JPH078001Y2 - Settling equipment for sludge treatment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treatment settling apparatus suitable as a gravity type sedimentation tank having a sludge attractor such as a high-rate separator as a solid-liquid separation apparatus for wastewater treatment.

[0002]

2. Description of the Related Art FIG. 5 is a schematic cross-sectional view showing a conventional high rate separator. In the figure, 1 is a tank for receiving raw inflow water.
It is divided into one raw water inflow chamber 3 and one filtration chamber 4. Here, the raw water inflow chamber 3 is formed in a tank shape deeper than the filtration chamber 4, and the raw water inflow chamber 3 and the filtration chamber 4 communicate with each other at a lower portion of the partition wall 2. And
A floating filter medium layer 6 having a specific gravity of 1 or less is filled and held on the filter medium supporting member 5 in the filtration chamber 4, and a backwash air pipe 7 for backwashing the filter medium is arranged below the floating filter medium layer 6. ing. In the figure, reference numeral 8 is a sludge extraction pipe provided on the bottom side of the raw water inflow chamber 3, and 9 is a treated water overflow outlet provided on the upper side wall of the filtration chamber 4.

Next, the operation will be described. The raw water containing sludge continuously flows into the raw water inflow chamber 3 of the tank 1, so that the inflow raw water of the filtration chamber 4 is subjected to an initial settling process in which a part of the sludge settles at the bottom of the raw water inflow chamber 3. Inflow to the bottom side. The raw water flowing into the bottom side of the filtration chamber 4 becomes an upward flow and passes through the floating filter medium layer 6, and at the time of the passage, the solid organic matter in the raw water is adsorbed and removed by the floating filter medium layer 6. Therefore, in the upper part of the filtration chamber 4, the filtered water that has passed through the floating filter medium layer 6 remains. The filtered treated water is discharged from the treated water overflow outlet 9 of the tank 1. When the compressed air is jetted from the backwash air pipe 7 after the discharge, the floating filter medium layer 6 is washed by the raw water flow by the jetted air. The sludge settled and deposited on the bottom of the raw water inflow chamber 3 is appropriately extracted and removed from the sludge extraction pipe 8.

[0004]

The conventional high rate separator is constructed as described above, and only one raw water inflow chamber 3 and one filtration chamber 4 are formed in a single tank 1. However, since the occupying area of the one filtration chamber 4 becomes wide, raw water does not flow into the entire filtration chamber evenly, and therefore, only a partial filtering function by some filtering materials can be exerted. In addition, there is a problem that the filtration efficiency is unavoidably reduced and the backwashing efficiency of the filter medium is deteriorated. In particular, an important point in commercializing such a high-rate separator is a method of backwashing the filter medium layer 6, but since the filter medium layer 6 is made of a floating filter medium having a specific gravity of 1 or less, There was a problem that the efficiency of the filter media washing in the upward flow of raw water due to the jetted air of 1 was extremely poor, and the efficiency of the first settling and the final settling of sludge contained in the incoming raw water could not be achieved in a single tank.

The present invention has been made in order to solve the above problems, and a plurality of filtration chambers are formed by partitioning in a single tank constituting a sludge sedimentation basin, and an occupied area for each filtration chamber unit. By reducing the water content, the raw water in the tank can be evenly flowed into each filtration chamber to improve the filtration efficiency, and the filter medium in each filtration chamber can be selectively and efficiently ensured by the raw water in the tank. Can be washed
It is an object of the present invention to provide a sludge treatment settling device that can improve the efficiency of initial and final settling of sludge.

[0006]

A sludge treatment settling apparatus according to a first aspect of the present invention is formed with a tank for receiving inflowing raw water and settling sludge in the raw water, and a partition formed near the water surface in the tank. And a plurality of filtration chambers whose bottoms are opened in the tank, and a sludge scraper that is housed in the tank and scrapes the sludge settled and accumulated on the bottom of the tank. Each of the filter media is filled with a filter medium layer having a specific gravity of 1 or more, and a backwash drain valve is provided at a position lower than the water level during filtration in the upper filtered water region of these filter medium layers.

In the sludge treatment settling apparatus according to the second aspect of the present invention, the backwash air jetting means is arranged under each of the filter medium layers.

