JP3130743B2 - Washing equipment for sedimentation separation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to liquids, in particular water, sewage,
The present invention relates to a cleaning device for a device that sediments and separates suspended particles from a liquid to be treated containing suspended particles by using a difference in specific gravity between the two in the treatment of wastewater or the like.

[0002]

2. Description of the Related Art The generation of a turbulent flow which hinders the settling of suspended particles from a flowing liquid to be treated is prevented, and the suspended particles in the liquid are deposited at the bottom of a basin. In order to improve the clarity of the separation liquid and shorten the separation time by reducing the distance that must be lowered, a large number of elongated tubular passages are regularly arranged in a fixed cross section. A slanted tube sedimentation / separation device is known in which a group of densely arranged parallel to each other is inclined and arranged in a sedimentation tank, and a liquid to be treated flows through the tube-shaped group of aggregates (for example, Tokiko Sho 55-37
927). This inclined tube sedimentation separation device is used for both sedimentation separation of suspended particles having a higher specific gravity than liquid and flotation separation of particles having a lower specific gravity than liquid, and in many cases, suspended solids are solid fine particles. .

Next, in order to facilitate understanding of the present invention,
Regarding the conventional inclined tube sedimentation and separation apparatus described in Japanese Patent Publication No. 55-37927, a case where a suspended substance of solid fine particles having a higher specific gravity is sedimented and separated from the liquid to be treated, with reference to FIG. I will explain it.

In FIG. 5, a chemical flocculant is added to raw water containing suspended particles, and the mixture is stirred and mixed. The mixture is introduced into a floc forming tank 21, and the floc of the flocculant is combined with the suspended fine particles to have a specific gravity. The raw water is led to the inflow end of the inclined pipe sedimentation / separation device 22. The inclined tube sedimentation / separation device 22 is a device in which a large number of elongated tubular passages are arranged parallel to each other under a regular arrangement of a fixed tube cross section, and a dense assembly is arranged at an angle α to the horizontal. The raw water diverges obliquely upward through each of the tubular passages of the sedimentation / separation device 22, during which the flocs combined with the suspended particles settle, and the inclination angle α is set to an angle larger than the angle of repose of the sedimented material. Therefore, the sedimented substance slides down on the bottom surface of the pipe in the direction opposite to the liquid flow, is discharged at the inflow end of the inclined pipe sedimentation / separation device 22, is collected in the lower part of the sludge collection tank 23, and is periodically or continuously. To be removed from there. On the other hand, the clarified liquid flowing out from the upper end of the inclined pipe sedimentation / separation device 22 is collected in the container 24 and sent out therefrom.

[0005] As described above, in the inclined tube sedimentation / separation apparatus, the flow of raw water is generally divided into a large number of tubular passages, so that a rectifying effect on the liquid flow, a reduction in the settling distance of the suspended particles, and an increase in the settling area. In order to achieve effective sedimentation and separation of suspended particles in the liquid flow, turbulence of the liquid flow in the tubular passage must be avoided in order to achieve effective separation of suspended particles in the liquid flow . This is because sedimentation of suspended particles is significantly inhibited under turbulent conditions. Therefore, as shown in FIG. 6, the present applicant has previously described a sedimentation / separation device having a structure that is easy to assemble, hardly deforms, and smoothly separates sedimentary substances, as shown in FIG. (Japanese Patent Application No. 5-334331).

However, in such an inclined tube sedimentation / separation apparatus, sludge and attached algae resulting from the sedimentation of suspended substances that have not been settled and separated gradually on the surface of the inclined tube over a period of use are washed at an appropriate timing. Otherwise, the passage may be blocked, causing a drift, and an effective separation operation may not be performed. In particular, washing must be performed frequently during the period when algae are likely to occur, such as in summer. As this cleaning method, for example, the following method is known.

