JPH08112505A - Inclined settling device - Google Patents

Abstract

PURPOSE: To lessen the influence that the change in the water temp. of water to be treated exerts on the quality of treated water and to prevent a flow passage from being clogged by suspended matter. CONSTITUTION: This downflow inclined settling device 16 is used as, for example, a part of a flocculating and settling device 10. A treating vessel 14 adjacent to a stirring vessel 12 is divided by a partition wall 34 to a settling vessel 36 and a reserving vessel 38. Both of the settling vessel and the reserving vessel communicate with each other via the lower opening of the partition wall. The inclined settling device is installed at the settling vessel and is provided with a flow passage former 40 and a distributing pipe 42. This flow passage former is provided with inclined flow passages over the entire part of the settling vessel in the position of the prescribed height from the bottom of the settling vessel and is composed of an assembly of corrugated forming plates or moldings. The suspended matter is settled and separated in the process that the water to be treated passes through the distributing pipe from the stirring vessel and flows downward from above in the flow passage former.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inclined settling apparatus for cleaning a liquid to be treated by causing a suspension in the liquid to be treated to settle. Coagulation sedimentation device used for water purification that supplies water, coagulation sedimentation device used for water treatment of general industrial water, and coagulation sedimentation device used for wastewater treatment of general industrial wastewater, etc. The present invention relates to a sedimentation device provided with a sedimentation device.

[0002]

2. Description of the Related Art Coagulation sedimentation treatment is a clarification treatment of water that is widely adopted in various water treatment apparatuses, and a coagulation reaction is performed by adding a coagulant to water to be treated. This is a process in which floating suspended matter is formed into flocs capable of settling and separating, and then flocs are settling and separating to obtain clear treated water from suspended treated water. In order to efficiently settle and separate coagulated flocs from the water to be treated, it is necessary for the water to be treated to flow in a turbulent and uniform laminar flow state without disturbance. For that purpose, various settling devices are used, but the inclined settling device is one type of settling device that is widely used in coagulating settling devices, and the flow of the water to be treated is in a uniform laminar flow state. The volumetric efficiency can be improved by rectifying the suspension to facilitate the sedimentation of the suspension and increase the sedimentation area per unit volume of the apparatus.

By the way, the inclined settling device which has been put to practical use or proposed has been a horizontal flow inclined settling device for flowing the water to be treated horizontally, or an upward flow of the treated water from bottom to top. Either of the countercurrent inclined settling devices. The horizontal flow inclined settling device is provided with a large number of inclined settling guide plates F in a processing tank (not shown), as shown in FIG. 7A, for example.
Are installed in parallel to each other and the water to be treated is allowed to flow horizontally between the settling guide plates F. The water to be treated flows in from the front part of the treatment tank, flows horizontally, and flows out from the rear part. Upflow inclined settling device is a processing tank (not shown)
For example, as shown in FIG. 7 (b), a molded body G molded so as to have a number of honeycomb-shaped hollow portions is installed in an inclined manner, and each hollow portion of the molded body is moved from the bottom to the top. The water to be treated is made to flow upward. The water to be treated flows in from the lower part of the front part of the treatment tank, flows upward, and flows out from the upper part of the rear part.

[0004]

However, in the conventional inclined settling apparatus, the settling separation performance thereof is significantly affected by the change in the temperature of the inflowing treated water, so that the settling separation of the suspended flocs or the like is performed. However, there was a problem that the quality of treated water deteriorated due to incompleteness. The influence of the water temperature change of the treated water on the water quality is particularly large when the temperature of the treated water rises. For example, even if the water temperature rises by 0.5 ° C per hour, the water quality of the treated water often deteriorates. It was on the other hand,
When the water temperature drops, the effect is relatively small. One of the methods is to heat or cool the inflowing treated water to strictly control the water temperature of the treated water to prevent deterioration of the quality of the treated water due to fluctuations in water temperature. Considering cost, this method is not economically viable and impractical. In particular, in a device for treating a large amount of water, for example, a clean water or industrial water supply device such as a water purification plant, it is practically impossible to adjust the temperature of the water to be treated by heating and cooling.

Further, in the conventional inclined settling apparatus, particularly in the upward flow inclined settling apparatus, there is a strong tendency for sedimented flocculation flocs to accumulate and block the flow path, and the settling guide plate and the molded body forming the flow path are washed. Was often required, and there was a problem that the work efficiency of the inclined settling device was poor.

