DE9416632U1 - Immersion bodies for rotary immersion reactors - Google Patents

Description

Submersible bodies for rotary submersible reactors

The invention relates to a submersible body for rotating submersible trickling filters in reactors for the biological treatment of waste water using microorganisms. Such elements are used in so-called submersible trickling filter aeration systems.

The usual systems of this type consist of a container in which a shaft is arranged horizontally. Discs are attached to this vertically next to one another in a rotationally fixed manner (DE OS 3 140 372). The shaft is located at about the height of the liquid level, so that the rotation causes the microorganisms settled on the discs to come into contact with the waste water and the ambient air in turn. The performance of these systems depends largely on the surface to be settled by the microorganisms. The discs are 1-2 cm thick and 1 cm apart. The diameter and thickness of the discs are limited for structural reasons. The distance between the discs must not be less than a minimum value, as the gaps could otherwise be filled up by the microorganisms. The discs are made of foamed plastic in order to keep the weight and material usage low. However, production requires large and expensive tools and the discs are sensitive to mechanical influences.

Various proposals have been made to increase the surface area and reduce manufacturing costs:
25

Plastic pipes (DE OS 3 532 948, DE PS 3 523 602),
• Discs with internal channels (DE OS 3 216 210, DE OS

3201848).

These solutions achieve the enlargement of the surface by reducing the wall thickness with appropriate profiling. The microstructure of the surface was essentially retained. In order to achieve a further enlargement of the surface, it was proposed in DE PS 4 227 056 to attach structural material to the surface. By enlarging the microstructure, a

A significant increase in surface area and at the same time better fixation of the microorganisms is achieved. The process for achieving this open structure is, however, very complex, as the composite body must be specially foamed and then torn apart. Adapting the microstructure to the respective process conditions is only possible to a limited extent. This means that there is a risk that the cavities will grow over and not participate sufficiently in the exchange of substances.

The invention is therefore based on the object of creating a submersible body with a large surface area and good fixation of the microorganisms for rotating body reactors, which can be produced easily and inexpensively. A further object is the production of variable structures for a wide variety of process conditions.

According to the invention, the object is achieved in that waterproof foam strips with an open-pore cell structure of 5 PPI to 100 PPI (pores per inch) are attached to a carrier body. Further advantageous embodiments can be found in the subclaims.

This solution creates a large surface with an optimal structure for the microorganisms using simple means. The open-pored foams are commercially available in various dimensions and pore sizes. With this innovation, it is therefore easy to adapt the structure to the respective application conditions.

The invention will be explained in more detail below using three exemplary embodiments.

Figure 1 shows the side view of a disc-shaped immersion body, with the lower half shown in section.

Figure 2 shows the side view of a diving body according to claim 7 in section.

Position 1 in Fig. 1 is a disk-shaped carrier body made of plastic. This can be solid or have channels (not shown) running through it. In

In the middle, the carrier body 1 has a larger hole to accommodate a shaft. The carrier body 1 is covered on both sides with foam strips 2. The thickness and pore size depends on the application and is, for example, 5 mm and 15 PPI (pores per inch) for submersible body reactors for processing municipal wastewater.

A further embodiment is shown in the lower half of Figure 1. Here, the carrier body 1 is only covered with foam strips 2 on one side. The carrier body 1 is provided with a large number of openings 3. This design ensures particularly good material exchange with the environment. A preferred application is the aerobic area in rotary immersion reactors. Since a large number of immersion bodies are arranged next to one another on the shaft, the invention offers the possibility of designing the immersion bodies accordingly for anaerobic processing. This is achieved by a smaller number of pores and a greater thickness of the foam strip 2. The microorganisms in the foam strip 2 that settle further away from the surface are no longer reached by ventilation and have an anaerobic environment.

Figure 2 shows a disk-shaped immersion body in which the carrier body 1 consists of several radial struts 5. A pair is positioned opposite one another, with one of them being welded to the hub 4 for the shaft and to an outer web 6. The strut 5 opposite is attached to this strut with bolts 7. The foam sheet 2 is arranged between the struts 5. Depending on the size of the immersion body, 8 to 16 double struts 5 are attached evenly distributed around the circumference. The foam sheets 2 are triangular in size and are held on both sides by a double strut.

Further modifications of the carrier body 1 and the foam sheet 2 are possible without departing from the essence of the invention.

Claims (7)

Protection claims 1. Submersible body for rotary submersible body reactors for the biological treatment of in particular waste water, consisting of structured plastic bodies that can be attached to a shaft, characterized in that waterproof foam webs (2) with an open-pore cell structure of 5 PPI to 100 PPI are attached to a carrier body (1). 2. Diving body according to claim 1, characterized in that the foam strips (2) consist of hard foam made of polyether-based polyurethane. 3. Immersion body according to claims 1 and 2, characterized in that the foam strips (2) have a thickness of 2 to 30 mm. 4. Immersion body according to claims 1 to 3, characterized in that the support body (1) is a disk-shaped plastic plate containing channels, which is coated on both sides with foam strips (2). 5. Immersion body according to claims 1 to 4, characterized in that the walls of the disc-shaped carrier body (1) are provided with a plurality of openings (3). 6. Diving body according to claims 1 to 5, characterized in that the foam webs (2) are glued to the carrier body (1) or are secured by elements in a form-fitting manner. 7. Diving body according to claims 1 to 3, characterized in that the support body (1) consists of radial struts (5) fastened to a hub (4), between which the foam webs (2) are fastened in a spiral or segmental manner.