JPH11156106A - Method for recovering sludge of river cleaning equipment and sludge retension hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover easily sludge deposited solidified on a slant surface of a hopper by a method wherein a fluid is ejected uniformly upward from an upper part peripheral edge of a sludge retention hopper, and a water current in the sludge retention hopper is made a circulating current which ascends in a peripheral edge part and descends in a central part. SOLUTION: A circulating current which ascends on a peripheral edge and descends near a center is generated in a hopper 10 by air ejected from an aeration pipe 11 provided peripherally on an upper part peripheral edge of a hopper 10. For the circulating current, its flow rate is fastest in a peripheral edge part of the hopper 10 by being urged by air ejected from the aeration pipe 11, and becomes slow near a center having no urge of air. Therefore, sludge becomes more easy to deposite near the center, and since river water in the hopper 10 is always circulated, deposited sludge is also difficult to generate compaction by consolidation. Then, it is very seldom that sludge is adhered onto a slanting surface of the hopper 10, and discharge of the sludge becomes very easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a river purification apparatus for purifying river water, and more particularly, to a sludge collection method and a sludge hopper for collecting sludge generated by a purification treatment in the river.

[0002]

2. Description of the Related Art River purification devices are installed on riverbeds and the like.
River water is once drawn into the device, subjected to a predetermined purification treatment, and returned to the river, thereby improving the water quality of the entire river. Such a river purification apparatus usually includes a plurality of purification tanks, each of which is filled with a different type of contact material. The river water continuously passes through these septic tanks and comes into contact with various contact materials, thereby removing suspended substances and decomposing organic pollutants by microorganisms to be purified.

On the other hand, with the purification treatment of river water, sludge is generated in the septic tank and accumulates at the bottom of the septic tank. Since this sludge has a high degree of pollution, it is not preferable to return to the river, and it is necessary to separately treat it as industrial waste. Each septic tank is provided with a substantially conical hopper for depositing and recovering sludge at the bottom thereof, and it is common practice to periodically discharge sludge from the lower end of the hopper with a suction pump or the like to separately process the sludge.

[0004]

However, the sludge accumulated on the inclined surface of the hopper is compacted by compaction as the accumulation proceeds, and is fixed on the inclined surface.
For this reason, when the sludge is discharged from the lower end of the hopper, it is easy to collect the sludge located around the center of the hopper,
It was difficult to collect the sludge fixed on the inclined surface. Accordingly, an object of the present invention is to provide a sludge collection method of a river purification apparatus and a sludge storage hopper capable of easily collecting sludge deposited and solidified on an inclined surface of a hopper.

[0005]

According to the present invention, a substantially cone-shaped sludge reservoir hopper provided at the bottom of a septic tank and having a discharge port at the center of the lower end thereof is uniformly and constantly confined during the purification process. Sludge recovery of a river purification device, characterized by forming a water flow in the sludge reservoir hopper as a circulating flow that rises at a peripheral portion of the sludge reservoir hopper and descends at a central portion by ejecting a fluid upward. A method is provided (claim 1). According to this means, the water flow in the sludge reservoir hopper during the purification process forms a circulating flow that rises at the periphery of the sludge reservoir hopper and descends at the center. This circulating flow has a high flow velocity at a peripheral portion which is urged by the ejection of the fluid, and has a low flow velocity at a central portion which is not urged. Therefore, the sludge tends to accumulate at the center of the hopper, and the amount of the sludge accumulated on the inclined surface of the hopper is reduced.
For this reason, when sludge is collected from the sludge collecting hopper, the operation becomes extremely easy.

[0006] An apparatus for carrying out this method includes:
In a substantially cone-shaped sludge reservoir hopper provided at the bottom of the septic tank and having a discharge port at the lower center, a means for uniformly and upwardly ejecting a fluid is provided on an upper peripheral edge of the sludge reservoir hopper. There is a sludge reservoir hopper of a river purification device which is a feature of the present invention (claim 3). The sludge collecting hopper has a substantially pyramidal shape opened in the direction of the septic tank, and specifically has a pyramid shape, a conical shape, or a shape similar to these, and has a side wall provided at the center of the lower end. Any shape that is inclined toward the exit may be used. The fluid may be either gas or liquid, and may be air, water, or the like. As the means for ejecting the fluid, a device in which a diffuser pipe, a sprinkler tube, or the like is installed along the peripheral portion can be used, and a pump or the like can be used for pumping the ejected fluid.

