JPH01242193A - Filter medium for contact oxidation - Google Patents

Abstract

PURPOSE:To prevent a filter medium for contact oxidation from clogging and to prevent also from scaling off of microorganisms, by dipping the filter medium having many bristles raised thereon in waste water held at aerobic environment, permitting thus sticking and propagation of aerobic microorganisms on the surface of the filter medium. CONSTITUTION:A filter medium 1 for contact oxidation is formed by raising surfacial fibers of plate base bodies 1 consisting of glass fiber, etc. randomly, and forming bristle parts 2 by reinforcing the raised fibers with a hardening agent. A waste water purifying apparatus is constituted by arranging plural numbers of the filter medium in parallel in each aeration tank 5 utilizing the filter medium as carrier for microorganisms. The waste water is purified in the aeration tank 5 contg. the filter medium 1 having many bristles 2 raised thereon, which provide a large surface area per unit volume of the tank 6. Moreover, the filter medium holds a large amt. of the microorganism but does not cause migration of the microorganisms in the waste water since the medium is constituted of bristles. Thus, scaling off of microorganisms is also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a biological filter medium for use in the treatment of wastewater and for attaching biofilm.

[Prior art] As a contact oxidation filter material that is immersed in wastewater maintained in an aerobic environment, aerobic microorganisms adhere to and propagate on the surface.
So far, fibrous materials that are intricately intertwined, spiral-shaped materials, plate-like materials, etc. are known.

[Problems to be solved by the invention] Filter media with entangled fibrous materials or spiral media have a large surface area per unit volume of the filter media, which is the core of the microbial membrane formed by the attachment of microorganisms. Can hold large amounts of microorganisms. However, handling is troublesome, the flow of oxygen contained in wastewater and water is poor, dead primary organisms, so-called unnecessary sludge, are not separated, and anaerobic bacteria are likely to grow in some areas. As a result, they often become clogged and partially exhibit a state of putrefaction, which can impede sewage treatment.

Although plate-shaped filter media are easy to handle and are less prone to clogging as described above, they have problems in that they are difficult to retain large amounts of microorganisms and lack the ability to decompose organic matter in wastewater.

The purpose of the present invention is to solve the problems of such conventional biological filter media.

[Means for Solving the Problem] That is, the object of the present invention is to provide a plate-shaped material for catalytic oxidation in which aerobic microorganisms are propagated on the surface by immersing it in wastewater in which an aerobic environment is maintained. This is achieved by a catalytic oxidation material characterized by a large number of bristles erected from a substrate.

[Function] In the filter medium of the present invention, since a large number of bristles are made to stand up from the plate-shaped base, clogging is prevented by the flow of water along the base. Microorganisms adhere to and form on the bristles that stand up from the base, but because they are bristles, they do not move in the water and can retain the microorganisms. Moreover, since it is plate-shaped, it is easy to handle.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) are a side view and a perspective view from the front side of the material for catalytic oxidation according to the present invention. In the figure 1
is a plate-like substrate, for example, made of something like glass fiber. Reference numeral 2 denotes bristles that stand up from the plate-like base 1. The bristle portions are made by randomly raising fibers on the surface of the substrate 1 made of glass fibers and reinforcing them with a hardening agent. However, they may be erected randomly depending on the device used. The bristles 2 are erected on both sides of the substrate 1, not on the front or back side.

The bristles 2 may be created separately and fixed to the substrate 1 with adhesive.

The thickness of the substrate 1 is preferably about 1 to 3 mm, and the thickness of the bristles 2 on one side is preferably about 20 to 30 mm, but in view of the objects and effects of the present invention, the thickness is not limited to this.

In addition, the bristles 2 are made to stand up on the substrate 1, and these are made of F# quality to prevent sludge from separating due to the flow of wastewater.This point will be described in detail using Fig. 2. .

The catalytic oxidation method material 1 of the present invention can be widely applied to various kinds of wastewater purification devices, but an example in which it is used in a general domestic wastewater purification device shown in FIG. 2 will be described here.

Figure 2 shows a biofilm treatment batch type domestic wastewater purification system.
The two-dot chain line crosses the ground. 3 is a water intake sedimentation tank, 4 is an aeration adjustment tank, 5 is an aeration tank, 6 is a drain disinfection tank, 7 is an aeration hole of an aeration diffuser, and 8 is a steel top cover. The purifier itself was maintained in an aerobic environment. While draining air tank 5,
This is a general biofilm treatment type purification device in which microbial carriers are placed and wastewater is purified by the symbiotic action of microbial colonies generated on the microbial carriers.

In the purification device, the effects will be explained when a plurality of filter media 1 according to the present invention are arranged in parallel in each aeration tank 5 as shown in the figure as microorganism carriers. The number of parallel filter media 1 and the number of parallel aeration tanks 5 are designed according to the purification capacity of the purification device.

Now, as shown by the arrow in the figure, the wastewater generated at the sewage source is sedimentation I! 1 and sent to the aeration adjustment tank 4. During this time, the flow rate of the wastewater and the air supply for supplying oxygen to the filter medium 1 and the like are adjusted by a flow rate adjustment device and an aeration diffuser (not shown) based on the processing capacity of the purification device.

Next, the wastewater is sent to the aeration tank 5, where full-scale wastewater purification is performed. Inside the aeration tank 5, a plurality of filter media 1 according to the present invention are arranged in parallel, and oxygen, etc. be supplied with. As explained in FIG. 1, the filter medium of the present invention has a plate-like substrate 1 with countless bristles 2 standing up, and therefore has a large surface area per unit volume and can retain a large amount of aerobic microorganisms. Since the bristles are erect, they do not move freely in the wastewater, and the release of microorganisms is prevented. Furthermore, due to its structure, the filter medium allows drainage to flow well along the substrate, and microorganisms are less likely to die due to lack of oxygen, and clogging is less likely to occur. Furthermore, since it is plate-shaped as a whole,
It is also easy to handle. In this way, the multi-stage aeration tank 5
The wastewater that has been gradually purified is finally discharged through the disinfection tank 6. Although some microorganisms in each type die, the precipitated domestic sludge is discharged and disposed of separately.

As explained above, the biological filter medium of the present invention, such as one in which spiral or fibers are entangled, can retain a large amount of microorganisms, but has good oxygen circulation and is unlikely to become clogged. Moreover, it is easy to handle like a plate-shaped one. In other words, it is an excellent hybrid biological method that combines the special effects of both of the above.

[Effects of the Invention] Since the filter medium of the present invention has a large number of bristles standing up from the plate-shaped base, clogging is prevented by the flow of water along the base. A microbial film is attached and formed on the bristles that stand up from the base, but because they are bristles, they do not move freely in the water, preventing the microorganisms from peeling off, and allowing a large amount of microorganisms to be retained. Moreover, since it is basically plate-shaped, it is easy to handle.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are examples of the filter medium for catalytic oxidation of the present invention, and FIG. 2 is a block diagram showing the filter medium of FIG. 1 applied to a wastewater purification device. 1...Plate-shaped substrate 2...Bristles 5...Aeration tank 7
...Aeration holes

Claims (1)

[Claims] Contact oxidation filter media is immersed in wastewater maintained in an aerobic environment to allow aerobic microorganisms to adhere to and propagate on the surface, and is characterized by a large number of bristles standing up from a plate-shaped base. filter media.