JPH057885A - Microbe immobilizing carrier - Google Patents

Abstract

PURPOSE:To provide a microbe immobilizing carrier capable of being easily repaired and maintaining treating performance over a long period. CONSTITUTION:The conventional microbe immobilizing carrier which is set in a bioreactor tank and on which microbes are deposited and propagated is corded with a braid, the carrier is fixed at both upper and lower ends, and consequently, the carrier 15 repaired and exchanged with difficulty. Accordingly, this carrier consists of a series of warps 11 suspended from a hanger rod 13 horizontally placed at the upper part of the tank with the upper ends fixed to the rod at regular intervals and a series of wefts 12 connected to the warp and extending in the horizontal direction, the warp and weft are interwoven into a net to obtain the carrier, and the carrier is suspended in the tank. Since only the upper part of the carrier is fixed, the carrier can easily be attached and detached, microbes are deposited even on the weft, and hence the treating efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for purifying wastewater by biological treatment, and more particularly to improvement of a biological fixed carrier for adhering and growing microorganisms in a tank.

[0002]

2. Description of the Related Art Conventionally, for example, the one shown in FIG. 3 is known as a biological fixed carrier using a braid such as a biomodule. This type of wastewater treatment device is often a tank that receives wastewater and adjusts the flow rate, a bioreactor tank such as an aeration tank that purifies the wastewater by biological treatment, and a precipitate that receives the treated water and discharges the supernatant water. The bioreactor is composed of a tank, and the biological fixed carrier as a biological contact filter medium is installed in the bioreactor-tank.

A conventional biological fixed carrier is shown in FIG.
Bioreactor-upper and lower horizontal suspension rods 4 and 5 fixed to pedestals 2 and 3 fixed to the upper and lower parts in the tank 1,
The braids 6 were constituted by vertically installed braids 6 at appropriate intervals between the hanging rods, so that the braids were arranged in a blind shape. A microorganism adheres to each braid of the organism-fixing carrier and is immobilized to grow the microorganism.

Bioreactor-Air is inserted into the tank to keep the tank aerobic, agitating by the blowing of air and causing reflux in the tank, thereby making oxygen and sludge substances suitable for microorganisms. Supply and purify wastewater by oxidative decomposition.

[0005]

Since the conventional biological fixed carrier is composed of a braid in a comb shape and each braid is fixed at both upper and lower ends thereof, problems such as clogging or damage due to excessive adherence of microorganisms occur. In this case, repair work such as repair or replacement is extremely difficult, and there is a problem that the operation of the entire processing apparatus must be stopped in some cases due to the repair work. In addition, if the spacing between the braids is increased to prevent clogging due to excessive adherence of microorganisms, the contact efficiency of oxygen and sludge substances with the microorganisms is reduced,
There is a drawback that the processing performance decreases.

An object of the present invention is to solve the above-mentioned problems of the prior art, and therefore facilitates repair work such as repair or replacement, and thus can maintain the treatment performance for a long period of time. Is to provide.

[0007]

The bio-immobilized carrier according to the present invention is characterized in that a hanging rod 13 which is horizontally installed at the upper part of a bioreactor tank and an upper end of the hanging rod 13 is fixed to the hanging rod at an appropriate interval. It is composed of a series of vertical strings 11 and a series of horizontal strings 12 connected to the vertical strings and extending in the transverse direction. Therefore, the strings are knitted in a net shape with the vertical strings and the horizontal strings, and are suspended in a tank for use.

[0008]

This bio-immobilized carrier is easily unitized according to the sectional shape of the tank and only the upper part is fixed, so that it can be easily attached or detached on the tank, and thus the treatment apparatus Repair work can be done easily without stopping operation. In addition, since the microorganisms adhere to each lateral string and further promote the growth thereof, the treatment efficiency is improved.

[0009]

1 and 2 illustrate a biofixation carrier according to the present invention, as shown, this biofixation carrier 10 is also installed in the bioreactor-tank 1 and therefore the upper part of the tank. The pedestals 2 and 2 are fixed at the same level at positions facing each other. This carrier is installed at a predetermined position by mounting the suspension rods 13 on the mounts 2 on both sides. Therefore, the hanging bar 13 is installed horizontally.

As shown in FIG. 1, the biological fixed carrier 10 of the present invention is composed of a series of vertical strings 11 and a series of horizontal strings 12 in a net shape, and the net is formed according to the sectional shape of the tank 1. It is formed to have a slightly smaller surface. Each of the series of vertical strings 11 is fixed to the hanging bar 13 at the upper end thereof and hangs down from the hanging bar. These vertical cords are preferably fixed to the hanging rod at equal intervals as shown.

Each horizontal string 12 intersects with each vertical string 11 and is connected to each other to extend in the horizontal direction, and thus is arranged horizontally when installed in the tank 1. These transverse strings 12 are also preferably equidistantly arranged, and in FIG. 2 the spacing of the longitudinal strings is equal to that of the transverse strings, so that the nets they form are square. Needless to say, the intervals may not be equal.

The material of these vertical strings 11 and horizontal strings 12,
The shape is not particularly limited, but a ribbon-shaped braid is preferably used, or a fiber material formed into a string or a twisted wire obtained by combining several fiber materials can be used. Since filamentous bacteria can be attached by using a string, it is possible to prevent so-called bulking in which the whole sludge swells like a cotton wool.

Since this organism-fixing carrier is composed of the hanging rod 13 and the net of the vertical cords 11 and the horizontal cords 12 which are horizontally installed in the upper part of the tank as described above, it can be constructed as a carrier unit. The carrier units are juxtaposed at a predetermined pitch on a pedestal 2 fixed to the upper part of the tank, and each carrier unit is installed by, for example, inserting a corresponding portion of a suspension rod 13 into a protrusion provided on the pedestal 2. Due to
It is preferable that it is detachably set.

Although not shown in the drawing, an air diffuser for aeration is provided under the biological fixed carrier 10 inside the bioreactor-tank 1, and the air diffuser enters the tank 1 from the air diffuser during operation. Insert air, make the tank aerobic and stir, bring about reflux,
Oxygen and sludge substances are supplied to the microorganisms attached to the vertical string 11 and the horizontal string 12 to promote the growth of the microorganisms. It should be noted that it is possible to easily change the habitation state of microorganisms by changing the composition of the vertical string and the horizontal string.

In this carrier, since the lower part is unrestrained, it swings due to the water flow in the tank, which has the effect of increasing the contact efficiency with the liquid and preventing clogging by mutual contact of the carriers, but because of the net shape. There is no entanglement. In addition, each horizontal string 12 also plays a role as a biological carrier like the vertical string 11, so that it promotes the attachment and growth of microorganisms and enhances the contact efficiency with oxygen and sludge substances, thus improving the treatment efficiency.

[0016]

As described above, according to the present invention, the contact efficiency of oxygen and sludge substances with respect to microorganisms can be improved, and thus the treatment performance can be improved, and this biological fixed carrier can be unitized, Since the attachment and removal are easy, the repair work can be performed extremely easily, and the situation such as stopping the operation of the processing device for the repair work can be avoided. Further, since the pedestal used for attaching the carrier is only the upper part and the hanging rod is only provided on the upper end of the net, the manufacturing cost and the mounting cost are reduced, which contributes to the cost reduction.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a bioreactor-tank equipped with a bio-immobilized carrier according to an example of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 Bioreactor equipped with a conventional bio-immobilized carrier
It is a longitudinal cross-sectional view of the tank.

[Explanation of symbols]

 1 bioreactor-tank 10 biological fixed carrier 11 vertical string 12 horizontal string 13 hanging rod

Claims (1)

Claims: 1. A bioreactor such as an aeration tank for purifying wastewater by biological treatment-a biological fixed carrier for adhering and growing microorganisms, which is installed in a tank and is horizontal to the upper part of the tank. And a series of vertical straps whose upper ends are fixed and hang down at appropriate intervals on the suspension rods, and which are connected to each of the vertical straps so as to form a net with the vertical straps. A biofixation carrier comprising a series of lateral strings extending laterally.