JPH0631294A - Multi-ring fixed biological membrane filter medium - Google Patents

Abstract

PURPOSE:To obtain a multi-ring biological membrane filter medium which is extremely useful for aerophobic or aerophilic treatment, cuts down time required for treatment, and provides an expanded use range from fouled water treatment to fermentation by providing through holes in a straight pipe with a baffle board installed projecting in the tube, storing a straight pipe of the same structure in the interior and arranging through holes in an outer straight pipe and an inner straight pipe so that the holes stack over the other. CONSTITUTION:Each of fixed biological membrane filter material 1, 1' is composed of straight pipes each having a different diameter, and a rectangular through hole 2 inclined against the shaft of a straight pipe 4 is bored on the lateral side of the through hole 2. In addition, a baffle board 3 which is at right angles with the side wall of the straight pipe 4 and has almost the same area as the through hole 2 is provided projecting from lateral side of the through hole 2 to the interior of the pipe 4. Further, so many through holes 2 and baffle boards 3 are provided so that they are symmetrical against the center line of the straight pipe and the horizontal plane of the axial line respectively, and another straight pipe of the same structure as the straight line 4 are concentrically arranged in straight pipe 4. Finally, the through holes and other parts of an adjacent straight line 4 and another straight pipe are arranged so that the holes and parts stack in a radial line in each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium used for aerobic and anaerobic sewage treatment by a biofilm, and in particular, sewage is more rationally agitated to nourish microorganisms and at the same time A filter material that removes excrement and does not clog.

[0002]

2. Description of the Related Art There are many types of aerobic treatment for filter materials,
The use of filter materials for anaerobic treatment caused "clogging", so there were very few types. The reason for this is that anaerobic microorganisms produce coral-like sulfides, which are deposited on the surface of the filter material, which has been considered to be solved by the aerobic condition. Therefore, in order to suppress the occurrence of this clogging and improve the sewage treatment capacity, it is easy to cause crossflow by the filter material, or the specific surface area of the filter material is increased, or sludge-dissolving bacteria are easily attached. Methods such as manufacturing a filter material with ceramics are performed. By the way, it is also known that countercurrent is superior to crossflow in order to enhance the treatment of sewage, but it is because the stirring becomes closer to perfection, and therefore the counterflow that tends to cause countercurrent. It has been said that the most important thing is to form, but until now, there has been no example of producing it except the present inventor.

By the way, the inventor of the present invention first produced a filter material which was prone to cross flow and counter flow, and water treatment was carried out using this filter, and a remarkable treatment effect was produced.

That is, this filter has a rectangular through hole formed in the side wall of the straight pipe, the rectangular through hole being inclined with respect to the axis of the straight pipe. The bottom side of the through hole is perpendicular to the side wall of the pipe. In addition, a baffle plate having substantially the same area as the through hole is projected, and a large number of the baffle plate and the baffle plate are provided so as to be symmetric with respect to each of the center line of the straight pipe and the horizontal plane of the axis line. It is a fixed biofilm filter material (see Japanese Patent Application No. 3-92686).

In the wastewater treatment equipment using this filter material, even if the TSS / COD was around 20, the removal rate of TSS did not fall below 99% in the treatment time of several hours at all times. The reason for obtaining such excellent results is that cross flow and counter flow occur, stirring is almost complete, and the water quality in the individual treatment devices becomes even, which results in the above-mentioned coral sulfide. I noticed that I was avoiding the accumulation or uneven distribution of. It is nothing but a stirring effect.

[0006]

Therefore, the inventor of the present invention
As a result of various studies in order to further improve the above points, the effect can be further enhanced by using a so-called polycyclic type in which the filter material made of a straight pipe is arranged concentrically, so that the removal rate of many indicators can be improved. The inventors have completed the present invention by finding that it is possible to increase the processing time and simultaneously shorten the processing time. Therefore, an object of the present invention is to provide a filter material having an improved sewage treatment capacity.

[0007]

That is, the gist of the present invention consists of a plurality of straight pipes having different diameters, and the side wall of the straight pipe has a rectangular through hole inclined with respect to the axis of the straight pipe. And project a baffle plate that is at a right angle to the side wall of the pipe from the side of the through hole and is substantially the same area as the through hole, and the through hole and the baffle plate are located at the center of the straight pipe. A large number are provided so as to be symmetrical with respect to each of the line and the horizontal plane of the axis, and another straight pipe having the same structure as the straight pipe is concentrically arranged inside the straight pipe,
The fixed biomembrane filter material is characterized in that the through holes of adjacent straight pipes are arranged so as not to overlap each other on a radial line.

