JPH0663321A - Inclined plate type settling chamber - Google Patents

Abstract

PURPOSE:To provide the inclined plate type settling chamber which is hardly clogged and can efficiently separate the suspended solids in sewage even in the case of a treatment of the sewage contg. the high-concn. suspended solids. CONSTITUTION:A filter medium packed part 6 packed with floating filter media having <=1.0 sp. gr. is provided above an inclined plate disposition section 4 having many inclined plates 5. The suspended solids are removed by the inclined plates 5 and the floating filter media when the water to be treated is run upward. An air introducing pipe 9 is provided in the lower part of the inclined plate disposition section 4. Air is blown by this pipe and the water level is lowered, by which the suspended solids sticking to the filter media are removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a slant plate type precipitation tank.

[0002]

2. Description of the Related Art A tilted plate type settling tank means a settling tank in which a large number of tilted plates (tilted plates) 12 are arranged inside a tank 11 as shown in FIG. In the structure of FIG. 2, 13 is a collecting gutter, 14 is a clear water gutter, and 15 is a clear water outflow pipe. Such an inclined plate type precipitation tank can increase the sedimentation area of the precipitation tank by the inclined plate 12 and improve the flow condition in the tank, so that the treatment efficiency of the precipitation tank can be improved.
Widely used mainly as a settling tank for waterworks.

However, in such an inclined plate type precipitation tank,
Sludge is likely to adhere between the narrow inclined plates, resulting in clogging or scumming. Since the tendency is particularly remarkable in the treatment of wastewater containing high-concentration suspension, it has been considered difficult to apply the inclined plate type sedimentation tank to the primary treatment of sewage.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, prevents clogging even when treating sewage containing high-concentration suspensions, and efficiently disperses suspensions in sewage. It was completed to provide a slant plate type sedimentation tank that can be separated.

[0005]

The inclined plate type settling tank of the present invention, which has been made to solve the above-mentioned problems, is provided above an inclined plate arranging portion provided with a large number of inclined plates through which water to be treated flows upward. It is characterized in that a filter medium filling section filled with a levitation filter medium having a specific gravity of 1.0 or less is provided, and an air introduction pipe and a sludge discharge port are provided below the inclined plate arranging section.

[0006]

The present invention will be described in more detail below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 is a vertically long tank body having an inflow port 2 for the water to be treated and an outflow port 3 for the water to be treated in the upper part. An inclined plate placement portion 4 is provided at the center of the tank body 1, and a large number of inclined plates 5 are placed inside the inclined plate placement portion 4 at regular intervals. The interval between the inclined plates 5 is not particularly limited, but is set to about 100 mm in the embodiment. The water to be treated supplied from the inflow port 2 flows upward through the inclined plate arranging portion 4.

A filter medium filling section 6 is provided above the inclined plate arranging section 4. The filter medium filling section 6 is filled with a floating filter medium having a specific gravity of 1.0 or less. The shape and material of the floating filter material are not particularly limited, and for example, a filter material made of synthetic resin or fiber is used. However, since the levitation filter medium needs to be able to freely pass between the inclined plates 5, its diameter is preferably 40% or less of the interval between the inclined plates 5. In the embodiment, a filter medium having a diameter of 40 mm or less is used. .

A sludge collecting section 7 is provided below the inclined plate arrangement section 4. The bottom of the sludge collecting tank 7 has a funnel shape for collecting the sludge flowing down from the lower end of the inclined plate 5, and a sludge discharge port 8 is provided at the lower end thereof. Further, between the sludge collecting section 7 and the inclined plate arranging section 4, an air introducing pipe 9 and the inflow port 2 of the water to be treated are provided.

[0009]

The slant plate type settling tank of the present invention having the above-described structure has the slant plate arrangement portion 4 between the slant plates 5 of the treated water such as sewage introduced from the untreated water inlet 2 and the filter medium. It is configured such that the purified water is made to flow upward through the space between the levitation filter media of the filling part 6 and the purified water is taken out from the outflow port 3 of the water to be treated. During this period, the suspension having a relatively large particle size is precipitated on the inclined plate 5, and the suspension having a relatively small particle size can be removed by the floating filter medium. Therefore, the suspension can be efficiently separated.

When the inclined plate 5 and the floatable filter medium are blocked by the trapped suspension by continuing such an operation, first the inflow of water to be treated is stopped and the air introduction pipe 9 is introduced.
Blow air from. As a result, the levitation filter medium in the filter medium filling section 6 is vigorously flown and agitated by the air, and the trapped suspension that has adhered is separated from the filter medium. Therefore, the water in the sludge collecting tank 7 is drained from the bottom, and is drained until the water surface is at least lower than the lower end of the inclined plate 5. Then, not only the trapped suspension separated from the buoyant filter medium flows out together with water, but also the buoyant filter medium that descends as the water level lowers removes the suspension adhered to the surface of the inclined plate 5 and moves downward. It is dropped and discharged. After the suspended matter is removed in this way, the water to be treated may be introduced from the inflow port 2 to restart the operation.

[0011]

As described above in detail, in the inclined plate type precipitation tank of the present invention, the water to be treated is relatively flown by flowing the water to be treated through the inclined plate arrangement portion 4 and the filter medium filling portion 6 located above the inclined plate arrangement portion 4. The suspension having a large particle size can be settled on the inclined plate 5, and the suspension having a relatively small particle size can be removed by the floating filter medium. Further, when the inclined plate 5 and the buoyant filter medium start to be clogged with the trapped suspension, air is blown from the air introduction pipe 9 below the inclined plate arrangement portion 4 and the water level is lowered to raise the levitation. Not only can the trapped suspension separated from the filter medium be removed, but also the trapped suspension on the surface of the inclined plate 5 can be removed by the floating filter medium that descends as the water surface decreases. Therefore, according to the present invention, the inclined plate type precipitation tank can be applied to the primary treatment of sewage containing a high-concentration suspension, which has been conventionally difficult to apply.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a typical example of a conventional inclined plate type precipitation tank.

[Explanation of reference numerals] 4 inclined plate arrangement portion 5 inclined plate 6 filter medium filling portion 8 sludge discharge port 9 air introduction pipe

Claims (1)

[Claims] 1. A filter medium filling section filled with a levitation filter medium having a specific gravity of 1.0 or less is provided above the inclined plate arrangement section having a large number of inclined plates through which the water to be treated flows upward, and the inclined plate arrangement section is also provided. An inclined plate type precipitation tank characterized in that an air inlet pipe and a sludge discharge port are provided in the lower part of the.