JPH11267409A - Precipitating type waste water treating tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the frequency of work for recovering a precipitate from an initial precipitation tank to improve work efficiency and to reduce the costs of waste water treatment by preventing slug from being biasted and precipitated near the inflow port part of the initial sedimentation tank and wide dispersing the slug in the initial sedimentation tank to precipitate it. SOLUTION: This precipitating type waste water treating tank has such a shape that from a waste water inflow port 1 toward the downstream, its width is gradually enlarged from width W1 equal to ore more than that of a waste water inflow port 1 to width W2 equal to that of the bottom surface of an initial sedimentation tank 2 and is provided with a floor surface 6 inclined downward and also three sides except the downstream side are covered with a wall surface 2b along the shape of the floor surface. Further, on the floor surface 6, a baffle 7 is provided so that the flow is divided into two by putting a wedge for the waste water flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sedimentation type wastewater treatment tank for separating solid particles from wastewater containing fine solid particles by natural sedimentation and recovering the separated water.

[0002]

2. Description of the Related Art Slag generated in nonferrous metal dry smelting is granulated by a granulator and recovered. In this water granulation process, wastewater containing a large amount of fine slag called granulated slag is generated. As one of devices for sedimenting and collecting slag from this wastewater, a sedimentation type wastewater treatment device has been conventionally used. FIG. 4 is a schematic plan view showing a basic configuration of a conventional sedimentation type wastewater treatment tank, and FIG.
FIG. 5 is a sectional view taken along the line V-V of FIG.

[0003] This wastewater treatment tank is provided with an initial settling tank 51 for conducting wastewater first to precipitate most of the granulated slag particles, and is disposed downstream thereof to remove the remaining relatively fine particles. Final settling tank 5 for sedimentation to obtain clear water
And 2. Further, between the initial settling tank 51 and the final settling tank 52, a plurality of flow holes 53 for rectifying wastewater in the initial settling tank 51 and flowing to the final settling tank 52 are uniformly formed on the entire surface. Are provided.

The wastewater to be treated passes through a drainage channel 55 and flows into a primary sedimentation tank 51 from a wastewater inlet 56. The outflow side of this initial settling tank 51 is provided with a rectifying wall
Is blocked by the wall. Further, the initial settling tank 51 is formed in an open box shape having a width much larger than the width of the wastewater inlet 56, and has a volume capable of containing a large amount of wastewater. ing. For this reason, the flow rate of the wastewater flowing through the drainage channel 55 is rapidly reduced immediately after flowing into the initial settling tank 51. Most of the slag particles in the wastewater settle and accumulate in the initial settling tank 51. At this time, slag with large particles accumulates near the wastewater inlet 56, and the particles of the slag accumulate smaller as going downstream. In addition, the amount of slag settled gradually decreases toward the downstream. In the wastewater flowing into the initial settling tank 51, the slag and the water are completely mixed, and the mixing ratio of the slag in the wastewater gradually decreases toward the downstream. The wastewater flowing through the initial settling tank 51 flows into the final settling tank 52 through the flow hole 53 in the straightening wall 54. The flow is rectified by passing through the flow holes 54. In the final sedimentation tank 52, relatively fine particles in the wastewater that have not completely settled in the initial sedimentation tank 51 are settled in a stream flowing downstream. Then, almost clear water is obtained before flowing to the discharge side of the final settling tank 52. The clarified stream obtained through the final settling tank 52 is discharged from a discharge port not shown.

On the other hand, slag A precipitated in the initial settling tank 51
As shown in FIGS. 6 (a) and 6 (b), for example, a crane 57 equipped with an openable and
Is automatically operated, picked up by the grab bucket 58, loaded on the truck 59, and collected. In addition, the final sedimentation tank 5
The slag that has settled in 2 is settled in the vicinity of the rectifying wall and collected by a crane equipped with the above-mentioned grab bucket. Slag that has settled near the discharge side is drained from the tank every several tens of months, and then collected using a vehicle called a loader (not shown) having a large shovel in front of it. Most of the slag to be deposited is in the initial settling tank 51.
Therefore, the frequency of the slag collection operation in the initial settling tank 51 is much higher than that in the final settling tank 52. As described above, in the slag collecting operation, a very large apparatus is used in accordance with the size of the settling tank, so that the cost burden is increased. In order to reduce costs, it is desirable to reduce the frequency of collection work as much as possible. For this purpose, it is necessary to spread the slag accumulation area as uniformly as possible over the entire tank in an initial settling tank in which most of the slag is settled.

