JP2008238013A - Sludge water distribution feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge water thickening system which can be structured according to the required treatment amount, can be manufactured at a low cost, and requires no (or simple) maintenance and inspection. <P>SOLUTION: In a sludge water distribution feeder for distributing and feeding fibrous material-containing sludge water to a plurality of thickeners through an open channel, the forward and rear ends of a main open channel are closed, gates for making overflow water flow are installed in the top part of both side plates of the main open channel, branched open channels are arranged in parallel outside both side plates, a sludge water supply pipe is set inside the main open channel, and a slitlike opening is installed in the sludge water supply pipe so as to face downward. When an actual flow rate shows a variation of -25 to +50% to a standard flow rate, an effective effect can be obtained by setting a ratio of a slit width to the diameter of the sludge supply pipe to 20 to 40%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention belongs to the technical field of sludge concentrators used for sewage treatment and the like. More specifically, when a plurality of small-scale sludge water concentrators are provided instead of one large-scale sludge water concentrator, an open channel that supplies sludge water evenly to each sludge concentrator. Belongs to the technical field.

In the conventional sludge water treatment apparatus, when the amount of sludge water to be treated is small, it can be treated by one small sludge water concentrator. Moreover, even if the amount of sludge water to be processed increases, it is sufficient to use a large sludge water concentrator. For example, as disclosed in Patent Document 1, a belt press type gravity concentrator, a centrifugal concentrator, or a screen concentrator may be used as a large sludge water treatment apparatus. A press-type gravity concentrator or a screen concentrator can treat 40 to 50 cubic meters / hour of sludge water, and a centrifugal concentrator can treat 100 cubic meters / hour of sludge water. However, these large concentrators are not only expensive to produce, but also expensive to maintain and inspect. Furthermore, it is difficult to save space and energy.
Published patent publication, JP 2001-96297, sewage treatment method and apparatus for sewer discharge

On the other hand, as a small sludge water concentrator, for example, as disclosed in Patent Document 2, there is a “honeycomb type concentrator”. Honeycomb type concentrators are superior in terms of production cost, maintenance and inspection costs, energy savings, etc., but only one cubic meter / hour of sludge water can be processed per unit, and it is difficult to increase the size at present. is there. Therefore, if a plurality of small concentrators are used at the same time, not only a concentrator corresponding to the required large throughput is constructed, but also the above problem is solved. However, in order for a plurality of concentrators to function uniformly and efficiently, a distributor that can supply sludge water evenly to each concentrator is required.
Published Patent Gazette, JP 2006-21136 A, Sludge Concentration Structure

As an apparatus for distributing and supplying sludge water, an apparatus in which a branch open channel is provided in the main open channel can be considered. However, in the above apparatus, there is a problem that the flow rate of the branch open channel becomes non-uniform. In order to solve this problem, it is conceivable to use a movable weir as disclosed in Patent Document 3, for example. That is, it will be possible to make the flow rate of each branch open channel uniform by providing a movable weir at the branch point of the main open channel and the branch open channel. However, when a plurality of movable weirs are provided, there is a problem that the device becomes expensive. In addition, when the flow rate is high, the flow rate increases, so the flow rate of the branch open channel provided downstream is likely to increase. Conversely, when the flow rate is low, the flow rate decreases, and the flow rate of the upstream branch open channel increases. There is also a problem that the flow rate tends to increase and the height of the movable weir needs to be adjusted.
Published patent publication, JP-A-11-93148, upstream water level adjustment sluice

  As described above, the present invention constitutes a sludge water concentrating system according to the required processing amount, and can be manufactured at low cost, and does not require (or simple) maintenance inspection. It is an issue to provide.

In order to solve the above problems, the present invention employs the following means. That is, the invention according to claim 1 is an apparatus for distributing and supplying sludge water containing fibrous materials to a plurality of concentrators in an open channel, and closes the front end and the rear end of the main open channel, A weir for flowing overflow water is provided at the top of both side plates of the main open channel, a branch open channel is arranged in parallel outside the both side plates, a sludge water supply pipe is arranged inside the main open channel, and the sludge The water supply pipe is provided with a slit-like opening downward.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the slit-like opening width has a predetermined ratio with the diameter of the sludge water supply pipe.

  According to a third aspect of the present invention, in the second aspect of the present invention, the predetermined ratio is selected so that the sludge water flow rate in each branch open channel is uniform.

  The invention described in claim 4 is characterized in that, in the invention of claim 2, the slit-like opening width is 20% to 40% of the diameter of the sludge water supply pipe.

  The invention according to claim 5 is characterized in that, in the invention according to claims 1 to 4, the slit-like opening width is limited to a minimum width or more so that the fibrous material in the sludge water is not entangled. Yes.

  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the minimum width is approximately 30 millimeters.

The invention according to claim 7 is the invention according to claim 6, wherein the supply pipe is a cylindrical steel pipe, the inner diameter of the steel pipe is substantially half the width of the main open channel, and the central axis of the steel pipe is the It is characterized by being placed at a depth that is about half or less than the depth of the main open channel.

The invention according to claim 8 is the invention according to claims 1 to 7, wherein the sludge water concentrator is constituted by a honeycomb concentrator.

The invention according to claim 9 is the invention according to claim 1, wherein the sludge supply pipe has a diameter determined so that the inflow velocity of the sludge water is 0.45 meters or less per second, and the sludge water flowing out from the slits. The slit width is determined so that the flow velocity is in the range of 0.06 to 0.08 meters per second.
The invention according to claim 10 is the invention according to claim 1, wherein the sludge water supply pipe has an axial length at the foremost end and the end of the plurality of concentrators. It is characterized by being longer than the distance between the central axes of the arranged concentrators.

  According to the present invention, it is possible to obtain an effect that a plurality of concentrators of the same standard can be used according to a required processing amount. Moreover, it is possible to produce a sludge water concentrator system that can be manufactured at a low cost and that can be easily maintained and inspected.

  In the present embodiment, a sludge concentration system in which five honeycomb type concentrators (hereinafter referred to as honeycomb concentrators) having a standard processing amount of 10 cubic meters per hour are provided on both sides will be described. In the sludge water concentration system of this embodiment, the standard treatment amount (sludge water supply amount) of sludge water is 100 cubic meters per hour. FIG. 1 shows a perspective view of an embodiment of the present invention. FIG. 2 shows a top plan view of an embodiment of the present invention, and FIG. 3 shows a cross-sectional side view as seen from XX in FIG. 4A is a front view as viewed from U-U in FIG. 3, and FIG. 4B is a cross-sectional view as viewed from V-V.

1-4, the main open channel 11 is provided in the center of the box 10 whose upper surface is open. The main open channel 11 has a rectangular cross section, and the front end and the rear end are closed. Further, weirs (for example, rectangular weirs) 12a for flowing overflow water are provided on both side plates 12 and 12 of the main open channel 11. The rectangular weir 12a is provided so that the overflow sludge water coincides with the height of the inlet (not shown) of the honeycomb concentrator 17 (17a, 17b, 17c,...). The width of the rectangular weir 12a is determined from the average water speed and height of the overflow water over the weir 12a. Further, a sludge water supply pipe 20 is disposed substantially at the center of the main open channel 11. The sludge water supply pipe 20 is provided with a slit-shaped opening 21 downward. The slit width S of the slit-shaped opening 21 is obtained by experiments as will be described later. The sludge water supply pipe 20 is connected to an external sludge water supply pipe by a flange 22.

Branch open channels 13 are provided in parallel on both outer sides of both side plates 12 of the main open channel 11. That is, the branch open channel 13 is divided into a plurality (ten in this embodiment) of the branch open channels 13a, 13b, 13c,. A honeycomb concentrator 17a, 17b, 17c,... Is installed in each branch open channel 13a, 13b, 13c,. Overflow sludge water from the rectangular weir 12a enters the inlet of the honeycomb concentrator 17, and the separated water separated by the honeycomb concentrator 17 (17a, 17b, 17c,...) Is separated into the separation water tank 16 (16a, 16b, 16c). , ...) is supplied with water. The separation water tank 16 (16a, 16b, 16c,...) Also serves as the branch open channel 13 (13a, 13b, 13c,...). The separated water stored in the separated water tank 16 is taken out to the outside through the separated water take-out pipe 36. The concentrated sludge concentrated by the honeycomb concentrator 17 is supplied to the concentrated sludge take-out pipe 37 and discharged to the outside. The drain remaining in the main open channel 11 is discharged through the discharge pipe 38.

  In the present embodiment, the sludge water supplied from the sludge water supply pipe 20 is supplied downward from the slit-like opening 21 (toward the bottom of the main open channel 11) as an ejection flow by the above configuration. When the sludge water is filled into the main open channel 11, it overflows from the rectangular weir 12a and enters the inlet of the honeycomb concentrator 17 provided in each branch open channel 13a, 13b, 13c,. Separated. The separated separated water passes through the honeycomb screen, is separated to the outside of the screen, is supplied to the separated water tank 16, and is guided to the outside from the separated water intake pipe 36. The concentrated sludge 39 is supplied to the concentrated sludge take-out pipe 37 and discharged to the outside.

