JP2001293305A - Flocculation/precipitation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precipitation separator of a simple structure which can precipitate/separate sludge efficiently and purify drainage. SOLUTION: A flocculation/precipitation tank 9 is divided into an agitation/ mixing part 91 having a flocculant charging means for charging a flocculant directly and an agitation means for agitating/mixing the charged flocculant and introduced treatment water and a precipitation/separation part 92 for precipitating/separating flocculated sludge by a partition 93 with the lower part sides communicating with each other, and the cross-sectional area of the part 92 is formed to be larger than that of the part 91. A partition 94 which is immersed in water with the upper and lower parts communicating with each other is provided in the part 91, the agitation blade 131 of the agitation means and the inlet of the flocculant charging means are formed on the treatment water inflow side seen from the partition 94, and a communication port 96 with the part 92 is formed in the lower part on the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coagulating sedimentation apparatus, and more particularly to a coagulating sedimentation apparatus capable of performing a suitable treatment for use in a general household disposer wastewater treatment system.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 11-192493 (C0
2F 1/52), a treatment tank in which a stirring tank and a sedimentation tank are integrally formed, a partition plate that divides the stirring tank into a plurality and partially communicates, and each of the chambers divided by the partition plate. A stirrer installed for each of the chambers, a flocculant charging section provided above one of the chambers, a partition plate that divides the sedimentation tank into a plurality and communicates a part thereof, and is divided by the partition plate. There is disclosed a turbid water treatment apparatus including a drainage unit provided in one of the chambers and a flowing water unit for transferring floc-containing water from one chamber of a stirring tank to one chamber of a sedimentation tank.
The processing tank has a half as a stirring tank and the other half as a sedimentation tank.

[0003] In general, a coagulant is generally diluted once in a dissolving tank or the like and then charged, or a fast and slow stirring tank is used in order to easily cause a coagulation reaction.

[0004]

In the apparatus disclosed in the above publication, the stirring tank and the sedimentation tank are each divided into a plurality of parts, and each of the divided chambers is provided with a stirrer in each of the plurality of divided chambers. It is not suitable for general household disposer wastewater treatment systems, etc.

[0005] In addition, the coagulant may be diluted once in a dissolving tank and then charged, or those using a rapid and slow stirring tank may be used.
After all, the deterioration of the coagulant, the increase in size, and the increase in cost are caused, so that it is not suitable for a general household disposer wastewater treatment system.

Accordingly, the present invention has been made to solve such a problem, and provides a sedimentation / separation apparatus capable of efficiently performing sludge sedimentation / separation with a simple structure and purifying discharged water. It is intended to do so.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a coagulating sedimentation tank, comprising: a coagulant charging means for directly charging a flocculant; A stirring / mixing unit provided with a stirring means for stirring and mixing water, and a sedimentation / separation unit for sedimentation / separation of aggregated sludge, are partitioned by a partition having a lower side communicating therewith, and the cross-sectional area of the sedimentation / separation unit is set to the stirring / mixing unit. Is formed so as to be larger than the cross-sectional area.

Further, the stirring and mixing section is provided with a partition which is submerged in water and communicates vertically, and a stirring blade of the stirring means and an input port of the coagulant charging means are provided on the inflow side of the water to be treated as viewed from the partition. And a communication port with the sedimentation / separation part is formed in the lower part on the opposite side.

Further, the rotation direction of the stirring blade is set so that the stirring water flow by the stirring means flows upward at the position of the stirring blade.

[0010] Further, the sedimentation separation section is provided with a flow straightening plate which is arranged at an interval from a communication port with the stirring and mixing section and is inclined upward toward an opposing side wall. It is.

[0011] Further, the present invention is characterized in that a shaft for preventing shaft runout is provided on a shaft for mounting the stirring blade in the stirring unit.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of a wastewater treatment section in a disposer wastewater treatment system to which a coagulation sedimentation device according to the present invention is applied, (a) is a top view,
(B) is a side sectional view.

The wastewater treatment section 1 of the present embodiment includes a flow passage switching device 2 for switching a flow passage of wastewater flowing from a disposer (not shown), and a normal kitchen wastewater except when the disposer is used via the flow passage switching device 2. The garbage crushed liquid at the time of using the disposer flows in through the miscellaneous drainage flow rate adjusting tank 3 and the flow path switching device 2, and sludge is returned from the coagulating sedimentation tank 9 described below by the air lift pump 11. The flow rate adjusting tank 4, a solid-liquid separating device 6 for separating a solid-liquid mixture transferred from the garbage flow adjusting tank 4 by an air lift pump 5 into a solid component and a liquid component, and the solid-liquid separating device 6 Kitchen drainage, which is supplied with liquid and is transferred from the wastewater flow control tank 3 by the air lift pump 7, and an overflow port 3 formed in the wastewater flow control tank 3 as well. A carrier fluidizing tank (aeration tank) 8 into which kitchen wastewater flows from, a coagulating sedimentation tank 9 for aggregating and separating sediment of sludge in the water to be treated which flows in by gravity from the carrier fluidizing tank 8, And a composting device 10 in which the solid component separated and introduced by the separating device 6 and the stored microbial carrier are agitated and mixed by a stirrer and composted (composted) by microorganisms inhabiting the carrier. .

