JP2001205259A - Scum removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scum removing apparatus capable of efficiently generating revolving water streams on the surface of the water even if a large amount of scum is generated in a sedimentation tank to grind floating scum to recover the same. SOLUTION: In the scum removing apparatus, a scum suction port having blades, which receive blown air to rotate, attached thereto is connected to the upper part of a scum suction pipe in a rotatable manner and air in the scum suction pipe is transferred by an air lift type pump or/and the scum suction pipe having spiral ribs arranged on the inner surface thereof is used or/and scum grinding blades are attached to the lateral surface of the scum suction port of the scum suction pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD [0001] The scum removing device of the present invention comprises:
The present invention relates to an apparatus for removing scum floating in a sedimentation tank of a wastewater treatment apparatus.

[0002]

2. Description of the Related Art In recent years, disposers have become widespread especially in homes, and an increasing number of cases in which wastewater is treated by a wastewater treatment device and discharged into public waters are increasing. In this case, small-sized biological treatment devices are often used as the wastewater treatment devices, and regulations on effluent water are becoming stricter. Therefore, scum removal is becoming an increasingly important issue for small-sized wastewater treatment devices.

[0003] Scum that floats in a sedimentation tank of a wastewater treatment device or the like becomes rotten and causes a bad smell if left for a long period of time. become. Therefore, scum must be quickly removed when it occurs.

[0004] For this reason, in a wastewater treatment apparatus, especially in a wastewater treatment apparatus having a small sedimentation tank such as a septic tank for biological treatment, a disc-shaped surface floated on the water surface to remove scum in the final sedimentation tank. From the scum suction port of
A method of removing floating scum by suctioning scum floating on the water surface by a water flow generated by an air lift pump is often adopted.

[0005] This device has few moving parts and only uses a part of the compressed air used for the aeration tank as power, so it is excellent in terms of maintenance and cost.
In addition, the scum suction port is configured to rotate by the water flow generated at the time of suction, and the scum suction port itself vibrates up and down.

[0006] The scum suction port in this device is provided with a water flow guide for changing the direction of the water flow on the surface through which the water flows, and the water flow generated when the scum is sucked hits the water flow guide and becomes a swirling water flow. It flows into the suction port.
The swirling water flow rotates the scum suction port, and the scum suction port itself vibrates up and down, so that the scum suction port is sucked from the scum suction port while crushing the floating scum.

Accordingly, when the amount of floating scum is small, it is possible to efficiently collect and remove scum. However, if the swirling water flow is hardly generated, the rotation of the scum suction port does not occur, and thus the scum suction port does not rotate. Scum is less likely to be crushed. For example, when a large amount of scum is generated, the swirling water flow is weakened, the rotation of the suction port is gradually slowed down, the scum crushing effect is reduced, and the scum that can not be removed finally ends up on the surface of the water Thickly deposited on
The treated water will deteriorate.

On the other hand, as a method of generating a swirling water flow, as disclosed in Japanese Patent Application Laid-Open No. 8-260561, when a fluid is sucked by a pump, a water flow guide blade is attached to a flow passage of the fluid to flow the flow. There is a method of changing to a swirling water flow and thereby efficiently sucking and removing floating scum and the like. However, in this case, the water flow guide vanes are provided at the bottom of the sedimentation tank, and the swirling water flow generated here affects the water surface when the water depth is shallow, but swirls on the water surface when the water depth is deep. No or no water flow will be very weak. Therefore,
In a normal sedimentation tank in which the water depth is maintained at a constant depth, the swirling water flow generated by the water flow guide blade provided at the bottom often did not reach the water surface.

In general, the scum that floats and accumulates on the surface of the sedimentation tank often has a large mass, and it is often difficult to suck the scum into the suction port as it is. Therefore, the floating scum is preferably crushed to a size that can be sucked into the suction port. However, the conventional scum suction port has a problem that scum is not effectively crushed.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional method. Even if a large amount of scum is generated in a settling tank, a swirling water stream is efficiently generated on the water surface.
Another object of the present invention is to provide a scum removing device that can be recovered by the scum removing device while crushing the floating scum.

