JPS588322Y2 - Inclined plate sedimentation tank for activated sludge treatment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an inclined plate settling tank for activated sludge treatment.

The most commonly used domestic wastewater treatment method is the activated sludge method.The feature of this method is that air is sent into the sewage water in an aeration tank to aerate the water, and then solidified in a settling tank. The purpose is to separate the liquid.

Conventionally, the sedimentation tank in this case is circular or square, with sloping side walls, and solid-liquid separation is achieved through natural sedimentation. ,
It had the disadvantage of low processing power.

The present invention aims to eliminate these conventional drawbacks, promote solid-liquid separation, improve processing capacity, and at the same time make the tank more compact.

The illustrated embodiment will be described below.

Fig. 1 shows an embodiment of the settling tank according to the present invention, in which the bottom 2 of the square tank main body 1 is approximately 45 to 6 mm thick in half.
0, and the other half is a horizontal portion 2b, and a groove-like portion 2C is formed between the slope portion 2a and the horizontal portion 2b.

Inside the tank body 1, a plurality of inclined plates 3 are arranged in parallel along the inclined part 2a of the bottom 2, and the upper and lower ends of these inclined plates 3 are arranged vertically. They are all flush.

Incidentally, the inclined plates 3 may be flat plates, corrugated plates, or the like.

In addition, the inclined plate 3 is located at the horizontal portion 2b.
A rectifying plate 4 made of punched metal or the like having a large number of through holes is erected facing the . The overflow gutter 6 has a large number of notches 6a for overflow, and the overflow gutter communicates with a drain pipe 7 fixedly fixed to the tank body.

Furthermore, inside the tank body 1, inclined plates 3...treated water bulkheads 8, which also serve as supports, are installed along the inspection surface of the overflow gutter 6 at appropriate intervals, and are installed vertically from the top of the tank body. It is equipped with a traveling air lift pump 9 having a suction pipe 9b that enters the tank and whose lower end reaches the groove 2C of the bottom 2, and the traveling air lift pump 9 has a hose 9a, The sludge that has accumulated in the groove-shaped portion 2C is sucked and discharged while moving laterally along the groove.

Note that a sludge discharge device having a siphon or a screw scraper may be used instead of the air lift pump.

Next, FIG. 2 shows an example of the use of the above-mentioned settling tank, where A is a settling tank with a screen Aa, B is an adjustment tank with a blower-Ba, C is an aeration tank with a blower-Ca, and D is an aeration tank with a blower-Ca. In the settling tank according to the present invention, E is a discharge tank, and F is a sludge storage tank.

The raw water of domestic wastewater first enters the settling tank A, where the dust is removed, and then brought to the adjustment tank B.

The adjustment tank adjusts the flow rate, and since it is also equipped with a blower Ba, it has aeration performance.

The raw water in the adjustment tank B is quantitatively supplied to the aeration tank C via the pump Pa.

In the aeration tank C, air is sent into the raw water by the blower Ca, and the raw water comes into contact with the air.

The raw water in the aeration tank C is sent to the settling tank according to the present invention, where it is separated into solid and liquid.

Here, the operation of the settling tank according to the present invention shown in FIG. 1 will be explained in detail.

The raw water sent to the settling tank first enters the cushion chamber 5.
to go into.

Then, due to the water pressure, the sludge mixed in this flows horizontally through the many holes in the straightening plate 4 toward the inclined plate 3 in a laminar flow (horizontal flow), and the sludge mixed in this has a settling effect. , the sludge is stopped by the inclined plate 3... and the inclined part 2a of the bottom of the tank body 2, and the water that has separated the sludge rises along the inclined plate 3... and the inclined part 2a of the bottom of the tank main body, The water flows to the top, flows into the overflow gutter 6, is discharged as treated water from the drain pipe 7, and is sent to the discharge tank E.

On the other hand, the sludge that has been stopped by the inclined plate 3... and the inclined part 2a at the bottom of the tank body is moved by its own weight to the inclined plate 3...
・And it slides down the slope part 2a and falls into the groove-like part 2c of the bottom 2 of the tank body and is deposited thereon.

The sludge deposited in this groove-shaped portion 2C is sucked up by the traveling air lift pump 9 and brought to the sludge storage tank F.

At this time, the water sucked up at the same time is returned to the aeration tank C again.

The treated water flowing into the discharge tank E is discharged into a river by a drainage pump pb, and the sludge in the sludge storage tank F is appropriately processed into a cake or the like and used for landfilling or the like.

According to the sedimentation tank of the present invention, the raw water becomes a horizontal laminar flow and reaches the inclined plates 3... and the inclined part 2a at the bottom of the tank body, and the raw water is uniformly sent between all inclined plates. The treatment efficiency of raw water is improved, and since the sludge deposition time only needs to be considered mainly due to the short distance from the rectifying plate 4 to the inclined plate 3..., solid-liquid separation is extremely fast, and the introduced raw water is The residence time until separation and discharge can be shortened to 4 to 3 times the conventional time, and the processing capacity can be improved to 1 m.

In addition, a sloped portion 2a of the bottom 2 of the tank body and a number of sloped plates 3 are provided.
The sludge can be scraped up easily and quickly, and since it is collected at the bottom, it can be easily discharged with an air lift pump, etc. Moreover, as mentioned above, the tank can be made smaller and costs can be reduced. can do.

Furthermore, the upper and lower ends of each inclined plate are arranged on the same vertical plane, and the wastewater that has passed between the inclined plates flows upward along the upper edge of each inclined plate, which is flush with the vertical plane. There is no chance that the water will mix with the raw water flowing into the tank and interfere with the treatment of the raw water.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a schematic diagram showing an example of a system using the tank shown in FIG. 1 according to the present invention. 1... Tank body, 2... Bottom, 3...
... Inclined plate, 4 ... Current plate, 5 ... Cushion chamber, 6 ... Overflow gutter, 7 ... Drain pipe.

Claims (1)

[Scope of utility model registration request] Approximately half of the bottom 2 of the square tank body 1 is an inclined part 2a, and the other approximately half is a horizontal part 2b or an appropriately inclined part, and the bottom 2
A groove-shaped part 2c for depositing sludge is formed between the inclined part 2a and the horizontal part 2b, and a plurality of inclined plates 3 are connected to the inclined part 2a.
A punching hole is arranged in the tank body 1 parallel to the above and with the upper and lower ends aligned with the vertical plane, and has a large number of through holes facing the inclined plate 3 at the horizontal part 2b etc. A rectifying plate 4 made of metal or the like is erected to form a cushion chamber 5 divided by this, and an overflow gutter 6 is provided in the upper part of the seed body, and a drain pipe T is connected to this. Inclined plate type in activated sludge treatment