CN201848130U - Activated sludge settling tank - Google Patents

Abstract

The utility model discloses an activated sludge settling tank which comprises a settling tank body, a water inlet area, a water outlet area, a sludge discharge hole, a settling area and a sludge deposition area, and is characterized in that the settling area and the water outlet area are divided into two ends and arranged in an 'L' shape; the settling area is provided with an inclined plate forming an angle of 60-70 degrees with the horizontal direction; the settling area forms an angle of 60-75 degrees with the horizontal direction; the settling area is connected with a sludge bucket of the sludge deposition area; the water inlet area and the sludge bucket are arranged in an eccentric way; the water inlet area is provided with a horn mouth; and the water outlet area is provided with an effluent weir and a water outlet pipeline. By combining the advantages of a vertical sedimentation tank and a horizontal sedimentation tank, the activated sludge settling tank has the advantages of being simple in structure, high in removal rate of suspended matters, free from mechanical equipment and convenient in operation and management.

Description

An activated sludge sedimentation tank

technical field

The utility model relates to a sedimentation tank, in particular to a sedimentation tank for activated sludge in the sewage treatment process, and belongs to the technical field of water supply and drainage engineering.

Background technique

In the sewage treatment process, the activated sludge method has been widely used in the sewage treatment industry due to its low treatment cost. The sedimentation, concentration and reflux of activated sludge will float up after being disturbed, which affects the effluent of the sedimentation tank. Therefore, the sedimentation, concentration and reflux effect of the sedimentation tank is an important topic in the development of the sewage treatment industry.

The sedimentation tank is one of the key structures in the activated sludge process. After the microorganisms in the activated sludge treat the pollutants in the sewage, they enter the sedimentation tank together with the sewage, pass through the sedimentation in the sedimentation tank, and after concentration, part of the sludge returns, and the remaining sludge is discharged. The way of returning sludge mainly relies on water pumps to lift and return. The effects of sedimentation, concentration and return sludge directly affect the operation of activated sludge process.

There are mainly three types of sedimentation tanks commonly used at present. One is vertical flow sedimentation tank. This type of sedimentation tank is mainly used in small and medium-sized sewage treatment plants. It has high water depth and small capacity. The ability is poor, the construction is difficult, and the cost is high. One is a flat flow sedimentation tank, which has the disadvantages of uneven water distribution, large amount of sludge discharge, and large floor space. The other is the radial flow sedimentation tank. In this type of sedimentation tank, there are mechanical equipment under water, which is easy to corrode, and the distance between the equipment scraper and the bottom of the pool determines the effect of sludge concentration and scraping. For The quality of the construction was high. Actual operation data show that the removal rate of suspended solids in all three kinds of sedimentation tanks is not high, and the removal rate is generally only 50% to 60%. Therefore, it is necessary to improve the existing sedimentation tanks by combining the advantages of the three types of sedimentation tanks.

Contents of the invention

The purpose of the utility model is to provide an activated sludge sedimentation tank which does not require mechanical equipment, has good concentration and reflux effects, and has high removal efficiency of suspended matter.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an activated sludge sedimentation tank, including a sedimentation tank body, a water inlet area, a water outlet area, a mud discharge port, a sedimentation area, and a mud accumulation area, and the sedimentation area The water outlet area is divided into two ends, arranged in an "L" shape. The sedimentation area is equipped with a sloping plate at 60-70 degrees to the horizontal direction, and the sedimentation area is set at 60-75 degrees to the horizontal direction. Connected, the water inlet area and the mud bucket are arranged eccentrically, the water inlet area is equipped with a bell mouth, and the water outlet area has an outlet weir and an outlet pipe.

The water outlet weir is a toothed water outlet weir, and a baffle plate is arranged on the water outlet weir.

The mud hopper in the mud accumulation area is a conical mud hopper, and the mud hopper is set at 75-89 degrees to the horizontal. There are mud discharge pipes arranged around the mud hopper, and the mud discharge position is on the upper part of the mud hopper.

A return pipe is provided at the center of the mud hopper in the mud accumulation area, and the distance between the return pipe and the bottom of the pool is between 200 mm and 1000 mm.

