JPS6140328Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a simple sludge dewatering device for further sludge dehydration treatment of waste sewage in a sewage treatment facility, etc., and for reducing the treated liquid.

Conventionally, in this type of sludge dewatering equipment, the liquid to be dehydrated is poured onto a filter cloth that is run by a carrier roller, and a vacuum device is used to forcibly perform vacuum filtration and dewatering while the filter cloth is running. There are known dehydrators that use a roll press dehydrator with squeezing rollers and those that use a so-called basket-type centrifugal dehydrator.

However, in all of these, the heart of the dehydrator itself is expensive and requires a large-scale drive mechanism. The latter also requires special pretreatment equipment by using a centrifugal dehydrator.

The present invention proposes a sludge dewatering device that can be miniaturized and provided at low cost, and can be made to easily dewater sludge without requiring special accessories or special pre-treatment equipment like conventional dehydrators. It is something.

That is, the present invention includes a stock solution suction tank, a vacuum pump that evacuates the stock solution in order to suck the stock solution into the stock solution suction tank, a mixer, and an internal component for feeding the stock solution in the stock solution suction tank to the mixer. A pump for introducing the stock solution installed in the pump, a flocculating liquid tank, a pump for introducing the flocculating liquid that sends the flocculating liquid in the flocculating liquid tank to the mixer, and a mixed liquid mixed in the mixer are introduced. A separation/concentration tank for sedimentation separation, a cylindrical front-stage mesh, and a similarly cylindrical rear-stage mesh with larger openings are connected in series, and spiral feeding fins are provided on the inner peripheral surfaces of both of these meshes. It is characterized by comprising a rotary screen for introducing the precipitate precipitated in the separation concentration tank from the front mesh side, and a screen rotation mechanism for rotating the rotary screen.

The illustrated embodiment in which the present invention is applied to a sludge dewatering vehicle will be described in detail below.

As shown in FIG. 1, the entire sludge dewatering apparatus is mounted on a loading platform 2 of a truck 1. As shown in FIG.

That is, a flat treated water tank 3 is mounted on the loading platform 2, and on this tank 3, a sedimentation separation/dehydration machine 4, a raw solution suction tank 5 (FIG. 2), and a flocculating liquid tank 6 are installed.

The treated water tank 3 is divided into a drainage chamber 3a at the front, a treated water storage chamber 3b at the center, and a treated cake chamber 3c at the rear.

The sedimentation separation/dehydration machine 4 has a separation concentration tank 8 disposed at the front end of a frame 7, and a rotary screen 9 mounted within the frame 7 to form one unit.

As shown in FIGS. 1 and 2, the separation/concentration tank 8 is tapered toward the lower end, and has a filtration chamber 10 formed on one side thereof.

The rotary screen 9 consists of a cylindrical front-stage mesh 9a and a cylindrical rear-stage mesh 9b with larger meshes, which are continuous in series, and a spirally continuous mesh on the inner peripheral surface of both meshes 9a, 9b. A feed fin 11 is provided. The mesh size of the front mesh 9a and the rear mesh 9b is, for example, about 40 mesh for the former and 20 mesh for the latter.
It has become ~30 years old.

The rotary screen 9 has the first and second
As shown in the figure, the separation and concentration tank is rotatably supported by a group of rollers 13 supported by a shaft rod 12 and tilted upward from the front mesh 9a side to the rear mesh 9b side. The screen can be rotated by a screen rotation mechanism located below the screen.

That is, the rotary screen 9 is linked to a motor 16 via a chain 14 and a reduction gear 15, and is rotated by the drive of the motor 16.

As shown in FIG. 2, the stock solution suction tank 5 is connected to a vacuum pump 17, and the inside is evacuated by the vacuum pump 17, so that the suction pipe 18
The undiluted solution can be inhaled through the tube.

A stock solution introduction pump 19, which is a so-called submersible pump, is installed in the stock solution suction tank 5.
The stock solution sucked into the stock solution suction tank 5 is sent to the line mixer 20 by this pump 19.

On the other hand, the flocculating liquid in the flocculating liquid tank 6 is also sent to the line mixer 20 by the flocculating liquid introduction pump 21 and mixed with the stock solution.

The liquid mixture thus mixed is sent into the separation/concentration tank 8, where it is separated into a precipitate and a supernatant liquid (treated water).

The sediment enters the front end of the rotary screen 9 through a sediment transfer pipe 22 connected to the lower end of the separation and concentration tank 8, and the supernatant liquid that enters the filtration chamber 10 flows into the treated water storage chamber 3b of the treated water tank 3 through a treated water transfer pipe 23.