[0011]

In order to solve the above-mentioned problems, a scum removing apparatus according to claim 1 of the present invention (Invention 1).
Is a scum removal device used in a sedimentation tank of a wastewater treatment device, in which a scum suction port equipped with blades for rotating by blowing air is rotatable to a scum suction pipe arranged below. A scum removal device, wherein the water in the scum suction pipe is connected and transferred by an air lift pump.

A scum removing device according to a second aspect of the present invention (invention 2) is a scum removing device used for a sedimentation tank of a wastewater treatment device, wherein a scum suction port is spirally formed on an inner surface disposed below the scum suction port. The scum removing device is rotatably connected to a scum suction tube provided with a rib, and water in the scum suction tube is transferred by an air lift pump.

A scum removing device according to a third aspect of the present invention (invention 3) is a scum removing device used for a sedimentation tank of a wastewater treatment device, and a blade for rotating the scum on the water surface by grinding. A scum suction port attached to the side is rotatably connected to a scum suction pipe arranged below the scum suction pipe, and water in the scum suction pipe is transferred by an air lift pump. Device.

According to the first and second aspects of the present invention, when collecting scum floating on the water surface, a swirling water flow is generated on the water surface, and the scum collecting device is rotated by the swirling water flow to vibrate up and down to crush the floating scum. In addition, the scum is efficiently removed and the scum crushing blade capable of efficiently crushing the scum is attached to the scum suction port.

(Operation) In the first aspect, since air is blown against the blade attached to the scum suction port, the scum suction port is forcibly rotated. Therefore, even if a large amount of scum is accumulated around the scum suction port and the scum suction port cannot be rotated or the scum cannot be crushed by the scum suction water flow alone, the scum suction port rotates reliably. The swirling water flow generated thereby causes the scum suction port itself to vibrate up and down while rotating, so that the scum accumulated on the water surface can be effectively crushed, thereby enabling efficient scum removal.

According to the second aspect of the present invention, since the spiral rib is provided on the inner surface of the scum suction pipe to which the scum suction port is attached, the water sucked from the water surface generates a swirling water flow that spirals. The scum accumulated on the water surface is effectively crushed by the swirling water flow, so that efficient scum removal can be achieved.

According to the third aspect of the present invention, the scum suction port is provided with scum crushing blades for crushing the floating scum by rotating the scum suction port.
When the scum suction port rotates while vibrating up and down on the water surface, the floating scum is effectively crushed, and is efficiently sucked into the scum suction port and removed by riding the swirling flow.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a scum removing apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a scum removing device of the present invention 1, and FIG.
(A) is an explanatory diagram of the scum removing device of the present invention 2, and FIG. 4 is an explanatory diagram of the scum removing device of the present invention 3.

The scum removing apparatus according to the present invention is a wastewater treatment apparatus having an aeration tank using compressed air and a sedimentation tank for separating and separating sludge as a wastewater treatment apparatus that can be installed. It can be applied to wastewater treatment equipment that has many opportunities to float on the water surface. As an example, there may be mentioned, for example, a small biological treatment device such as a disposer wastewater treatment device, a small household wastewater treatment tank, a small household combined treatment device, and a small community plant (merged treatment device).

First, a conventional scum suction device will be described. In FIG. 6, a short tubular body 3 located below a scum suction port 1 provided with a flange 2 at the upper part of the short tubular body 3 extended outwardly from the tubular body 3 in a trumpet shape. , Are rotatably inserted and connected to a scum suction pipe 4 arranged below. The scum B on the water surface flows on the flared flange portion 2 of the scum suction port 1, is collected by the central short tubular body 3, and flows into the scum suction pipe 4 connected below. It has a structure that flows down. A float 5 is provided on the lower surface side of the flange portion 2 (see FIG. 8B), and the buoyancy of the float 5 is such that the entire flange portion 2 of the scum suction port 1 just floats on the water surface. Designed.

FIG. 5 shows an example of a conventional scum suction port 1. In general, the one shown in FIG. 7A is used, but the one shown in FIG. 7B is used. Forms may also be used.