[0006]

However, in the conventional settling type wastewater treatment tank, as shown in FIGS. 4 and 5, the initial settling tank 51 is provided with an outlet of a drainage channel 55, that is, a wastewater inlet 56 of the initial settling tank 51. The slag contained in the wastewater was mostly discharged from the wastewater inlet 56 of the initial settling tank 51 because the slag contained in the wastewater was largely connected to a box-shaped tank having a wide width and an open top.
A phenomenon such that the sedimentation was deviated only in the vicinity occurred, and the result was that the vicinity of the wastewater inlet 56 was immediately filled with sediment. On the other hand, the sediment in the vicinity of the wastewater inlet 56 obstructs the inflow of the wastewater. Therefore, even if the amount of sediment is less than the total sediment recoverable amount of the initial sedimentation tank 51, the scale described above is large. Work must be performed to remove the sediment. For this reason, in the conventional settling type wastewater treatment tank,
The slag collected in the initial settling tank has to be collected frequently, and the efficiency of the collection operation has deteriorated and the cost burden of wastewater treatment has increased. The present invention has been made in order to solve the above problems, to prevent the slag is settled near the inlet of the initial settling tank,
Sedimentation wastewater that can be dispersed widely in the initial sedimentation tank to settle slag, thereby reducing the frequency of work for collecting sediment from the initial sedimentation tank, improving work efficiency, and reducing wastewater treatment costs. The task is to provide a processing tank.

[0007]

In order to solve the above-mentioned problems, a sedimentation type wastewater treatment tank according to the present invention comprises an initial sedimentation tank having an open wastewater inlet, a sedimentation tank disposed downstream thereof, and an initial sedimentation tank. A rectifying wall disposed between the tank and a settling tank disposed downstream thereof, and having a plurality of flow holes for rectifying the flow of the initial settling tank and sending the flow to the settling tank disposed downstream. In the sedimentation type wastewater treatment tank, the width is gradually increased from the wastewater inlet to the downstream from the width approximately equal to or larger than the wastewater inlet to the width similar to the bottom of the initial sedimentation tank, and In addition to providing a downwardly inclined floor surface, three sides other than the downstream side are covered with wall surfaces along the floor surface shape, and further, on the floor surface, wedges are inserted into the wastewater flow to divide the flow into two. A baffle (baffle) is provided so that

In the present invention, preferably, the baffle (baffle plate) comprises a frame, a support for supporting the frame, and a flat plate attached to the outside of the frame, and the material constituting these is metal, plastic, or It is composed of these composite materials.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sedimentation type wastewater treatment tank according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view showing an embodiment of a sedimentation type wastewater treatment tank according to the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 3A and 3B show the baffles in the present embodiment, respectively. FIG. 3A is an enlarged view of a main part of FIG. 2, FIG. 3B is a perspective view showing the outline of the configuration of the framework, and FIG. The sedimentation type wastewater treatment tank according to the present embodiment is provided with an initial sedimentation tank 2 in which a wastewater inlet 1 is opened, a final sedimentation tank 3 disposed downstream thereof, and an initial sedimentation tank 2 and a final sedimentation tank 3. And a flow regulating wall 5 having a plurality of flow holes 4 uniformly on the entire surface thereof. Rectification wall 5
The rectifier rectifies the flow of the initial settling tank 2 through the circulation hole 4 and sends it to the final settling tank 3. The depth of the initial sedimentation tank 2 may be greater than the depth of the final sedimentation tank 3 so that the sediment collection operation using a bucket crane or the like omitted in the figure is facilitated.

In the sedimentation type wastewater treatment tank of this embodiment, FIG.
As shown in the figure, a floor surface 6 which is inclined downward from the wastewater inlet 1 to the downstream is provided. As shown in FIG. 1, the floor 6 is formed so as to gradually increase in width from a width W ₁ equal to or larger than the wastewater inlet 1 to a width W ₂ equal to the bottom 2 a of the initial settling tank 2. . Further, three sides other than the downstream side along the shape of the floor surface 6 are covered with the wall surface 2b. However, with this configuration alone, most of the sediment accumulates unevenly near the wastewater inlet 1 of the initial settling tank 2. In order to prevent uneven sedimentation in the vicinity of the wastewater inlet 1, the wastewater flow must be introduced so as to spread to a width W ₂ approximately equal to the bottom surface 2 a of the initial sedimentation tank 2. Therefore, in this embodiment, the floor 6
A baffle (baffle plate) 7 is installed on the top so as to insert a wedge for the flow, and the baffle 7 divides the wastewater stream into two.