  Hereinafter, a method and an experiment for determining the slit width S will be described. In this embodiment, the supply amount (standard processing amount) of sludge water is set to 100 cubic meters per hour, and the width and depth (height) of the main open channel 11 are determined to an extent corresponding to it. The experiment was performed using a model, and the size of the model was reduced to (1 / √5) of the real machine (embodiment), and the time change of the model was reduced to (1 / √5) of the real time. As a result, the flow rate ratio between the model and the actual machine is (1 / √5) cubed ÷ (1 / √5) = 1/5. The sludge water used for the model was the same as that for the actual machine.

<Purpose of the experiment>
The sludge water supply pipe 20 of the actual machine has a closed pipe at the end and is provided with a slit-like opening 21 downward, so that it is difficult to analytically determine the conditions for equalizing the amount of overflow water. In the experiment, as in the case of the actual machine, there are five paths on both sides. Therefore, the amount of overflow water over the weir 12a is measured for each of the ten weirs 12a, and the difference between the average value and the larger one of the maximum value or the minimum value is calculated. The value divided by the average value is defined as the average error. Therefore, the purpose of this experiment is to change the supply flow rate of the sludge water supply pipe, the relationship between the average error and the width S of the slit-like opening under the sludge water supply pipe 20 submerged in the center of the main open channel. Let me clarify. Furthermore, it is to clarify the relationship between the surface speed passing through the slit-like opening and the average error of the amount of overflow water over the distributed weir 12a. Further, the width and depth of the main open channel 11 and the position and inner diameter of the sludge water supply pipe are determined.

<Experiment contents>
The purpose of the experiment is to confirm that the sludge water is well distributed in the portion of the weir 12a where the overflow water gets over, so the flow rate at the weir 12a (collecting 10 of these will be supplied from the sludge water supply pipe 20). Adjust the total sludge water flow). By adjusting the flow rate of the weir 12a, that is, the flow velocity, the supply flow rate is also changed at the same time. Further, since the flow rate of the weir 12a is adjusted in the model, the downstream of the separation open channels 13a, 13b, 13c,... So that the flow rate of the separation open channels 13a, 13b, 13c,. In addition, a side plate 30 provided with a right triangular weir 31 shown in FIG. 5 was additionally installed. In FIG. 5, hi is a right triangular weir overflow height, B is the width of the separation tank, and D is the water depth. In addition, the flow rate was determined based on a quick flow chart so that the flow rate could be immediately determined by the overflow water level over the triangular weir.

Under the above conditions, the average flow rate, the maximum flow rate and the minimum flow rate of each branch open channel 13a, 13b, 13c,... Of the model were obtained, and the average error was obtained from these data. The experiment has 30mm (24%), 45mm (36%), and 60mm (48%) width of the slit-shaped opening at the bottom of the model sludge water supply pipe and no sludge water supply pipe (sludge water supply pipe in the main open channel) This was carried out for each case of supplying sludge water directly at the side wall of the main open channel. In addition, the numerical value in said parenthesis shows the ratio of the slit width with respect to the internal diameter of a sludge water supply pipe by (%). In addition, the sludge water supply rate in the model is 15 cubic meters per hour (in this case, the sludge water supply pipe rush speed is 0.34 m / s); 20 cubic meters per hour (0.45 m / s); 30 cubic meters per hour (0.68 m) / S) for each case.

<Experimental result>
The data of these experimental results are shown in FIG. 6, and the graph is shown in FIG. In the experiment, the length of the sludge water supply pipe in the slit-like opening in the axial direction is 2.3 m, and the slit extends to the center of each weir 12a. Therefore, when the slit width is 60 mm and the sludge supply rate is 15 cubic meters per hour (in this case, the slit outflow rate is 0.03 m / s), the slit width is 30 mm and the sludge supply amount is 30 cubic meters per hour (slit outflow rate is 0). .12 m / s). In either case, fibrous deposits did not remain in the slit.

Regarding the latter problem, the flow rate of the model is (100 cubic meters per hour) × (1/5) = (20 cubic meters per hour), and the inflow sludge water flow rate of the sludge water supply pipe is (0.3 to 0.7). ) Since sludge separates in the pipe unless it is set to about m / s, a 125 mm diameter circular pipe is used, and the width of the main open channel of the model is twice the diameter of the sludge water supply pipe (125 mm × 2 = 250mm) and set to a narrow main open channel state. In addition, the sludge water supply pipe is installed so that the central axis is at a depth of 250 mm, and the depth of the main open channel is 280 mm, the height of the actual weir 12a (630 mm) (1 / √5). It was.

