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In large waste water treatment plants, the flocculator and the clarifier are combined together to achieve economy in construction. The combined unit of flocculator and clarifier is known as clariflocculator in waste water treatment process.
Clariflocculator shall have two concentric tanks with inner tank serving as flocculation basin and outer tank serving as clarifier. Clariflocculator in Both Empty and Full Condition. Plate and Tube Settlers have been developed as an alternative to shallow basins and are used in conjunction with both existing and specially designed sedimentation basins. Plate and Tube Settlers are shallow settling devices consisting of stacked offset trays or bundles of small plastic tubes of various geometries.
They are used to enhance the settling characteristics of sedimentation basins. The shape, hydraulic radii, angle of inclination, and length of the plate and tube settlers will vary according to the particular installation.
Normal practice is to insert the plate or tube settlers in sedimentation basins either rectangular or circular of sufficient depth. The flow within the basin passes upward through the plate or tube modules and exits from the basin above the modules.
The solids that settle out within the plates or tubes move by means of gravity counter currently downward and out of the tube modules to the basin bottom. The need for flushing poses a problem with the use of plate and tube settlers where the characteristics of the solids to be removed vary from day to day. Clarifier up flow is passed through these tubes. Settling within these tubes and contact clarification of fine floc results in a build-up of particles on the tube surfaces.
Particles combine to form agglomerates which become heavy enough to slough against the upward flow and slide down the tube slope to join the sludge blanket below. Tubes are supplied in module form — each being 1 meter wide by 1 meter long by 0. The modules are arranged on a supporting framework to form a layer within the clarifier.
The tube settlers are suspended at a height mm below the top water level. The above figure shows the supporting framework, module installation and settler positioning at Inlet clarifier in waste water treatment. This was done to minimize the installation time.
The entire installation may be completed in three days in an existing Water Treatment Plant, the clear water storage was filled to capacity prior to installation of the tube settlers to allow for the three days the plant was off line. High rate tube settlers are designed to improve the characteristics of the rectangular basin and to increase flow through the tank. The tube settlers consist of a series of tubes that are installed at a angle to the surface of the tank.
The flow is directed up through the settlers. Particles have a tendency to flow at an angle different than the water and to contact the tube at some point before reaching the top of the tube. After particles have been removed from the flow and collected on the tubes, they tend to slide down the tube and back into the sludge zone. Arrangements of Tube Settlers in Rectangular Tank. Tube settlers and lamella plates are very useful in plants where site area is limited, in packaged plants, or to increase the capacity of the existing shallow basins.
After coagulation and or flocculation in the sludge blanket units, the incoming water passes through the suspended layer of previously formed floc. Because the center-well in these units is often shaped like an inverted cone, the rise rate of the water decreases as it rises through the steadily enlarging cross section.
Sludge blanket efficiency depends on the filtering action as the freshly coagulated or flocculated water passes through the suspended floc. Higher sludge levels increase the filtration efficiency. In practice, the top sludge interface is carried at the highest safe level to prevent upsets that might result in large amounts of floc carryover into the overflow.
Excessive sludge withdrawal or blow down should also be avoided. The sludge blanket level is often highly sensitive to changes in throughput, coagulant addition, and changes in raw water chemistry and temperature. The Inlet zone, 2. The Settling Types Of Sedimentation Basin The common types of sedimentation basins are rectangular basins, square Flocculation Basin Flocculation is the operation in which the coagulated water must Sludge Disposal The sludge which is found in the bottom of a I really like when people are expressing their opinion and thought.
So I like the way you are writing. One of the us specialize in implementing projects of technical infrastructure such as water supply, drainage and wastewater treatment. Vietnamese market is very potential system because wastewater treatment is very lacking. Now that the Vietnamese government is very interested in this development environment, especially environmental waste water.
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The selection and application of technology in the world are also companies in the country to apply. And we are ready to cooperate with your company to market development in Viet Nam. The advantage of us can make are: technology specialists, the ability to advantageous relations at the local level, understand the procedure and approach the project. I think that with the strength of technology your company along with the convenient availability of us, we will have high quality products exclusive rights in Vietnam.
If your company are interested in this, I hope the cooperation between PVME and your company successful. Hello Mr. Nguyen Manh Hao. First i would like to say thanks for this wonderful article but i need a full design criteria of the pulsator clarifier.. Wow, superb blog content! How long have you been blogging for? The overall your site is wonderful. I like your way to explain the think. Could u please tell me the design torque calculation for Clariflocculator. Plz tell me the Loading Factor Also,.
As someone who has recently started training in water treatment, I am still new to a lot of this The Clariflocculator post will no doubt be helpful in this semester. Iam pHD student Imade poilot of pulsator my poilot worked. Name required. Mail will not be published required. Posted by Water Treatment in Sewage Treatment 20 responses. Clarifier with Tube. Clarifier with Plate Settler. Up flow Sludge Blanket Clarifier. Schematic of Pulsator Clarifier. March 10, at pm. March 13, at pm.
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