JP2016175029A - Flocculation precipitation treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flocculation precipitation treatment apparatus capable of suppressing the deterioration of clarity of treated water even when a periodic maintenance is not performed.SOLUTION: A flocculation precipitation treatment apparatus 100 includes: a bottom plate 21 for dividing sludge into a sludge blanket part 3 and a concentration part 4; a shaft 8 which penetrates the bottom plate 21 and is provided rotatably; and gas sealing means 31 which prevents outflow to the concentration part 4 of sludge in the sludge blanket part 3 from between the bottom plate 21 and the shaft 8. Thus, the bottom plate 21 and the shaft 8 are sealed by the gas sealing means 31, thereby, a sealing member for performing the sealing according to sliding contact is made unnecessary, abrasion does not occur and, therefore, sealing performance between the bottom plate 21 and the shaft 8 is not deteriorated because of elapse of time. Accordingly, even when a periodic maintenance accompanied by replacement of a sealing part is not performed, it is prevented that sludge in the sludge blanket part 3 flows out to the concentration part 4 from between the bottom plate 21 and the shaft 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coagulation sedimentation processing apparatus.

  As an example of the coagulation sedimentation processing apparatus, an apparatus described in Patent Document 1 below is known. In this coagulation sedimentation treatment device, a distributor for uniformly supplying the treated water (raw water) into the sedimentation tank is attached to the rotatable lower center well, and the treated material discharged from the rotating distributor The flocs and particles in the water are trapped by the sludge by passing through the sludge (sludge) zone formed in a blanket-like floating state, and the flocs aggregated by passing through the sludge zone are below the sludge zone. The water to be treated is separated by filtration by precipitation and concentration. In the coagulation sedimentation processing apparatus, a rubber plate for sealing between the rotatable lower center well and the fixed upper center well is slidably provided. By this rubber plate, the water to be treated flowing from the upper center well to the lower center well is prevented from flowing into the sedimentation tank without passing through the distributor.

JP 2002-126407 A

  When the seal member is in sliding contact with the mating member in order to seal between the rotating lower center well and the fixed upper center well, like the rubber plate of Patent Document 1, the seal member Since the seal performance deteriorates due to wear over time, regular maintenance such as replacement of the seal member is required. In addition, when the coagulation sedimentation processing apparatus is driven while the seal member is worn and leakage occurs, the treated water tends to become cloudy and the clarity of the treated water may be reduced.

  The present invention has been made to solve such a problem, and provides a coagulation sedimentation treatment apparatus capable of suppressing a decrease in the clarification of treated water without performing regular maintenance accompanying replacement of a seal portion. The purpose is to do.

  The coagulation sedimentation treatment apparatus according to one aspect of the present invention is a sludge blanket type, wherein the sludge is formed in a blanket shape, and is provided under the sludge blanket portion for capturing flocs in the water to be treated, and the sludge is concentrated. The sludge in the sludge blanket part flows out to the concentrating part from between the concentrating part, the bottom plate for partitioning into the sludge blanket part and the concentrating part, the shaft penetrating the bottom plate and rotatably provided, and the bottom plate and the shaft. And gas sealing means for preventing this.

  According to such a coagulation sedimentation processing apparatus, since the space between the bottom plate and the shaft is sealed by the gas accommodated in the gas sealing means, a sealing member (for example, a rubber plate) that seals by sliding contact is unnecessary. There is no generation of wear and there is no deterioration in the sealing performance between the bottom plate and the shaft over time. This prevents sludge in the sludge blanket part from flowing out from between the bottom plate and the shaft to the concentrating part without performing regular maintenance accompanying replacement of the seal part, and the function of the sludge blanket part is fully exhibited. As a result, a decrease in the clarity of the treated water can be suppressed.