The air lift pump is a pump that blows air into a pipe inserted into water, lifts and transfers water and solids by the rising force of the air, and includes an air lift pipe and a blower pump. And the blower pump can be shared by switching using a multi-way valve or the like.

In the above system, after the use of the disposer is completed, the settled sludge in the coagulation sedimentation tank 9 is returned to the garbage flow rate adjustment tank 4 into which the garbage crushed liquid has been introduced by the air lift pump 11. Thereafter, after a certain period of time for sedimentation has elapsed, the sediment (crushed garbage and returned sludge) in the garbage flow control tank 4 is transferred to the solid-liquid separation device 6 by the air lift pump 5 and then coagulated. The settled sludge in the settling tank 9 is returned to the garbage flow rate adjusting tank 4 by the air lift pump 11, and the kitchen wastewater in the miscellaneous wastewater flow rate adjusting tank 3 is transferred to the carrier flowing tank 8 by the air lift pump 7, and these are used in the next disposer. Repeat at fixed intervals until there is a quantity.

As described above, the transfer of the kitchen drainage in the gray water flow control tank 3 and the sediment in the raw garbage flow control tank 4 are performed at regular intervals by a fixed amount, and the transfer from the gray water flow control tank 3 to the carrier flow tank 8 is performed. By providing the overflow port 31 of the above, it is possible to cope with a normal disposer use or kitchen drainage without overflowing even in the small volume miscellaneous drainage flow rate adjusting tank 3 and the garbage flow rate adjusting tank 4, and as described later. The coagulation sedimentation tank 9 realized with a simple structure enables the entire system to be reduced in size and cost for general household use.

FIG. 2 is a perspective view showing the structure and operation of the coagulation / sedimentation tank 9 according to this embodiment, and FIG. 3 is a side sectional view.

As shown in FIG. 3, the coagulating sedimentation tank 9 of the present embodiment includes a coagulant charging device 12 for directly charging the coagulant in a concentrated state, and a stirring and mixing of the supplied coagulant and the inflowing water to be treated. A stirring and mixing section 91 provided with a stirring device 13 for performing
The lower part is partitioned by a partition wall 93 communicating with a sedimentation / separation part 92 that sediments and separates the flocculated sludge. The partition 93
Is formed at a position such that the cross-sectional area of the sedimentation / separation section 92 is larger than the cross-sectional area of the stirring / mixing section 91.

Further, the stirring and mixing section 91 is provided with a partition wall 94 which is submerged in water and communicates with the upper and lower sides.
A stirring blade 131 of the stirring device 13 and a charging port 121 of the flocculant charging device 12 are provided in an upper portion on the side, and a communication port 96 with the sedimentation / separation section 92 is formed in a lower portion on the opposite side.

The rotation direction of the stirring device 13 is set so that the stirring water flow a generated by the rotation of the stirring blade 131 driven by the stirring motor 132 flows upward at the position of the stirring blade 131. That is, this stirring water flow a
As shown by an arrow, a circulating water flow rises from the stirring blade 131 toward the water surface, turns to the opposite side of the partition 94, and returns from the lower part of the partition 94 to the stirring blade 131.

The stirring device 13 includes a stirring blade 13
Since the first mounting shaft 133 has a cantilever structure, shaft runout is likely to occur, and when the user is absent on a trip or the like, there is no long-term inflow of wastewater, and the water level of the coagulating sedimentation tank 9 is lowered due to evaporation or the like, and stirring is performed. When the blade 131 appears on the water surface and rotates at a high speed in a no-load state, vibration (roughness) due to the shaft runout of the stirring blade 131 occurs, and the stirring blade 131 may hit the side wall and be damaged.

Therefore, in the present embodiment, the lower side of the motor holder 134 holding the stirring motor 132 is extended downward, and the mounting shaft 133 of the stirring blade 131 is supported at two places spaced apart at the upper and lower ends. Bearings 135, 13
5 is provided to prevent the shaft 133 of the stirring blade 131 from swinging. This is achieved by molding the motor holder 134 having the above-mentioned shape with resin, forming a hole through which the mounting shaft 133 of the stirring blade 131 passes, and fixing a bearing 135 such as a metal bearing at upper and lower ends thereof. Can be easily achieved.

On the other hand, an air lift pipe 111 for returning sludge and air supplied from a blower pump (not shown) are supplied to the sedimentation / separation section 92 along a partition wall 93 with the stirring / mixing section 91 and a lower portion of the air lift pipe 111. Air pipe 112 for
Is inserted, and one side of the tank bottom has an inclined surface 97 so that sedimentation sludge accumulates on the lower side of the air lift pipe 111. In addition, a discharge port 98 for discharging the supernatant water to a sewer or the like is formed at an upper portion of the sedimentation / separation unit 92.

In the present embodiment, the stirring and mixing section 91
A flow rectifying plate 99 is mounted at a distance from the communication port 96 with the air lift pipe 111 and is inclined upward and substantially parallel to the inclined surface 97 of the tank bottom toward the opposing side wall. Notch 99 where trachea 112 passes
a is formed. The current plate 99 is provided in the stirring and mixing section 9.
It functions to suppress the rise of the stirred water flow b generated on the sedimentation / separation section 92 side through the communication port 96 due to the stirred water flow a circulating in 1.

In the above-described configuration, the water to be treated that has flowed in from the carrier fluidizing tank 8 through the inlet 95 is added with the concentrated coagulant supplied from the coagulant charging device 12 and the stirring blade 131 And stirred.

In this embodiment, the stirring and mixing section 91 is provided with a partition wall 94 communicating vertically, and a stirring water stream a circulating above and below the partition wall 94 is generated. The particles are dispersed when passing through the stirring blade 131 on the circulating stirring water flow a, and can be efficiently mixed with the water to be treated.

As described above, with a simple structure, the directly supplied concentrated coagulant and the inflowing water to be treated can be efficiently stirred and mixed. The coagulation reaction is promoted without using a slow stirring tank and the reactivity between the coagulant and the sludge is improved, whereby the sedimentation of the sludge can be improved.

A communication port 96 is provided below the partition wall 93 for partitioning the stirring / mixing section 91 and the sedimentation / separation section 92, and the water to be treated containing the agitation-mixed and agglomerated sludge passes through the communication port 96. The sediment moves to the sedimentation / separation unit 92 through the sediment, and the sludge is sedimented and separated.

At this time, since the cross-sectional area of the sedimentation / separation section 92 is larger than that of the stirring / mixing section 91, the rising speed of the water to be treated is reduced, so that the coagulated sludge can be more efficiently formed with a simple structure. Can be separated.

Also, the stirring blades 1 such that the stirring water flow a by the stirring device 13 flows upward at the position of the stirring blades 131.
By setting the rotation direction of 31, the stirring blade 131
Does not flow directly to the communication port 96 to the sedimentation / separation unit 92 formed on the lower side, so that disturbance of the sedimentation / separation unit 96 can be minimized and the stirring / mixing unit 9 can be used.
In this way, it is possible to prevent a problem in which suspended sludge adheres to the draft portion of the stirring and mixing section 91 and grows to obstruct the water surface.

Further, when the stirring blade 131 rotates, a stirring water stream b is generated in the sedimentation / separation section 92 along with the stirring water stream a in the stirring / mixing section 91 as shown by an arrow in FIG. Since the flow straightening plate 99 is provided so as to be inclined so as to suppress the rise, it is possible to prevent the sludge from rising on the water flow.

Therefore, with a simple structure, it is possible to prevent the supernatant water of the sedimentation / separation section 92 from being contaminated, and to discharge the purified discharged water (supernatant water) from the discharge port 98 to the sewer. .

The above-mentioned coagulation and sedimentation apparatus according to the present invention can efficiently perform sedimentation and separation of sludge with a simple structure, so that a general household disposer wastewater treatment system that requires miniaturization and cost reduction. The present invention is particularly effective when applied to other types of water treatment systems.

[0035]

As described above, according to the present invention, the coagulation sedimentation tank is provided with the coagulant charging means for directly charging the flocculant and the stirring means for stirring and mixing the charged flocculant and the inflowing water to be treated. The stirring and mixing section and the sedimentation and separation section for sedimenting and separating the agglomerated sludge are separated by a partition wall connected to the lower side, and the cross-sectional area of the sedimentation and separation section is formed to be larger than the cross-sectional area of the stirring and mixing section. Aggregation reaction can be promoted by stirring and mixing the supplied coagulant and the inflowing water to be treated, and the rising speed of the water to be treated containing coagulated sludge decreases in the sedimentation separation section with a large cross-sectional area. Therefore, the sedimentation and separation of sludge can be efficiently performed with a simple structure, and the discharged water can be purified, so that a coagulation sedimentation apparatus suitable for use in a general household disposer wastewater treatment system or the like can be obtained.

Further, the stirring and mixing section is provided with a partition wall which is submerged and vertically communicates, and a stirring blade of the stirring means and an input port of the flocculant charging means are provided on the inflow side of the water to be treated as viewed from the partition wall. Since a communication port with the sedimentation separation section is formed in the lower part on the opposite side, a circulating water flow passing through the stirring blade is generated at the time of stirring, so that the coagulant that has flowed in directly with the coagulant that has been introduced. Since the treated water can be efficiently stirred and mixed, the flocculation reaction is promoted without the need to dilute the flocculant once and then throw it in, or use a rapid and slow stirring tank, and the reactivity between the flocculant and sludge is promoted. By improving
The sedimentation of sludge can be improved.

Further, by setting the rotation direction of the stirring blade so that the stirring water flow by the stirring means flows upward at the position of the stirring blade, the water flow from the stirring blade flows to the sedimentation / separation section formed on the lower side. Since it does not flow directly to the communication port,
Disturbance of the sedimentation and separation section can be minimized, and there is a problem that the suspended sludge adheres to the draft portion of the stirring and mixing section and grows, blocking the water surface by raising the water surface of the stirring and mixing section. Can be prevented.

Further, the sedimentation / separation unit is provided with a rectifying plate which is arranged at an interval from a communication port with the stirring / mixing unit and is inclined upward toward the opposing side wall, so that stirring at the time of stirring is performed. Since the rise of the agitated water flow generated in the sedimentation / separation unit due to the agitation water flow in the mixing unit can be suppressed by the straightening plate, it is possible to prevent the supernatant water discharged from the sedimentation / separation unit from being mixed with the sludge and contaminated.

Further, the shaft of the agitating means in the agitating means is provided with the shaft runout preventing means for preventing the shaft runout, so that the water to be treated does not flow for a long time and the water level of the coagulation sedimentation tank is lowered by evaporation or the like. Even in a case where the stirring blade appears on the water surface and rotates at a high speed with no load, vibration (runaway) due to shaft runout of the stirring blade can be prevented, so that damage to the stirring blade can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a wastewater treatment section in a disposer wastewater treatment system to which a coagulation sedimentation device according to the present invention is applied, (a) is a top view, and (b) is a side sectional view.

FIG. 2 is a perspective view of the coagulation sedimentation tank in the embodiment.

FIG. 3 is a side sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage processing part 2 Flow-path switching device 3 Miscellaneous wastewater flow control tank 4 Garbage flow control tank 5, 7, 11 Air lift pump 6 Solid-liquid separation device 8 Carrier flow tank 9 Coagulation sedimentation tank 10 Composting device 12 Coagulant injection device Reference Signs List 13 Stirring device 91 Stirring / mixing section 92 Precipitation / separation section 93, 94 Partition wall 95 Inlet 96 Communication port 97 Inclined surface 98 Discharge port 99 Rectifier plate 111 Sludge return air lift pipe 112 Air supply pipe 121 Coagulant inlet 131 Stirring blade 132 Stirring motor 133 Mounting shaft 134 Motor holder 135 Bearing

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 1/52 C02F 1/52 E (72) Inventor Keiichi Fujimoto 2-5 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Kozo Akamatsu 2-5-5, Keihanhondori, Moriguchi-shi, Osaka Prefecture In-house Sanyo Electric Co., Ltd. (72) Isao Yoneda 2, Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Hiroyuki Takami 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 4D015 BA19 BA29 BB05 CA01 DC02 EA02 EA06 EA32 4D062 BA19 BA29 BB05 CA01 DC02 EA02 EA06 EA32

Claims (5)

[Claims] An agitation and mixing section provided with an aggregating agent introducing means for directly introducing an aggregating agent and an agitating means for agitating and mixing the introduced aggregating agent and the inflowing water to be treated. A coagulating sedimentation apparatus, wherein a partitioning section is provided with a lower part communicating with a sedimentation separation part for sedimentation separation, and a cross-sectional area of the sedimentation separation part is formed larger than a cross-sectional area of the stirring and mixing part. 2. The stirring and mixing section is provided with a partition which is submerged and vertically communicates, and a stirring blade of the stirring means and an input port of the coagulant input means are provided on an inflow side of the water to be treated as viewed from the partition. 2. The coagulating sedimentation apparatus according to claim 1, wherein a communication port with the sedimentation separation part is formed in a lower part on the opposite side. 3. The coagulating sedimentation apparatus according to claim 1, wherein the rotation direction of the stirring blade is set so that the stirring water flow by the stirring means flows upward at the position of the stirring blade. 4. The rectifying plate provided in the sedimentation / separation unit and spaced from the communication port with the stirring / mixing unit and inclined upward toward the opposing side wall. The coagulation sedimentation apparatus according to any one of claims 1 to 3. 5. The coagulating sedimentation apparatus according to claim 1, wherein the stirring shaft of the stirring means is provided with a shaft run-out preventing means for preventing shaft run-out.