2. 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 Flocculation. V W P G G = velocity gradient, sec-1 W = power imparted per unit volume of basin, N-m/s-m3 P = power imparted, N-m/s It is the logical step following coagulation. The coagulation and flocculation process requires a great amount of attention to detail along the way. The theoretical mean hydraulic detention time of the tank will be 1 minute. However, water currents also tend to distribute the floc unevenly throughout the tank; as a result, it does not settle out at an even rate. Flocculation … Since water treatment is a very sensitive and important process it requires the presence of both physical and chemical processes. tank. Exit to the sedimentation tank entrance channel Design Considerations •The length of the flocculator channels matches the length of the sedimentation tank •Width of the flocculation channel? Coagulation in Water Treatment Salts of Al(III) and Fe(III) are commonly used as coagulants in water and wastewater treatment. Consider the following in your design: 1. Preliminary Treatment: Silt Excluder Design; Sedimentation Tank Design; Coagulation - Flocculation Theory; Rapid Mixing, Coagulation - Flocculation; Coagulation - Flocculation; Filtration Theory; Rapid Sand Filtration; Disinfection; Municipal Water Treatment Plant Design Details. Material for this article was largely taken from reference 1. This method has a preference in the primary purification processes mainly due to the ease The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The difference is mainly in the overflow rate (v 0) .The following table gives the design criteria of these two types. That is why Premium is specific for flocculation. Coagulation Removal of TSS by coagulation Removal of TSS, (total suspended solids) from waste water. efficiency of coagulation and flocculation process along with chemical sequestration in the removal of organic and inorganic pollutants from automotive industry sewage. RAPID MIXING DESIGN Design parameters for rapid-mix units are mixing time t and velocity gradient G. The velocity gradient is a measure of the relative velocity of two particles of fluid and the distance between. 1.2.1. This article provides an overview of the processes and looks at the latest thinking. The aim of coagulation is to destabilise a colloidal solution, so that polluting matter can bunch together to form floccules. Use the Flocculation and Sedimentation Protocol in your design. View 3 Coag+Flocc 1.pdf from CIVE 4407 at Carleton University. s ft. = 40 2 10 100 s ft. ft. 7.48 P gallons gallon P =0.427lbf s = 0.58 watts 1.355818 =0.427 P lbf watts s lbf s CIVL 1112 Water Treatment - Coagulation and Flocculation 6/7 Coagulation and Flocculation Cost NCF 4.8 or 5 units Project 1 – Treatment Cost The total yearly cost of the coagulation and flocculation system for 20 MGD is: $25,000 5 CF year Cost 7 9.462×10-5 kg 2 10 gal 365 days $0.25 gal day year kg Coagulation and Flocculation Cost $297,691 Project 1 – Treatment Cost Sedimentation System Cost The rapid mixing and flocculation tank together bring about aggregation and comprises the coagulation process. 544 9 Coagulation and Flocculation the coagulation and flocculation processes. Academia.edu is a platform for academics to share research papers. Homework #6. Key Difference – Coagulation vs Flocculation in Water Treatment Water treatment is an important aspect which involves many different steps. - Two baffles were chosen … Coagulation and flocculation are an essential part of drinking water treatment as well as wastewater treatment. When coagulants are added, the stabilised colloidal system of water is disturbed and the coagulant forms primary flocculation particles. Typical detention time is 1 hour. Destabilization of colloids by addition of chemicals. You should have at least 4 different samples that can range in dose from 0 mL to 5 mL of alum solution. By the use of coagulation and flocculation these ions can be precipitated and settled in a sedimentation tank or … Non-settleable particles in water are removed by the use of coagulating chemicals. View Design of Coagulation Rapid Mixing System(1).pdf from AA 1Design of Coagulation & Flocculation Processes Rapid Mixing System Draft Lecture Notes Contents Prelim. - The length of the tank was chosen as 1 m and the corresponding depth to provide a volume of 5.70 m3 was determined to be 3.00 m. The depth was checked to be between 1.1-1.6 times the width of the tank, as per normal design standards. Some of the water current problems can be reduced by the proper design of the tank… •The mixture is slowly stirred to induce particles to clump together into “flocs.” •The water is then moved into a quiet sedimentation basin to settle out the Determine the following: Coagulation / flocculation is a widely-used process in the primary purification of water and in industrial wastewater treatment. When a salt of Al(III) and Fe(III) is added to water, it dissociates to yield trivalent ions, which hydrate to form aquometal complexes Al(H 2 O) 6 3+ and Fe(H 2 O) 6 3+ . Flocculation Compute the power requirements for a 100 gallon tank mixing water at a velocity gradient of 40 fps/ft: 2 3 5 2 ft. lb. Flocculation Removal of TSS by flocculation Agglomeration of destabilised particles to a large size particles known as flocs , can be effectively removed by sedimentation or flotation. An operator cannot just set a dose and “hope” everything works out. This design is aimed to prevent the fluid coming out from one blade to immediately meet the second blade. first process in drinking water treatment, coagulation, is to destabilize the particles and allow them the potential to collide and stick together. There are four main mechanisms for coagulation: double layer compression, adsorption and charge neutralization, sweep flocculation, and inter-particle bridging. A jar test simulates the coagulation and flocculation processes Fill the jars with raw water sample (500 or 1000 mL) – usually 6 jars Adjust pH of the jars while mixing using H 2 SO 4 or NaOH/lime (pH: 5.0; 5.5; 6.0; 6.5; 7.0; 7.5) Add same dose of the selected coagulant (alum or iron) to each jar The results confi rmed that the method used to design certain parameters of the tank are fairly accurate. Optimum retention time in pilot unit is equal to 2.5 h compared to 3.5 h for conventional chemical treatment. A common use of coagulation and flocculation for wastewater treatment is in the galvanic industry. Flocculation is the step where destabilized colloidal particles (or the particles formed during the coagulation step) are assembled into aggregates. Coagulation and flocculation are often used in combination. Materials & Methods: This study is an applied-experimental study. 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