The utility model combines the advantages of the vertical flow sedimentation tank and the flat flow sedimentation tank. The area of the sedimentation area greatly exceeds the area of the water intake area, the sedimentation flow rate is greatly slowed down, and the sedimentation time is longer, which is beneficial to the sedimentation of suspended matter. The settling area with a certain inclination and the set inclined plate play a greater role in the concentration of sludge, and the reflux under the action of air lift power ensures the continuity of concentration and reflux, without the need for mechanical equipment to scrape sludge and concentrate , and does not require equipment such as water pumps for lifting backflow. Under the action of air lift power, the sludge discharge pipelines arranged around can discharge sludge normally without leaving dead angles, avoiding the anaerobic digestion and floating of sludge in dead angles.

In summary, the utility model has the advantages of simple structure, high removal efficiency of suspended solids, no need for mechanical equipment, and convenient operation and management.

Description of drawings

Fig. 1 is a structural plan view of the utility model;

Fig. 2 is the structural elevation schematic diagram of the utility model;

In the picture, 1 is the water inlet pipe, 2 is the mud discharge pipe, 3 is the sedimentation area, 4 is the mud accumulation area, 5 is the outlet weir, 6 is the return pipe, 7 is the water inlet area, and 8 is the water outlet pipe.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

It can be seen from Fig. 1 and Fig. 2 that the utility model includes a sedimentation tank body, a water inlet area 7, a water outlet area, a mud discharge pipe 2, and a return pipe 6. The sedimentation area and the water outlet area are divided into two ends, which are arranged in an "L" shape. The sedimentation area is set with a sloping plate at 60-70 degrees from the horizontal direction to increase the sedimentation area. The sedimentation area is set at 60-75 degrees from the horizontal, and the sedimentation area is connected with the mud bucket in the mud accumulation area. There are two water outlet areas arranged at both ends of the "L" shape. Each water outlet area includes an outlet pipe 8 and an outlet weir 5. The outlet weir adopts a tooth-shaped outlet weir, and sludge and scum baffles are arranged on the outlet weir. Sludge scum is discharged through the scum port in the water outlet area. The water inlet area 7 is eccentrically arranged with the mud bucket, and a water inlet bell mouth is set, and the sewage enters the sedimentation area radially. The mud accumulation area is a conical mud hopper, which is set at 75 to 89 degrees to the horizontal, and a mud discharge pipe 2 is arranged inside the mud hopper, and the mud discharge pipe is arranged around, and the mud discharge position is on the upper part of the mud hopper. Way. A return pipe 6 is set at the center of the mud bucket, and the distance between the sludge pipe and the bottom of the pool is between 200 mm and 1000 mm.

Working process: activated sludge and sewage enter the sedimentation tank body from the water inlet pipe 1, and enter the sedimentation area 3 radially from the bell mouth of the water inlet area 7 in Figure 2, and the slope of the activated sludge in the sedimentation area 3 Under the action of the plate, the activated sludge sinks when the flow rate slows down. Since the bottom of the sedimentation area is at an angle of 60-75 degrees to the horizontal, the sludge slides down to the sludge accumulation area 4, and the sludge accumulation area passes through the surrounding pipes. Utilize mud discharge pipeline 2 to get rid of under the dynamic power. The sludge returns to the activated sludge process unit through the air lift through the return pipeline 6 . Sewage after mud-water separation passes through the outlet weir 5 and enters the next processing flow unit.

The air lifting power of the utility model can come from the wind pipe or the air compressor of blast aeration. The required gas volume is determined according to the amount of sewage to be treated, and the required gas lift depth can be adjusted according to operational needs.

Claims (4)

1. activated sludge settling tank, comprise sedimentation basin pond body, inhalant region, exhalant region, mud discharging mouth, settling zone, mud accumulation area, it is characterized in that: described settling zone and exhalant region are divided into two ends, be " L " type and arrange, the settling zone is provided with one and is the swash plates of 60～70 degree with horizontal direction, and settling zone and level are 60～75 degree settings, the settling zone links to each other with the bucket of mud accumulation area, inhalant region and bucket are arranged off-centre, and inhalant region is provided with horn mouth, and exhalant region has effluent weir and outlet conduit.

2. activated sludge settling tank according to claim 1 is characterized in that: described effluent weir is the profile of tooth effluent weir, and baffle plate is set on the effluent weir.

3. activated sludge settling tank according to claim 1 is characterized in that: the bucket of described mud accumulation area is the taper bucket, and bucket and level are 75～89 degree and are provided with, and are furnished with the spoil disposal pipeline all around in the bucket, and the spoil disposal position is on bucket top.

4. activated sludge settling tank according to claim 1 is characterized in that: described mud accumulation area bucket center is provided with reflux line, reflux line apart from the pond at the bottom of the distance between 200mm～1000mm.

Images