[0008]

The sludge treatment settling apparatus according to claim 1 of the present invention comprises:
By forming a plurality of open-bottom filtration chambers near the water surface in a single tank that constitutes the sludge settling tank, the raw water in the tank can be evenly flowed into these filtration chambers. As a result, the upward flow of the raw water with respect to the filter medium layer filled in each of the filter chambers allows the filter medium layers of the respective filter chambers to smoothly perform general filtration. Therefore, 1
The filtration efficiency is significantly increased as compared with the conventional case where only a partial filtering function of one of the two wide area filtering media layers can be exerted. Further, the filter medium layer filled in each of the filter chambers is made of a filter medium having a specific gravity of 1 or more, and a backwash drain valve is provided at a position lower than the water level at the time of filtration in each upper filtered water region of each of the filter medium layers. Therefore, at the time of backwashing the filter medium, select a filtration chamber to be backwashed at an appropriate location among the above-mentioned filtration chambers, and open the backwash drain valve of that system to open the filtration chamber to be backwashed. As the water level becomes lower than the water level of other filtration chambers (filtration chamber with backwash drain valve closed),
Raw water in the tank flows into the filtration chamber to be backwashed.
As a result, an upward flow of the raw water is generated in the filtration chamber to be backwashed, and the upward flow of the raw water causes the filter medium having a specific gravity of 1 or more to frequently flow and be washed with stirring. Therefore, the cleaning efficiency of the filter medium is improved, and the efficiency of the first settling and the final settling of sludge in a single tank can be improved.

In the sludge treatment settling apparatus according to the second aspect of the present invention, at the time of backwashing the filter medium, the backwash air jetting means arranged below the filter medium layer of the selected filter chamber to be backwashed is directed toward the filter medium layer. By ejecting the backwashing air by the above, the cleaning efficiency of the filter medium in the first aspect can be further improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing a sludge treatment settling apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG.
4 is an enlarged cross-sectional view showing a state of the filtration chamber at the time of filtration, FIG. 4 is an enlarged cross-sectional view showing a state of the filtration chamber of FIG. Overlapping description is omitted. In FIGS. 1 and 2, 10 is a settling chamber which is formed by partition walls 2 in the tank 1 and whose bottom communicates with the raw water inflow chamber 3, and 11 is held near the water surface of the settling chamber 10 to discharge the floating scum. The scum skimmer 12 is a sludge attractor housed and arranged in the sedimentation chamber 10, and the sludge attractor 12 is driven to rotate by a drive motor 13 to remove sludge settled on the bottom of the sedimentation chamber 10. It is composed of a link belt that is collected on the bottom of the raw water inflow chamber 3.

A plurality of filtration chambers 41, 42, 43, 44 are formed by a partition wall 14 in the vicinity of the water surface on the side opposite to the raw water inflow chamber 3 in the settling chamber 10.

On the upper portion of the partition wall 14, a filtered water trough 15 for inflowing and discharging filtered water is integrally formed. As shown in FIG. 2, these filtered water troughs 15 each communicate with a filtered water discharge passage 1A formed on one side of the tank 1 having an overflow weir 15a. In addition,
The overflow weir 15a may be vertically adjustable.

The bottom of each of the filtration chambers 41 to 44 is opened at the top of the sludge attractor 12. The insides of the filtration chambers 41 to 44 are individually filled with filter medium layers 61, 62, 63, 64 having a specific gravity of 1 or more through a filter medium supporting grating 51 (see FIGS. 3 and 4).

A backwash drainage trough 16 is arranged in the upper filtered water area of the filter medium layers 61 to 64 in each of the filtration chambers 41 to 44. As shown in FIGS. 3 and 4, the backwash drainage trough 16 has a fixed or vertically movable overflow overflow weir 16a on each side. The backwash drainage trough 16 is provided in a backwash drainage channel 1B (see FIG. 2) formed on the other side of the tank 1 and a backwash drainage valve (automatic valve) 17 is provided.
Through. Here, the backwash drainage trough 16
Is maintained at a position lower than the water level during filtration in the upper filtered water area of the filter medium layers 61 to 64, and the backwash drainage trough 1
The backwash drainage valve 17 is provided at a communication portion with the backwash drainage channel 1B at the six ends. Therefore, this backwash drain valve 17
Is also maintained at a position lower than the water level during filtration.

Further, under the filter medium supporting grating 51 in each of the filter chambers 41 to 44, filter medium layers 61 to 6 are formed.
4, backwash air pipes (backwash air jetting means) 71 to 74 for jetting backwash air are arranged.

Next, the operation will be described. The raw water containing sludge continuously flows into the raw water inflow chamber 3 of the tank 1, so that the inflow raw water enters the settling chamber 10 while a part of the sludge contained in the raw water flows into the bottom of the raw water inflow chamber 3. Inflow. The raw water that has flowed into the settling chamber 10 flows into each of the filter chambers 41 to 44 evenly from the lower portion while the sludge is settled here. The raw water flowing into these filtration chambers 41 to 44 becomes an upward flow and passes through the filter medium layers 61 to 64 of the respective systems. During this passage, the solid organic matter in the raw water is removed by the filter material layers 61 to 64, and the raw water is filtered. At the time of this raw water filtration, all the backwash drain valves 17 are closed, so that the filtered treated water that has passed through the filter medium layers 61 to 64 rises above the filter medium layers 61 to 64 in each of the filtration chambers 41 to 44. And the supernatant filtered water flows into the treated water trough 15 and is then discharged to the outside of the system through the filtered water discharge passage 1A.