The sediment that has entered the rotary screen 9 is
First, the water is dehydrated by the small-mesh front mesh 9a and sent into the large-mesh rear mesh 9b by the feed fin 11, and then further transferred by the feed fin 11 while being dehydrated by the latter mesh 9b. Treated water tank 3
into the processing cake chamber 30. Here, the rotary screen 9 has a two-stage mesh structure with small meshes in the front stage and large meshes in the rear stage.
The precipitate that has entered the rotary screen 9 is dehydrated by the small-mesh front mesh 9a when the moisture content is high, and then dehydrated by the large-mesh rear mesh 9b when the moisture content is low and hardened. It has a good dehydration effect.

The water that has passed through the front mesh 9a and the rear mesh 9b flows down into the treated water storage chamber 3b through a funnel 24.

A cleaning pump 25 is installed above the treated water storage chamber 3b, and the water that enters here is sent to a sprinkler 26 by the cleaning pump 25, and is sprayed on the rotary screen 9, where it is used for cleaning. Ru.

The treated water that has overflowed the treated water storage chamber 3b flows into the drainage chamber 3a, and is discharged to the outside by a drainage pump 27 installed in the drainage chamber 3a.

As shown in FIG. 4, for example, the human waste inside the human waste septic tank 28 is sucked into the raw solution suction tank 5 through the hose 29, and the sucked human waste is sent to the line mixer 20 by the raw solution introduction pump 19. After mixing with the flocculating liquid from the flocculating liquid introducing pump 21, the flocculating liquid is introduced into the separation/concentration tank 8, where precipitation, concentration and separation are performed.

The precipitated sludge is introduced into the rotary screen 9, dehydrated therein, and stored in the treated cake chamber 3c.

On the other hand, the filtration chamber 10 and the rotary screen 9
The treated water that has passed through is temporarily stored in the treated water storage chamber 3b, and is circulated and used for cleaning the rotary screen 9, while being discharged to the outside by the drainage pump 27, for example, to an external water purification tank 30. After the water is purified, it is returned to the septic tank 28.

In the above embodiments, the present invention was applied to a sludge dewatering vehicle, but it goes without saying that the present invention may be permanently installed in a fixed sewage treatment facility on the ground.

As is clear from the detailed description above, the sludge dewatering device of the present invention mixes the raw solution and the flocculating solution in a mixer, then introduces it into a separation thickening tank where it is precipitated and separated, and then the precipitate is passed through a rotary screen. Unlike conventional methods, it does not require dedicated accessories or special pre-treatment equipment in addition to a dehydrator, so it can be provided easily and inexpensively, and the rotary screen has a two-stage mesh structure. Although it has a simple structure, it has a good dehydration effect.

Further, since the stock solution is vacuum-inhaled into the stock solution suction tank and then sent to the mixer by the pump installed in the stock solution suction tank, the stock solution can be efficiently introduced into the separation concentration tank.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a sludge dehydration vehicle. Fig. 1 is a simplified side view of the inventive device shown together with a truck, Fig. 2 is a plan view thereof, and Fig. 3 is a simplified side view of the inventive device shown together with a truck.
The figure is a rear view, and FIG. 4 is a float chart. 5... Raw solution suction tank, 17... Vacuum pump,
20...Mixer, 19...Pump for introducing stock solution, 6
...Aggregating liquid tank, 21...A pump for introducing a coagulating liquid, 8...Separation and concentration tank, 9, 9a, 9b...Rotary screen, its preceding mesh and subsequent mesh, 11...Feeding fin, 16...Rotary screen A motor that rotates.

Claims (1)

[Scope of utility model registration request] a undiluted solution suction tank; a vacuum pump that evacuates the undiluted solution in order to suck the undiluted solution into the undiluted solution suction tank;
a mixer, a pump for introducing the stock solution installed therein to feed the stock solution in the stock solution suction tank to the mixer, a flocculating liquid tank, and feeding the flocculating liquid in the flocculating liquid tank to the mixer. A pump for introducing the flocculating liquid, a separation/concentration tank for introducing the mixed liquid mixed in the mixer to precipitate and separate the liquid, a cylindrical front-stage mesh, and a similarly cylindrical rear-stage mesh with larger meshes are connected in series. A rotary screen which is connected to each other and has spiral feeding fins on the inner circumferential surface of both meshes, and which introduces the precipitate precipitated in the separation and concentration tank from the front mesh side, and a screen rotation mechanism which rotates this rotary screen. A sludge dewatering device characterized by comprising: