Coagulation comes from the latin word coagulare which means to agglomerate. There are four main mechanisms for coagulation.
Schematic The Coagulation And Flocculation Process Download Scientific Diagram
Tank Volume gal 44880 gal.
. These colloids result in a stable suspension. Flocculation is a water treatment process following coagulation which uses gentle stirring to bring the suspended particles together so they will form larger more settleable clumps called floc. Overview of coagulation and flocculation 1 11.
V Qt Where V tank volume m3 Q desdes gign flow m3S t detention time in the tank S The detention time in the flocculation tank is much higher than that in the rapid mixer. Design a horizontal flow baffled channel flocculatorfor a treatment plant of 10000m 3day capacity. Flocculation Discrete Type 1 settling is discussed above is relatively rare in water and especially wastewater treatment.
Coagulation Flocculation Sedimentation 1. Its design was developed to better control the flow during the flocculation stage. 2 Devices ¾Agitation in rapid mixing and flocculation is performed by.
First process in drinking water treatment coagulation is to destabilize the particles and allow them the potential to collide and stick together. Basic principle of coagulation. Coagulation and Flocculation Process Fundamentals 1 Coagulation and Flocculation.
The design flow for a water treatment plant WTP is 1 MGD 38x103 m3d. Tank Volume gal 50 ft x 12 ft x 10 ft x 748 galft 3. Coagulant added into fully mixed tanks with short retention time and high turbulence mixing.
FMany of the contaminants in water contain matter in the colloidal form. The flocculation basin is to be divided into 3 sections of equal volume each section having constant velocity gradients of 50 35 25 s-1 respectively. The simplest method of using lime is in the form of a suspension led into a special tank called a lime saturator to produce a saturated solution of calcium hydroxide.
Coagulation is the step where colloidal par ticles similar t o spheres of a diameter of less than 1 micrometer are destabilized. The flow to a flocculation basin 50 feet long 12 feet wide and 10 feet deep is 2100 gpm. Depth of the tank 3 to 45m.
Coagulation Chemical treatment typically is applied prior to sedimentation and filtration to enhance the ability of a treatment process to remove particles. As a particle falls it collides with other particle and they stick together to form larger particles. In flocculation one can make a distinction between perikinetic and.
Shape of the tank Circular or rectangular. Double layer compression adsorption and charge neutralization sweep flocculation and inter-particle bridging. 25 September 2007 8 Rhine.
Also chemicals and polymers are added to enhance coagulation and flocculation. Consider the following in your design. Coagulation is a process to neutralize charges and then to.
The process of agglomeration of the destabilized particles to such a size that separation by sedimentation and filtration is possible. The suspended particles vary considerably in source composition charge particle size. The total flocculation time is to be 21 min and the water temperature is 15 C.
It enables a significant decrease in footprint of the process. Suspended particles vary in source charge particle size shape and density. In treatment many particles are present.
Sweep flocculation is the primary. Construction forms of flocculation tanks. Coagulation and flocculation are used to separate the suspended solids portion from the water.
The Turbomix is a special design of mixing tank. It is in the range of. Tank Volume gal Length ft x Width ft x Depth ft x 748 galft 3.
You should have at least 4 different samples that can range in dose from 0 mL to 5 mL of alum solution. Operation once the design is implemented in steel and concrete. Groundwater and surface water contain both dissolved and suspended particles.
Detention times for flocculation 20 to 60 minutes. The size of the tank depends on the required lime dosage. View Design of Coagulation Rapid Mixing System1pdf from AA 1Design of Coagulation Flocculation Processes Rapid Mixing System Draft Lecture.
What is the detention time in the tank in minutes. Use the Flocculation and Sedimentation Protocol in your design. Vary to optimize flocculation efficiency function of geometry Need to determine Head loss Residence time Baffle spacing Number of baffles Human width More Design Considerations Even number of channels for AguaClara design to keep chemical dose controller near stock tanks but this may change if.
Allowing polluting matter to form floccules. 544 9 Coagulation and Flocculation the coagulation and flocculation processes. After coagulation the destabilized particles can collide aggregate so flocs can be formed.
143 Coagulation and flocculation with extracts of particular seeds. FlotLife delivers equipment and services for complete wastewater coagulation and flocculation processes. Coagulation and flocculation processes are used to separate the suspended solids portion from the water.
Design criteria for Mechanical flocculator are furnished below. The theoretical mean hydraulic detention time of the tank will be 1 minute. Flocculation is considered more gentle mixing process.
Mechanical agitators most common Pneumatic agitators Baffled basins Design ¾The degree of mixing is based on the power provided which is measured by the velocity gradient. The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mgL. Coagulation 200 Operational Considerations Flocculation requires careful attention to the mixing velocity and amount of mix energy.
Detention Time min 214 min. After coagulation and flocculation removal of floc aggregates by sedimentation andor filtration. 25 September 2007 46 Plug flow Completely mixed no mixing thus particle.
Two steps typically are employed. Total area of paddles 10 to 25 of the vertical cross-sectional area of the tank. Coagulation neutralizes repelling colloidal solution.
Coagulants can be chitosan natural poly-aluminium chloride aluminium sulfate. G velocity gradient sec-1 W power imparted per unit volume of basin N-ms-m3 P power imparted N-ms. Specific topics include 1 the role of coagulation and flocculation processes in water treatment 2 sta-bility of particles in water 3 coagulation theory 4 coagulation practice 5 coagulation of dissolved and organic constituents 6 flocculation.
Technology of wastewater coagulation and flocculation include combination of a tank- or pipe-shaped reactor flocculator and pumpsvalves to ensure very precise dosage of chemical reagents. Design contact times for flocculation range from 15 or 20 minutes to an hour or more. Design a procedure to determine the proper flocculant dose.
Once the floc has reached it optimum size and strength the water is ready for the sedimentation process. Design of Flocculation tanks. This step is called flocculation.