Next, when backwashing the filter medium, first, the filter chamber to be backwashed is selected from the filter chambers 41 to 44. When the selected filtration chamber is, for example, 42, when the backwash drain valve 17 of this filter chamber 42 system is opened, the backwash drain valve 17 and the backwash drain trough 16 are provided at a position lower than the water level during filtration. As a result, the filtered water in the upper part of the filtration chamber 42 flows into the backwash drainage trough 16, and then is discharged to the outside of the system through the backwash drainage channel 1B. As a result, the water level in the filtration chamber 42 to be backwashed becomes lower than the water levels in the other filtration chambers 41, 43, 44 in which the backwash drain valve 17 is not opened. Therefore, the raw water in the tank 1 flows into the filtration chamber 42 to be backwashed, and the filter material layer 62 is washed by the upward flow of the raw water generated in the filtration chamber 42. In this case, since the filter medium layer 62 is made of a filter medium having a specific gravity of 1 or more, the filter medium layer 62 is frequently fluidized and agitated by the upward flow of the raw water.
The washing of 2 is very efficient.

During such backwashing of the filter medium, the backwash air is jetted from the backwash air pipe 72 of the system of the filtration chamber 42 toward the filter medium layer 62 of the system, so that the filter medium layer 62 is discharged.
The backwashing efficiency of is further improved.

On the other hand, the sludge settled and deposited at the bottom of the settling chamber 10 is attracted and accumulated at the bottom of the raw water inflow chamber 3 by operating the sludge scraper 12 at an appropriate time, and the accumulated sludge is illustrated. No Recovery is released to the outside of the system by a drainage valve or extraction pump.

[0020]

As described above, according to the present invention, a plurality of open-bottom filter chambers are formed near the water surface in a single tank that constitutes a sludge sedimentation basin. The raw water in the tank can be evenly flowed in. Therefore, the upward flow of the raw water with respect to the filter medium layers filled in the respective filtration chambers allows efficient filtration by all the filter medium layers in each filtration chamber smoothly. It has the effect of being exposed. In addition, the filter medium layers filled in the respective filtration chambers have a specific gravity of 1 or more, and a backwash drain valve is provided at a position lower than the water level at the time of filtration in each upper filtered water region of each of the filter medium layers. Therefore, when backwashing the filter medium, select the filtration chamber to be backwashed from each of the above-mentioned filtration chambers, and open the backwash drain valve of the selected filtration chamber system, the water level of the filtration chamber to be backwashed will be the backwash drainage. When the water level becomes lower than the water level of the other filtration chamber with the valve closed, and the raw water in the tank flows into the filtration chamber to be backwashed, an upward flow of the raw water generated in the filtration chamber to be backwashed has a specific gravity of 1 The above filter medium is frequently fluidized and agitated, and therefore, there is an effect that the filter medium is thoroughly and efficiently washed. Further, since the backwash air jetting means is provided below the filter medium layer of each filtration chamber, the backwash air is blown toward the filter medium layer from the backwash air jetting means during the backwashing of the filter medium as described above. If it is jetted out, the cleaning efficiency of the filter medium layer is further improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a sludge treatment settling apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view showing a filtration state of the filtration chamber in FIG.

FIG. 4 is an enlarged cross-sectional view showing a state in which the filter medium of FIG. 3 is backwashed.

FIG. 5 is a schematic cross-sectional view showing a high-rate separator as a conventional sludge treatment precipitation device.

[Explanation of symbols]

 1 Tank 12 Sludge Scraper 17 Backwash Drain Valve 41 Filtration Chamber 42 Filtration Chamber 43 Filtration Chamber 44 Filtration Chamber 61 Filtration Material Layer 62 Filtration Material Layer 63 Filtration Material Layer 64 Filtration Material Layer 71 Backwash Air Spraying Means 72 Backwash Air Jetting Means 73 Reverse Washing air jetting means 74 Backwashing air jetting means

Claims (2)

[Scope of utility model registration request] 1. A tank for receiving inflowing raw water to settle sludge in the raw water, and a plurality of filtration chambers formed by partitioning near the water surface in the tank and having respective bottoms opened in the tank. And a sludge scraper housed in the tank and scraping the sludge settled and accumulated on the bottom of the tank, and each of the filter chambers is filled with a filter material layer having a specific gravity of 1 or more. A sludge treatment settling device, wherein a backwash drain valve is provided at a position lower than the water level during filtration in the upper filtered water area. 2. The sludge treatment sediment according to claim 1, wherein a backwash air jetting means for jetting backwash air toward each of the filter medium layers is disposed below each of the filter medium layers. apparatus.