JPH0448802Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a hanging defoaming device that dissolves a solid defoaming agent when sewage foams.

BACKGROUND OF THE INVENTION In combined wastewater treatment tanks and the like, detergents and the like in the inflowing wastewater foam in the air chambers, so a defoaming device is required.

These defoaming devices include systems that use defoaming pumps, systems that use liquid defoaming agents, and systems that use solid defoaming agents. A method has been proposed in which a filled cartridge is immersed in waste water to dissolve and add an antifoaming agent. (Utility Model Publication No. 63-41052 and Utility Model Application No. 1988
-1407 Publication) Problems to be Solved by the Invention Conventionally known defoaming devices using solid defoaming agents have slits or holes bored in the lower side wall and bottom of a cylindrical container, as shown in Fig. 4. In this method, the solid antifoaming agent and the waste water were brought into contact by filling a dissolved dissolver with the chemical and immersing the bottom of the dissolver in waste water.

However, in the defoaming device described above, the solid defoaming agent is constantly in contact with the waste water, so that the solid defoaming agent dissolves excessively and cannot be used for a long period of time.

Furthermore, when a dissolver with slits or holes is suspended above waste water, the through-hole portion of the dissolver is thick, making it difficult for bubbles to pass through the slits or holes into the dissolver. A sufficient defoaming effect could not be obtained.

A method of filling a mesh bag with a solid antifoam agent and suspending it above the wastewater has been considered, but the bag filled with the drug becomes unstable, and the height from the wastewater surface and the drug and wastewater are Since the amount of contact changes constantly,
There was a drawback that the amount of antifoaming agent supplied to the wastewater was significantly excessive or insufficient.

Means for Solving the Problems The inventors of the present invention have conducted repeated studies to solve these problems, and found that they filled a dissolver with a solid antifoaming agent, and placed the lower part of the melter on the surface of the rising foam. In a hanging antifoaming device that is suspended above the water surface as if in contact with the water, the drug storage part in the dissolver is cylindrical, made of wire material with a wire diameter of 2 mm or less, and has a large mesh. By providing a net-like basket with a height of 5 mm or more and protruding 3 to 8 cm below the lower end of the cylindrical storage part, the solid antifoaming agent is dissolved in proportion to the amount of foam generated, and the antifoaming effect is improved. We have discovered a defoaming device that can sustainably exhibit the following effects.

A melter suitable for carrying out the present invention has a storage part made of a corrosion-resistant material such as polyethylene or polypropylene, and its shape can be cylindrical, rectangular, or flared at the bottom. .

Further, a plurality of through holes may be formed in the side wall of the housing part to the extent that it does not easily deform.

The net-like basket provided below the cylindrical storage part is made of synthetic resin or corrosion-resistant metal material, the wire diameter of the wire material is 2 mm or less, preferably 1 mm or less, and the mesh size is 5 mm or more. . If the thickness of the wire material of the mesh basket exceeds 2 mm, the amount of solid antifoaming agent dissolved will decrease significantly.

The shape of the mesh basket used in the melter of the present invention may be hemispherical, bowl-shaped, or cylindrical, and it projects approximately 3 to 8 cm downward from the lower end of the housing.

In implementing this proposal, in order to fix the cylindrical storage part and the mesh basket, a band-shaped protruding edge is formed at the lower end of the storage part, this is fitted into the opening of the mesh basket, and it is tied with a string. Alternatively, they may be screwed together using an annular fastener.

Effect According to this invention, a net-like basket with a mesh size of 5 mm or more made of wire material with a wire diameter of 2 mm or less is placed in the cylindrical storage part 3 to 8 cm below the lower end of the cylindrical storage part.
Since the solid defoamer is provided so as to protrude, the solid defoamer comes into contact with its own weight and foam and softens, so that the wires of the net-like basket dig into the defoamer and the surface of the solid defoamer becomes net-like. Since the net-like basket protrudes from the basket (see Figure 3) and is located at the lowest position of the dissolver, the solid defoamer and foam come into direct contact and the defoamer is quickly dissolved.

Example In the melter 1 shown in the drawings, a cylindrical storage part 2 of the melter is made by molding synthetic resin, and the storage part 2 has an upper part with a locking protrusion 3 and a band-shaped protrusion 4 formed therein. The space between the lower part and the lower part widens towards the bottom.

The mesh basket 5 of the melter 1 is a mesh body made by interlacing synthetic resin wire materials 6, 6, . is attached to the strip ridge 4 of the storage section 2, and the elongated net-like basket 5 is positioned about 5 to 6 cm below the lower end of the storage section 2 in a bowl shape. The two are crimped from the outer circumferential side with a fastener 7 and fixed. 8 in the figure is a hanging tool,
9 represents the palate, and 10 represents a silicone solid antifoaming agent.

Figure 2 shows the state in which the dissolved device 1 of the present invention is used in an aeration tank. It is suspended and the generated bubbles 12, 12... are brought into contact with the lower part of the melter. The solid antifoaming agent 10 is softened by coming into contact with the foam 12, and the solid antifoaming agent 10 becomes wedged into the filamentous material 6 of the mesh basket 5 as shown in FIG. In this case, the solid antifoaming agent 10 and the foam 12 come into direct contact with each other, so that the antifoaming agent 10 is quickly dissolved and an efficient antifoaming effect can be obtained.

In this case, if the wire diameter of the wire material 6 constituting the mesh basket 5 is thicker than 2 mm or the mesh size is smaller than 5 mm, the solid antifoaming agent 10 Even if it is softened, it cannot be expected that the antifoaming agent 10 will fully penetrate into the filamentous material 6 of the net-like basket 5, and an efficient antifoaming effect cannot be obtained.

Figure 4 shows a conventional dissolver 1'.
Slits 13, 13... are bored in the lower wall of the cylindrical body, and holes 14, 14... are bored in the bottom part.

Effects of the invention According to this invention, the solid antifoaming agent is placed above the wastewater, and only the solid antifoaming agent and foam are brought into direct contact, so that the antifoaming effect appears quickly and the solid antifoaming agent Does not dissolve excessively. In addition, the solid antifoaming agent and the rising foam come into contact only when necessary, and the antifoaming agent is eluted and the antifoaming effect is generated, so the antifoaming effect can be maintained for a long period of time. I can do it.

[Brief explanation of the drawing]

Fig. 1 is an enlarged longitudinal cross-sectional view showing an example of the dissolver in the proposed device, Fig. 2 is a longitudinal cross-sectional view showing the proposed device used in an aeration tank, and Fig. 3 is an enlarged cross-sectional view of the main parts. , Fig. 4 is an elevational view of a conventional melting device with some parts missing. represents an agent.

Claims (1)

[Scope of utility model registration request] In a hanging type antifoaming device in which a dissolver is filled with a solid antifoaming agent and the lower part thereof is suspended above the water surface so as to be in contact with the surface of the rising foam, the amount of the agent in the dissolver is The storage part is cylindrical, and a mesh basket made of wire material with a wire diameter of 2 mm or less and a mesh size of 5 mm or more is provided so as to protrude 3 to 8 cm below the lower end of the cylindrical storage part. A hanging type defoaming device characterized by: