JPH0352159Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a fluidized bed reactor used in the anaerobic treatment of wastewater containing organic substances.

Conventional technology Conventionally, when waste liquid containing organic substances is subjected to biological treatment using anaerobic bacteria, the anaerobic bacteria are supported on a carrier such as vermiculite or vermiculite, and are allowed to flow through the liquid to be treated for digestion ( In this method, the fluidized bed reactor used has an inverted conical bottom plate, and the fluid is blown up vertically to fluidize it.

Problems that the invention aims to solve As mentioned above, in a fluidized bed reactor with an inverted conical bottom plate, when the reactor is enlarged, the bottom plate is inverted conical shape, so the volumetric efficiency is low, and support legs etc. Moreover, channeling tends to occur in the liquid flow, making it difficult to uniformly flow the carrier, resulting in a lack of operational stability.

The present invention aims to solve the above-mentioned problems in a fluidized bed reactor, to form a uniform fluidized bed, and to provide a fluidized bed reactor with excellent operational stability.

Means for Solving the Problems The fluidized bed reactor of the present invention is a fluidized bed reactor in which a carrier supports anaerobic bacteria and fluidizes a liquid to be treated, in which the bottom plate is a flat plate, and A conical liquid flow accelerating member is provided in the center, and an injection nozzle capable of injecting liquid in the circumferential direction of the inner wall to generate a swirling flow is provided at the lower end, rising from the bottom to the middle part. The present invention is characterized in that a means for resisting the swirling flow is provided.

Function In the fluidized bed reactor of the present invention, since the bottom plate is a flat plate, the effective volume increases, and by injecting liquid from the injection nozzle arranged at the lower end in the circumferential direction of the inner wall of the reactor, a conical shape is generated. The presence of the liquid flow accelerating member forms a swirling flow that is faster at the bottom, making it possible to float and fluidize the carriers that are about to settle down without creating a dead space. The swirling flow that comes is disturbed by a resistance means such as a baffle plate installed in the middle part or a jet nozzle that sprays liquid in the opposite direction, and converted into an upward flow, and the centrifugal force of the swirling flow causes the carriers to gather on the inner wall. It is possible to prevent uneven distribution and form a uniform fluidized bed.

Embodiment An embodiment of the present invention will be described based on the drawings. 1 to 3 show an embodiment of the present invention, in which a bottom plate 3 of a circular reaction tank body 2 of a fluidized bed reactor 1 is formed of a flat plate, and a conical liquid flow accelerator is provided at the center of the bottom plate 3. A member 4 for use is provided. Furthermore, an injection nozzle 5 capable of injecting liquid in the circumferential direction of the inner wall to generate a swirling flow is installed at the lower end 2a of the reaction tank main body 2.
A plurality of (four in this example) are provided. A plurality of baffle plates 6 (four in this embodiment) are radially attached to the inner wall of the middle portion of the reaction tank body 2 at equal intervals. A gas separation device 7, an overflow port 8, a gas vent 9, etc. are installed in the upper part of the reaction tank body 2.

In the fluidized bed reactor 1 configured as described above, the raw solution to be treated and/or the upper supernatant circulating liquid is supplied to the liquid to be treated in the tank from the injection nozzle 5 disposed at the lower end 2a of the reaction tank main body 2. A swirling flow is created by injecting and supplying the fluid in the circumferential direction of the inner wall. In this case, since the conical liquid flow accelerating member 4 is provided in the center of the bottom plate 2, the speed of the swirling flow is greater at the narrower bottom of the flow path, and the faster the anaerobic bacteria in the liquid to be treated are It is possible to fluidize the supported carrier and prevent it from settling and depositing on the bottom without creating a dead space. Furthermore, the swirling flow that rises while fluidizing the carrier is disrupted by the baffle plate 6 provided inside the middle part of the reaction tank main body 2, and is converted into an upward flow, and is transformed into a swirling flow. The centrifugal force of the flow disturbs and evenly disperses the carriers, which tend to collect and become unevenly distributed on the inner wall, forming a uniform fluidized bed and allowing the digestion reaction to proceed efficiently.

4 and 5 show other embodiments. (In the figures, the same members as in Figures 1 to 3 are designated by the same numbers.)
It is provided in the middle part of the reaction tank main body 2. As a means for resisting the swirling flow, a baffle plate 6 of the embodiment shown in FIG.
Instead, an upper injection nozzle 11 is provided that injects liquid in a direction opposite to the flow direction of the swirling flow. By supplying supernatant circulating liquid etc. from this upper injection nozzle 11, the swirling flow is injected against the rising swirling flow to disturb the swirling flow, preventing uneven distribution of carriers and ensuring uniform dispersion. A fluidized bed can be formed, and carriers that have settled at the start of operation can be easily suspended.

Effects of the invention In the fluidized bed reactor of the invention, the carrier supporting anaerobic bacteria can be uniformly dispersed and fluidized in the liquid to be treated, allowing the digestion reaction to proceed efficiently and the carrier to settle at the bottom. There is no dead space that could accumulate, and the operation stability is excellent, and compared to the conventional bottom plate shape that is an inverted cone,
It has advantages such as increased volumetric efficiency, easy upsizing, no need for support legs, and low device cost.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
4 is a schematic configuration diagram showing another embodiment of the present invention, and FIG. 5 is a sectional view taken along the line CC in FIG. 4. 1...Fluidized bed reactor, 2...Reaction tank main body, 3...
...Bottom plate, 4...Member for liquid flow acceleration, 5...Injection nozzle, 6...Baffle plate, 11...Upper injection nozzle.

Claims (1)

[Scope of utility model registration request] In a fluidized bed reactor in which anaerobic bacteria are supported on a carrier and the liquid to be treated is made to flow, the bottom plate is a flat plate, a conical liquid flow accelerating member is provided in the center, and the lower end is A fluidized bed reaction characterized in that an injection nozzle capable of injecting liquid in the circumferential direction of an inner wall to generate a swirling flow is disposed at the inner wall, and a resistance means for the swirling flow rising from the lower part is provided in the middle part. vessel.