JPS6320018A - Concentrating and filtering device for sludge - Google Patents

Abstract

PURPOSE:To enhance the action for preventing the clogging of a cylindrical screen by rocking the cylindrical screen from side to side together with the rotating thereof and positioning a ropy rake member in the rotating screen. CONSTITUTION:The clogging of a cylindrical screen 12 is prevented and the effective sieving is performed by feeding a raw material being a required material to be treated from a feed box 23 for raw material so as to be projected on the inside face of the cylindrical screen to the inner face of the rear end of the cylindrical screen 12 which is provided by forward descending and slanting the screen face and consists of find holes and also rotating the cylindrical screen 12 while washing the inner face thereof and reciprocating it from side to side. Especially, in case of vertically providing a ropy rake member 24 in the inner face of the screen 12, the rake member 24 is allowed to meander in a plane corrugate shape by both the transfer of the inner face of the screen 12 due to the rotation and the movement of deposit forward transferring while vertically moving along the inner face of the screen 12 and is slid on the face thereof and therefore the effect for preventing the clogging of the cylindrical screen is further promoted.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is a method for treating general industrial wastewater and precipitated sludge from sewage treatment plants.
The present invention relates to a sludge concentration filtration device suitable as a pretreatment device for concentration treatment by mechanical concentration such as pressurized flotation and centrifugal concentration.

(Conventional technology) Sludge settled in a settling tank has a high water content (99,5
~98X), it is inefficient to directly transfer this to a digestion tank or dewatering process, and the equipment becomes large and uneconomical. Therefore, as a device for concentrating the sludge as much as possible to reduce its volume before sending it to the mechanical thickener, a gravity-type sludge thickener is generally used, which has a rotating rake in a circular tank and collects the settled sludge at the center of the bottom. However, in this case, concentration results in a moisture content of only about 96X, and there are inconveniences such as the need for a separate removal device to dispose of the scum floating on the water surface of the tank.

(Problems to be solved by the invention) For the above-mentioned sludge treatment, sludge IC1M is usually used! Although flocculation is carried out by adding a flocculating agent, the sludge that has been formed into flocculated blocks is fluff-like and soft and easy to break, and the particles contained in it are fine and highly viscous, so it cannot be used normally. Sieving is not possible with a vibrating sieve. On the other hand, a cylindrical sieve (trommel) can easily sieve soft sludge without damaging it, but a cylindrical sieve has a rotating circumferential sieve (a part of which serves as the sieving surface, so the processing capacity is The sieves are small, the equipment is large, and the sieves are often clogged, requiring a large amount of washing water.Moreover, there is a risk that this washing water will not pass through the sieves and will be mixed into the material on the sieves, increasing the moisture content. be.

(Means for solving the problem) To solve this problem, it is necessary to add a function to prevent clogging and a function to increase the effective area of the K sieve surface to the conventional cylindrical sieve. Therefore, if the cylindrical sieve is rotated and horizontally moved in the lateral direction, K will increase the contact area with the sieve surface and clean the sieve openings at the same time due to the movement of the processing liquid inside.

This invention was developed focusing on the above points, and the cylindrical sieve is made to swing from side to side as it rotates, and if necessary, a rope-shaped rake member is placed inside the rotating sieve to prevent clogging. This is a measure of improvement.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a base, which has a rectangular horizontal frame 3 with upper layers of pillars 2... An auxiliary frame 4 is provided to protrude upward from the outer surface.

Next, reference numeral 5 denotes a swing frame, and as shown in FIG. It is mounted on the horizontal frame 3 so that the front side (left side in the figure) is lower through the frame, and the front and rear frames 9 are placed above the inclined frame 6. A top frame 11 is provided that connects the lO and its upper part, and these front and rear frames 9
, 10 to support a cylindrical sieve 1''2.

As shown in FIG. 2, the cylindrical sieve 12 is made of a thin metal plate with a large number of micropores with an inner diameter of 0.2 mm and an outer diameter of 0.25 mm, and has a length of 150 mm and a diameter of 45 mm. It is formed by attaching a cylinder made of a perforated starch plate under tension in the front-rear direction inside a brush-shaped reinforcing frame 13, which is made up of circular rings and connecting bolts connecting the circular rings, and has sufficient strength even though it is a thin metal plate. is held in This cylindrical sieve 12 is rotatably supported by engaging the front and rear circular rings of the reinforcing frame 13 with four front and rear support rollers 14 .
A circular pulley 15 provided on the rear edge and a continuously variable transmission 17 connected to a motor 16 &C mounted on the top frame 11 are connected to a V
They are connected by a belt 18 and rotated at a low speed at an appropriate circumferential speed.

