JPH01218695A - Anaerobic treatment tank - Google Patents

Abstract

PURPOSE:To enhance treatment efficiency, by parallelly arranging inclined plates allowing sludge particles to sediment to receive the same on the upper surfaces thereof above a sludge bed and forming recessed and protruding parts to the under surfaces of the inclined plates. CONSTITUTION:Org. waste water D is subjected to digestive treatment by a sludge bed 1 to be allowed to flow out upwardly. Sludge particles S flowing out along with generated bio-gas sediment while flow between inclined plates 30 to be recovered on the lower sludge bed 1 along the upper surfaces 31 of the inclined plates 30. The sludge particles S advancing on the under side of the inclined plates 30 collide with each other while move from recessed sections 36 to protruding sections 34. Gas G is separated from the sludge particles S by said collision. The particles S fall along the upper surfaces 31 and the gas G is discharged from an outlet 25 through a gas collection chamber 24. By this method, waste water can be smoothly treated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an anaerobic treatment device, and particularly to a device for decomposing organic wastewater by utilizing the biological properties of anaerobic microorganisms.

[Prior Art] As an apparatus for treating organic wastewater with anaerobic microorganisms, there is, for example, a sludge brangutsu l-type apparatus.

As shown in FIG. 9, conventional equipment of this type forms a sludge bed (sludge blanket) 1 containing mainly anaerobic microorganisms in a container 2, and also directs organic wastewater Q upward from the bottom 3. The sludge is brought into contact with the sludge bed 1 in the flow, and subjected to anaerobic digestion to be decomposed into biogas G such as methane gas (CH4) and carbon dioxide (CO2). The decomposed water W is drained out of the container 2 from above the sludge bed 1. In addition, the generated scum G is a funnel-shaped lid member 4.
It is adapted to be extracted from a waste collecting section 5 consisting of.

This device has the advantage of increasing the decomposition efficiency by increasing the concentration of organic substances contained in the wastewater Q.

In this device, the scum G generated during digestion is
water rises in the sludge and disturbs the sludge bed 1, causing treated water W and sludge S
Since it becomes difficult to separate the solid-liquid separation section 6 from the digestion reaction section 6, the solid-liquid separation section 7 is divided into sections.

In addition, floating sludge is generated in which sludge particles S are combined to surround the generated gas G, so it is necessary to sufficiently separate the sludge G before it flows into the solid-liquid separation section 7.
Various devices have been proposed that have the function of three-phase separation of sludge G (air) - sludge S (solid) - water W (liquid).

For example, as shown in FIG. 10, there is a system in which a trough-like partition plate 8 with an inverted triangular cross section is provided above the sludge bed 1, and a detour passage 10 is formed at the lower end apex 9 of the partition plate 8.

According to this proposal, water W and waste G are directed upward (indicated by arrow A), and sludge particles S are guided to solid-liquid separation section 7 (arrow B).
In other words, the sludge particles S flowing out are separated, and furthermore, the water W and the waste G are separated by the partition passage 12 formed separately above the container 11.

[Problems to be Solved by the Invention] However, among the above-mentioned conventional techniques, in the configuration shown in FIG. If there is a large amount of floating sludge, the processing capacity will be reduced.

As a countermeasure against this, it is possible to provide a mechanical stirring device or the like in the waste collection section 5, but equipment costs, operating costs, maintenance and management, etc. become problems, especially in devices with a large processing scale.

In addition, in the configuration in which the partition plate 8 is provided (FIG. 10), although it functions to some extent for solid-liquid separation, it is difficult to recover the floating sludge particles S (solid-gas separation) during the detour. However, floating of sludge to the waste collection section is also unavoidable. Furthermore, since the inlet of the detour is located in a limited position, the flow path area is smaller than the area of the upper surface of the sludge bed 1. When doing so, the current tends to drift and a dead space is likely to occur. Especially when it is low concentration wastewater,
This becomes a problem because the stirring and mixing effect due to the generated scum G cannot be expected.