Further, according to the present invention, the liquid is supplied from the inclined surface of the substantially conical sludge reservoir hopper provided at the bottom of the septic tank and having a discharge port at the lower end to the lower end of the sludge reservoir hopper along the inclined surface. By ejecting the sludge, a liquid film is formed between the inclined surface and the fixed sludge to eliminate the sticking, and the entire sludge on the inclined surface is slid down to the discharge port by its own weight. The present invention provides a method for recovering sludge of a river purification device. According to this means,
As liquid is ejected to the slant surface of the sludge reservoir hopper,
Of the sludge fixed on the inclined surface, a portion fixed to the inclined surface is dissolved by the liquid, and the sludge slides down along the inclined surface by its own weight. Therefore, the operation of collecting the sludge becomes extremely easy. The ejection of the liquid may be performed only at the time of collecting the sludge.

[0008] As an apparatus for carrying out this method,
A means for ejecting a liquid on the inclined surface of the sludge reservoir hopper toward the lower end of the sludge reservoir hopper along the inclined surface, in a substantially conical sludge reservoir hopper provided at the bottom of the septic tank and having a discharge port at the lower end. There is a sludge reservoir hopper of a river purification device characterized by the provision of (4). The sludge collecting hopper according to the present invention has a substantially conical shape opened in the direction of the septic tank, specifically, a pyramid shape, a conical shape, or a shape similar thereto, and a side wall is provided at a lower end. Any shape may be used as long as the shape is inclined toward the discharge port, but the discharge port does not need to be provided at the center of the lower end. The liquid does not need to be particularly special, and water can provide a sufficient effect. As a means for ejecting the liquid, a water sprinkling pipe can be used. However, in consideration of the sludge sliding down, it is preferable that the apparatus is installed without projecting from the inclined surface of the hopper.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a river purification apparatus to which a sludge hopper according to the present invention is applied. The river purification device is installed adjacent to a river to be purified, and in particular, is often installed underground on a riverbed as shown in FIG. The river purification apparatus is provided with a plurality of continuous purification tanks 1 (a to d) having different treatment purposes, and river water flows into these purification tanks 1 from the inlet channel 2. In each septic tank 1, the river water is restricted by the partition plate 3, once flows toward the bottom of the septic tank, rises and flows into the next septic tank, and is finally returned to the river through the discharge water channel 4.

[0010] Each of the septic tanks 1 is provided with a contact member 5 for each purpose. Usually, the first half septic tanks 1a and 1b
The main purpose is to adjust the water flow suitable for purification treatment and to remove suspended substances in river water. As the contact material 5, a honeycomb-shaped plastic contact material or the like is used. Septic tanks 1c and 1d in the latter half are mainly for the purpose of decomposing organic pollutants in river water and the like. As the contact material 5, an irregular plastic contact material having a large contact area with river water is used. Then, air is aerated from the aeration tube 6 into the water in the tank to activate the microorganisms. River water is purified by passing through the septic tank 1, but sludge is generated in each of the septic tanks 1 as a by-product of the purification treatment, and is naturally settled in the sludge reservoir hopper 10 below the septic tank 1.

FIG. 2 shows a sludge reservoir hopper 10 according to the present invention.
FIG. The sludge reservoir hopper 10 is formed in a substantially pyramid shape so that the sludge accumulated in the hopper 10 is promoted to flow to the lower center, and a discharge port 10a for discharging sludge is provided at a lower end of the hopper 10. Sludge that has accumulated in the hopper 10 is appropriately suctioned through the discharge port 10a and removed. The hopper 10 includes an air diffuser 11 provided around an upper peripheral edge thereof. The air diffuser 11 constantly blows air upward (in the direction of the contact material) at an appropriate interval.

The air blown out from the air diffuser 11 generates a circulating flow in the hopper 10 that rises at the periphery and descends near the center. FIG. 3 shows the circulation flow in the hopper 10, and the arrows indicate the water flow in the hopper 10. This circulating flow has the fastest flow velocity at the periphery of the hopper 10 due to the urging of air ejected from the air diffuser 11, and the flow velocity decreases near the center where no air is urged. For this reason, the sludge is more likely to settle in the vicinity of the center, and since the river water in the hopper 10 constantly circulates, the accumulated sludge is less likely to be compacted by compaction. Therefore,
Sludge hardly adheres to the slope of the hopper 10, and sludge discharge is extremely easy.

Next, another embodiment of the hopper 10 will be described. The hopper 10 'shown in FIG. 4 is provided with an impeller 12 which rotates to the center of the hopper 10' by air blown out from the air diffuser 11 ', in addition to the air diffuser 11'. The rotation of the impeller 12 causes the sludge hopper 1
Precipitation at the 0 'center is further promoted. FIG. 5A shows a plan view of another hopper 10 ″. The hopper 10 ″ is formed by fixing a plurality of partition plates 13 to the side wall of the hopper 10 ″ located above the air diffuser 11 ″. FIG. 5 showing a cross-sectional view taken along line AA in FIG.
As shown in (b), it is provided in a state inclined in a predetermined direction.