In view of the above situation, the object of the present invention is to
It is an object of the present invention to provide an inclined settling device in which a change in the water temperature of the water to be treated has little influence on the settling separation performance of the device, and the flow path is not blocked by the sedimented suspension.

[0007]

The present inventor has studied the sedimentation separation mechanism of an inclined settling apparatus and analyzed the problems of the conventional inclined settling apparatus as follows. Since the density of water changes depending on the water temperature, when the water temperature of the inflowing treated water changes in the conventional inclined settling device, the water temperature distribution in the treatment tank containing the inclined settling device becomes uneven, and Occurs and stays in a part of the processing tank. Therefore, the flow passage area of the water in the treatment tank is reduced, and a nonuniform flow occurs in the inclined settling device, which hinders the function of the inclined settling device.

For example, in a horizontal flow gradient settler, when the temperature of the inflowing treated water rises, the density of the inflowing treated water is larger than that of the inflowing treated water, so that the horizontal flow inclination It gradually descends to the inner bottom of the treatment tank accommodating the settling device, and as shown in FIG. 8A, it becomes a lump of cold water having a high density and stays at the inner bottom of the treatment tank. Therefore, the same result as when the flow path of the water in the treatment tank is partially blocked is obtained, and the water to be treated that has flowed in later passes near the water surface of the inclined settling device at a high flow velocity in a non-uniform flow state. Therefore, the sedimentation time for sedimenting the suspension in the water to be treated becomes short, and sedimentation separation becomes incomplete.

The same applies to the upflow tilting device,
When the water temperature of the inflowing treated water rises, the inflowing treated water gradually descends to the middle bottom of the treatment tank accommodating the upflow inclined settling apparatus, as shown in FIG. As shown in (b), cold water lumps having a high density are accumulated in the middle bottom of the processing tank. Therefore, the water to be treated that has flowed into the bottom of the treatment tank rises by short-circuiting the inlet without advancing to the middle part and the second half of the inclined settling device, resulting in a decrease in the flow area of the water to be treated. Higher water flow rates result in shorter settling times and incomplete settling separation.

The inventor of the present invention, in order to prevent the deterioration of the quality of the treated water due to the change in the temperature of the water to be treated, prevent the water temperature distribution in the treatment tank from becoming non-uniform, especially in the treatment tank. It was thought that it was to prevent lumps from occurring, and in contrast to the common sense in the water treatment field, the present invention was completed by focusing on a downward flow inclined settling device which is completely different from the conventional technical idea.

Based on the above findings, in order to achieve the above-mentioned object, the downward flow inclined settling apparatus according to the present invention has a plurality of cylindrical bodies adjacent to each other so as to form a flow path inside. A flow channel forming body made of a shaped body or a flow channel forming body made of a plurality of plate-shaped members arranged so as to form a flow channel between opposing plate-shaped members is used. It is characterized in that the suspension in the liquid to be treated is settled while guiding the liquid to be treated so as to flow from the upper side to the lower side in the flow path.

The cross-sectional shape of the flow path of the molded body used as the flow path forming body in the present invention is not limited to polygonal or circular shape, and may be any shape, and its cross-sectional area may change along the flow path. good. Similarly, the cross-sectional shape of the plate member is not limited, and may be a flat plate or a corrugated plate, and the corrugated shape may be any shape. Furthermore, the flow passage area of the flow passage formed between the plate-shaped members may also change along the flow passage. The inclination angle of the flow channel is not particularly limited, but it is preferable that it is inclined about 60 ° with respect to the horizontal plane based on an empirical rule.

The liquid to be treated in the present invention is not particularly limited in its properties, and the aggregating agent may not necessarily be added. In order to allow the liquid to be processed to flow from the top to the bottom along the flow path, for example, a distribution pipe for the liquid to be processed is arranged above the flow path forming body, and the liquid to be processed is allowed to flow down from there. After passing through the passage forming body, the lower part of the processing tank is sent to the next processing step.

Another inclined settling apparatus according to the present invention comprises a plurality of inclined settling apparatuses arranged in series so that the liquid to be treated is sequentially flowed, and at least one inclined settling apparatus is a downward flow inclined settling apparatus. The remaining inclined settling apparatus is a composite type inclined settling apparatus characterized in that it is an upward flow inclined settling apparatus in which the liquid to be treated is made to flow from bottom to top along the flow path.

