A), the dehydrator 700 and the microbubble supply unit 400.

The primary sedimentation tank 200 first precipitates the sedimentable suspended solids in the contaminants contained in the influent and discharges and treats the precipitated sludge as the primary sludge.

When the treated water passing through the primary settling tank 200 flows into the reaction tank 100, some of the organic pollutants in the influent are decomposed and processed by the aerobic microorganisms in the reaction tank 100, and the other part is synthesized into microbial cells. Spills.

The compressor 150 is connected to the reactor 100 to supply air to the reactor 100, thereby helping the aerobic microorganisms in the reactor 100.

The secondary settling tank 300 is connected to the rear end of the reaction tank 100, and after the precipitated secondary sludge discharges the treated water.

 The sludge storage tank 500A is connected to the secondary settling tank 300 and the secondary sludge precipitated in the secondary settling tank 300 is introduced and stored.

Although not shown, some of the secondary sludge discharged from the secondary sedimentation tank 300, in order to maintain the food-to-microorganism ratio (F / M ratio) in the reaction tank 100, some of the precipitated secondary sludge is returned It may be returned to the reaction tank 100 as sludge, and another part may flow into the sludge storage tank 500A and be concentrated.

On the other hand, the microbubble supply unit 400 is connected to the sludge storage tank (500A), and generates air to supply air to the sludge storage tank (500A). That is, by supplying air to the secondary sludge concentrated in the sludge storage tank 500A and aeration, NH 4 contained in the secondary sludge is converted into NO 3 and stabilized.

In addition, a portion of the secondary sludge concentrated in the sludge storage tank 500A may be introduced into the microbubble supply unit 400 to mix air to be supplied into the sludge storage tank 500A.

Referring to FIG. 5, the configuration of the microbubble supply unit 400 will be described in more detail. The microbubble supply unit 400 includes an inlet 410, a mixing unit 420, an air inlet 430, and an air distribution unit. 440 and outlet 450.

The inlet 410 is located at one side of the microbubble supply unit 400, is connected to the concentrator 500, and the secondary sludge may be introduced at a high speed through the pump P from the concentrator 500.

The mixing part 420 extends from the inlet 410, and the secondary sludge introduced through the inlet 410 flows.

The air inlet 430 is provided at one side of the mixing unit 420, and air for supplying to the concentrating unit 500 is introduced through the air inlet 430, and the air introduced therein is a secondary sludge introduced at a high speed. By the negative pressure generated inside the mixing unit 420 may be naturally intake.

Alternatively, a compressor (not shown) for supplying air to the air inlet 430 may be separately provided, or air may be supplied from the compressor 150 connected to the reactor 100.

One side of the air distribution unit 440 is connected to a plurality of branches from the air inlet 430, the other side of the branch is in communication with the mixing unit 420, the air introduced into the air inlet 430 is distributed and the mixing unit The air flowing to the mixing unit 420 and the mixing unit 420 is mixed with the secondary sludge passing through the mixing unit 420 and aerated to generate micro bubbles, and the generated micro bubbles are mixed with the mixing unit 420. Swirl flows through the communicating outlet 450 and is supplied to the concentrating unit 500.

Swirl flow is a flow generated by axial flow and circumferential flow around the axis when the fluid flows in the tangential direction of the cylindrical tube. Secondary sludge and air introduced in the uniaxial direction through the inlet 410 are introduced. Air introduced in the circumferential direction through the inlet 430 and the air distribution unit 440 is mixed in the mixing unit 420 to form a swirl flow and the air is finely separated to generate fine bubbles to supply to the concentrating unit 500. do.

As the microbubbles constituting the swirl flow are supplied to the concentrating unit 500, the contact surface area between the air and the secondary sludge is increased, thus increasing the stabilization efficiency of NH 4 contained in the secondary sludge.

In addition, as described above, the air may be naturally intake through the air inlet 430 by the secondary sludge passing through the mixing unit 420, so that a separate power for supplying air is not necessary, There is no energy consumption to supply air to the 500, so it is possible to maintain an economical system.

