JPS6146163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a device for dewatering sludge with a relatively high water content, such as sludge, etc., and an object thereof is to have an excellent dewatering function and to be able to dewater continuously and efficiently. The goal is to provide a device that is

Sludge dewatering treatment methods include centrifugation, sedimentation, adsorption to cloth or strainer surfaces, and the present invention utilizes adsorption means to cloth surfaces or strainer surfaces. Conventional sludge dewatering equipment of this type has a low adsorption amount and a low dewatering amount due to adsorption loss on the adsorption surface and poor vacuum formation and maintenance, resulting in extremely low treatment efficiency.

The device of the present invention solves these drawbacks, and has a storage box on which sludge water is stored at a predetermined level through sludge supply and overflow.
A rotating drum is equipped with a suction tube for sucking internal fluid using its rotating circumferential surface as a strainer, and is rotatably supported at a position where the rotating circumferential surface of the rotating drum passes below the level of the fastening box. A ventilation prevention cover whose terminal end is below the level is slid on the peripheral surface of the entrance below the level. A sludge dewatering device is characterized in that the adsorbed sludge is peeled off and removed on the surface of a detoured cloth belt, and the other end of the suction pipe is connected to the suction side of a vacuum generator using a jet pump. The summary is as follows, and the explanation using the illustrated example is as follows.

FIG. 1 shows a case where a scraper plate 3 is provided at the starting end of a ventilation prevention cover 2 that is in sliding contact with the circumferential surface of a rotating drum 1, and the adsorbed sludge is peeled off and removed at this part.

That is, the rotary drum 1 is fixed in opposition to the disks 5, 5' having a support shaft 4 and a hollow support shaft 4' projecting therebetween, sandwiching a strainer 6 which serves as a rotating surface, and a sprocket 7 is attached to the support shaft 4. This is the configuration. Power is transmitted to the sprocket 7 from a variable speed drive source (not shown).

The retainer box 8 is dish-shaped with a relatively shallow upper opening, and is provided with an overflow port 10 on one side for forming a predetermined sewage level 9.

Reference numeral 11 denotes a frame that supports the rotating drum 1 and the retaining box 8 in such a manner that the rotating peripheral surface of the rotating drum 1 passes below the sewage level 9 of the retaining box 8; Along the circumferential surface of the lower entryway 12, a member having low frictional resistance, such as a ventilation prevention cover 2 made of Teflon (registered trademark), and a scraper plate 3 at the starting end of the ventilation prevention cover 2 are supported.

The ventilation prevention cover 2 is in sliding contact with the rotating circumferential surface of the rotary drum 1 in such a range that its starting end is above the opening edge of the fastening box 8 and its terminal end is below the level 9 of the dirty water.

Reference numeral 13 denotes a suction pipe, which connects the water suction port 14 at one end to the rotary drum 1 through the hollow support shaft 4' of the rotary drum 1.
The other end is piped to the vacuum generator 25.

15 is a sludge tank, and a sewage supply pipe 16 that supplies sewage to the storage box 8 by a pump P;
A condensate pipe 17 is provided which is piped to an overflow port 10 of the retention box 8.

The vacuum source 25 (FIG. 2) is connected to a water suction pipe at the top of a suction water tank 29 which has a discharge section 28 equipped with a discharge pump 27 using a jet nozzle 34 at the bottom via a mud discharge valve 26. A jet pump is equipped with a piping port 30 and a pump connection port 31, and the pump connection port 31 has a protective tube 35 connected to a joint between a suction pipe 32 and a discharge pipe 33 and connected to a jet nozzle 34 toward the center of the discharge pipe 33. 36 suction pipes 32 are connected to the pump 3 from the water supply tank 37.
Water made into high-pressure water at step 8 is supplied to the nozzle 34, and the end of the discharge pipe 33 reaches a water supply tank 37. Reference numeral 39 denotes an air introduction pipe connected to the protection tube 35, which can be opened and closed.

Note that the ventilation prevention cover 2 wears out due to sliding contact with the rotating circumferential surface of the rotating drum, but as shown in FIG. It is preferable to hold it in a frame or the like.

In the embodiment shown in FIG. 3, a cloth belt 18 is hung around the strainer 6 on the rotating circumferential surface of the rotating drum 1, and the ventilation prevention cover 2 is in sliding contact with the rotating drum circumferential surface on the lower level entry side 12. At the starting end,
The cloth belt 18 separates from the rotating circumferential surface, and the detour roll 1
9, 20, and 21, and is wrapped around the rotating peripheral surface of the rotary drum 1 at the terminal end of the ventilation prevention cover 2, and the adsorbed sludge is removed by changing the curvature of the surface of the detour roll 19 or by using the scraping plate 3. It is.

In addition to the embodiment shown in FIG. 2, the vacuum generator 25 has a structure in which the suction pipe 13 of the rotary drum 1 is directly connected to the suction pipe 32 of the jet pump 36, as shown in FIG. 5, or a high-pressure generator as shown in FIG. The pump 45 for water supply is provided in the separation tank 47, the discharge pipe 33 of the jet pump 36 is exposed into the separation tank 47, and the suction pipe 10 of the rotating drum 1 is connected to the suction pipe 32 of the jet pump 36. In some cases.

The embodiment of the device of the present invention and specific examples of its respective parts have been illustrated and explained above, and the operation thereof will be explained below with reference to FIGS. 1 and 2.

That is, when the apparatus of the present invention supplies sludge from the sludge tank 15 to the retention box 8, the vacuum source 25 is first activated to create a vacuum inside the rotating drum 1. Since the strainer 6 is in a ventilated state at the time of startup, a non-breathable strip material is adsorbed, and this strip material is removed while adsorbing sludge, and when the entire circumference is covered with sludge, the rotation of the rotating drum 1 is continued. Start the rotation. The sludge adsorbed by the strainer 6 absorbs water during one rotation, is peeled off by the scraping plate 3 provided at the starting end of the ventilation prevention cover 2, and is transferred from the dehydrated sludge chute to a predetermined position by a conveyor. . The strainer surface from which the adsorbed sludge has been removed becomes ventilated, but the scraping plate 3
Since the ventilation prevention cover 2 is slidably contacted from immediately after to below the level 9 of the retaining box 8, it absorbs the sludge and adsorbs the sludge without causing a decrease in the degree of vacuum inside the rotating drum 1. The dirty water sucked into the rotating drum 1 is sucked into the water absorption tank 29. This water absorption tank 29 is always maintained at a degree of vacuum close to absolute vacuum. This is due to the action of the jet pump 36 provided at the upper part of the water suction tank 29, and when the high pressure water jetted from the jet nozzle 34 rushes into the discharge pipe 33 from the protection pipe 35 equipped with the air introduction pipe 39. The air enters the air without causing cavitation due to the introduced air.
That is, since the fuel is injected with little energy loss, an extremely high discharge vacuum pressure is generated within the suction tube 32. For this reason, it is not necessary to use the water absorption tank 29.
The water suction pipe piping port 30 in FIG.
The fourth pump is configured to be directly connected to the pump connection port 31.
It may be as shown in FIG.

As described above, in the device of the present invention, a ventilation prevention cover is placed in sliding contact with the peripheral surface of the rotating drum where the sewage enters, and an adsorption sludge removal means is provided at the starting end of the cover, and the terminating end is below the sewage level of the retention box. , the vacuum loss is eliminated, and the strong suction continues the dehydration action, resulting in excellent dehydration effects. Since such an excellent dewatering effect is continuously maintained by the rotation of the rotating drum, the sludge dewatering efficiency is significantly improved. In addition, since the circumferential surface of the rotating drum is made of a strainer or a strainer and a cloth belt, and the suction force is applied by vacuum pressure from within the rotating drum, the interior of the rotating drum is simple with no partitions, etc., and the overall The device structure is extremely simple, making it an optimal processing device both in terms of manufacturing and maintenance.

[Brief explanation of the drawing]

The drawings show an example of the present invention device and each part, and Fig. 1 is a schematic diagram of the configuration, Fig. 2 is a cross-sectional view of the device combined with a vacuum generator, Fig. 3 is an example using a cloth belt, and Fig. 4 is an example of ventilation. FIGS. 5 and 6 are schematic diagrams showing other examples of the vacuum generating device and its relationship, in which the protective cover is adapted to wear. 1... Rotating drum, 2... Ventilation prevention cover, 3
...Scraper board, 6...Strainer, 8...Block box, 9...
...Level, 12...Entry side, 13...Water intake pipe,
25...Vacuum generator.

Claims (1)

[Claims] 1. On a storage box that stores sludge water at a predetermined level through sludge supply and overflow,
A rotating drum is equipped with a suction tube for sucking internal fluid using its rotating circumferential surface as a strainer, and is rotatably supported at a position where the rotating circumferential surface of the rotating drum passes below the level of the fastening box. A ventilation prevention cover whose terminal end is below the level is slid on the peripheral surface of the entrance below the level. A sludge dewatering device configured to peel and remove adsorbed sludge on the surface of a detoured cloth belt, and characterized in that the other end of a suction pipe is connected directly to the suction side of a jet pump or via a vacuum tank. .