The downward flow inclined settling device and the upward flow inclined settling device may be arranged in either a downward flow or an upward flow, preferably a downward flow inclined settling device. It is better to carry out sedimentation separation by. The first reason is that, in the downward flow inclined settling device, the sludge sludge sliding direction from the flow path forming body is the same as the flow direction of the water to be treated, and thus the settled sludge easily falls. Therefore, it is preferable to settle most of the suspended matter first with a downward flow inclined settling device that facilitates sludge discharge. Secondly, the uneven flow due to the density flow is likely to occur in the process of increasing the water temperature. Therefore, it is better to install the down-flow inclined settling device which is not easily affected by the sedimentation separation performance even when the water temperature rises. Good removal rate of suspended matter. This is because when the water temperature decreases, the temperature is likely to be uniform due to convection, and sedimentation separation failure due to the occurrence of uneven flow is unlikely to occur.

[0016]

In the inclined settling apparatus according to the first aspect of the present invention, since the water to be treated flows from the top to the bottom, even if the temperature of the water to be treated changes, the cold water mass produced in the conventional inclined settling apparatus. Does not occur, and therefore, a non-uniform flow does not occur, the sedimentation separation performance is maintained, and the water quality of the treated water does not deteriorate. Also,
The flow direction of the suspended sedimentation device drops due to its own weight and the flow direction of the water flow is the same, so the sludge is discharged smoothly from the flow path, and due to excessive accumulation and abnormal drainage. The flow path is not blocked.

Further, to explain, even if the temperature of the water to be treated rises and the density of the water to be treated becomes smaller than the density of the water to be treated that has flowed in earlier, the water is extruded from the top to the bottom due to the difference in height. Since the force is large, the water to be treated flows downward in the flow channel in an extruded form. Therefore, cold water lumps, and hence, non-uniform flow, do not occur in the treatment tank, so that the sedimentation separation performance of the inclined sedimentation apparatus does not deteriorate. Further, when the temperature of the treated water decreases, the density of the treated water that flows in later becomes higher than the density of the treated water that flows in first, and the downward flow of the treated water is promoted, and the downward flow is the treatment tank. The treated water with a low density at the bottom of the is pushed out from the lower part of the treatment tank. In addition, the treated water that has descended pushes up the treated water that has flowed in earlier and has a low density,
It creates a circulating mixed flow, so heat exchange occurs between them,
The change in water temperature is made uniform, and no cold water mass that causes uneven flow is generated.

In the combined gradient settling apparatus according to the second aspect of the present invention, even when the water temperature sharply drops, a uniform upward flow is maintained in the upward flow inclined settling apparatus, and good sedimentation is performed. Therefore, the quality of treated water can be maintained. Since the down-flow inclined settling device is installed in the previous stage, the sedimentation load of suspended matter in the up-flow inclined settling device, which is relatively difficult to remove sludge, is reduced and smooth operation is performed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings. Example 1 FIG. 1 is a schematic vertical cross-sectional view showing the configuration of Example 1 of a coagulating sedimentation apparatus equipped with a downward flow inclined sedimentation apparatus according to the present invention. The coagulation-sedimentation apparatus 10 of the present embodiment introduces a coagulant into treated water to generate coagulated flocs, and then sediments and separates the coagulated flocs to remove clean treated water from the treated water, for example, clean water from raw water. A device for obtaining a rectangular box type stirring tank 1
2 and a rectangular box type processing tank 1 adjacent to the stirring tank 12
4, a downward flow inclined settling device (hereinafter simply referred to as an inclined settling device) 16 provided in the treatment tank 14, and a sludge discharging device 18.

The stirring tank 12 comprises a coagulation / mixing tank 20 and a partition wall 2.
The slow mixing tank 22 and the slow mixing tank 22 are separated from each other and are adjacent to each other. The coagulation and mixing tank 20 and the slow mixing tank 22 communicate with each other through a lower opening of the partition wall 24. In addition, the aggregating and mixing tank 20
Is provided with a rapid stirrer 26, and the slow stirring tank 22 is provided with a slow stirrer 28. The slow stirring tank 22 is a tank wall 23
It is adjacent to the processing tank 14 by being separated by. Processing tank 1
4 is a settling tank 36 adjacent to the slow stirring tank 22 and a reservoir tank 3
8 is divided by a partition wall 34, and both the settling tank 36 and the reservoir tank 38 communicate with each other through the lower opening of the partition wall 34. The treated water inflow port 30 is provided on the tank wall facing the partition wall 24 of the coagulation and mixing tank 20, and the treated water outflow port 3 is provided.
2 is provided on the tank wall facing the partition wall 34 of the reservoir tank 38, and the height of the outlet 32 defines the position of the water surface of the coagulation-sedimentation apparatus 10.

The inclined settling device 16 is provided in the settling tank 36, and is provided with a flow path forming body 40 and a tubular distribution pipe 42. The flow path forming body 40 is provided at a predetermined height from the bottom of the settling tank 36, and extends over the entire surface of the settling tank 36 from the tank wall 23 to the partition wall 34. The flow path forming body 40 is formed by an aggregate of a plurality of trapezoidal shaped corrugated plates 40a having a trapezoidal cross section as shown in FIG. The hollow body is formed of a molded body 40b formed in a honeycomb shape as shown in FIG. Figure 2
A large number of flat plates may be arranged instead of the corrugated plate 40a shown in FIG. The flow path forming body 40 is arranged so that the flow path is inclined downward by about 60 ° with respect to the horizontal plane. In the present embodiment, the flow passage forming body 40 is arranged so that the flow passage is inclined downward from the upper left to the lower right in the drawing, but in the opposite direction, the flow passage is formed from the upper right to the lower left. You may arrange | position so that it may become a downward slope.

The distribution pipe 42 is provided at one end with the slow stirring tank 2
It is formed by a pipe that communicates with 2, and is closed at the other end, is located above the flow path forming body 40, and extends from the tank wall 23 toward the partition wall 34 at the center of the settling tank 36. Further, a large number of pores 44 are provided on both sides of the pipe at substantially equal intervals in the longitudinal direction.

The mud discharge device 18 has a conventional structure and is provided with a sludge hopper 46 formed so as to incline from four sides toward the lowest portion, and an on-off valve provided at the lowest portion of the sludge hopper 46. A sludge discharge pipe 48 and a sludge discharge hopper 46 are provided at several locations on the bottom plate of the processing tank 14.

The function of each device constituting the coagulating sedimentation device 10 of this embodiment will be described below. The water to be treated has an inlet 3
From 0, it flows into the coagulation / mixing tank 20, where the coagulant is charged, and then the mixture is agitated and mixed by the rapid agitator 26. Next, the water to be treated flows into the slow-speed stirring tank 22 through the lower opening of the partition wall 24, where it undergoes a flocculation reaction while being gently stirred by the slow-speed stirrer 28 to generate floc flocs. The water to be treated in which the flocs of flocculation are suspended flows from the slow stirring tank 22 into the downward flow inclined settling device 16 for treatment. First, the water to be treated flows into the distribution pipe 42, further enters the flow channel forming body 40 through the pores 44, and passes through the flow channel forming body 40 in a downward flow to settle the floc. The purified treated water enters the reservoir tank 38 through the lower opening of the partition wall 34, and then flows out from the outlet 32.

Agglomerated flocs in the water to be treated settle down and adhere to the wall surface of the flow passage forming body 40 while the water to be treated passes through the flow passage forming body 40 of the inclined settling device 16. When the amount of water increases, the wall surface slides down due to the synergistic effect of its own weight and the pushing force of the water to be treated, and it accumulates in the sludge discharge hopper 46 at the bottom of the sedimentation tank 38 as coagulated sediment sludge. The sludge stored in the sludge hopper 46 is taken out of the tank by opening the sludge pipe 48 at any time. The sludge settled in the storage tank 38 is also deposited on the sludge hopper 46 at the bottom of the storage tank 38, and is similarly discharged.

Embodiment 2 FIG. 3 is a schematic longitudinal sectional view showing the structure of a coagulating sedimentation apparatus equipped with a composite type inclined sedimentation apparatus according to the present invention. Of the devices and parts shown in FIG. 3, those having the same functions as those shown in FIG. 1 are designated by the same reference numerals, and their description will be omitted. Similar to the first embodiment, the flocculation-sedimentation apparatus 50 of the present embodiment introduces a flocculant into the water to be treated to generate flocs of flocs, and then sediments and separates the flocs of flocculation to obtain clean treated water from the water to be treated. A device for obtaining the same, which is a rectangular box-shaped stirring tank 12 and a stirring tank 1.
The same rectangular box type processing tank 14 adjacent to 2 and the processing tank 1
4, a downward flow inclined settling device 16 and an upward flow inclined settling device 52, respectively, and a sludge discharge device 18 are provided.

The processing tank 14 is divided into a first settling tank 58, a second settling tank 60 and a reservoir tank 38 in series in series by a first partition 54 and a second partition 56, and the first settling tank 58 is a tank wall 2.
It is separated by 3 and is adjacent to the slow stirring tank 22. The first settling tank 58 and the second settling tank 60 communicate with each other through a lower opening of the first partition wall 54. Inlet 30 for treated water
Is provided on the tank wall facing the tank wall 23 of the coagulation and mixing tank 20, and the treated water outlet 32 is the second partition wall 5 of the reservoir tank 38.
It is provided on the tank wall facing 6 and the position of the water surface of the coagulating sedimentation device 50 is defined by the height of the outlet 32. The configurations of the downward flow inclined settling device 16 provided in the stirring tank 12 and the first settling tank 58 are substantially the same as those of the first embodiment.

The upward flow inclined settling device 52 is used for the second settling tank 6
No. 0, the flow path forming body 62 and the tubular water collecting pipe 6
4 and. The flow path forming body 62 extends from the first partition wall 54 to the second partition wall 56 over the entire surface of the second settling tank 60. The flow channel forming body 62 is a combination of the corrugated plate 40a having a trapezoidal cross section shown in FIG. 2A, or the flow channel forming body 62 of FIG. Of the first partition wall 5 having the same height as the flow path forming body 40 of the inclined settling device 16 and the inclination of the flow path.
4 are arranged symmetrically with respect to each other, that is, the flow paths are arranged in opposite directions. The downward flow channel forming body 40 and the upward flow channel forming body 62 may be arranged so that the respective flow channels have the same direction. The water collection pipe 64 is formed by a pipe that communicates with the reservoir tank 38 at one end and is closed at the other end, is located above the flow path forming body 62, and is located at the center of the second sedimentation tank 60. It extends from the vicinity of the first partition 54 toward the second partition 56. Further, a large number of pores 64 are provided on both sides of the pipe at substantially equal intervals in the longitudinal direction.

The sludge discharge device 18 has the same structure as that of the first embodiment, and is provided at the bottom of the first settling tank 58 and the second settling tank 60.

The function of each device constituting the coagulating sedimentation device 50 of this embodiment will be described below. The water to be treated is the inflow port 3
From 0 to the agitation tank 12, further into the downward flow inclined settling device 16, treated in the same manner as in Example 1, the first settling tank 58.
From the second settling tank 60 through the lower opening of the first partition 54.
Flows into the bottom of. The water to be treated that has flowed into the second settling tank 60 enters the upward flow inclined settling device 52, passes through the flow path forming body 62 in the upward flow, and settles the floc flocs remaining in the downward flow inclined settling device 16. Let The purified treated water flows into the water collection pipe 64 through the pores 66, and then the reservoir tank 38.
Through the outlet 32 to the outside. According to the configuration of the second embodiment, by combining the downward flow inclined settling device 16 and the upward flow inclined settling device 52, fluctuations in the water quality of the treated water can be achieved even when the water temperature of the treated water changes rapidly. Can be minimized. In addition, in this example, the reservoir tank 38 is not always necessary, and one end of the water collecting pipe 64 is directly connected to the outflow port 32, and the treated water flowing into the water collecting pipe 64 is directly discharged to the outflow port 32.
You may make it flow out from the outside.

Embodiment 3 FIG. 4 shows the configuration of a modified example of Embodiment 2 of the flocculation-sedimentation apparatus equipped with the composite type inclined sedimentation apparatus, and FIGS. 4 (a), 4 (b) and 4 (c) are plan views thereof, respectively. , Line XX ′ in FIG.
4 is a sectional view taken along line YY 'in FIG. 4A. Of the devices and parts shown in FIG. 4, those having the same functions as those shown in FIGS. 1 and 3 are designated by the same reference numerals,
The description is omitted. The same applies to FIGS. 5, 6 and 8. As shown in FIG. 4, the coagulation-sedimentation apparatus 70 of this embodiment includes a stirring tank 12, a processing tank 14, and a processing tank 14.
2 on both sides of the downward flow inclined settling device 16 and the downward flow inclined settling device 16 provided along the longitudinal direction thereof.
Upward-flow inclined settling devices 52A and B arranged individually and a sludge discharging device 18 are provided, and the configuration of each device is substantially the same as that of the second embodiment.

The processing tank 14 includes two first partition walls 72A and 72B which are parallel to each other and a second partition wall 74 which is orthogonal to the first partition wall 72. Two second settling tanks 78 arranged on both sides in the direction
It is divided into A and B and a reservoir 38. Two second
The settling tanks 78A and 78B communicate with the first settling tank 76 through the lower openings of the first partition walls 72A and 72B, respectively. In the first settling tank 76, the downward flow inclined settling device 16 is installed in the second settling tank 7
Upflow inclined settling devices 52A and B are housed in 8A and B, respectively. The direction of the flow path forming body 40 of the downward flow inclined settling apparatus 16 and the direction of the flow path forming bodies 62A, B of the upward flow inclined settling apparatus 52A, B may be the same direction or opposite directions. In FIG. 4, reference numeral 30 denotes an inlet for the water to be treated.
2 is an outlet of treated water, 40, 62A and B are flow path forming bodies, 42 is a distribution pipe, 64A and B are water collecting pipes, and L is a water surface.

In the third embodiment, the water to be treated flows separately from the downward flow inclined settling device 16 into the upward flow inclined settling devices 52A and 52B, and after being treated therein respectively, it joins in the reservoir tank 38 and the outlet. Outflow from 32. In the present embodiment, the upward flow inclined settling device 52 is arranged on both sides of the downward flow inclined settling device 16 in the longitudinal direction, so that the water to be treated is directed upward from the downward flow inclined settling device 16. Flow tilt settling device 52A,
When flowing into B, it flows along the first partition wall 72 over its entire length with a uniform distribution and a uniform flow velocity, so that the sedimentation separation in the upward flow inclined sedimentation device 52 is performed more efficiently. Also in this example, as in the case of the second embodiment, the reservoir tank 38 is not always necessary, and the water collecting pipes 64A, 64B are not necessary.
The treated water that has flowed into the outlet may be directly discharged from the outlet 32.

Example 4 Example 4 is a modification of Example 3, in which FIG. 5 (a) is its plan view and FIG. 5 (b) is taken along line XX 'in FIG. 5 (a). FIG. The coagulation-sedimentation apparatus 80 of the present embodiment includes a cylindrical stirring tank 12 and a cylindrical processing tank 14 which are concentrically arranged with a cylindrical wall 82 therebetween.
2 is divided into a coagulation and mixing tank 20 and a slow stirring tank 22 by a first cylindrical partition wall 84, and the processing tank 14 is a second cylindrical partition wall 8
It is divided by 6 into a first settling tank 76 and a second settling tank 78.

The coagulation and mixing tank 20 and the slow stirring tank 22 are the first
It communicates through the lower opening of the cylindrical partition 84, and
The settling tank 76 and the second settling tank 78 communicate with each other through a lower opening of the second cylindrical partition wall 86. The first settling tank 76 has a cylindrical downward flow inclined settling device 16, and the second settling tank 78 has a cylindrical upward flow inclined settling device 5 as well.
2 are installed so that the flow paths face the circumferential direction of the sedimentation tank. In the present embodiment, instead of the distribution pipe, the water to be treated overflows the slow stirring tank 22 over the cylindrical wall 82 and flows into the downward flow inclined settling device 16.
Further, a circular gutter 88 is provided along the outer tank wall of the second settling tank 78 in place of the water collecting pipe, and the treated water flows out from the second settling tank 78 to the outside through the circular gutter 88.

According to the configuration of this embodiment, the coagulating sedimentation apparatus can be made compact and the required site area can be reduced.

Example 5 Example 5 is an example in which the cylindrical flocculation-sedimentation apparatus of Example 4 is modified into a rectangular flocculation-sedimentation apparatus 90, which is the same as the configuration of Example 4 except for the difference in plane shape. is there. 6 (a) is a plan view thereof, and FIG. 6 (b) is a sectional view taken along line XX 'of FIG. 6 (a).

Example 6 Example 6 is an example in which the cylindrical flocculation-sedimentation apparatus of Example 4 is modified. FIG. 9 (a) is its plan view and FIG. 9 (b) is that of FIG. 9 (a). It is sectional drawing in line XX '. The difference from Example 4 is the following point. In the coagulation-sedimentation apparatus 100 of the present embodiment, the cylindrical processing tank 14 has a first partition tank 122 and a second precipitation tank 1 which are concentric with each other by a cylindrical partition wall 120.
It is divided into 24 and. Regarding addition and mixing of the coagulant, instead of the coagulation and mixing tank 20, the in-pipe mixer (line mixer) 102 is placed in the treated water introducing pipe 104, and the tubular inflow guide 106 is placed in the slow stirring tank 22. Is provided,
The outlet of the introduction pipe 104 is located at a position facing the inlet of the inflow guide 106. In addition, the slow stirring tank 22 is formed as a bottomed cylinder, and is arranged concentrically above the first settling tank 122. The water to be treated is introduced through the introduction pipe 1 on the upstream side of the in-pipe mixer 102.
After the coagulant is added in 04 and mixed in the in-pipe mixer 102, it passes through the inflow guide 106 and enters the slow stirring tank 22 from its lower part.

Unlike the third embodiment, the downward-flowing inclined settling device 16 installed in the first settling tank 122 has a flow path from the upper side to the lower side toward the inside of the first settling tank 122. The upward flow inclined settling device 52 installed in the settling tank 124 forms a flow path from the bottom to the upper side toward the inside of the second settling tank 124. In addition, in this embodiment, the bottom of the processing tank 14 is
It is formed in a cone shape having the center as the deepest portion, and the mud discharge port 108 is provided at the deepest portion. Further, in place of the sludge discharge device 18 of the third embodiment, another type of the scraping type sludge discharge device 110 is provided. It comprises a frame body 112 having a bottom side that matches the bottom of the processing tank 14, and a scraping blade 113 attached to the frame body 112.
It is rotated around it by 14, and the sludge deposited on the bottom of the treatment tank 14 is scraped to the center by the scraping blade 113 and discharged from the mud discharge port 108. The rotating shaft 114 passes through the downward flow inclined settling device 16 and the slow stirring tank 22, passes through a guide pipe 116 extending through the center of the inflow guide 106, and is connected to an upper rotating device 118. In this embodiment, since the inclined settling device having the same installation area as that of the third embodiment can be installed in the processing tank having a smaller diameter than the processing tank of the third embodiment, the precipitation apparatus can be made compact as compared with the third embodiment. Can be configured.

Test Results Using the coagulation-sedimentation apparatus having the construction shown in Examples 1 and 2, a cleaning test of the water to be treated was conducted and evaluated. In a conventional coagulating sedimentation device provided with a horizontal flow inclined settling device or an upward flow inclined settling device, when a temperature rise of about 0.5 ° C. per hour occurs in the water to be treated, a drift due to a difference in density occurs. The sedimentation and separation function deteriorated, and the quality of the treated water deteriorated. On the other hand, in the coagulation-sedimentation apparatus provided only with the downward flow inclined sedimentation apparatus of Example 1, it was confirmed that the quality of the treated water does not deteriorate even when the temperature of the treated water rises by about 5 ° C. per hour. did it. Further, in the coagulating sedimentation apparatus of Example 2 equipped with both the downward flow inclined sedimentation apparatus and the upward flow inclined sedimentation apparatus, the treated water is treated even if the temperature rise of about 8 ° C. per hour occurs in the treated water. It was confirmed that the water quality in the area did not deteriorate. Therefore, it was demonstrated that the downward flow inclined settling apparatus of Example 1 and the composite type inclined settling apparatus of Example 2 can maintain the settling separation performance even when the temperature of the water to be treated is significantly increased. Further, in the conventional coagulation-sedimentation apparatus, coagulation flocs were accumulated on the flow path forming body and troubles such as blockage of the flow path occurred, but in Example 1, the coagulation flocs have their own weight action and the action of pushing out the water to be treated. By the synergistic effect with the above, it smoothly drops from the deposited flow channel to the bottom of the settling tank, and in the coagulation-sedimentation device of Example 2, most of the coagulation flocs settle in the downward flow inclined sedimentation device. In the flow gradient settler, the amount of aggregated flocs that settled was small, and the flow path was not blocked.