  Moreover, the coagulation sedimentation processing apparatus according to another aspect of the present invention is provided in a sludge blanket portion in which sludge for capturing flocs in the water to be treated and a flow path through which the water to be treated flows and formed in a blanket shape. A center well for partitioning, a rotating body that is rotatably provided below the center well, and causes the water to be treated supplied from the flow path to flow into the partition in which the sludge blanket portion is accommodated, a center well, Gas sealing means for preventing the water to be treated in the flow path from flowing into the compartment from between the rotating bodies.

  According to such a coagulation sedimentation processing apparatus, since the space between the center well and the rotating body is sealed by the gas accommodated in the gas sealing means, a seal member for sealing by sliding contact is not required, and wear occurs. There is no deterioration of the sealing performance between the center well and the rotating body over time. As a result, the water to be treated in the flow path flows from between the center well and the rotating body into the compartment in which the sludge blanket part is accommodated without passing through the rotating body, without performing periodic maintenance accompanying replacement of the seal section. As a result, the function of the sludge blanket part is sufficiently exhibited, and as a result, a decrease in the clarity of the treated water can be suppressed.

  Here, it is preferable that the said coagulation sedimentation processing apparatus is provided with the gas supply means for supplying gas in a gas sealing means. Thereby, since the area | region filled with gas is always formed in the gas sealing means, the sealing performance of this gas sealing means can be improved.

  Moreover, it is preferable that the gas sealing means is provided with a concave portion that is opened downward and is provided so that gas accumulates, and a protruding portion that enters the concave portion. By providing the protrusions that enter the recesses in this way, the gas-filled means in the gas-filled area is made into an inverted U-shaped cross section, and the gas is less likely to leak. The sealing performance can be further improved.

  Here, the concave portion includes an inner peripheral wall and an outer peripheral wall forming the concave portion, the outer peripheral wall is longer in the height direction than the inner peripheral wall, and is further provided inside the inner peripheral wall to discharge excess gas in the concave portion. The gas discharge means may be provided. As a result, surplus gas in the concave portion is not discharged outside the outer peripheral wall beyond the outer peripheral wall, but is exhausted inside the inner peripheral wall beyond the inner peripheral wall shorter than the outer peripheral wall in the height direction. Further, the gas is discharged through a gas discharge means. For this reason, the sealing performance of the gas sealing means can be further improved.

  The concave portion includes an inner peripheral wall and an outer peripheral wall that form the concave portion, the inner peripheral wall is longer in the height direction than the outer peripheral wall, and is provided between the inner peripheral wall and the outer peripheral wall to discharge excess gas in the concave portion. The gas inlet of the gas discharger may be located between the tip end surface of the protrusion and the tip end surface of the outer peripheral wall in the height direction. Thereby, the excess gas in the recess is not discharged outside the outer peripheral wall beyond the outer peripheral wall, but is discharged from the gas discharge means. For this reason, the sealing performance of the gas sealing means can be further improved.

  Further, the concave portion includes an inner peripheral wall and an outer peripheral wall forming the concave portion, the outer peripheral wall is longer in the height direction than the inner peripheral wall, and further includes gas discharge means for discharging excess gas in the concave portion, The gas inlet of the gas discharge means may be located between the tip end surface of the protruding portion and the tip end surface of the inner peripheral wall in the height direction. As a result, the excess gas in the recess is not discharged from the gas discharge means, but beyond the inner peripheral wall and inside the inner peripheral wall and beyond the outer peripheral wall to the outer side. For this reason, the sealing performance of the gas sealing means can be further improved.

  As described above, according to the present invention, it is possible to provide a coagulation sedimentation treatment apparatus that can suppress a decrease in the clarification of treated water without performing regular maintenance accompanying replacement of the seal portion.

