What is tube settler?
-lamella clarifier sedimentation principle
(1) The Basic Overview
The inclined plate (tube) sedimentation tank is an efficient combination sedimentation tank designed according to the shallow pool sedimentation theory. Also known as shallow pond sedimentation tank. Many dense inclined pipes or inclined plates are arranged in the settling area, so that the suspended impurities in the water are settled in the inclined plates or inclined pipes, the water rises and flows along the inclined plates or inclined pipes, and the separated sludge slides down to the bottom of the pool along with the inclined plates (pipes) under the action of gravity. And concentrated discharge. This kind of pond can improve the precipitation efficiency by 50~60%.
The treatment capacity can be improved by 3~5 times in the same area. According to the test data of the original wastewater, the inclined tube settler with different flow rates can be designed, and coagulant is usually added when it is used. Inclined-tube precipitation water purification method is to set up an inclined tube with an installation angle of 60 degrees above the sludge suspension layer, so as to remove suspended solids, solids or frame alum formed after adding coagulant in raw water. The surface area on the bottom side of the inclined pipe accumulates into a thin mud layer, which slides back to the sludge suspension layer by gravity, and then sinks into the mud collecting hopper. It is discharged into the sludge pond by the sludge discharge pipe for further treatment or comprehensive utilization. The supernatant gradually rises to the water collecting pipe for discharge, and can be directly discharged or reused.
(2) Characteristics of Equipment
1. Simple structure, no wearing parts, durability and less maintenance.
2. Stable operation and easy operation.
3. Less power and energy saving.
4. Save land, less investment, quick launch and high efficiency.
5. Short stay time, high precipitation effect, high treatment efficiency, low aeration intensity, and land saving, without sludge backflow.
(3) Scope of Use
I. the removal rate of mixed wastewater containing various metal ions, Ming, copper, iron, zinc and nickel in electroplating wastewater is 90% per person;
Generally, electroplating wastewater can reach the discharge standard after being treated.
II. Coal mine and mineral processing wastewater can raise turbidity from 500-1500mg/l to 5mg/L
III. The chroma removal rate of printing and dyeing wastewater is 70-90%, and COD removal is 50-70%.
IV. Removal of a large amount of organic matter from wastewater from tannery, food and other industries, with COD removal rate of 50-80% and impurity solid removal rate of over 90%. COD removal rate of chemical wastewater is 60-70%, chroma removal is 60-90%, and suspended matter reaches the discharge standard.
(4) The Structure Introduction
Materials of inclined tube and inclined plate: FRP, PVC, PE and PP.
The inclined tube section is generally regular hexagon, and the inclined plate section can be parallel plate or sinusoidal plate.
The height of clear water area above the top of inclined pipe (plate) is 1.0—1.5m, and the height of water distribution area below the bottom is not less than 1.0—1.5m When discharging mud mechanically, the height of water distribution area should be greater than 1.6m, which is convenient for installation and maintenance.
The Re number of the water flow in the inclined pipe (plate) is less than 500 and the fr number is 10-3-10-5.
The designed flow velocity of inclined tube is 1.0-4.0mm/s, and that of inclined plate is 10-20 mm/s.
(5) Installation and Use
1. When installing inclined tube, glue solution or electric bonding shall be used for bonding and fixing. Parallel inclined plate is fixed with support frame, and corrugated inclined plate is fixed with through-center screw.
2. During installation, the inclined direction should not make the water flow straight at the inclined pipe (plate).
3. Regular washing and reasonable management can reduce the blockage caused by the rapid growth of biofilm.
4. Inclined tube (plate) plane shall not bear concentrated load.
5. Open flames shall not be used in areas where inclined pipes (plates) are installed.
(6) Precipitation principle
Inclined plate and inclined tube are collectively called shallow pool sedimentation tank, which is based on the principle of shallow pool sedimentation. There is an ideal sedimentation tank with pit v, surface area a, long length, width =B, height = mouth, treated water quantity q, residence time t and sedimentation speed U0. Then v=Qt, H=Uot, Q=Uot/H=UOA. According to the sedimentation principle of shallow pond, the sedimentation efficiency is only the area of the sedimentation tank surface area, and has nothing to do with the water depth.When the volume of sedimentation tank is a fixed value, the shallower the tank, the greater the A value and the higher the sedimentation efficiency. Therefore, if the sedimentation tank is divided into n layers according to height, that is, into n shallow sedimentation units with height h=H/n, and the sedimentation depth of particles decreases from each other to H/n under the condition of constant q, the sedimentation velocity range of particles that can be completely removed in the sedimentation tank will be expanded from the original UO to the mouth uUo/n,The fraction of particles that can be removed in the settling velocity uUo also increases from u/U0 to nu/UO, so that the removal rate of suspended particles in the settling tank is increased by N times compared with the original one. Obviously, the more separated shallow layers, the higher the removal rate. This principle can be made into inclined plate or inclined tube sedimentation tank.
Inclined tube sedimentation tank adopts ethylene-propylene copolymer, glass fiber reinforced plastic or polyvinyl chloride honeycomb inclined tube, with inclination of 60℃, inclined length of 1m and inscribed circle diameter of 35-50MM, which can be changed according to water quality to achieve the best sedimentation effect. The inclined tube precipitator can be designed and processed according to the user's requirements or the test data of the original wastewater. Coagulant is usually added when it is used.It is suitable for rural areas, towns, farms, army barracks, small and medium-sized enterprises and institutions to improve drinking water quality and small-scale waste/sewage projects.
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