In FIG. 7A, the flange 2 has a ridge 22 having a slope gradually rising toward the outside of the flange along a tangent line 24 of the opening of the central short tubular body 3. It is configured. The ridge 22 is provided with a plurality of ridges. For example, FIG. 7A shows a ridge 22 having three ridges. The surface 26 of the flange 2 through which water flows is a substantially triangular surface composed of the ridge 22, a perpendicular 23 dropped from the point where the ridge reaches the outer periphery of the flange to the outer periphery of the flange, and the tangent line 24. 2
5, the surface 26 is gradually inclined toward one of the adjacent tangent lines 24, and water flows on the inclined surface 26 and flows into the short tubular body 3. In addition, the surface 26 of the same structure is comprised about all the ridges 22.

Accordingly, the water sucked into the scum suction port 1 collides with the substantially triangular surface 25, and its direction is changed to a swirling water flow to generate a force for rotating the scum suction port 1. At the same time, the scum suction port 1 is drawn downward by the water flow at the same time as the water is drawn, and descends along the scum suction pipe 4.

The scum suction port 1 drawn into the lower scum suction pipe 4 floats against a suction force when it sinks a certain distance due to the attached float. The raised scum suction port 1 is drawn downward while rotating again by the swirling water flow, and repeats this. As described above, the scum suction port 1 has a structure in which the scum suction port 1 repeatedly vibrates up and down while rotating.

As described above, in the conventional method, the substantially triangular surface 25 provided on the flange portion 2 acts as a water flow guide plate which changes the direction of the water flow and turns into a swirling water flow, and the force for rotating the scum suction port 1 is reduced. , Generated by the swirling water flow whose direction is changed by the water flow guide plate.

In any of the inventions 1, 2 and 3, the air lift pump 8 may be a general one which has been conventionally used. FIG.
As shown in (2), the air ejection port 9 of the air lift pump 8 is provided below the scum transfer pipe 6, and when the air A is ejected, the water inside the scum transfer pipe 6 moves upward. Along with this, the water sucked from the scum suction port 1 together with the floating scum B on the sedimentation tank water surface falls into the scum suction pipe 4 having the scum suction port 1 floating on the water surface.

The scum suction port 1 descends due to the water flow when the scum B is sucked. However, the scum suction port 1 rises after sinking a certain distance due to the buoyancy caused by the float 5 attached to the scum suction port 1. The floating scum suction port 1 sinks again by the water flow and rises again. That is, it vibrates up and down, and the principle of vibrating up and down is the same as the principle of the conventional scum suction port moving up and down.

The scum suction port 1 according to the first aspect of the present invention is provided with a flange portion 2 provided in the upper portion of a short tubular body 3 so as to extend outward from the tubular body 3 in a trumpet shape. The water flows over the flanged portion 2, is collected by the central short tubular body 3, and flows down to the scum suction pipe 3. A float 5 is provided on the lower surface side of the flange portion 2, and the buoyancy of the float 5 is designed such that the entire flange portion 2 of the scum suction port 1 floats just in line with the water surface. (See FIG. 8B)

As shown in FIGS. 2A and 2B, the scum suction port 1 according to the first aspect of the present invention has a rotation assisting blade 21 mounted above the flange 2. Air A is blown from the air pipe 7 to the blade 21, and the scum suction port 1 is forcibly rotated about the center tube 3 as an axis.
In this case, the flow of the water on the water surface becomes a swirling water flow with the rotation of the scum suction port 1, and at the same time, the speed of the swirling water flow is relatively higher than the scum suction port 1 due to the rotation of the scum suction port 1. As the rotation speed of the scum suction port 1 increases, the scum suction port 1 vibrates up and down more effectively to crush the floating scum B. The crushed floating scum B rides on the flow of water and is sucked into the scum suction port 1.

The rotation assisting blade 21 has a substantially flat plate shape, and is arranged so as to be positioned above the scum suction port 1 by a support post 211 as shown in FIG. The mounting angle of the blades may be set so that the scum suction port can be effectively rotated by the air blown. Further, the rotation assisting blade may be directly attached to the upper surface of the scum suction port as shown in FIG.

The materials of the scum suction port 1, the scum suction pipe 4, and the rotation assisting blade 21 are selected in consideration of water resistance, corrosion resistance, bacterial resistance, wear resistance, and the like. For example, as an example, synthetic resin such as vinyl chloride resin, polyethylene, acrylic styrene butadiene copolymer resin, fluororesin; fiber reinforced synthetic resin such as fiber reinforced polyester resin;
Corrosion-resistant metals such as alumite and stainless steel; and metals coated with anticorrosion coating.