That is, in the present invention, a straight pipe is used in which a large number of through holes and baffles are provided on the side wall of the straight pipe so as to be symmetrical with respect to the center line of the straight pipe and the horizontal plane of the center line.
Arranged concentrically with a straight pipe having the same structure as this straight pipe but having a diameter different by 20 cm or more from the diameter of the straight pipe, and an arbitrary through hole of the straight pipe. Is a fixed biomembrane filter characterized in that two or more straight pipes are provided in a polycyclic manner so as not to overlap with any part of the straight pipe on the radial line of the straight pipe.

The straight pipe in the present invention is preferably constructed by bisque-firing with water permeation on both sides of the pipe itself, and the dimensions of the straight pipe are 10 cm or more and 1 m in length. As described above, those having the smallest diameter are used as the inner tubes, and those having the larger diameter are arranged concentrically. Spaced about 8-12 cm outside the inner tube, preferably 1
A straight pipe (outer pipe) is placed so as to keep about 0 cm, and a double ring, a triple ring, etc. are sequentially arranged at equal intervals. The size of the through hole and baffle plate provided in the straight pipe should be about the same, and it depends on the concentration of the treated water, but it is 2 cm to 10 cm x 5
It is about cm to 15 cm. When arranging the inner pipe and the outer pipe, the through holes of the adjacent straight pipes are prevented from overlapping each other on the radial line. By arranging in this way, the baffle plate of the innermost straight pipe is prevented. The water that has collided with and has come out of the tube through the through hole does not immediately go out from the through hole of the adjacent straight tube, but collides with the wall and is reflected, causing a counterflow and the stirring becomes even more complete. As a result, it nourishes the microorganisms and removes the excretion of the microorganisms,
Moreover, it does not cause clogging. This straight pipe is not limited to a case where the inner pipe and the outer pipe are simply doubled, but may be arranged in triple, quadruple, etc. if desired. Can be raised.

When assembling a sewage treatment apparatus with this filter material, a V-shaped pipe or a U-shaped pipe is installed at the bottom, and both ends are stacked up to a desired height, and one of them is stacked. Using a downward flow or another upward flow, an outer cylinder made of ceramics, stainless steel, or titanium is provided on the outer circumference of the outermost straight pipe with a through hole and a baffle plate, and the outer wall is created by the peripheral effect that stands up. The sewage that flows along along it is made to flow into the pipe through the through hole of the outermost straight pipe, and the water that comes out most inside is returned to the outside again by this straight pipe and the outer cylinder. However, when using a straight tube of unglazed, the scale is limited. To solve this problem, we made a straight basket-shaped tube made of lattice-like stainless steel, titanium and other non-corrosive frames (around) and mechanically fitted a bisque-fired plate to the bisque-fired of any scale. By making a straight tube containing it, the above size limitation can be overcome.

The present invention will now be described in more detail with reference to the drawings. FIG. 1 is a plan view of the fixed biomembrane filter medium according to the present invention, and FIG. 2 is a plan view of the filter medium for explaining the water flow in the filter medium. In FIG. 1, a filter medium 1 comprises a straight pipe 4, a side wall of the straight pipe 4 is provided with a through hole 2, and a side wall of the through hole is provided with a baffle plate 3 inside the pipe. Then, a plurality of sets are provided in the same horizontal plane and at a target position with respect to the center line of the straight pipe, with the through hole and the baffle plate as one set. This filter medium is housed in an outer tube 9 made of pottery, stainless steel, titanium, or the like. By the way, inside the filter material 1, except that the diameter is smaller than 10 cm, the filter material 1'having exactly the same structure as the filter material 1 ', except that the diameter is smaller than the filter material 1'by 20 cm or more. The filter materials 1 "having exactly the same structure as that of the'are sequentially stored in the filter material 1. In this case, the center lines of the filter materials 1, 1 ', 1" and the like are aligned.

FIG. 2 is a plan view of the filter medium showing a case where four straight holes 4 and four baffle plates 3 are provided in the straight pipe 4. That is, on one of the side surfaces obtained by dividing the peripheral wall of the pipe into four equal parts, a baffle plate 3 of the same type is provided on the side face of the same level next to it, and the inclination angle of the baffle plate 3 is set to the adjacent baffle plate 3. Be equal to the complement of the tilt angle of. The same relationship is established between the nearest upper and lower baffles, and as a result, the sewage that has flowed in through each through hole 2 flows out through each through hole 2 at the bottom thereof, and between the baffle plate 3 and the adjacent baffle plate between them. A cross flow is generated by the baffle plate 3 and collides with the inner wall of the outer tube 9 made of ceramic or the like at each outlet,
Partly backflow, generate counterflow on baffle, flow downstream,
It flows into the ceramic pipe through the lower hole along the baffle plate.
In this way, in the filter medium of the present invention, the baffle plate and the through hole cause the cross flow and the counter flow. Such a phenomenon occurs when one filter material 1 is housed inside the outer tube 9, and the filter material 1 ′ sharing the center line of the filter material 1 inside the filter material 1 is the filter material 1 ′. The structure is exactly the same as that of the first embodiment, and when each of the through holes 2'of the filter material 1'is provided so as not to overlap with any part of the through hole 2 of the filter material 1 in the radius of the outer tube, The flow of sewage between the material 1 and the filter material 1 ′ is exactly the same as in the case of the filter material 1 and the outer tube 9 which have been tried previously. This similar flow of water is stored inside the water filter 1,
There is no difference between the inner filter 1 ′ such as the filter 1 ′ sharing the center line and the outer filter 1 thereof. The basic relationship is that the amount of sewage that flows into tubular upright straight pipes such as the filter and outer pipe here is larger in the amount of water flowing down by selecting the periphery than the center of the pipe. The so-called edge effect (edge)
effects) is this. In this way, two or more filter materials can be stored adjacent to each other until the diameter of the filter material stored inside is 10 cm. in this case,
The center line of each filter exactly matches that of the outer tube,
No part of the baffle plates of adjacent filters will overlap on the radius of the outer tube passing through that part.

The area and the number of through holes in these filters are determined in consideration of the concentration of suspended solids in the wastewater. Since the contact area between the sewage and the filter material can be increased while producing the counter flow and the cross flow, and can be realized by complete stirring, the stirrer, which is one of the difficult problems of the conventional anaerobic treatment apparatus, is not necessary. Further, since the baffle plate is formed at an angle less than a right angle with respect to the flow of sewage to completely eliminate the place where the suspended matter is accumulated, "clogging" in the filter material is completely prevented.

Water purified by a treatment apparatus using such a filter is preferably sent to a water purification apparatus usually composed of an anaerobic tank, an agitation tank and a final settling tank. The system of this water purification device is shown in FIG.

Due to such a structure, the SS removal rate of the present invention is particularly high, and the TSS / COD of the raw water in the anaerobic treatment is 2.
From 25 to 1.95, COD concentration is 6.880 mg / l
To 2.740 mg / l sewage, the constant removal rate is 9
Over 9%, there were no sludge retention points in the filter material, and sludge precipitation could be completely prevented. Even when the TKN / COD of the raw water greatly exceeded 0.10, the removal rate of nitrogen and phosphorus always exceeded 90%.

[0016]

As described above, a large number of through holes are provided in the straight pipe, and a baffle plate is provided so as to project inside the straight pipe, and a straight pipe having exactly the same structure as the straight pipe is housed in the straight pipe. By increasing the specific surface area and “clogging” by avoiding overlapping with any through hole of the internal straight pipe that contains any part of the through hole of the straight pipe on the radius emitted from the center line shared by both The long-standing problem of water treatment, which is contradictory to the occurrence of "," was solved by thorough stirring. As a result, it is extremely effective not only for anaerobic treatment but also for aerobic treatment regardless of the material used for this device, enabling reduction of treatment time and not only sewage treatment as a substance to be treated. , Even the substances targeted for fermentation,
It can contribute to expanding the range.

[0017]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fixed biomembrane filter material according to the present invention.

FIG. 2 is a plan view of a fixed biomembrane filter material according to the present invention.

FIG. 3 is a diagram showing an example of a sewage treatment system according to the present invention.

[Explanation of symbols]

 1,1 'Filter material A Anaerobic tank 2,2' Through hole B Aeration tank 3,3 'Baffle plate C Precipitation tank 4,4' Straight pipe D Dephosphorization device 9 Outer pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuyoshi Arisui 3-29-15, Nishimachi, Kokubunji, Tokyo

Claims (1)

[Claims] 1. A straight pipe made of a plurality of straight pipes having different diameters, and a rectangular parallelepiped through hole that is inclined with respect to the axis of the straight pipe is formed in a side wall of the straight pipe. A baffle plate, which is perpendicular to the side wall of the pipe and has substantially the same area as the through hole, is provided inside the pipe,
A large number of the through holes and baffles are provided so as to be symmetrical with respect to each of the center line of the straight pipe and the horizontal plane of the axis, and the inside of the straight pipe has exactly the same structure as the straight pipe and has a small diameter. The fixed biofilm filter medium, wherein the straight pipes are arranged concentrically, and the through holes of the adjacent straight pipes are arranged so as not to overlap each other on a radial line.