The circulating flow urged by the air diffuser 11 "due to the inclination of the partition plate 13 is limited to this, and rises obliquely, further increasing the vortex as shown by the arrow in FIG. This eddy current is formed in the hopper 1 of the sludge.
It promotes the sedimentation at the center of 0 "and reduces the amount of sludge deposited on the inclined surface.

FIG. 6 shows another hopper 20 according to the present invention. The hopper 20 is configured such that the hopper 10 shown in FIG. 2 includes an air diffuser 11 at an upper peripheral edge, while a water diffuser 21 is provided at a position slightly closer to the center of the hopper inclined surface. The sprinkler pipe 21 sprays water downward along the inclined surface of the hopper 20 only when sludge is discharged. Specifically, as shown in FIG. 6A, the sprinkling pipe 21 blows water downward along the inclined surface against the sludge 7 that has been compacted by compaction and fixed on the inclined surface of the hopper. Then, a water film is formed between the inclined surface and the sludge 7 (FIG. 6B), and the sticking of the sludge is eliminated. Further, the sludge 7 slides on the water film and slides down to the discharge port along the inclined surface due to its own weight, which makes it extremely easy to recover the sludge.

In this case, in order to make the sludge 7 slide down more smoothly, it is preferable that the water sprinkling pipe 21 is provided without protruding from the hopper inclined surface. As such an installation method, as shown in FIG. 6A, a sprinkler pipe 21 is installed in a recess provided on an inclined surface, and FIG.
As shown in FIG. 6, a nozzle portion is provided on the water sprinkling pipe 21 ', and only the nozzle portion is installed on the inclined surface.
As shown in (d), there is a method in which an inclined surface is formed in a stepped shape and a sprinkling pipe 21 ″ is installed at the step.

[Brief description of the drawings]

FIG. 1 is a schematic view of a river purification device to which a sludge hopper according to the present invention is applied.

FIG. 2 is an external view of a sludge reservoir hopper 10 according to the present invention.

FIG. 3 is a diagram showing a circulation flow in the hopper 10.

FIG. 4 is a diagram illustrating a structure of a hopper 10 '.

5A is a plan view of the hopper 10 ″. FIG.
It is sectional drawing which follows the line AA of FIG.5 (a).

FIG. 6A is a diagram illustrating a structure of a hopper 20; (B) It is a figure showing the behavior of the water sprinkling pipe 21 in the hopper 20. (C) It is a figure showing the installation method of the water sprinkling pipe 21 '. (D) It is a figure showing the installation method of the water sprinkling pipe 21 ".

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 (a to d) Septic tank 2 Introductory channel 3 Partition wall 4 Discharge channel 5 Contact material 6 Aeration tube 10, 20 Sludge reservoir hopper 10a Discharge port 11 Aeration tube

Claims (4)

[Claims] 1. A method in which a fluid is constantly and upwardly ejected from the upper peripheral edge of a substantially conical sludge reservoir hopper provided at the bottom of a septic tank and having a discharge port at a lower central portion thereof. A method of recovering sludge of a river purification apparatus, wherein a water flow in the sludge reservoir hopper is formed as a circulating flow rising at a peripheral portion of the sludge reservoir hopper and descending at a central portion thereof. 2. A liquid is ejected from the inclined surface of a substantially conical sludge reservoir hopper provided at the bottom of the septic tank and having a discharge port at the lower end toward the lower end of the sludge reservoir hopper along the inclined surface. A sludge for a river purification apparatus, characterized in that a film of the liquid is formed between the slope and the fixed sludge to eliminate the sticking, and the entire sludge on the slope is slid down to the discharge port by its own weight. Collection method. 3. A substantially cone-shaped sludge reservoir hopper provided at the bottom of a septic tank and having a discharge port at the center of a lower end thereof, means for uniformly ejecting fluid upward from an upper peripheral edge of the sludge reservoir hopper. A sludge reservoir hopper for a river purification device, which is provided. 4. A substantially cone-shaped sludge reservoir hopper provided at the bottom of a septic tank and having a discharge port at a lower end, on the inclined surface of the sludge reservoir hopper, along the inclined surface toward the lower end of the sludge reservoir hopper. A sludge reservoir hopper for a river purification device, comprising means for ejecting a liquid.