It is a schematic sectional drawing which shows the coagulation sedimentation processing apparatus which concerns on embodiment of this invention. It is the schematic sectional drawing which expanded the gas sealing means of the coagulation sedimentation processing apparatus which concerns on embodiment of this invention. It is the schematic sectional drawing which expanded the gas sealing means of the lower side in FIG. It is the schematic sectional drawing to which the gas sealing means of the coagulation sedimentation processing apparatus which concerns on the other example of embodiment of this invention was expanded. It is the schematic sectional drawing to which the gas sealing means of the coagulation sedimentation processing apparatus which concerns on the other example of embodiment of this invention was expanded. It is the schematic sectional drawing to which the gas sealing means of the coagulation sedimentation processing apparatus which concerns on the other example of embodiment of this invention was expanded.

  Hereinafter, preferred embodiments of a coagulation sedimentation processing apparatus according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic cross-sectional view showing a coagulation sedimentation processing apparatus according to an embodiment. As shown in FIG. 1, the coagulation sedimentation treatment apparatus 100 captures the treated water inflow part 2 for introducing (introducing) treated water such as sewage into the sedimentation tank 1 and flocs and particles in the treated water. The sludge blanket part 3 is formed in a state where sludge for floating in a blanket form, and the concentrating part 4 in which flocs aggregated by passing through the sludge blanket part 3 are precipitated and concentrated under the sludge blanket part 3 are arranged. Moreover, it is a sludge blanket type coagulation sedimentation processing apparatus. A clarified layer 5 which is a supernatant is formed on the sludge blanket part 3, and the clarified treated water is discharged from the treated water discharge part 6 located on the upper side of the apparatus. Further, the floc (sludge) precipitated and concentrated in the concentration unit 4 is discharged from the center of the bottom of the settling tank 1 through the sludge discharge unit 7.

  The treated water inflow portion 2 extends in the horizontal direction, penetrates the peripheral wall 1a of the settling tank 1 and enters the inside, and is connected to the inflow pipe 11 and the inflow pipe 11 for supplying the treated water into the settling tank 1 And a center well 12 extending in the vertical direction (height direction) at the center of the sedimentation tank 1. The center well 12 is a cylindrical hollow member, and is fixed to partition the flow path 2a through which the water to be treated flows and the sludge blanket portion 3 formed around the center well 12. It is a member. A shaft 8 extending along a height direction (hereinafter simply referred to as a height direction) is disposed inside the center well 12, and the shaft 8 is a drive device 9 such as a motor attached to the upper end. Can be rotated around the axis. The center well 12 and the shaft 8 are not in contact with each other, and the shaft 8 passes through the center well 12. The treated water flowing through the flow path 2a in the treated water inflow portion 2 is added with a flocculant at the upstream, for example, the flocculant adding portion F. It may be added. When a flocculant is added in the to-be-processed water inflow part 2, the flocculant addition part F need not be provided.

  The sludge blanket section 3 is a flock growth zone in which flocs and particles in the water to be treated supplied from the flow path 2a via a rotating body 41 described later are captured and aggregated by sludge floating in a blanket shape. The sludge blanket portion 3 is provided with an opening 21a at the center and horizontally disposed on the lower side in the sedimentation tank 1, and extends upwardly projecting from a part of the outer peripheral end of the bottom plate 21. The side wall 22 connected to the peripheral wall 1a is accommodated in a compartment defined above the bottom plate 21 in the sedimentation tank 1 and on the inner peripheral side of the side wall 22. The lower end of the center well 12 described above is located above the bottom plate 21. Since the bottom plate 21 is attached to the peripheral wall 1a in the settling tank 1, the bottom plate 21 and the side wall 22 are fixed members. The shaft 8 described above passes through the bottom plate 21 through the opening 21 a and extends downward from the bottom plate 21.

  A hollow rotating body 41 fixed to the shaft 8 is provided below the center well 12 and above the bottom plate 21. The rotating body 41 includes a hollow central portion that communicates with the center well 12 and a plurality of distributors that communicate with the central portion and extend in the radial direction. Thereby, to-be-processed water flows in into a distributor from the flow path 2a in the center well 12 via a center part. In the lower surface of each distributor of the rotating body 41, a plurality of openings 41a are provided along the longitudinal direction (horizontal direction), and the water to be treated supplied from the flow path 2a via these openings 41a. Is allowed to flow into the compartment in which the sludge blanket portion 3 is accommodated. By using such a rotating body 41, the water to be treated is supplied evenly dispersed in the sludge blanket section 3.

  The concentrating part 4 is partitioned by the above-described bottom plate 21 and is located below the sludge blanket part 3, and flocs aggregated by passing through the sludge blanket part 3 in an upward flow are formed between the side wall 22 and the peripheral wall 1a. A flocs precipitation zone that settles and concentrates between. A lower end portion of the shaft 8 extends through the bottom plate 21 into the concentration portion 4, and a rake 42 is attached to the lower end portion. The rake 42 is provided to scrape the sludge settled in the concentration unit 4 to the center of the bottom surface in the settling tank 1 and collect it from the sludge discharge unit 7.

  In the coagulation sedimentation treatment apparatus 100, a lower gas sealing means 31 is provided between the fixed bottom plate 21 and the rotating shaft 8, and the fixed center well 12 and the rotating rotating body 41 are connected to each other. An upper gas sealing means 32 is provided between them. The lower gas sealing means 31 is for preventing sludge from leaking from the sludge blanket part 3 to the concentrating part 4, and along the circumferential direction of the shaft 8 (hereinafter simply referred to as the circumferential direction). It is provided in a ring shape. The upper gas sealing means 32 is for preventing the water to be treated from being supplied directly from the flow path 2 a of the center well 12 into the sludge blanket section 3. Is provided annularly along the circumferential direction. The gas stored in the lower gas sealing means 31 and the upper gas sealing means 32 is not particularly limited, and is, for example, air, oxygen, nitrogen, or the like.

  Next, details of the lower gas sealing means 31 and the upper gas sealing means 32 will be described with reference to FIGS. 2 is an enlarged schematic sectional view of the gas sealing means of the coagulation sedimentation processing apparatus according to the embodiment, and FIG. 3 is an enlarged schematic sectional view of the lower gas sealing means in FIG.

  First, the lower gas sealing means 31 will be described. As shown in FIG. 2 and FIG. 3, a disk-shaped plate-like member 8 a extending in the radial direction is penetrated by the shaft 8 between the rotating body 41 of the shaft 8 and the bottom plate 21 in the height direction. It is fixed. The plate-like member 8 a is configured as a part of the shaft 8 and serves also as the bottom of the central portion of the rotating body 41. An annular outer peripheral wall 54 that protrudes downward is provided at the peripheral end of the plate-like member 8a. The plate-like member 8a is provided with an annular inner peripheral wall 53 that is located on the inner peripheral side with respect to the outer peripheral wall 54 and protrudes downward. An annular recess 51 opened downward so as to store gas is formed by the inner peripheral wall 53 and the outer peripheral wall 54 of the plate-like member 8a, and the annular portion connecting the inner peripheral wall 53 and the outer peripheral wall 54. In the recess 51, the outer peripheral wall 54 is longer in the height direction than the inner peripheral wall 53. On the other hand, the bottom plate 21 has an annular protrusion 52 that protrudes upward from the edge of the opening 21 a, and the protrusion 52 enters the inside of the recess 51. By filling the recess 51 into which such a protrusion 52 has been filled with gas, the lower gas sealing means 31 that is annular and has an inverted U-shaped cross section is formed.

  Here, the required height (the length of the gas in the height direction) H of the gas filled in the lower gas sealing means 31 is the specific gravity s1 of the sludge in the sludge blanket portion 3 and the concentration in the concentration portion 4. It can be calculated from the specific gravity s2 of the supernatant water and the height of the sludge blanket part 3 (that is, the height of the side wall 22) h1. The required height H of the gas to be filled is preferably H = h1 × (s1−s2) × safety factor in consideration of machine manufacturing margins (shaft fluctuation, error, etc.).

