JPS6338959Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a contact material device for a contact aeration tank.

Conventionally, various improvements have been made to this contact material device, but to point out the shortcomings by citing one example, here is a method in which a single flat mesh body is attached to a rectangular holding frame, and the upper end of this holding frame is In a contact material device in which a horizontal suspension rod is fixed to the tank body and the suspension rod is hooked to a suspension frame installed on the top of the tank body for hanging, each flat mesh body has a holding frame and a suspension rod. The retaining rods become unique and must be prepared in proportion to the number of flat mesh bodies, which increases the number of parts and is disadvantageous in terms of material costs, working time, and space. However, since the overall suspension load is large, the mechanical strength of the suspension frame must also be considered. Furthermore, since solid (non-porous) holding rods and suspension rods were used that did not allow water to pass through, water tended to stagnate around these rods, resulting in partial accumulation of sludge flocs. Another drawback is that the water may not fall down or the convection flow of water may be partially distorted or obstructed by these rods.

The present invention is an improvement of the above, and will be described in detail below with reference to preferred embodiments. In the drawings, Fig. 1 is a schematic side view showing one embodiment of a contact aeration tank including the device of the present invention, Fig. 2 is an enlarged perspective view showing one of the contact materials of the present invention, and Fig. 3 is an enlarged vertical sectional view of the lower holding frame. The contact material device of the contact aeration tank of the present invention is
A contact material 2 is made of a number of cylindrical synthetic resin net contact material bodies 1 with mesh sizes of 10 to 40 mm arranged adjacent to each other in a raft-like configuration, and the contact material 2 is suspended from a suspension frame 4 installed on the top of the tank body 3 by a pair of left and right suspension rods 5.
The net is preferably made of a synthetic resin, for example, a polyolefin net such as polyethylene or polypropylene, or a polyvinyl chloride net, which is light in weight and inexpensive to supply.
The reason for this is that if it is less than 10 mm, it will easily become clogged, the water flow will become poor, and it will tend to stagnate.
If the contact area exceeds this value, the contact area becomes small and it becomes difficult to obtain the desired effect.
The wires 9, 10 (here, iron wires coated with polyvinyl chloride) are inserted through the mesh of the wires 1, 2, 3, 4, 5, 6, 7, 8, and 9, 10, respectively, and are connected adjacent to each other. The uppermost and lowermost retaining frames 7, 8 are made of corrosion-resistant steel, and the wires 9, 10 are held in place by being inserted and secured at their upper ends in or engaged with the through holes 70, 70 provided in the upper retaining frame 7. The retaining frame 7 prevents the contact materials 2 from floating up. The lower retaining frame 8, as shown in FIG. 3, is made up of a pair of plate-like frame rods 81, 82, one at the front and one at the rear.
The wires 9 and 10 are held at a distance by a bolt 83.
The wires 9, 10 are connected by hanging them on the frame rods 81, 82, 83, in order to facilitate the removal of the wires 9, 10 from the lower holding frame 8, and to make it convenient to connect a new element to this position to increase the vertical length of the contact member 2, or conversely, to pull out the element to shorten the length.
After passing through the gap between the frame rods 81, 82, the wires may be wound around the frame rods 81, 82. When the frame rods 81, 82 are made of metal, they function to prevent the contact material 2 from floating up. The skewering wires 9, 10 can be assembled by simply passing them through the mesh of each element body 1. As an example of suspending the hanging rods 5, 6 from the suspension frame 4, the figure shows a connecting rod 11 installed on the upper ends of the hanging rods 5, 6, which are extended on both sides to provide downward hooks 12, 13,
The hooks 12, 13 are hooked into hook holes 14, 15 provided along the longitudinal direction of the suspension frame 4. It is preferable that the suspension rods 5, 6 and the connecting rod 11 are all made of corrosion-resistant steel wire. The cylindrical shape of the net can be a triangular or polygonal tube in addition to the cylinder shown in the figure.

As described above, the present invention provides a contact material body 1 which is made of a cylindrical net instead of a conventional flat net as the contact material 2.
Because we applied a raft-shaped structure, the first
For the same vertical and horizontal dimensions and shape, the contact area with water is much larger than that of conventional ones.Secondly, water can freely enter and exit in the entire circumferential direction through the eyes of each element. As a result, it is possible to promote the occurrence of local water turbulence, allowing more water to come into contact with the activated sludge, and to prevent the sludge that has grown into flocs of an appropriate size from stagnation in the tank due to the turbulence. being forced to fall to the bottom,
Thirdly, since the contact surface of the contact material 2 with respect to the pair of hanging rods 5 and 6 is large as described above, if the area of the entire contact material 2 is the same as that of the conventional flat net, Excellent practical effects such as being able to reduce the number of pairs of rods 5 and 6 and reducing the labor involved in attaching and detaching the contact members 2 can be obtained. Moreover, the cylindrical net element body 1
Since it is made of synthetic resin, it is lightweight, which further contributes to the reduction of such work labor, and it is also advantageous in terms of equipment costs because it can be supplied at low cost. In particular, in the case of the present invention, a large number of contact material bodies made of cylindrical net are connected by wire rods inserted through the meshes, so that when assembling the contact material, the above-mentioned contact material bodies are connected. There is no need to create special holes for the wire to pass through, and there is an advantage that the mesh can also be used as a hole for the wire to pass through. In addition, the above wire rod is
Since it is removably connected to the lower holding frame, the vertical length of the contact material can be easily increased or decreased by increasing or decreasing the number of the elements constituting the contact material, as necessary. Another advantage is that the area of the contact material can be increased or decreased. In addition, when polyolefin is used as the net material in the present invention, shells or crushed stones are packed in the lowest element body 1, or directly above the lower holding frame 8, in order to prevent it from floating in the water. It may be adopted to install corrosion-resistant steel plates along the entire width.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an embodiment of a contact aeration tank including the device of the present invention, Fig. 2 is an enlarged perspective view showing one of the contact materials of the invention, and Fig. 3 is an enlarged longitudinal section of the lower holding frame. Show the diagram. Explanation of symbols, 1... Contact material base, 2... Contact material, 3... Tank body, 4... Suspension frame, 5, 6... Hanging rod, 7, 8... Holding frame, 9, 10... ...Kushitsu wire rod.

Claims (1)

[Claims for Utility Model Registration] 1. A contact material 2 in which a plurality of contact material bodies 1 made of cylindrical net are arranged in a raft shape in an adjacent relation to each other, and this contact material 2 is erected on the upper part of a tank body 3. suspension frame 4
This is a contact material device for a contact aeration tank consisting of a pair of left and right hanging rods 5, 6 that can be suspended from each other. This wire rod 9,
The upper ends of the wire rods 9 and 10 are held by the upper holding frame 7 placed at the top of the contact material 2, and the lower ends of the wires 9 and 10 are held by the lower holding frame 8 placed at the bottom of the contact material 2. A contact material device for a contact aeration tank, characterized in that the contact material device is removably coupled. 2. The contact material device for a contact aeration tank according to claim 1, wherein the net is a polyolefin or polyvinyl chloride net.