The baffle 7 is shown in FIGS. 3 (a), 3 (b) and 3 (c).
As shown in FIG. 1, a frame 8 formed by assembling rod-shaped members in a triangular shape is supported by columns 9, and a flat plate 10 is attached to the outside of the frame 8. These materials may be any of metal, plastic, or a composite material thereof.
Considering that wastewater is seawater having high metal corrosivity, it is preferable to use a composite material that has been subjected to a rust-proof treatment such as coating the surface of a metal material such as an iron material with a plastic. The baffle 7 is provided on a part of an inspection frame 11 in which, for example, the lower end of the column 9 is embedded in the floor surface 6 and the upper end thereof is covered with, for example, a net so that the inside of the settling tank can be observed from above. It is fixed so as to be fitted into steel (not shown). In FIG. 1 and FIG.
1 is omitted.

[0012] The initial settling tank 2 of the present embodiment, the edge portion 6a of the floor surface 6 in which the width W ₂ of the same level as the bottom surface 2a, are dug vertically toward the bottom surface 2a. In addition, as shown in FIG. 2, in the initial settling tank 2 of the present embodiment, the installation location of the inclined floor surface 6 is formed in advance in a step-like manner, and a slope having a triangular cross section corresponding to the floor surface 6 is formed there. However, a member having a shape as shown in FIG. 1 is fitted. However, the form from the edge 6a of the floor 6 to the bottom 2a and the floor 6
Is not necessarily limited to this embodiment. In addition, the length, width, depth and other dimensions of each sedimentation tank and the inclination angle of the floor 6 are settled at a predetermined particle size of the slag in the wastewater, the settling time, the settling time, the horizontal movement distance, and the final settling tank. It is designed in consideration of the allowable concentration of slag in the liquid near the outlet.

Next, the wastewater treatment in the sedimentation type wastewater treatment tank of the present embodiment configured as described above will be described. The wastewater to be treated flows through the drainage channel 12 from the wastewater inlet 1 into the initial settling tank 2. When the wastewater flowing through the drainage channel 12 flows into the initial settling tank 2, the flow velocity is rapidly reduced. Most of the slag particles in the wastewater settle and accumulate in the initial settling tank 2. At this time, slag with large particles accumulates at the wastewater inlet 1 side, and the particles of the slag accumulate smaller as going downstream. Also,
The amount of slag settling also decreases gradually toward the downstream. In the wastewater flowing into the initial settling tank 2, the slag and the water are completely mixed, and the mixing ratio of the slag in the wastewater gradually decreases toward the downstream. The wastewater flowing in the initial settling tank 2 flows into the final settling tank 3 through the flow hole 4 in the flow regulating wall 5. The flow is rectified by passing through the flow holes 4. In the final sedimentation tank 3, relatively fine particles in the wastewater that could not be settled in the initial sedimentation tank 2 are settled in a stream flowing downstream. Then, almost clear water is obtained before flowing to the discharge side of the final settling tank 3. The clarified stream obtained through the final settling tank 3 is discharged from a discharge port not shown.

On the other hand, the slag precipitated in the initial settling tank 2 is:
As shown in FIGS. 6 (a) and 6 (b), for example, a crane 57 equipped with an openable cargo handling device called a grab bucket is automatically operated, picked up by a grab bucket 58, loaded on a truck 59, and collected. . The slag settled in the final settling tank 3 is settled in the vicinity of the straightening wall 5 and collected by a crane equipped with the above-mentioned grab bucket. The slag that has settled near the discharge side is drained from the final settling tank 3 every several tens of months, and then collected using a loader (not shown).

At this time, the sedimentation type wastewater treatment apparatus of the present embodiment is provided so that the floor 6 is inclined downward from the wastewater inlet 1 to the downstream. It becomes easy to flow to. In this case, the floor 6 is formed by expanding the width gradually from the width W ₁ and the same level or more of the wastewater inlet 1 to the width W ₂ of the bottom surface 2a and the same degree of initial settling tank 2, the floor 6 The three sides other than the downstream side are covered with the wall surface 2b according to the shape of, and a baffle 7 is provided on the floor surface 6 so as to insert a wedge for the flow. For this reason, the wastewater flow to the initial settling tank 2 is divided not in the direction of the straightening wall 5 in front of the wastewater inlet 1 but in the direction of the side walls 2 c of the initial settling tank 2, and the sediment is in the vicinity of the wastewater inlet 1. Instead, the sedimentation and sedimentation spread over a wide area in the inner initial sedimentation tank ₂ over the width W2.