Next, 19 is a link connecting the base 1 and the swing frame 5,
Both ends are pivotally connected to the tip of a crankshaft 21 rotated by a deceleration motor 20 provided on one side of the base 1 and a protrusion 22 provided on the lower surface of the inclined frame 6 of the swing frame 5. The swing frame 5 is reciprocated in the left and right direction via the connecting rod 19.

Next, reference numeral 23 denotes a raw material supply box for supplying the necessary materials to be processed to the cylindrical sieve 12, which is made to have a wide shape in the front and back direction, and whose tip is approximately at the same height as the center of the cylindrical sieve 12. As the cylindrical sieve 12 rotates, the discharged material is attached to the swing frame 5 in close proximity to the inner surface of the sieve on the downward side.

Further, in the above embodiment, a rope-shaped rope having one end fixed to the rear end of the swing frame 5 having one end inside the cylindrical sieve 12 and a rope having a required thickness and length with the other end being a free end is used. A rake member 24 is vertically attached to the bottom surface of the sieve.

In the figure, reference numeral 25 denotes a chute for removing mesh material, which is located below the front end of the cylindrical sieve 12 and is fixed to the swing frame 5.
Reference numeral 6 denotes a cleaning pipe that is attached to the swing frame 5 and sprays water toward the inner surface of the sieve; 27 is the cleaning pipe 26 that is installed on the base 1;
2g is a washing water tank, and 29 is a receiver for taking out items under the screen.

(Operations and Effects) This invention is as shown in the above embodiment.
The cylindrical sieve 12 is rotated and reciprocated from side to side while cleaning the sieve inner surface while supplying raw material, which is the required processing material, to the inner surface of the rear end of the sieve 2 so as to be projected onto the inner surface thereof. It is possible to prevent clogging and perform efficient sieving, but %K.

When a rope-shaped rake member 24 is installed vertically on the inner surface of the sieve, movement of the inner surface of the sieve due to rotation and inner surface KG of the sieve
Due to the movement of the deposits moving forward while moving up and down, the rake member 24 snakes in a plane wave shape and rubs against the inner surface of the sieve, thereby further enhancing the effect of preventing clogging. In the embodiment, the cylindrical sieve 12 is formed by installing a straight cylinder on the inclined frame 6, but it goes without saying that a cylindrical sieve whose sieve surface is a conical slope may also be provided horizontally. . Further, the rake member 24 is not limited to a rope, but may be made of a large number of overlapping strips of cloth, for example, and may be made of any bendable material that has a certain degree of appearance.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, with FIG. 1 being a plan view, FIG. 2 being a side view, and FIG. 3 being a rear view. 1 is the base, 5 is the swinging frame, 7 and 8 are the front and rear rollers, +2
1 is a cylindrical sieve, 13 is a reinforcing frame, 14 is a support roller, 1
6 is a motor, 17 is a continuously variable transmission, 19 is a continuous rod, 20 is a reduction motor, 21 is a crankshaft, 23 is a raw material supply box,
24 is a rake member, 25 is a chute for taking out items on the net, 2
Reference numeral 6 indicates a cleaning pipe, and 29 indicates a receptacle for taking out items under the screen.

Claims (1)

[Claims] 1. A swinging frame is mounted on a base so as to repeatedly move back and forth within a certain range from side to side via an appropriate swinging mechanism provided on the base, and this swinging frame is A cylindrical sieve dotted with fine holes is mounted on the pedestal with the sieve surface tilted forward and downward slightly, and the rocking pedestal has a mechanism for rotating the cylindrical sieve, a raw material supply box, and a water sprinkling inside the sieve. A sludge thickening filtration device characterized by being equipped with a cleaning pipe, a chute for taking out netted material, etc. 2. A swinging frame is mounted on the base so that it can repeatedly move back and forth within a certain range from side to side via an appropriate swinging mechanism provided on the base, and this swinging frame is equipped with micro holes. A dotted cylindrical sieve is installed with the sieve surface tilted forward and downward slightly, and the rocking stand is equipped with a mechanism for rotating the cylindrical sieve, a raw material supply box, a cleaning pipe for sprinkling water into the sieve, and a screen material. A chute for taking out, etc. is provided, and a rope-shaped rake member of the required length is installed inside the cylindrical sieve and runs along the bottom surface of the sieve, and one end of the rake member is fixed to the rear end of the swinging frame so that it can be moved left and right. A sludge thickening filtration device characterized by being installed in multiple layers.