Referring back to FIG. 2, the dehydrator 700 is connected to the sludge storage tank 500A so that secondary sludge (or secondary sludge containing microbubbles) is introduced into the dehydrator 700, and the introduced secondary sludge is introduced. Moisture contained in becomes the desorption liquid and is returned to the top of the process.

The drug supply unit 750 for supplying a flocculant such as a polymer to the dehydrator 700 may be connected to facilitate the dehydration and aggregation of the secondary sludge in the dehydrator 700.

Secondary sludge dewatered from the dehydrator 700 is discharged in the form of a solid cake (cake), it can be used as a compost without undergoing post-treatment.

delete

Hereinafter, the sludge concentration and dewatering method of the wastewater treatment process according to the first embodiment of the present invention will be described in detail with reference to the accompanying FIG. 6.

First, the suspended solids contained in the influent is precipitated as primary sludge in the primary settling tank 200, the treated water is accommodated in the reaction tank 100 is processed by the microorganisms, included in the treated water in the reaction tank 100 Suspended substances are precipitated as secondary sludge in the secondary settling tank (S100). That is, the inflow water introduced into the secondary sedimentation tank 300 is separated into secondary sludge and treated water.

Next, the secondary sludge precipitated in the secondary settling tank 300 is introduced into the sludge storage tank 500A is stored (S200).

Secondary sludge in the sludge storage tank 500A is branched by the operation of the valves V1 and V2 as shown in FIG. 2. In the first embodiment to be described, the second sludge is branched depending on whether the dehydrator 700 is operated.

During the first predetermined time, microbubbles are supplied to the stored secondary sludge (S300).

Microbubbles are supplied during the first predetermined time period during which the dehydrator 700 does not operate (for example, the remaining 16 hours if the dehydrator 700 operates only for 8 hours a day as described in the related art).

That is, according to the prior art, the secondary sludge was only stored in the concentrator 50 during the time when the dehydrator 70 was not operated (see FIG. 1), but in the present invention, the microbubbles were supplied during the time.

Specifically, during the first predetermined time period, the valve V2 is closed, the valve V1 is opened, and the pump P is continuously driven so that some of the secondary sludge accommodated in the sludge storage tank 500A is supplied to the microbubble supply unit. Inflow to (400). The introduced secondary sludge is mixed with air, the mixed secondary sludge and air are supplied to the sludge storage tank 500A, and the secondary sludge is aerated.

Here, the pump (P) providing power for injecting microbubbles is a conventional pump for transferring the secondary sludge to the dehydrator (700). Referring to Figure 1, the existing equipment is provided with both pumps to transfer the secondary sludge to the dehydrator 70, it is to use it as it is without additional equipment.

In addition, the pump P, which will be described later, is operated during the second time of transferring the secondary sludge to the dehydrator 700, and is continuously operated continuously. According to the prior art, since the pump P operates only during the second time that the dehydrator 70 is operated, there is a difference in operating time.

In addition, the mixing amount of the secondary sludge and air in the microbubble supply unit 400 is changed according to the flow rate, temperature or DO value of the secondary sludge flowing into the concentrator 500, the sensor for detecting this secondary It may be provided on a line connecting the settling tank 300 and the sludge storage tank (500A).

Next, when the first predetermined time elapses, the secondary sludge is dewatered during the second predetermined time (S400).

Specifically, during the second predetermined time, the valve V1 is closed, the valve V2 is opened, and the pump P is continuously driven to be stored in the sludge storage tank 500A and at the same time aerated by microbubbles. Primary sludge is introduced into the dehydrator 700, and the water contained in the concentrated secondary sludge is dewatered. At this time, the flocculant may be supplied from the drug supply unit 750 to the dehydrator 700.

Here, the steps S300 and S400 may be alternately performed for each predetermined time, specifically, for the first time and the second time as described above.

In general, the wastewater treatment system has a daily operation, wherein about 16 hours of the daily operation time is the first time, and fine bubbles are supplied to the sludge storage tank 500A during the corresponding time, and the remaining about 8 hours As the second time, the secondary sludge is introduced into the dehydrator 700 during the corresponding time so that dehydration is performed, which may be achieved by controlling the respective valves and pumps.

According to the sludge concentration and dewatering system and method of the sewage treatment process according to the present invention as described above, by supplying a microbubble to the secondary sludge introduced into the sludge storage tank (500A) to aeration of the nitrogen contained in the secondary sludge Odor reduction due to stabilization and subsequent load on the dehydrator 700 reduces the dehydration efficiency and the amount of flocculant used, as well as stabilized nitrogen is included in the discharged sludge, so that commercial use such as composting without additional treatment It has the advantage of being easy.

In addition, existing equipment is used as is and additional equipment is minimized. Newly added equipment in the present invention is a branch pipe of the pipe facing the dehydrator 700, the valve (V1) and the microbubble supply unit 400 provided therein. The power for supplying the microbubbles is utilized by the pump (P) provided in the pipe facing the existing dehydrator 700 as it is, according to the prior art the time that the pump (P) does not operate, in the present invention is the first time The pump P only works.

A second embodiment of the present invention will now be described with reference to FIG. The difference from the first embodiment will be mainly described.

In the second embodiment, sludge storage tank 500A is also used as the concentrating unit 500. Unlike the first embodiment, the secondary sludge is not supplied to the microbubble supply unit 400, but the microbubble supply unit 400 directly supplies the microbubbles to the sludge storage tank 500A. In this case, a separate pump Pa is required.

Unlike the first embodiment, an expensive pump Pa is required, which is a disadvantage in terms of initial installation cost. However, there is an advantage in that the microbubbles can be continuously supplied while the dehydrator 700 is operated.

That is, in the first embodiment, the microbubbles were supplied only during the first time when the dehydrator 700 was not operated and the microbubbles could not be supplied during the second time when the dehydrator 700 was operated. According to this, even while the dehydrator 700 is operated, the pump Pa may be operated to supply the microbubbles to the sludge storage tank 500A.

A third embodiment of the present invention will be described with reference to FIG.

Unlike the first embodiment and the second embodiment, the concentration unit 500 is a sludge concentration tank 500B rather than a sludge storage tank 500A, where solid-liquid separation of secondary sludge is performed. The solid-liquid separated supernatant (ie, the solid-liquid separated supernatant in the sludge thickening tank 500B) may be returned to the top of the process (indicated by the arrow as returned to the secondary settling tank 300 in FIG. 4). In this case, since the water content of the sludge flowing into the dehydrator 700 is lowered (that is, the concentration is lowered), the load of the dehydrator 700 is lowered.

Meanwhile, as in the first and second embodiments, only the solid-liquid separated sludge (that is, the solid-liquid separated sludge in the sludge thickening tank 500B) flows into the dehydrator 700 during the second time (in the sludge thickening tank in FIG. 4). See the line from 500B to the dehydrator 700). When the dehydrator 700 is operated, a desorption liquid, which is water dehydrated separately from the sludge discharged outside, is generated. In the first and second embodiments, the desorption liquid is returned to the upper end of the process, but in the third embodiment, the valve V3 is operated. It can collect | recover from sludge concentration tank 500B. When the desorption liquid is recovered in the sludge thickening tank 500B, the concentration of the secondary sludge is so high that it is difficult to separate the solids of the sludge thickening tank 500B and the sludge is not smoothly transferred from the sludge thickening tank 500B to the dehydrator 700. would.

While preferred embodiments of the present invention have been described above, the present invention is not limited to the above specific embodiments. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications are possible. Equivalents should be considered to be within the scope of the present invention.

