The working principle of radial sedimentation tank, the advantages and disadvantages of radial sedim

The ideal supporting equipment for the sedimentation tank in the process of radial flow sedimentation tank, semi-bridge peripheral transmission, sludge scraping, activated sludge treatment, sewage treatment, is suitable for primary sedimentation tank or secondary sedimentation tank, and its main function is to remove the sedimented sludge in the sedimentation tank and the floating matter on the surface of the water surface. Generally, it is suitable for large and medium pond diameter sedimentation tanks. Peripheral transmission, large transmission torque, and relatively energy-saving; The central bearing is connected with the rotating truss in the form of hinging, and the torque generated when scraping mud acts on the central bearing, it is converted into the circumferential friction force of the central rotating bearing, so the stress condition is better; The water inlet and sludge discharge in the center and the water outlet around the periphery have little agitation force on the water body, which is conducive to the removal of sludge.

Radial sedimentation tank is a kind of circular, large diameter and effective water depth is correspondingly shallow pool, the diameter of the pool is generally more than 20-30, and the depth of the pool is in the center of the pool and the periphery of the pool. The ratio of pool diameter to pool height is 4-6Sewage generally enters through the central pipe of the pool, and the sewage flows to the periphery of the pool along the radiation direction under the action of the perforated baffle, and the hydraulic characteristics are that the water flow speed changes from large to small.

Due to the long circumference of the pool, the outlet weir of the outlet is not easy to control at a consistent level, and the zigzag triangular weir is usually used to outflow as much as possible to make the outlet water even.

The circular large-scale radial flow sedimentation tank often uses mechanical sludge scraping to scrape the sludge to the mud bucket of the pool, and then discharges the sludge by gravity or mud pump. When the diameter of the pond is less than 20m, the square multi-bucket sludge discharge can be considered, the sludge slides into the bucket by itself, and the sludge is discharged with hydrostatic pressure, and each bucket is provided with an independent sludge discharge pipe.

Vertical flow sedimentation tank:

The advantage is that it occupies a small area and is easy to discharge the sludge.

The disadvantages are large depth, difficult construction and high cost. It is often used in water treatment plants with a water treatment volume of less than 20,000 m3 d.

Radial sedimentation tank:

Advantages: the use of mechanical sludge discharge, good operation, simple equipment, sludge discharge equipment has stereotyped products, good precipitation effect, large daily treatment capacity, small agitation of the water body, conducive to the removal of suspended solids.

Disadvantages: unstable water volume, complex design, high construction requirements, large floor area, suitable for large water plants.

Sewage enters the sedimentation tank from the center or periphery. The inlet pipe of the central inlet radial flow sedimentation tank is suspended under the bridge frame or buried in the concrete of the bottom plate of the pool body, and the sewage first enters the central pipe of the pool body, and then when entering the closed sedimentation tank, it evenly radiates and flows to the surroundings after the rectifier plate around the central paiye pipe, and the supernatant overflows through the dust state that is located around the sedimentation tank, and the sludge settles to the bottom of the pool, and is scraped to the mud collection bucket in the center of the sedimentation tank by the scraper or the scraping suction machine, and then is discharged by gravity or pump suction. The inlet channel of the surrounding inlet radial sedimentation tank is arranged around the sedimentation tank, and the supernatant overflows through the outlet weir located around or in the middle of the sedimentation tank, and the sludge discharge mode is the same as that of the central inlet radial sedimentation tank.

Centripetal radial sedimentation tank is a common sewage treatment equipment, which separates impurities and wastes in sewage by using centripetal force and gravity. In general, it works as follows:1

Sewage enters the pool: Sewage first enters from the ** of the pool. A high-speed spinning centrifuge separates the wastewater into many tiny droplets and particles.

2.Gravitational separation: Due to the greater density of water droplets and particles, they are deposited towards the bottom of the pool by gravity.

Water droplets and particles form a sludge that accumulates at the bottom of the pond and the sediment gets thicker and thicker over time. Extinction 3Mixed Pools:

In a centripetal radial sedimentation tank, the effluent enters the bottom of the tank and moves outward, mixing with the waste and flowing into the mixing tank. The water in the mixing tank is further purified to reduce indicators such as chemical oxygen demand (COD) and biochemical oxygen demand (BOD) to meet environmental requirements. 4.

Discharge: Clean water is discharged from the upper part after being filtered and treated several times. Waste and sludge can be removed from the bottom of the pond by equipment such as a scraper and then treated or disposed of.

In short, the centripetal radial flow sedimentation tank is a kind of sewage treatment equipment, which uses centrifugal force and gravity to separate impurities and wastes in sewage, so as to achieve the purpose of purifying sewage.

Hello, Xiaohai, a home expert, is happy to answer for you. Pro, the design code and principle of radial sedimentation tankThe ratio of the diameter of the pool (or one side of the square) to the effective water depth should be 6 12, the effective water depth should be 2 4m, and the diameter of the pool should not be greater than 50m. For urban sewage plants, the number of sedimentation tanks should not be less than 2.

Effluent weir load, primary sedimentation tank; Second Sedimentation Tank:. The rotation speed of the sludge discharge machinery should be 1 3r h, and the linear speed of the outer edge of the scraper is not more than 3m min. The height of the buffer layer should be for non-mechanical sludge discharge; When mechanical mud discharge, it should be determined according to the height of the scraper, and the upper edge of the buffer layer should be at a high place scraper.

The slope of the bottom slope of the slope mud bucket should not be less than; The inclination angle of the inclined wall of the mud storage bucket, the square bucket should not be less than 60o, and the round bucket should not be less than 55o; The volume of the sludge hopper is generally calculated by the amount of sludge not more than 2 days. For the secondary sedimentation tank, the sludge storage time is not more than 2 hours. Generally, it is hydrostatic pressure sludge discharge, and the diameter of the sludge discharge pipe is not less than 200mm.

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Summary. Radial secondary sedimentation tank is a kind of wastewater treatment facility, its main function is to remove solid particles and suspended solids in wastewater, and then improve the water quality of wastewater. The removal rate of radial secondary sedimentation tanks is mainly affected by the following factors:

Cake concentration: The higher the cake concentration, the higher the treatment efficiency at the same flow rate. Hydraulic load:

Excessive water velocity and excessive amount of water passing through the secondary sedimentation tank may cause wastewater to flow through the secondary sedimentation facility, affecting the removal rate. Appropriately reducing the water flow rate and the traction of the water treatment flow rate of the facility can effectively improve the removal rate. Pipe partition settings:

The perturbation plates, when properly set, help to enhance the mixing between the water and the mud cake, resulting in a higher removal rate.

Radial secondary sedimentation tank is a kind of wastewater treatment equipment, its main function is to remove solid particles and suspended solids in wastewater, and then improve the water quality of wastewater. The removal rate of the radial secondary sedimentation tank is mainly affected by the following factors: mud cake concentration:

The higher the concentration of the mud cake, the higher the treatment efficiency at the same flow rate. Hydraulic load: Excessive water flow velocity and excessive amount of water passing through the secondary sedimentation tank may cause wastewater to flow through the secondary sedimentation facility, affecting the removal rate of lead removal from the secondary sedimentation facility.

Appropriately reducing the water flow rate and the traction of the water treatment flow rate of the facility can effectively improve the removal rate. Pipe Partition Setting: Properly set up the disturbance plate to help enhance the mixing between the water and the mud cake, achieving the effect of increasing the removal rate.

Can you add, I don't quite understand it.

Type and dosage of coagulant: The type of coagulant is different, and the dosage will also affect the removal rate, and they all need to be adjusted appropriately. External factors: temperature, air pressure, wind, ** and other external factors will also have a certain degree of influence on the removal rate.

There are weeks in and out, and there are also in and out.

The commonly used types of sedimentation tanks are: advection sedimentation tanks. Vertical flow sedimentation tank, radial flow sedimentation tank.

The advantage of inclined plate and inclined tube sedimentation tank is that the hydraulic load is high, which is more than double that of other sedimentation tanks, occupies less land and saves the investment of civil engineering, and the disadvantage is that the inclined plate and inclined pipe are easy to block.

The advantages of radial flow sedimentation tank are that multi-use mechanical sludge discharge, good operation, simple management, sludge discharge equipment has tended to be finalized, and the disadvantage is that the mechanical sludge discharge equipment is complex and has high requirements for construction quality;

The advantage of advection sedimentation tank is that the sedimentation effect is good, the adaptability to impact load and temperature change is strong, the adaptability to impact load and temperature change is strong, the construction is easy, the cost is low, the disadvantage is that the pool water distribution is not easy to be uniform, when using multi-bucket mud discharge, each mud bucket needs to be separately designed to discharge mud pipes to discharge mud, and the operation volume is large, and when using chain belt type scraping mud discharge, the supporting parts and driving parts are immersed in water, and are easy to corrode;

Advection sedimentation tanks are rectangular in shape, and wastewater flows in from one end of the tank, flows through the tank in the direction of degree, and flows out from the other end of the tank. At the bottom of the inlet of the pool, a mud storage bucket is arranged, and the bottom of the pool has a slope in other parts, which tends to the mud storage bucket.

Radial sedimentation tanks are mostly circular in shape, and small tanks are sometimes square or polygonal. The inlet of the pool is in **, and the outlet is in the surrounding area. The water flow in the pool is in the direction of the degree to the surrounding radiation, the mud bucket is located in the pool**, the bottom of the pool is inclined to the center, and the sludge is usually swept away by scraping (or suction) machinery.

The vertical flow sedimentation tank, also known as the vertical sedimentation tank, is a sedimentation tank in which the boiling water moves vertically. The plane figure of the pool body is circular or square, and the water enters the pool from top to bottom by the inlet pipe located in the center of the pool (the flow rate in the pipe should be less than 30mm s), and the umbrella-shaped baffle is set under the pipe to make the wastewater evenly distributed in the pool and rise slowly along the entire water section (about domestic sewage, the sedimentation time is adopted, the suspended solids settle into the conical sedimentation bucket at the bottom of the pool, and the clear water flows out from the pool around the overflow weir along the perimeter. A baffle plate and a scum tank are set up in front of the weir to intercept the scum to ensure the quality of the effluent.