<Consideration of experimental results>
The following findings were obtained from the above experimental results. First, when a sludge water supply pipe having a downward slit-like opening is provided, the sludge water supply pipe is not arranged, and the average error is smaller than that in the case of supplying the sludge water directly, and the sludge is evenly distributed. Since water can be supplied, the effect of arranging a sludge water supply pipe having a slit-like opening was recognized. In particular, the greater the sludge water flow rate, the greater the effect, and the smaller the flow rate, the smaller the effect. When the flow rate of sludge water is small, it can be inferred that the effect is improved by reducing the slit width ratio.

Therefore, when the actual flow rate varies (−25% to + 50%) with respect to the standard flow rate, it is effective to set the slit width ratio to 20% to 40% with respect to the diameter of the sludge water supply pipe. Is recognized. In particular, it is desirable to set the slit width ratio to about 20%. This is because if there is no sludge water supply pipe, the liquid level in the main open channel will wave and fluctuate, and the flow rate of the overflow will vary depending on the distance from the inlet. Use a supply pipe with a slit. This is because the liquid level becomes smooth and the water level becomes uniform. However, in the actual machine, if the ratio of the slit width is made too small, the fibrous material adheres to the slit-like opening, so it is necessary to provide a certain lower limit width (for example, 30 mm).

  As explained above, according to the invention of this embodiment, the average error can be suppressed to 20% or less, and the effect that the uniform distribution of sludge water is practically possible is obtained. As a result, the effect that the system configuration in which the sludge water concentrator system operates efficiently as a whole becomes possible is obtained. In particular, the effect of functioning effectively for changes in the flow rate of sludge water was obtained.

  The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention.

1 shows a perspective view of an embodiment implementing the present invention. The top view of this embodiment is shown. XX sectional drawing in FIG. 2 is shown. (A) The front view of this embodiment is shown. (B) YY sectional drawing is shown. A right triangular weir provided on the side plate of the model is shown. The data of an experimental result are shown. The graph of an experimental result is shown.

Explanation of symbols

10 Box 11 Main open channel 12 Side plate 13 Branch open channel (separated water tank)
14 Partition plate 16 Separation water tank 20 Sludge water supply pipe 21 Slit-shaped opening 30 Side plate 31 of model machine Right angle triangular weir

Claims (10)

In an apparatus for distributing and supplying sludge water containing fibrous materials to a plurality of concentrators in an open channel, the front end and the rear end of the main open channel are closed, and overflow water is applied to the top of both side plates of the main open channel. Weirs are provided, branch open channels are arranged in parallel on the outside of the both side plates, a sludge water supply pipe is arranged inside the main open channel, and a slit-like opening is provided downward in the sludge water supply pipe A sludge water distribution and supply device characterized by that. 2. The sludge water distribution and supply device according to claim 1, wherein a ratio of the slit-shaped opening width to a diameter of the sludge water supply pipe is a predetermined ratio. 3. The sludge water distribution and supply device according to claim 2, wherein the predetermined ratio is selected so that the sludge water flow rate in each branch open channel is uniform. The sludge water distribution and supply device according to claim 2, wherein the slit-shaped opening width is 20% to 40% of the diameter of the sludge water supply pipe. The sludge water distribution and supply device according to any one of claims 1 to 4, wherein the slit-like opening width is limited to a minimum width or more so that the fibrous material in the sludge water is not entangled. 6. The sludge water distribution and supply device according to claim 5, wherein the minimum width is about 30 millimeters. The sludge water supply pipe is a cylindrical steel pipe, the inner diameter of the steel pipe is approximately half of the width of the main open channel, and the central axis of the steel pipe is approximately half or less the depth of the main open channel. The sludge water distribution and supply device according to any one of claims 1 to 6, wherein the sludge water distribution and supply device is arranged at a position. The sludge water distribution and supply device according to any one of claims 1 to 7, wherein the sludge water concentrator comprises a honeycomb concentrator. The sludge water supply pipe is set so that the inflow speed of sludge water is 0.45 meters or less per second, and the flow speed of sludge water flowing out from the slit is in the range of 0.06 to 0.08 meters per second. The sludge water distribution and supply device according to claim 1, wherein a slit width is defined in the sludge water. The axial length of the sludge water supply pipe is longer than the distance between the central axes of the concentrators arranged at the front end and the concentrator arranged at the rear end among the plurality of concentrators. The sludge water distribution and supply device according to claim 1.

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