  Next, the upper gas sealing means 32 will be described. As shown in FIG. 2, an annular extending member 12a extending in the radial direction is connected to an annular inner peripheral wall 63 which is the lower end portion of the center well 12, and the extending end of the extending member 12a is connected downward. A projecting outer peripheral wall 64 is provided in an annular shape. An annular recess 61 that is opened downward so as to store gas is formed by the inner peripheral wall 63 and the outer peripheral wall 64 and the annular member that connects the inner peripheral wall 63 and the outer peripheral wall 64. In the recess 61, the outer peripheral wall 64 is longer than the inner peripheral wall 63 in the height direction. On the other hand, the rotating body 41 has an annular projecting portion 62 projecting upward from the central portion thereof, and the projecting portion 62 enters the inside of the recessed portion 61. By filling the recess 61 into which the protrusion 62 has entered, the upper gas sealing means 32 that is annular and has an inverted U-shaped cross section, like the lower gas sealing means 31. Is formed.

  Further, the coagulation sedimentation processing apparatus 100 is provided with a gas supply means 33 for supplying gas to the lower gas sealing means 31. This gas supply means 33 supplies gas to the lower gas sealing means 31 continuously or intermittently (arrow A1). For example, a gas supply apparatus that pumps a gas such as a compressor, a fan, or a blower. And a gas hose connected to the gas supply device and installed in the sedimentation tank 1. The gas supply device in the gas supply means 33 is disposed outside the settling tank 1, and the gas hose is attached to the bottom plate 21 (fixed member) in the settling tank 1.

  In addition, the coagulation sedimentation processing apparatus 100 is provided with a gas discharge means 34 for discharging excess gas from the lower gas sealing means 31. This gas discharge means 34 discharges surplus gas along the arrows A2 and A3 in FIG. 2, and is connected to the gas inlet 34a opened in the plate-like member 8a and the gas inlet 34a. 41 and a gas hose extending upward in the center well 12. The gas inlet 34 a of the gas discharge means 34 is provided on the inner side of the inner peripheral wall 53 in the plate-like member 8 a.

  The coagulation sedimentation processing apparatus 100 is provided with a gas supply means 35 for supplying gas to the upper gas sealing means 32. This gas supply means 35 supplies gas to the upper gas sealing means 32 continuously or intermittently (arrow A4), and is a gas hose branched from the gas hose of the gas discharge means 34. The distal end portion of the gas supply means 35 is fixed to the protruding portion 62, for example. Thereby, a part of the surplus gas that has flowed into the gas hose of the gas discharge means 34 is supplied to the upper gas sealing means 32, and the remainder of the surplus gas is discharged from the gas hose of the gas discharge means 34 to the outside of the sedimentation tank 1. (Arrow A5).

  In addition, the coagulation sedimentation processing apparatus 100 is provided with a gas discharge means 36 for discharging excess gas from the upper gas sealing means 32. The gas discharge means 36 discharges surplus gas along the arrows A6 and A7 in FIG. 2, and is connected to the gas inlet 36a opened in the outer peripheral wall 64 and the gas inlet 36a. A gas hose extending in the height direction. The gas inlet 36 a of the gas discharge means 36 is located between the front end surface 62 a of the projecting portion 62 and the front end surface 63 a of the inner peripheral wall 63 in the height direction.

  According to such a coagulation sedimentation processing apparatus 100, the lower gas sealing means 31 is provided between the fixed bottom plate 21 and the rotating shaft 8, whereby a sealing member (for example, rubber) that seals by sliding contact is provided. Plate) or the like is not required, and no wear occurs, and the sealing performance between the bottom plate 21 and the shaft 8 does not deteriorate over time. This prevents the sludge in the sludge blanket part 3 from flowing out from between the bottom plate 21 and the shaft 8 to the concentrating part 4 without performing regular maintenance accompanying replacement of the seal part. The lack of sludge can be prevented. Therefore, as a result of the function of the sludge blanket part 3 being sufficiently exhibited, it is possible to suppress a decrease in the clarity of the treated water.

  In the coagulation sedimentation processing apparatus 100, the space between the fixed center well 12 and the rotating rotating body 41 is accommodated in the upper gas sealing means 32 in the same manner as the lower gas sealing means 31. Since it is sealed with gas, there is no deterioration in the sealing performance between the center well 12 and the rotating body 41 over time. This prevents the water to be treated in the flow path 2a from flowing out between the center well 12 and the rotating body 41 into the compartment accommodating the sludge blanket part 3 without performing periodic maintenance accompanying replacement of the seal part. Thus, the flow state of the blanket sludge can be prevented from being disturbed by the outflow. Therefore, as a result of the function of the sludge blanket part 3 being sufficiently exhibited, it is possible to suppress a decrease in the clarity of the treated water.

  Further, since the coagulation sedimentation processing apparatus 100 includes gas supply means 33 and 35 for supplying gas into the gas sealing means 31 and 32, respectively, the gas sealing means 31 and 32 are filled with gas. Therefore, the sealing performance of the gas sealing means 31 and 32 can be improved.

  Moreover, the gas sealing means 31 and 32 are each provided with the recessed parts 51 and 61 provided so that gas might accumulate while being open | released below, and the protrusion parts 52 and 62 which approach into this recessed part 51 and 61, respectively. Therefore, by providing the protrusions 52 and 62 that enter the recesses 51 and 61, the gas-filled means 31 and 32 are filled with the gas, and the region is made into an inverted U-shaped cross section so that the gas leaks. Since it becomes difficult, the sealing performance of the gas sealing means 31 and 32 can be further improved.

  Here, when the gas supplied to the lower gas sealing means 31 by the gas supply means 33 becomes excessive, the outer peripheral wall 54 is longer in the height direction than the inner peripheral wall 53, and therefore the surplus in the recess 51. The gas is not discharged to the outside of the outer peripheral wall 54 beyond the outer peripheral wall 54, is discharged to the inner side of the inner peripheral wall 53 through the inner peripheral wall 53 shorter than the outer peripheral wall 54 in the height direction, and The gas is discharged through the gas discharge means 34. For this reason, it can prevent surplus gas exceeding the outer peripheral wall 54 of the recessed part 51, mixing in the sludge blanket part 3, disturbing the flow state of blanket-like sludge, and suppressing the deterioration of the quality of treated water.

  In addition, when the gas supplied to the upper gas sealing means 32 by the gas supply means 35 becomes excessive, the gas inlet 36a of the gas discharge means 36 is connected to the tip end surface 62a of the protrusion 62 in the height direction. Since it is located between the front end surface 63 a of the inner peripheral wall 63, the excess gas in the recess 61 passes through the inner peripheral wall 63, is inside the inner peripheral wall 63, and exceeds the outer peripheral wall 64. The gas is not discharged to the outside and is discharged from the gas discharge means 36. For this reason, it is possible to prevent excess gas from agitating the water to be treated in the flow path 2 a beyond the inner peripheral wall 63 of the recess 61, and to form a blanket-like sludge in the sludge blanket portion 3. In addition, it is possible to prevent surplus gas from entering the sludge blanket portion 3 beyond the outer peripheral wall 64 of the recess 61 and disturbing the flow state of the blanket-like sludge, and suppressing deterioration of the quality of the treated water.

  Next, another example of the coagulation sedimentation processing apparatus 100 will be described in detail with reference to FIGS. 4-6 is the schematic sectional drawing to which the gas sealing means of the coagulation sedimentation processing apparatus which concerns on the other example of embodiment was expanded. As shown in FIG. 4, the pipe 34b of the gas discharge means 34 which protrudes below rather than the plate-shaped member 8a is provided inside the protrusion part 52 in the lower gas sealing means 31. As shown in FIG. The gas inlet 34a, which is the tip of the pipe 34b, is located between the tip surface 52a of the protrusion 52 and the tip surface 54a of the outer peripheral wall 54 in the height direction. And here, the outer peripheral surface of the shaft in the concentration part 4 is equivalent to the inner peripheral wall 53 in the recessed part 51 of previous embodiment.

  By providing the lower gas sealing means 31 and the gas discharging means 34 as described above, it is possible to prevent a reduction in the treatment efficiency of the water to be treated by the surplus gas supplied by the gas supply means 33 described above. That is, surplus gas in the recess 51 in the lower gas sealing means 31 is not discharged outside the outer peripheral wall 54 beyond the outer peripheral wall 54 but is discharged from the gas discharging means 34. For this reason, it can prevent surplus gas exceeding the outer peripheral wall 54 of the recessed part 51, mixing in the sludge blanket part 3, disturbing the flow state of blanket-like sludge, and suppressing the deterioration of the quality of treated water.

  Moreover, as another example of the coagulation sedimentation processing apparatus 100 different from FIG. 4, in FIG. 5, the gas hose of the gas discharge means 34 extends toward the upper gas sealing means 32 without branching, and the gas supply Connected to means 35. In this case, all of the excess gas that has flowed into the gas hose of the gas discharge means 34 is supplied to the upper gas sealing means 32, and the gas is quickly and sufficiently supplied to the upper gas sealing means 32. Moreover, while having the advantage that the gas hose of the gas discharge means 34 becomes short compared with FIG.2, 3, the stirring of the to-be-processed water which flows through the flow path 2a by presence of this gas hose is suppressed.

  As another example of the coagulation sedimentation processing apparatus 100 different from FIGS. 4 and 5, in FIG. 6, the gas discharge means 36 is provided on the inner peripheral wall 63 that constitutes the recess 61 of the upper gas sealing means 32. Yes. The gas hose of the gas discharge means 36 is accommodated in the treated water inflow portion 2. Even in this case, the above-described effects by the gas sealing means 32 and the gas discharging means 36 on the upper side of the above embodiment are exhibited. In addition, the blanket sludge in the sludge blanket portion 3 can be prevented from being agitated due to the presence of the gas discharge means 36.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the coagulation sedimentation processing apparatus 100 in the above embodiment does not necessarily have to include the upper gas sealing means 32. In this case, the center well 12 and the rotating body 41 may be sealed using an existing sealing member such as a rotary joint, resin (for example, urethane), and packing.

  Further, the gas discharge means 34 according to the above embodiment may be provided on the shaft 8. In this case, for example, one or more gas inlets 34a are provided along the circumferential direction on the outer peripheral surface of the shaft 8 between the bottom plate 21 and the tip end surface 52a of the protruding portion 52 in the height direction, and the interior of the shaft 8 is provided. Excess gas may be discharged through. In this case, the gas discharge means 34 can be easily provided.

  Further, the gas sealing means 31 and 32 according to the above embodiment may not necessarily be supplied with gas continuously or intermittently. For example, the coagulation sedimentation treatment apparatus 100 may be driven after the precipitation tank 1 is filled with water or water to be treated and the gas sealing means 31 and 32 are filled with gas in advance. In this case, the gas supply by the gas supply means 33 is only required first, and the running cost of the gas supply means 33 can be reduced.

  Further, the gas discharge means 36 according to the above embodiment is not necessarily limited as long as the gas inlet port 36a is located between the front end surface 62a of the projecting portion 62 and the front end surface 63a of the inner peripheral wall 63 in the height direction. It is not necessary to be provided on the outer peripheral wall 64. In this case, for example, the distal end portion of the gas discharge means 36 may be a cylindrical member that is attached to the extending member 12 a and protrudes downward in the recess 61.

