JPS5847239B2 - Oxidation ditch sedimentation basin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide an oxidation groove sedimentation tank having a novel configuration.

The details of one embodiment of the present invention will be described below with reference to the drawings.

1 is the oxidation groove sedimentation basin of the present invention.

The structure is that the oxidation groove 2 is formed into an oval shape when viewed from above.
A rotating body 3 is provided at the top, and the first
A first settling tank 6 and a second settling tank 7 are connected to each other via a blocking plate 4 and a second blocking plate 5, and a first rotating body 8 and a second rotating body 9 are connected to the first and second settling tanks. are arranged respectively,
In addition, first and second overflow weirs 6A and 7A are attached to the first and second sedimentation tanks, respectively, so that the sedimentation treatment cycles of the first and second sedimentation tanks are operated alternately to prevent polymerization. It is configured.

The first and second rotary bodies 8.9 of the rotary body 3 are rectangular aeration blades 3A, 8 arranged in a constant staggered manner on a horizontal virtual cylindrical surface.
A and 9A are configured in a comb-like radial type.

The portion where this rotating body 3 is rotatably attached to the oxidizing groove 2 in a direction perpendicular to the longitudinal direction of the oxidizing groove becomes an oxidizing groove aeration device 10.

In this case, the rotating body is configured to rotate at a higher number of revolutions than a preset number of revolutions or a number of revolutions depending on dissolved oxygen in the oxidation groove.

The rotational speed of the rotating body is controlled by a block diadam as shown in FIG.

Furthermore, this device 10 has a simple A0 mechanical structure, is easy to maintain, and is capable of supplying sufficient oxygen.

B. Aeration and recirculation are fully effective, resulting in high BOD.

COD removal rate is obtained.

A high removal rate of C, ammonia nitrogen, and nitrite nitrogen can be obtained.

D. High aeration effect can be obtained with low noise.

E. Sufficient OD and COD removal rates can be obtained even at low water temperatures.
No special treatment is required even if the temperature drops to 1°C.

F, extremely little surplus sludge, S, V, I.

(S fudge Volume Index) is small and sludge treatment is easy.

G. It can be produced at low cost considering its aeration effect.

Generates uniform circulation and mixed flow in the H0 oxidation groove to prevent sludge settling.

Further, the first and second blocking plates 4 and 5 are blocking plate bodies 4A having buoyancy.

5A is attached to the side walls of the first and second sedimentation basins using a pin P, and balance adjustment weights 4B and 5B are attached above the main bodies 4A and 5A.

Reference numeral 11 indicates a treated water pipe, and 12 indicates an initial overflow return pipe.

Next, the functions and effects of the present invention will be explained in detail.

First, the rotating body of the first sedimentation tank is rotated to allow sludge-mixed sewage to flow into it.

At this time, the blocking plate is tilted due to the flow, allowing the sludge mixed water to easily flow in.

When the machine rotates for a certain period of time according to a preset timer and then stops, the blocking plate comes to an almost upright position and prevents sludge from flowing in from the oxidation groove.

From this point on, the sludge in the sedimentation tank will settle, and after a certain period of time, the supernatant will overflow from the overware.

When overflow begins, the sludge that has entered the overflow weir is returned to the oxidation ditch via the control valve and piping.

After time has elapsed for no sludge to be mixed in the supernatant, it is sterilized and released as treated water.

After overflowing for a certain period of time, the automatic control valve of the overflow pipe is fully closed, and the sedimentation treatment cycle of the first sedimentation tank is completed.

On the other hand, the second sedimentation tank performs sedimentation separation from the sludge inflow in the same process as the first sedimentation tank in a time-shifted cycle to prevent polymerization with the overflow of the first sedimentation tank, and the first and second sedimentation tanks are used alternately. overflows into

The above precipitation process is performed by automatic sequence control in the time series shown in FIG.

In FIG. 6, the one-dot chain line indicates inflow, the two-dot chain line indicates sedimentation, the three-dot chain line indicates overflow, 6 indicates one cycle of the first settling tank, and 7 indicates one cycle of the second settling tank.

As a result, in the present invention, A, the oxidation groove, and the sedimentation tank are integrated, and the facility and structure can be simplified.

B. Since the flow from the oxidation groove to the settling tank is aerated with a rotating body, it promotes self-oxidation of microorganisms, prevents sewage from becoming anaerobic, and reduces the generation of excess sludge.

Due to the installation effect of the blocking plate made of a material with a specific gravity lighter than C1 water, even if it is directly connected to the oxidation groove, the mixing of sludge into the settling basin is reduced independently of the circulation of the oxidation groove.

D. There is no need to pull out sediment and return it, so maintenance is unnecessary.

E. Stable precipitation treatment can be operated unmanned.

F. Sufficient precipitation separation is possible at shallow depths.

This is a useful invention with many advantages.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is an enlarged sectional view taken along the line A-A of the same, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. is an enlarged view of arrow B in Figure 1,
Fig. 5 is an enlarged sectional view taken along the line C-C of the same as above, Fig. 6 is an explanatory diagram of the operating cycle of the first and second sedimentation tanks, and Fig. 7 is an illustration of the rotating body 1.
A front view with the section cut away, FIG. 8 is a sectional view taken along the line D-D as above,
FIG. 9 is a sectional view taken along the line E-E in FIG. 7, and FIG. 10 is a rotation speed control block diaphragm. 1... Oxidation ditch sedimentation tank, 2... Oxidation ditch,
4, 5... Blocking plate, 6, 7... Sedimentation tank, 3, 8, 9... Rotating body.

Claims (1)

[Claims] 1. A first sedimentation tank and a second sedimentation tank are connected to the oxidation groove formed in an oval shape in plane through a first blocking plate and a second blocking plate that rise and fall depending on the flow of water, and the first and second sedimentation basins are A first rotating body and a second rotating body are respectively disposed in the sedimentation basin, and first and second overflow weirs are respectively attached to the first and second sedimentation basins, and the first and second overflow weirs are attached to the first and second sedimentation basins, respectively. An oxidation groove sedimentation tank characterized in that each sedimentation treatment cycle of the sedimentation tank is configured to operate alternately to prevent polymerization.