[0041]

As is apparent from the above description, according to the structure of the present invention, a downward flow inclined settling device or a composite type inclined settling device in which a downward flow inclined settling device and an upward flow inclined settling device are combined. Compared to the conventional horizontal flow inclined settling device and upward flow inclined settling device, the device is
Stable and good sedimentation performance is exhibited, the quality of treated water is maintained at a predetermined level, and smooth sludge can be discharged at all times. Therefore, the settling device provided with the downward flow inclined settling device or the composite type inclined settling device according to the present invention can obtain clear treated water even if the temperature of the water to be treated changes.
Moreover, since the sludge is discharged smoothly, stable operation can be performed for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing the configuration of Example 1 of a coagulating sedimentation apparatus equipped with a downward-flowing inclined sedimentation apparatus according to the present invention.

2 (a) and 2 (b) are perspective views of a trapezoidal corrugated plate and a molded body, respectively.

FIG. 3 is a schematic vertical cross-sectional view showing the configuration of Example 2 of the flocculation-sedimentation apparatus including the composite type inclined sedimentation apparatus according to the present invention.

4 (a), (b) and (c) are a plan view of Example 3, a cross-sectional view taken along line XX 'of FIG. 4 (a), and a line of FIG. 4 (a). It is sectional drawing in YY '.

5 (a) is a plan view of the fourth embodiment, and FIG. 5 (b) is a cross-sectional view taken along line XX 'of FIG. 5 (a).

6 (a) is a plan view of the fifth embodiment, and FIG. 6 (b) is a sectional view taken along line XX 'of FIG. 6 (a).

FIG. 7 (a) and FIG. 7 (b) are perspective views of a settling guide plate used in a conventional inclined settling device.

8 (a) and 8 (b) are diagrams for explaining a state in which a cold water mass and a drift are generated in a processing tank in a conventional inclined settling apparatus.

9 (a) is a plan view of the sixth embodiment, and FIG. 9 (b) is a sectional view taken along line XX 'in FIG. 9 (a).

[Explanation of symbols]

 10 Example 1 of Coagulation-sedimentation apparatus 12 Stirring tank 14 Treatment tank 16 Down-flow inclined sedimentation apparatus 18 Sludge removal device 20 Coagulation-mixing tank 22 Slow stirring tank 23 Tank wall 24, 34 Partition wall 26 Rapid stirrer 28 Slow stirrer 30 Flow Inlet 32 Outlet 36 Settling tank 38 Reservoir tank 40 Flow path forming body 40a Trapezoidal corrugated forming plate 40b Forming body 42 Minute piping 44 Pore 46 Waste mud hopper 48 Waste mud pipe 50 Coagulation-sedimentation apparatus Example 2 52 Upflow Inclined settling device 54 First partition 56 Second partition 58 First settling tank 60 Second settling tank 62 Flow path forming body 64 Water collecting pipe 66 Pore 70 Example of coagulating sedimentation device 72 First partition 74 74 Second partition 76 1 Settling tank 78 Second settling tank 80 Example 4 of coagulating sedimentation apparatus 82 Cylindrical wall 84 First cylindrical partition wall 86 Second cylindrical partition wall 88 Circular gutter 90 Example 5 of coagulating sedimentation apparatus Example 6 of coagulation-sedimentation apparatus 102 In-pipe mixer 104 Inlet pipe 106 Inflow guide 108 Drainage port 110 Scratch-type sludge discharge device 112 Frame 113 Scraping blade 114 Rotating shaft 116 Guide pipe 118 Rotating device 120 Cylindrical partition 122 122 1 settling tank 124 second settling tank

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hidetoshi Takami 5-5-16 Hongo, Bunkyo-ku, Tokyo Inside Organo Corporation

Claims (3)

[Claims] 1. A flow path forming body comprising a molded body having a shape in which a plurality of cylinders are adjacent to each other so as to form a flow path inside thereof, or a flow path is formed between facing plate-like members. A flow path forming member composed of a plurality of plate-shaped members arranged in
The flow path is arranged so as to be inclined with respect to the horizontal plane, and the suspension in the liquid to be treated is allowed to settle while guiding the liquid to be treated so that the liquid flows in the flow channel from top to bottom. A downward-flowing inclined settling device. 2. A plurality of inclined settling devices arranged in series so as to sequentially flow the liquid to be treated, wherein at least one inclined settling device is a downward flow inclined settling device, and the remaining inclined settling devices are A composite-type inclined settling apparatus, which is an upward flow inclined settling apparatus configured to flow a liquid to be treated from below to above along a flow path. 3. A settling apparatus comprising either the downflow tilted settling apparatus according to claim 1 or the composite type tilted settling apparatus according to claim 2.