  Further, the shaft 8 or the rotating body 41 may be attached with a rake for collecting sludge that has settled and aggregated on the bottom plate 21 and facilitates collection of the sludge.

  Moreover, the coagulation sedimentation processing apparatus 100 according to the above embodiment can also be applied to the case where only the rake 42 is provided at the lower end portion of the shaft 8 and the rotating body 41 (distributor) is not provided on the shaft 8.

  DESCRIPTION OF SYMBOLS 1 ... Precipitation tank, 2 ... To-be-processed water inflow part, 2a ... Flow path, 3 ... Sludge blanket part, 4 ... Concentration part, 8 ... Shaft, 11 ... Inflow pipe, 12 ... Center well, 21 ... Bottom plate, 21a ... Opening Part, 22 ... side wall, 31, 32 ... gas sealing means, 33, 35 ... gas supply means, 34, 36 ... gas discharge means, 34a, 36a ... gas inlet, 41 ... rotating body, 51, 61 ... recess, 52, 62 ... projecting portion, 52a, 54a, 62a, 63a ... tip surface, 53, 63 ... inner peripheral wall, 54, 64 ... outer peripheral wall, 100 ... coagulation sedimentation treatment apparatus, A1-A7 ... arrow.

Claims (7)

A sludge blanket type coagulation sedimentation treatment device,
A sludge is formed in a blanket shape, and a sludge blanket section that captures flocks in the treated water;
A concentrating part provided under the sludge blanket part and where the sludge is concentrated;
A bottom plate for partitioning into the sludge blanket part and the concentration part;
A shaft that passes through the bottom plate and is rotatably provided;
Gas sealing means for preventing the sludge in the sludge blanket part from flowing out to the concentrating part from between the bottom plate and the shaft;
A coagulation sedimentation processing apparatus comprising: A flow path through which the water to be treated flows, and a center well for dividing sludge for capturing the floc in the water to be treated into a sludge blanket portion formed in a blanket shape;
A rotating body that is rotatably provided below the center well, and causes the water to be treated supplied from the flow path to flow into a compartment in which the sludge blanket portion is accommodated;
Gas sealing means for preventing the treated water in the flow path from flowing out into the compartment from between the center well and the rotating body,
A coagulation sedimentation processing apparatus comprising:   The coagulation sedimentation processing apparatus according to claim 1, further comprising gas supply means for supplying gas into the gas sealing means.   4. The coagulation sedimentation processing apparatus according to claim 3, wherein the gas sealing means includes a concave portion that is opened downward and collects gas, and a protruding portion that enters the concave portion. . The concave portion includes an inner peripheral wall and an outer peripheral wall forming the concave portion,
The outer peripheral wall is longer in the height direction than the inner peripheral wall,
The coagulation sedimentation processing apparatus according to claim 4, further comprising gas discharge means provided inside the inner peripheral wall for discharging excess gas in the recess. The concave portion includes an inner peripheral wall and an outer peripheral wall forming the concave portion,
The inner peripheral wall is longer in the height direction than the outer peripheral wall,
Furthermore, provided with a gas discharge means provided between the inner peripheral wall and the outer peripheral wall for discharging excess gas in the recess,
The coagulation sedimentation processing apparatus according to claim 4, wherein the gas inflow port of the gas discharge means is located between the front end surface of the protrusion and the front end surface of the outer peripheral wall in the height direction. The concave portion includes an inner peripheral wall and an outer peripheral wall forming the concave portion,
The outer peripheral wall is longer in the height direction than the inner peripheral wall,
Furthermore, it comprises a gas discharge means for discharging excess gas in the recess,
The coagulation sedimentation processing apparatus according to claim 4, wherein the gas inlet of the gas discharge means is located between a tip surface of the projecting portion and a tip surface of the inner peripheral wall in the height direction.

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