In view of the above circumstances, the present invention was devised to provide an anaerobic treatment device that can separate and recover floating sludge in addition to separating treated water and sludge particles.

Means for Solving 1 Problem] The present invention provides an apparatus for decomposing organic wastewater by supplying it from below the sludge bed into a container having a sludge bed mainly composed of anaerobic microorganisms. Above the sludge bed, sloping plates are installed in parallel to allow the sludge particles that flow out with the water after treatment to settle and receive them on two sides, and the lower surfaces of these slanted plates take in the generated decomposed gas and float it to the surface. A concavo-convex portion is formed to guide sludge particles along the inclined plate to the side where a predetermined gap occurs in the vertical direction.

"Function" With the above configuration, the inclined plate settles the sludge particles flowing out from the sludge bed together with the treated water and collects them into the sludge bed. The uneven portion formed on the lower surface of the sloping plate once guides the floating sludge to the side, and then raises it directly upwards due to its buoyancy, causing it to collide with the sloping plate and separating it from the generated sludge.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the anaerobic treatment apparatus according to the present invention, which, like the conventional one, has a sludge bed 1 containing anaerobic microorganisms inside. An inflow part 22 for supplying organic wastewater Q in an upward flow into the closed container 21, an outflow part 23 for flowing the treated water W out of the container 21, and extracting the generated biogas G. A waste collection chamber 24 and a waste outlet 25 are provided for this purpose.

In this embodiment, the container 21 has a substantially rectangular parallelepiped shape, and the inflow section 22 has a perforated pipe 26 arranged so that the sludge flows uniformly into the metal area with respect to the sludge bed 1. Become.

Further, the outflow section 23 is composed of a water collection trough 28 having rectangular openings 27 arranged in parallel when viewed from above, and the treated water W overflowing from the openings 27 is collected in one corner 29 and discharged. .

An inclined plate 30, which is a feature of the present invention, is provided above the sludge bed 1 and below the water collection trough 28. These inclined plates 30 are arranged at equal intervals so as to cover the entire surface of the sludge bed 1, and by guiding the soil flow along the inclined angle (approximately 60 degrees), the sludge particles S It is designed to stir up sedimentation.

As shown in FIG. 3, the upper surface 31 of the inclined plate 30 is formed into a smooth surface that receives the sludge particles S and collects them into the sludge bed 1 below, while the lower surface 32 on the opposite side for,
An uneven portion 33 having a wavy cross section is formed.

The convex section 34 guides the sludge particles S floating along the lower surface 32 of the inclined plate 30 along the rising curve, thereby moving laterally from the inclined axis 35, to the right in the figure. They are moved to create a predetermined vertical separation. Further, the concave section 36 is suitably depressed so as not to come into contact with the sludge particles S when they rise from near the apex of the convex section 34 almost directly above.

Next, the operation of this embodiment will be explained.

The organic wastewater Q supplied from the inflow section 22 is subjected to a known digestion treatment in the sludge bed 1, and then is discharged above the sludge bed 1. At this time, the sludge particles S, which are influenced by the generated biocass G and flow out together, settle while flowing between the inclined plates 30 and are collected in the sludge bed 1 below along the upper surface 31.

On the other hand, the sludge particles S that take in the gas G and move up under the inclined plate 30 due to its buoyancy move along the concave section 36.
When moving from the convex section 34 to the convex section 34, it leaves the surface and rises freely, colliding in the next concave section 36 to the convex section 34. This impact separates the sludge particles S from the sludge particles G, which are weakly bonded. Collisions occur one after another along the uneven portions 33, and as the particles S separate, the rising speed further increases, promoting separation. The separated particles S, as shown by the broken line arrow in the figure, are similar to the sedimented particles S on the upper surface 3.
Fall along 1. In this way, the waste G becomes a float floating in the water W, and is easily separated when overflowing from the opening 27 of the water collection trough 28, passing through the waste collection chamber 24 to the outlet 2.
4JP is issued from 5.