Therefore, according to the sedimentation type wastewater treatment apparatus of the present embodiment, the slag which has been settled and deposited near the wastewater inlet in the initial settling tank is dispersed and settled throughout the tank. Can be. Therefore, the wastewater inlet 1
The area is not immediately filled with slag, and much more slag is stored in the tank until the slag deposited near the wastewater inlet 56 hinders the inflow of wastewater compared to the conventional initial settling tank. Deposited on As a result, according to the sedimentation type wastewater treatment apparatus of the present embodiment, the frequency of performing a large-scale sediment removal operation can be significantly reduced.

[0017] To process the Example granulated slag waste water, and specifications as follows sedimentation waste water treatment tank of the same configuration as FIG. 1, was observed slag condition of deposition of the initial settling vessel. (1) Initial settling tank Width: 10 meters, length: 5 meters, depth: 5 meters (2) Final settling tank Width: 10 meters, length: 25 meters, depth: 4 meters Initial settling tank is sediment Was installed about 1 meter deeper than the final settling tank in order to increase the storage capacity of the final settling tank. The rectification wall is installed between the initial settling tank and the final settling tank, and the wall has a diameter of 1 mm.
A large number of 50 mm round holes are uniformly formed over the entire surface. The floor from the wastewater inlet to the bottom of the initial settling tank was provided with an inclination of about 45 degrees so that even if the slag settled near the inlet, it moved downstream and the inlet was not blocked. A baffle for the incoming wastewater stream was provided on this slope to wedge the wastewater stream so that the stream was bisected. As a result, the wastewater flow that flows from the wastewater inlet to the initial settling tank is bisected by baffles (baffles) and reaches the inside along the side wall of the initial settling tank,
Granulated slag did not accumulate in the vicinity of the entrance of the initial settling tank, but spread widely on the bottom of the tank.

[0018]

According to the sedimentation type wastewater treatment tank of the present invention, the sediment can be widely deposited on the entire bottom surface of the initial sedimentation tank, so that the frequency of discharging the sediment from the initial sedimentation tank can be reduced. Wastewater treatment costs can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of a settling type wastewater treatment tank according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 shows baffles in the present embodiment,
(a) is an enlarged view of a main part of FIG. 2, (b) is a perspective view showing an outline of a framework, and (c) is a plan view thereof.

FIG. 4 is a schematic plan view showing a basic configuration of a conventional sedimentation type wastewater treatment tank.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIGS. 6A and 6B respectively show an outline of facilities for collecting slag by a crane equipped with a grab bucket in a settling type wastewater treatment tank, wherein FIG. 6A is a front view and FIG. 6B is a side view.

[Explanation of symbols]

 1,56 Wastewater inlet 2,51 Initial sedimentation tank 2a Bottom surface 2b Wall surface 2c Side wall 3,52 Final sedimentation tank 4,53 Flow hole 5,54 Rectification wall 6 Floor plate 6a Edge 7 Baffle (baffle plate) 8 Frame 9 Column 10 Flat plate 11 Inspection frame 12, 55 Drainage channel 57 Crane 58 Grab bucket 59 Truck

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Fumio Kodama 3-5-3 Nishihara-cho, Niihama-shi, Ehime Pref.

Claims (2)

[Claims] An initial sedimentation tank which is disposed between an initial sedimentation tank having an open wastewater inlet, a sedimentation tank disposed downstream thereof, and an initial sedimentation tank and a sedimentation tank disposed downstream thereof. A rectifying wall having a plurality of flow holes for rectifying the flow of the wastewater and sending the rectified flow to a sedimentation tank disposed downstream, in the same manner as the wastewater inlet from the wastewater inlet to the downstream. It has a shape that is gradually widened from a width not less than about to the same width as the bottom of the initial settling tank, and a floor surface that slopes downward is provided, and along the floor shape other than the downstream side A sedimentation type wastewater treatment tank characterized in that three sides are covered with a wall surface, and a baffle (baffle plate) is provided on the floor surface so as to divide the wastewater flow into two by inserting a wedge. 2. The baffle (baffle) comprises a framework, a support for supporting the same, and a flat plate attached to the outside of the framework, and the material constituting these is metal, plastic, or a composite material thereof. The sedimentation type wastewater treatment tank according to claim 11, characterized in that: