JPS6328494A - Pressurization type bioreactor - Google Patents

Abstract

PURPOSE:To improve treatment efficiency by introducing and circulating raw water to a flow type aeration tank where carriers formed by sticking microorganisms to inorg. materials are suspended and subjecting the raw water to a biological decomposing and cleaning treatment in the pressurized state. CONSTITUTION:A tank body 1 is formed by fixing a hollow inverted conical body 4 to the bottom end of a hollow cylindrical body 3 having a perpendicular shaft and a cap 2. A gas-liquid boundary face 7 segmenting a gas part 5 and a liquid part 6 is formed in said body 1. An inside cylinder 8 and outside cylinder 9 are coaxially suspended and provided to the cap 2 apart at a space from the bottom of the body 1. An intermediate cylinder 10 is coaxially erected to the conical body 4 between the inside cylinder and the outside cylinder in such a manner that the top end thereof is positioned below the gas-liquid boundary face 7. A 1st carrier part 11 and 2nd carrier part 12 are respectively formed to the inside and outside of the intermediate cylinder and an air lift 13 which is opened at the bottom end and is connected to a compressor 16 is provided to the carrier part 11. An air diffusion pipe 19 is provided to the carrier part 12 and the upper part of the inside cylinder and the air diffusion pipe are connected via a blower 20.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves supplying raw water to a fluidized bed type aeration tank in which a carrier consisting of microorganisms attached to an inorganic substance or encapsulated in an organic substance is suspended. This invention relates to a pressurized pipe reactor that biologically decomposes and purifies raw water in a pressurized state by introducing and circulating the water.

[Conventional technology]

In recent years, microorganisms and enzymes have been used in the field of sewage treatment.

So-called bioreactors that utilize biocatalysts such as animal and plant cells are becoming widely used, and the purification efficiency of wastewater such as sewage is gradually improving. As the above-mentioned bioreactor, there is, for example, one described in JP-A-60-122095. In other words, when raw water is introduced into a fluidized bed type aeration tank for treatment.

In the tank, carriers with attached microorganisms are suspended.

The raw water is circulated through the tank along with the raw water through an air lift pipe, and during this circulating flow, the raw water comes into contact with carriers on which microorganisms are attached, and is biologically decomposed.

[Problems to be Solved by the Invention] In the conventional bioreactors described above, the aeration tank is generally under atmospheric pressure, so the oxygen absorption efficiency remains at a low level of 8 to 10%, resulting in a low treatment efficiency. There is. Furthermore, when the above-mentioned biological decomposition treatment is carried out in a single aeration tank, a short circuit occurs in the raw water, causing a phenomenon in which the untreated raw water is discharged as is. High BOD again? Because the living environments of microorganisms are different between a degree and low BOD concentration, aeration treatment is generally carried out in two tanks. Therefore, there are problems in that the required area increases, and the work becomes complicated.

The present invention solves the problems existing in the above-mentioned prior art, and has a simple and compact structure.

The purpose is to provide a pressurized bioreactor with high processing efficiency.

[Means for solving problems]

In order to solve the above-mentioned problems of the prior art, the present invention has two aspects.

A. A hollow inverted conical body is fixed to the lower end of a hollow hollow body having a vertical shaft and a lid to form a tank body.

B. A gas-liquid interface is formed in the tank body to separate an upper gas portion and a lower liquid portion.

C0 An inner tube and an outer tube are each coaxially suspended from the lid forming the tank body with a gap between them and the bottom of the tank body.

D. In the conical body forming the bottom of the tank body, an intermediate cylinder is installed coaxially between the inner cylinder and the outer cylinder so that its upper end is located below the gas-liquid interface.

E, a first carrier part and a second carrier part are provided inside and outside the intermediate cylinder, respectively.
form a carrier part.

F. The first carrier section is provided with an air lift whose upper and lower ends are open to the gas section and the liquid section, respectively, and which are connected to a compressor.

G. A fumarole pipe is installed at the bottom of the second carrier section.

14. Connect the upper part of the inner cylinder and the blow pipe via a blower.

(2) A raw water supply pipe is provided on the upper part of the inner cylinder, and a treated water discharge pipe is provided on the outer wall of the tank body.

This technical method was adopted.

[Effect]

With the above configuration, raw water is pumped and injected into the tank body,
The pressure inside the tank body is maintained at a pressure exceeding 1 kg/cm'', preferably 2 to 3 kg/am'', and the flow is caused as shown by the arrow in FIG. First, the raw water is in the first carrier part such that 1, for example, BOD>Agricultural degree is 1.000 p, p, m
, to 200-300 p, p, m.

Next, in the second carrier section, it is aerated with air from the fumarole pipe, and the BOD? For example, the M degree is 50p, p, m.

It is discharged as treated water. Note that while the carrier rises together with the raw water in the airlift at the center of the tank body, the organic and inorganic carriers come into contact with each other and rub against each other, thereby peeling off deposits on one surface and maintaining the activity of the carrier itself.

〔Example〕

The figure is a vertical sectional view schematically showing an embodiment of the present invention. In the figure, 1 is a tank body, which is formed by fixing a hollow cylindrical body 3 having M2 and a hollow inverted conical body 4, and is installed with the shaft in a vertical position. A gas part 5 is provided in the upper part of the tank body 1, and a liquid part 6 is provided in the lower part. 7 is an air-liquid interface. Next, an inner tube 8 and an outer tube 9 are each provided on the lid 2 so as to be suspended coaxially with the tank body 1.
A gap is provided with the hollow inverted cone 4 forming the bottom of the cone. Next, the hollow inverted cone 4 is provided with an intermediate cylinder 10 extending between the inner cylinder 8 and the outer cylinder 9, the upper end of which is connected to the gas-liquid interface.
To be located further down.

It is provided coaxially with the tank body 1. With the above configuration, the first carrier portion 11. In addition, a second carrier portion 12 is formed at an intermediate lower portion between the intermediate cylinder 10 and the outer cylinder 9. Next, the first carrier part 1
1, the upper and lower ends are connected to the gas section 5 and the liquid section 6.
An air lift 13 is provided which opens downward. An air chamber 14 is provided near the lower end of the air lift 13 and connected to a compressor 16 via a pipe 15 so that compressed air can be injected into the air lift 13.

Note that a cylindrical body 17 is provided at the upper end of the air lift 13, and the lower end faces the gas-liquid interface 7. ! A carrier moving vehicle 18 formed in the shape of a two-headed cone is fixed near the gas-liquid interface 7.

Next, reference numeral 19 denotes a fumarole pipe, which is provided at the lower part of the second carrier portion 12 and connects the upper part of the inner cylinder 8 and the fume pipe 19 via a pipe 21 in which a blower 20 is interposed. Also, the inner cylinder 8
A raw water supply pipe 2 with a pressure pump 22 interposed in the upper part of the
Connect 3. Reference numeral 24 designates a check valve, and 25 designates a bypass pipe line, which connects the tank body 1 and the raw water supply pipe 23 with a valve 26 interposed therebetween. 27 is a treated water discharge pipe;
It is installed on the outer wall of the tank body 1, and three valves are installed. Next, 29 is a liquid level gauge, which is provided at M2 of the tank body 1 and is connected to the valve 26 so that it can be controlled in conjunction with the valve 26. A pressure switch 30 and a valve 31 are provided on the lid 2 above the inner cylinder 8, and the two are connected so that they can be controlled in conjunction with each other.

The quadratic effect will be described with the above configuration.

First, the raw water supply pipe 2 is operated by operating the pump 22 for pressure feeding the raw water.
3, raw water is injected into the tank body 1 to form a gas portion 5 and a liquid portion 6. Note that a carrier is suspended in the first carrier part 11 and the second carrier part 12 in advance. The carrier is formed by mixing an organic carrier and an inorganic carrier, and the filling amount is, for example, 15% by volume and 10% by volume of the effective volume, respectively.
shall be.

The organic carrier is made of a polymer material such as alginic acid or polyacrylamide that contains microorganisms, and the inorganic carrier is made of microorganisms attached to the outer surface of inorganic particles such as fine sand. 2. The size of the particles shall have a distribution of 1 to 3 mm. As described above, the pressure inside the tank body 1 is maintained at 2 to 3 kg/cm", and the raw water is made to flow as shown by the arrow. In other words, in the air lift 13, the raw water and the carrier are moved upward by the injection of compressed air. In this case, the carrier moves to the liquid part 6 of the inner cylinder 8 along the carrier moving vehicle 18 provided near the gas-liquid interface 7 at the upper end of the air lift 13. , slowly settles and suspends in the raw water to form the first carrier part 11. Therefore, the raw water is first decomposed in this first carrier part 11 so that the BOD concentration is 1.0, for example.
00 p, plm, 200-300 p, p, m,
decreases to Next, the raw water rises between the inner cylinder 8 and the intermediate cylinder 10 as shown by the arrow, and reaches the second carrier part 12. A blower pipe 19 is provided at the lower part of the second assembly part 12, and the blower 2
Since surplus air above the inner cylinder 8 is blown out through 0,
The raw water is further decomposed by contact with the carrier and aeration, and the BOD concentration is reduced, for example, from 200 to 300 p, p, m to about 50 p, p, m. Next, the treated water reaches the inside of the tank body 1 through the gap between the outer cylinder 9 and the hollow inverted cone 4, and is discharged through the treated water discharge pipe 27 and the valve 28.

The pressure inside the tank body 1 exceeds 1 kg/cm2,
It is preferably maintained at 2 to 3 kg/cm2,
Pressure adjustment is possible by interlocking controllable pressure switch 30.
and by valve 31. That is, if the pressure rises too much, the valve 31 is opened to release air and adjust the pressure.

Note that a safety valve (not shown) is naturally installed to prevent accidents due to abnormal pressure rise within the tank body 1. Although naturally related to the above pressure adjustment, the gas-liquid interface 7 is monitored by a liquid level gauge 29. In other words, when the gas-liquid interface 7 rises, the valve 2 connected to the liquid level gauge 29 so as to be controllable in conjunction with the liquid level gauge 29
6 is activated to draw out and circulate a portion of the treated water in the tank body 1 to the bypass pipe line 25, thereby stopping the supply of raw water. On the other hand, if the gas-liquid interface 7 exceeds the lower limit of the predetermined range due to continued discharge of treated water, the liquid level gauge 29
The valve 26 interlocked with is closed, and raw water is supplied from the raw water supply pipe 23 again. Note that the activity of the carrier suspended in raw water decreases when it comes into contact with the raw water, but it has the effect of peeling off deposits on the surface due to contact and rubbing between the carriers. Since it comes into contact with raw water having a BOD concentration, the amount of deposits is naturally larger than that of the second carrier part 12. For this purpose, the air lift 1 opens at the bottom of the first carrier part 11.
By guiding the body into the air lift 13 as shown by the arrow and rapidly raising it inside the air lift 13, the deposits on the surface of the body are once removed. In this case due to the presence of an inorganic carrier.

It is possible to efficiently remove deposits from an organic carrier having a flexible surface.

In this embodiment, an example was shown in which the cross section of the tank main body was formed into a circular shape, but the effect is the same even if the cross section is a polygon. Also, the pressure inside the tank body.

It is necessary to pressurize to 1 kg/cm" or above atmospheric pressure to increase oxygen absorption efficiency, but if the pressure is too high, it will be necessary to strengthen the equipment components and there will be problems in terms of operation and maintenance. 10kg/ because it becomes complicated.
cm2, preferably 2 to 3 kg/cm".Furthermore, the filling amount of organic carrier and inorganic carrier, shape 2 particle size 1 distribution, etc. should be appropriately selected in accordance with the properties of the raw water to be treated. and is not limited to those described in the above examples.

In addition, when treated water treated using a carrier as in the present invention is subjected to post-aeration sedimentation treatment, it is usually difficult to separate the sludge compared to the conventional standard activated sludge method. Methods include using a medium in which substances are organized into a net or gourd shape, or adding a flocculant. However, in the present invention, raw water is subjected to biological treatment under pressure, and the treated water can be directly charged into a pressure flotation device for treatment.

In other words, by simply connecting a known pressurized levitation device,
Complicated processes such as those described above can be omitted. In this case, the pressure is preferably about 1.5 kg/cm2.

(Effect of the invention) Since the present invention has the structure and operation as described above,
It has the following effects.

(11 In the conventional standard activated sludge method, the BOD-tank volume j! and load were approximately 0.6 kg BOD/m3-day (but it is not possible to increase this to 10 kg BOD/m3-day or more). can.

(2) Oxygen absorption efficiency, which was conventionally about 8 to 10%, can be significantly improved to 30% or more.

(3) By arranging separate treatment tanks within the same tank instead of separate treatment tanks, the apparatus can be made more compact and optimal processing can be performed for both high-load processing and low-load processing.

(4) The air for aeration in the second carrier section, that is, the low-load processing section, can utilize the surplus air remaining in the upper part of the air lift, so less power is required.

[Brief explanation of drawings]

The figure is a vertical sectional view schematically showing an embodiment of the present invention. 1: Tank body, 8: Inner cylinder, 9: Outer cylinder, 1o: Intermediate cylinder,
13: Airlift), 23: Raw water supply pipe. 27: Treated water discharge pipe.

Claims (5)

[Claims] (1) A hollow inverted conical body is fixed to the lower end of a hollow cylindrical body having a vertical shaft and a lid to form a tank body. An inner cylinder and an outer cylinder are each coaxially suspended from the lid which forms the liquid surface and forms the tank body through a gap with the bottom of the tank body, and the cone-shaped body which forms the bottom of the tank body An intermediate cylinder is coaxially arranged between the inner cylinder and the outer cylinder so that its upper end is located below the gas-liquid interface, and a first carrier part and a first carrier part are disposed inside and outside the intermediate cylinder, respectively. A second carrier part is formed, the first carrier part is provided with an air lift whose upper and lower ends are opened to the gas part and the liquid part, and connected to a compressor, and a fumarole pipe is provided in the lower part of the second carrier part. The pressurized type is characterized in that the upper part of the inner cylinder and the fumarole pipe are connected via a blower, the upper part of the inner cylinder is provided with a raw water supply pipe, and the outer wall of the tank body is provided with a treated water discharge pipe. bioreactor. (2) If the pressure inside the tank body exceeds 1 kg/cm^2
0 kg/cm^2 or less, preferably 2 to 3 kg/cm^
2. The pressurized bioreactor according to claim 1, which is (3) Claim 1 in which the carriers present in the first carrier part and the second carrier part are an organic carrier and an inorganic carrier.
The pressurized bioreactor according to item 1 or 2. (4) Claim 3, wherein the capacities of the organic carrier and the inorganic carrier are 15% by volume and 10% by volume of the effective volume, respectively.
The pressurized bioreactor described in Section 1. (5) The pressurized bioreactor according to any one of claims 1 to 4, wherein the tank body comprises a hollow cylinder and a hollow inverted cone.