Japanese Patent Application Laid-Open No. 52-82862 discloses that the flow of raw water is stopped, the raw water in a sedimentation tank is jetted between inclined plates by a jet generator, and the jet flow and convection are accumulated in the inclined plate sedimentation device. There is disclosed an invention relating to a method for cleaning an inclined plate sedimentation apparatus, which is characterized by forcibly separating sludge and attached microorganisms, and an apparatus relating to the method. However, in this case, it is necessary to suspend the sedimentation separation operation during the washing operation. Further, in order to obtain a certain cleaning effect, it is necessary to increase the capacity of the pump for generating the jet flow to some extent. If the pump is large, the discharge flow may be disturbed and the cleaning may not be performed uniformly.

Japanese Patent Application Laid-Open No. 52-135461 discloses that a water injection nozzle and a water suction pipe arranged along a row of layers can be integrally moved above an inclined plate of an inclined plate type sedimentation / separation device. Disclosed is an invention relating to a self-cleaning device for an inclined plate type sedimentation separation device, which is disposed and removes and cleans sludge adhering to the inclined plate surface. However, in this method, the equipment cost of the traveling trolley, the submersible pump, and the like is high, and the maintenance and inspection work of the mechanical equipment such as the trolley and the pump is periodically required. In addition, it is necessary to suspend the sedimentation and separation operation during the washing operation.

Further, Japanese Patent Application Laid-Open No. Sho 62-79814 discloses a method in which a support bracket is provided to be suspended or supported on a girder in a sedimentation basin, and a vibrator is mounted on the support bracket. There is disclosed an invention relating to a method and an apparatus for cleaning an inclined sedimentation apparatus, wherein sludge adhering to the apparatus is automatically removed. However, in this method, the mechanical vibration of the vibrator is transmitted to the inclined sedimentation device via the support fitting, so that it is necessary to increase the strength of the members supporting these, and the equipment cost increases.

[0010] The present invention has been made in view of such problems of the prior art, and an object thereof is to enable efficient and uniform cleaning without interrupting the sedimentation / separation operation. An object of the present invention is to provide a low-cost settling / separation apparatus cleaning apparatus.

[0011]

In order to achieve the above object, the present invention provides a method for converting both suspended particles from a liquid to be treated containing suspended particles flowing through an inclined plate or inclined tube installed in a settling tank. A sedimentation separation apparatus for sedimentation separation using a specific gravity difference, wherein a bogie for scraping sludge is provided at the bottom of the sedimentation tank so as to be able to run freely, and the bogie can be moved together with the bogie. The first invention is a sedimentation / separation device cleaning device characterized by having an air diffuser having a large number of air discharge ports, and in the first invention,
A sedimentation separation device, wherein a short pipe is inserted into the diffuser from the air discharge port, and a small hole for air inflow is formed in the short pipe so as to be lower than the top position of the inner wall of the diffuser. The washing apparatus according to the second aspect of the present invention, in which the suspended particles are settled from the liquid to be treated containing the suspended particles by utilizing the difference in the specific gravity of the liquid to be treated, which flows through the inclined plate or the inclined tube installed in the sedimentation tank. A washing device used for a separation device, comprising: a carriage that can travel on the bottom of the sedimentation tank; and an air diffuser having a large number of air discharge ports that can move together with the carriage. A third aspect of the present invention is a washing apparatus for a sedimentation separation device, wherein a short pipe is inserted into the pipe, and a small hole for air inflow is formed in the short pipe so as to be lower than the top position of the inner wall of the diffuser pipe. And

[0012]

The sedimentation and separation operation is interrupted by discharging a predetermined amount of air from an air diffuser provided on a truck capable of scraping sludge accumulated at the bottom while constantly running at the constant speed at the bottom of the sedimentation tank. Without removing sludge and algae attached and deposited on the surface of the inclined plate or inclined tube. Water in the diffuser is supplied to the diffuser by forming a small hole for air inflow in the short pipe inserted into the diffuser from the air discharge port so that it is lower than the top position of the inner wall of the diffuser. Only after the water is pushed down by the pressure of the air and the water level falls below the level of the stoma, the air flows into the short pipe.
After that, a predetermined amount of air necessary for cleaning the inside of the inclined plate or the inclined pipe must be supplied into the diffuser pipe,
The air supplied at that time receives resistance when passing through the small hole, and the amount of air supplied to the diffuser tube is larger than the amount of air discharged from the small hole, so the pressure in the diffuser tube increases, The water level in the air diffuser falls further and stabilizes at a constant water level. At this time, all the small holes are located above the water surface in the air diffuser, so that even if there is some error in the installation level of the gas diffuser, air can be uniformly discharged from the plural small holes of the gas diffuser. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a sedimentation tank. In FIG. 1, reference numeral 1 denotes a bogie that can freely travel along the bottom of the sedimentation tank along the direction of the arrow to scrape sludge. 2
Is an air hose for supplying high-pressure air. The air hose is guided by a cable carrier 4 which is a hose supporting and guiding device disposed in a guide rail 3 laid along substantially the center of the sedimentation tank. At the same time, it can move in the settling tank in the direction of the arrow. Reference numeral 5 denotes a plurality of inclined pipes, in which the water to be treated containing suspended particles flows upward from below in the inclined pipe, and the suspended particles are settled and separated.

FIG. 2 is a plan view of the sedimentation tank without the inclined tube. In FIG. 2, reference numeral 6 denotes an air diffuser attached to the truck 1, the details of which are as shown in FIG. In FIG.
The end of the air hose is connected to the diffuser 6 as indicated by an arrow 7, and the air that has flowed into the diffuser 6 via the air hose is discharged upward from the short pipe 11. The amount of air supplied is 3 L / min. Per one short pipe 11. It should be noted that the greater the amount of air supplied, the greater the amount of air colliding with the inclined tube, and the better the cleaning effect. However, if the amount of air is more than 5 L / min. Per one of the short pipes 11, a large amount of air bubbles collide with the inclined pipe, and the inclined pipe may be excessively vibrated and damaged, and furthermore, the air supply more than necessary. Power is required, leading to increased running costs. If the flow rate is less than 1 L / min., The amount of air colliding with the inclined tube is reduced, so that an appropriate vibration cannot be given to the inclined tube, and the cleaning effect is reduced. Further, since the pressure of the air in the air diffuser is reduced, the water level in the air diffuser rises, and some small holes are submerged, so that air cannot be uniformly discharged from all the small holes. Therefore, the amount of air supplied is one of the short pipes 11.
It is preferably 1 L / min. To 5 L / min. Diffuser 6
As shown in FIG. 4B, in the method of discharging air from the air diffuser 6 through an air discharge port 9 formed at the top of the diffuser 6, the pulsation 10 of water in the diffuser 6 is severe. In some cases, the air discharge ports are blocked by water, and the air cannot be discharged uniformly from the plurality of air discharge ports.

However, as shown in FIG. 4A, a short pipe 11 is inserted into the air diffuser 6 from the air discharge port 9 and
A small hole 1 is located below the top of the inner wall of the diffuser tube.
2 is formed and air is allowed to flow into the short pipe 11 through the small holes 12, so that the water surface in the diffusion pipe 6 is pushed down by the pressure of the air supplied into the diffusion pipe 6. Only after this water level falls below the level of the upper small hole 12 does air flow into the short pipe 11. Therefore, as shown in FIG. 4B, there is no strong pulsation of water in the air diffuser 6.
As shown in FIG. 4A, the water surface level in the air diffuser 6 is substantially horizontal.

As a result, air can be uniformly discharged from the plurality of short tubes 11 as described in the section of operation.

When the pressure of the air flowing into the air diffuser 6 is considerably high, the water surface is pushed down to the level of the small holes 12 at the lower part. Air flows into the air. In the present embodiment, the short tube 11 is provided with two small holes including the upper small hole and the lower small hole, but the number of small holes is not limited to this, and may be one or three or more. That is, a small hole may be provided in the short tube 11 so that the air receives resistance when passing through the small hole.

As shown in the present embodiment, the washing apparatus for a sedimentation / separation apparatus of the present invention not only cleans an inclined pipe through which water to be treated is passed upward from below, but also cleans the water to be treated from above. It is also possible to wash a sloped pipe that passes downward, or a sloped plate that horizontally passes water to be treated.

[0019]

Since the present invention is configured as described above, the following effects can be obtained. According to the first aspect of the present invention, it is only necessary to attach an air diffuser to an existing truck, so that equipment costs can be reduced. Because it is good, equipment costs can be reduced.

Further, since the washing point is limited on the air diffuser, the range of the roll-up of the flocks or the like is local,
Since the amount of the wound up flocks is small, the quality of the treated water is not deteriorated even if it is mixed in the treated water, so that it is possible to wash while continuing the sedimentation and separation work.

Furthermore, since the cleaning is performed while the air diffuser moves with the carriage, the entire inclined pipe can be cleaned without using a large amount of air at a time. In addition, an effect that a relatively small amount of air is required and the required power is reduced can be expected.

According to the second and third aspects of the present invention, the variation in the air discharged from each air discharge port of the air diffuser is reduced, so that the cleaning efficiency is further improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a sedimentation tank.

FIG. 2 is a plan view of the sedimentation tank without an inclined tube.

FIG. 3 is a front view of the air diffuser according to the present invention.

FIG. 4 (a) is a side sectional view showing a state in which a short pipe having a small hole is inserted into an air diffuser from an air discharge port, and FIG. 4 (b).
FIG. 4 is a side sectional view showing a case where an air discharge port is provided at the top of an air diffuser.

FIG. 5 is a schematic configuration diagram of a conventional inclined pipe sedimentation separation apparatus.

FIG. 6 is a view showing a cross section of a tubular passage of a conventional inclined pipe sedimentation separation apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dolly 5 ... Inclined pipe 6 ... Diffusion pipe 9 ... Air discharge port 11 ... Short pipe 12 ... Small hole

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-63321 (JP, A) JP-A-63-1408 (JP, A) JP-A-57-48309 (JP, A) JP-A 55-48 18227 (JP, A) Japanese Utility Model Showa 56-34507 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 21/00-21/34

Claims (3)

(57) [Claims] The present invention is applied to a sedimentation / separation apparatus which sediments and separates suspended particles from a liquid to be treated containing suspended particles by using a specific gravity difference between the liquids to be treated, which flows through an inclined plate or inclined tube installed in a sedimentation tank. A washing device, which is provided with a sludge on the bottom of the sedimentation tank.
A washing device for a sedimentation separation device, comprising: a carriage for scraping a jig, which is provided so as to be freely movable, and the carriage having an air diffuser having a large number of air discharge ports capable of moving together with the carriage . 2. A short pipe is inserted from the air discharge port into the diffuser pipe, and a small hole for air inflow is formed in the short pipe so as to be lower than the top position of the inner wall of the diffuser pipe. The washing device for a sedimentation separation device according to claim 1. 3. A sedimentation / separation apparatus which sediments and separates suspended particles from a liquid to be treated, which contains suspended particles, through a slant plate or a slant tube installed in a sedimentation tank by utilizing a specific gravity difference between the two. a cleaning apparatus, the carriage freely traveling bottom of the settling tank, comprising a diffuser tube having a number of air discharge opening which can be moved together with the該台vehicle, from the air discharge port
A short tube is inserted into the diffuser tube, and the short tube is placed at the top of the inner wall of the diffuser tube.
Small holes for air inflow are formed below
And a washing device for a sedimentation separation device.