Float 5 attached to scum suction port 1
The scum suction port 1 may be mounted with a determined buoyancy so that the surface of the flange 2 of the scum suction port 1 through which water flows substantially coincides with the water surface over the entire circumference of the scum suction port 1. As its material,
It is selected in consideration of water resistance, corrosion resistance, bacterial resistance, etc., for example, as an example, foamed resin of closed cells such as foamed styrene resin, foamed polyethylene resin; foamed resin or urethane foam such as polyethylene A material coated with a synthetic resin film or sheet; an air packing made of synthetic resin such as polyethylene, etc., may be appropriately selected from those having floating performance.

The method of attaching the float 5 to the scum suction port 1 is, for example, as follows, taking water resistance and corrosion resistance into consideration.
Using adhesives such as solvent-based adhesives and epoxy adhesives,
A method of directly bonding to the back surface of the flange portion 2 or the central short tube portion 3, a method of bending the tip of the flange portion 2 to create a space and storing the float 5 in the space, a method of using a thread or a wire, etc. A method of binding and fixing the short tube portion 3 may be appropriately selected.

The scum suction port 1 has a central short cylindrical portion 3 rotatably inserted into a scum suction tube 4. At this time, the upper end of the scum suction pipe 4 must be located at a depth that does not hinder the vertical vibration of the scum suction port 1. The length of the short cylindrical portion 3 at the center of the scum suction port 1 must be such that the scum suction port 1 does not fall out of the scum suction pipe 4 when the scum suction port 1 vibrates up and down.

The air jet nozzle 212 at the tip of the air pipe 7
May be disposed at a position where air can be blown against the rotation auxiliary blade 21 to rotate the scum suction port 1,
It is not always necessary that the air A hit the rotation assist blade 21 even when the scum suction port 1 vibrates up and down. Even if the air A does not hit temporarily, the scum suction port 1 vibrates up and down, so that the air A immediately hits the rotation auxiliary blade 21 and the rotation of the scum suction port 1 does not stop. It is.

As shown in FIG. 3 (b), the scum suction pipe 4 of the scum removing device according to the second aspect of the present invention has a spiral rib 41 on its inner surface, so that water sucked from the water surface is spirally formed. A scum suction pipe 4 which turns into a swirling water flow
Descends in Since this swirling water flow is generated near the water surface, it affects the water surface and causes the swirling water flow also on the water surface. The scum suction port Q vibrates up and down while rotating by the swirling water flow on the water surface thus generated, and the scum B accumulated on the water surface is effectively crushed, so that efficient scum removal can be performed. It becomes.

The helical rib 41 may be attached to the inner surface of the scum suction pipe 4 at a groove depth, pitch and angle sufficient to turn the water flowing down the scum suction pipe 4 into a swirling water flow. May be appropriately designed.

The material of the spiral rib 41 is, for example, a synthetic resin such as vinyl chloride or polyethylene, and a string or a band with a rib made of these materials is used as the scum suction pipe 4.
Attached to the inner surface of. Alternatively, when the scum suction tube 4 is manufactured, a tube manufactured by extrusion while rotating the scum suction tube 4 using an extrusion die or the like that forms an inner rib structure may be used.

The spiral rib 41 is attached at the upper end of the scum suction pipe 4 from a position where the vertical vibration of the scum suction port 1 is not hindered. Since the swirling water flow is better generated as the attachment length is longer, the attachment length is desirably longer, and may be the entire length up to the scum transfer pipe 6.

The scum suction port 1 used in the present invention 2 is
For example, as an example, FIG. 2 (a), FIG. 2 (b), FIG.
As shown in FIGS. 7A and 7B, any type of scum suction port can be applied, and may be appropriately selected and used. However, when the scum suction port 1 is of a type that rotates, the rotation direction is the same as that of the second embodiment.
Needless to say, the direction of the swirling water flow generated in the scum suction pipe 4 must be the same.

As shown in FIG. 5, scum pulverizing blades 27 are attached to the side of the flange 2 at the scum suction port 1 according to the third aspect of the present invention. The scum suction port 1 of the blade 27 is forcibly rotated about the center tube 3 while vibrating up and down by an air lift pump. Accordingly, the floating scum B is crushed by the scum crushing blade 27 attached around the scum suction port 1.
The water flow on the water surface becomes a swirling water flow as the scum suction port 1 rotates, and the crushed floating scum B rides on the flow of water and is sucked into the scum suction port 1.

The scum crushing blade 27 is substantially flat.
It may be attached directly to the side surface of the scum suction port, or, for example, as shown in FIG. The angle at which the blades are attached is substantially perpendicular to the axis of the tube 3 at the center of the scum suction port 1, but may be slightly inclined. However, if the inclination angle is too large, the rotation of the scum suction port 1 may be hindered or the vertical vibration may be hindered. Therefore, the inclination angle may be appropriately changed according to the situation. Is preferably closer to

The material of the scum crushing blade 27 is water-resistant,
It is selected in consideration of corrosion resistance, bacterial resistance, wear resistance, etc. For example, as an example, synthetic resin such as vinyl chloride resin, polyethylene, acrylic styrene butadiene copolymer resin, fluorine resin; fiber reinforced synthetic resin such as fiber reinforced polyester resin; corrosion resistant metal such as alumite, stainless steel; Metal and the like.

The recovered scum C removed by the scum removing devices of the inventions 1, 2 and 3 passes through the scum transfer pipe 6 and is appropriately selected usually in an aeration tank, a sludge nitrification tank, a sludge concentration tank or the like. Transported.

The scum suction port provided with a blade for rotating by blowing air according to the first invention, the scum suction tube provided with a spiral rib on the inner surface according to the second invention, and the scum pulverizer according to the third invention. The blades may be used independently of each other, or any or all of them may be used in combination.

[0046]

As described above, the scum removing device of the present invention
A swirling water stream can be effectively generated on the surface of the sedimentation tank, and the scum of the floating scum is provided, so that the floating scum can be effectively crushed and even when the scum is thickly deposited. Since the scum suction port vibrates up and down while rotating sufficiently, the scum removing device has excellent scum removing efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a scum removing device according to a first embodiment of the present invention.

FIG. 2 (a) is an explanatory view of an example of a scum suction port of the present invention 1. (B) Explanatory drawing of another example of the scum suction port of this invention 1.

FIG. 3A is an explanatory view of a scum removing device according to the second embodiment of the present invention. (B) Explanatory drawing of the scum suction pipe of invention 2.

FIG. 4 is an explanatory view of a scum removing device according to a third embodiment of the present invention.

FIG. 5 is an explanatory view of an example of a scum suction port of the third invention.

FIG. 6 is an explanatory view of a conventional scum removing device.

FIG. 7A is an explanatory view of an example of a conventional scum suction port. (B) Explanatory drawing of another example of the conventional scum suction port.

FIG. 8 is an explanatory sectional view of an example of a scum suction port of the present invention and a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scum suction port 2 Flange 21 Rotation assistance blade 211 Rotation assistance blade support 212 Air ejection nozzle 22 Ridge 23 Perpendicular line 24 Tangent line 25 Substantially triangular surface 26 Water flow lower surface 27 Scum crushing blade 271 Scum crushing blade support 4 Scum Suction pipe 41 Spiral rib 5 Floating 6 Scum transfer pipe 7 Air pipe 8 Air lift pump 9 Air jet port A Air B Floating scum C Recovery scum WL Water surface

Claims (3)

[Claims] 1. A scum removing device used in a sedimentation tank of a wastewater treatment device, wherein a scum suction port provided with a blade for rotating by blowing air is connected to a scum suction pipe arranged below the scum suction tube. A scum removing device, which is rotatably connected, and wherein water in a scum suction pipe is transferred by an air lift pump. 2. A scum removal device used in a settling tank of a wastewater treatment device, wherein a scum suction port is rotatably connected to a scum suction pipe provided with a spiral rib on an inner surface disposed below the scum suction port. A scum removing device, wherein water in a scum suction pipe is transferred by an air lift pump. 3. A scum removal device used in a sedimentation tank of a wastewater treatment device, wherein a scum suction port is provided below a scum suction port having blades for smashing scum on the water surface by rotating the scum suction device. A scum removal device, wherein the scum suction tube is rotatably connected to the scum suction tube and water in the scum suction tube is transferred by an air lift pump.