10, 100: reactor
20, 200: primary sedimentation tank
30, 300: secondary settling tank
400: microbubble supply unit
50, 500: concentration part
500A: sludge storage tank
500B: sludge thickener
70, 700: dehydrator

Claims (7)

As a method of sludge concentration and dewatering in a sewage treatment system operating on a daily basis,
(a) inflow of water into the primary sedimentation tank 200 to separate primary sludge and treated water;
(b) the separated treated water is introduced into the reaction tank 100 to perform biological treatment;
(c) separating the treated sludge and the treated water by introducing the treated water subjected to the biological treatment into the secondary settling tank 300;
(d) the secondary sludge is introduced into the sludge thickening tank (500B) and left to be solid-liquid separated by gravity settling;
(e) During the first preset time, the pump P provided at the front end of the dehydrator 700 is operated and the valve V2 is closed to supply microbubbles to the secondary sludge introduced into the sludge thickening tank 500B. Supplying microbubbles through the 400; A flow path connecting the sludge thickening tank 500B and the dehydrator 700 is branched and connected to the microbubble supply unit 400, and the pump P is positioned at the front end of the branch portion, and the valve V2 is Located between branch and dehydrator 700-
(f) The predetermined first time has elapsed, and the pump P provided at the front end of the dehydrator 700 continues to operate and the valve V2 is opened for the second predetermined time, so that the microbubble is opened. Receiving the secondary sludge supplied to the dehydrator 700 to be dehydrated;
(g) simultaneously with the step (f), for the second predetermined time, the secondary sludge dehydrated in the dehydrator 700 is discharged to the outside and a desorption liquid is generated; And
(h) Simultaneously with the step (f), the load of the dehydrator 700 is increased only when the concentration of the secondary sludge introduced into the sludge concentration tank 500B is higher than a predetermined concentration for the preset second time. In order to lower, the desorption liquid generated in the dehydrator 700 includes the step of flowing into the sludge thickening tank (500B),
The preset first time is 16 hours and the preset second time is 8 hours, so that the first time and the second time are continuously performed during daily unit operation, and when the preset second time elapses, the ( By returning to step e), the sludge thickening tank 500B positioned at the front of the dehydrator 700 is continuously used while the steps (e) and (f) to (h) are alternately and continuously performed, Since the pump P is continuously used without stopping for 24 hours, the pump P provides power for supplying microbubbles to the sludge thickening tank 500B during the first time, and the sludge thickening tank 500B during the second time. To provide the power for transferring the secondary sludge in the dehydrator 700,
In the step (e), the supernatant generated by the solid-liquid separation of the secondary sludge in the sludge concentration tank 500B is conveyed to the secondary sludge in the secondary sedimentation tank 300, thereby loading the dehydrator 700. Further comprising lowering
Only when the secondary sludge concentration in the sludge thickening tank 500B is higher than the predetermined concentration, the desorption liquid flows into the sludge thickening tank 500B. It is conveyed to the secondary sedimentation tank 300, and the density | concentration of the secondary sludge in the said sludge concentration tank 500B is maintained within a predetermined range,
Sludge Concentration and Dewatering Method of Sewage Water Treatment Process.
The method of claim 1,
Step (f),
Comprising the micro-bubble through the microbubble supply unit 400 is continuously supplied to the secondary sludge introduced into the sludge thickening tank (500B) for the second predetermined time,
Sludge Concentration and Dewatering Method of Sewage Water Treatment Process.
The method of claim 2,
Another pump Pa is provided in a flow path for supplying microbubbles to the sludge thickening tank 500B in the microbubble supply unit 400.
The microbubbles supplied during the first time are supplied by the pump P,
The microbubble supplied during the second time is supplied by the other pump Pa,
Sludge Concentration and Dewatering Method of Sewage Water Treatment Process.
delete delete The method of claim 1,
The microbubble supplied in the step (e) is a microbubble generated by introducing air into the secondary sludge.
Sludge Concentration and Dewatering Method of Sewage Water Treatment Process.
The method according to any one of claims 1, 2, 3, 6 is made,
Sludge Concentration and Dewatering System for Sewage Treatment Process.

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