In this way, the sludge particles S floating by the sludge G are guided in a stepwise manner and are separated by repeated collisions caused by buoyancy, so that the sludge particles S can be collected efficiently and reliably. can do. Thereby, the waste G can be smoothly taken out without the waste G outlet 25 being blocked. Furthermore, since the buoyancy of the floating particles themselves is utilized, a stirring device or the like is not required.

Furthermore, since this inclined plate 30 can be provided to cover the entire surface of the sludge bed 1, uniform separation without dead spaces etc. can be performed.

Next, a second embodiment will be explained with reference to FIGS. 4 and 5.

This embodiment differs from the first embodiment in that a shade-shaped waste collection member 41 is provided at the upper end of the inclined plate 30 to take out the generated waste G. This waste collection member 41 has a single-sided structure, and its end portion 42
are connected to each other, and the collected waste G is sent to one outlet 4.
JIF has been issued since 3.

With this configuration, the container 44 can be made into an open type, and the structure for the outflow portion 23 and gas collection can be simplified. Further, it is desirable that both ends of the member 41 be closed with a backing plate 45 or the like to prevent waste bubbles from escaping.

In the above embodiment, only the inclined plates 30 inclined in the same direction were provided, but as shown in FIG. 6, inclined plates 51 having different directions may be provided in multiple stages. In this case, in order to prevent the flow paths of gas G and water W (not shown by broken lines and dashed-dotted lines, respectively) from intersecting, a partition plate 43 parallel to the inclined plate 51 is provided at the remainder d1 in the folded section 52. (See Figure 7).

Further, the shape of the uneven portion 33 is not limited to a wavy shape,
For example, it may have a linear cross section as shown in FIG. In this case, it is desirable that the surface 61 connecting the convex section 34 to the concave section 36 forms an angle of 90 degrees or more with the horizontal so that an effective collision force is generated.

Further, the pitch of the unevenness, the total number, the interval between the inclined plates, etc. are not limited to the illustrated example, and may be selected depending on the scale of processing and the like.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are achieved.

(1) Since inclined plates having uneven portions on the lower surface are arranged above the sludge bed, floating sludge is reliably separated and recovered, improving processing capacity and smooth removal of waste.

(2) Since it is possible to collect water uniformly, it is possible to prevent a decrease in reaction efficiency due to the formation of dead spaces.

(3) Since a stirring device etc. is not required, operating costs etc. do not increase.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a first embodiment of the anaerobic treatment apparatus according to the present invention, FIG. 2 is a cutaway view along the line ■-■ in FIG. 1, and FIG. FIG. 4 is a side view showing the main parts, FIG. 4 is a side view showing the second embodiment, FIG. 5 is a side view showing the main parts, and FIG. 6 is another view of the inclined plate in FIG. FIG. 7 is a side view showing another example of the inclined plate, FIG. 8 is a side view showing another example of the uneven portion, and FIG. 9 is a side view showing the conventional anaerobic plate. FIG. 10 is a side view of the anaerobic treatment apparatus, and FIG. 10 is a perspective view of another conventional anaerobic treatment apparatus. In the figure, 1 is a sludge bed, 30 is an inclined plate, and 33 is an uneven portion. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative patent attorney: Nobuo Kinutani-56

Claims (1)

[Claims] 1. In a device that decomposes organic wastewater by supplying it from below the sludge bed into a container with a sludge bed mainly composed of anaerobic microorganisms, it flows out together with the treated water above the sludge bed. Inclined plates are installed in parallel to allow the sludge particles to settle down and receive them on the upper surface, and the sludge particles that float up by taking in the decomposed gas generated are placed on the lower surface of the inclined plate in a predetermined direction in the vertical direction along the inclined plates. An anaerobic treatment device characterized by forming an uneven portion leading to the side where a gap occurs.