Velocity of flow = 0.2 to 0.8 m/s (0.4 m/s) 4. Design criteria for flocculator 1. 14.3 Coagulation and flocculation with extracts of particular seeds In case of tapered flocculation, which is often a preferred option in efficient and energy-saving flocculation process, G values can be set as follows: 100 sec-1 in 1st tank. Editor. Stephen J. Randtke, Ph.D., P.E. The design program from horizontal flow is integrated into the same program used to design vertical flow flocculators and an algorithm is used to select between the two designs. Design Criteria mixertipspeed = πDN 21:04/27/2/2007 1/3 Design Clarifier Tank(Solid Contact)/Design Criteria 3.1. Slow forming flocs require a large flocculation tank to provide adequate detention time. 3. Velocity gradient G = 10 to 75 s-1 7. 3 If a particle settles with vertical speed v, its vertical fall over the length of the tank is u L h v v This length h is either longer than the settling depth H or it is not. Therefore, with reference to the design criteria (minimizing footprint or minimizing settled water turbidity); an optimal BM can be selected for a given application. In Softening treatment plants treating hard water to removes flocculated solids. Design data and information for trickling filter processes. Surface loading rates for primary settling tanks. Total area of paddles = 10 to 25 % of c/s area 5. Important process design criteria appear to be that shear should be sufficient to ensure adequate mixing but limited to avoid excessive floc breakage. In the scheme of the whole plant, the flocculation tank is drawn after the sedimentation tank (so many of our variables are constrained by an already-drawn sedimentation tank). 12-2. Criteria are provided in the EPA Manual 625/1-74-006. Flocculation Design Equations Calculator Wastewater Water Treatment Systems Formulas. If h ≥H, then the particle hits the bottom before the end of the tank and is collected. G.E. What is Dissolved Air Flotation Definition - DAF Unit Dissolved air flotation (DAF) technology is very suitable for removal of floating particulate foulants such as algal cells, oil, grease or other contaminants that cannot be effectively removed by sedimentation or filtration. Solving For Power Input. 1/10/2017 CEE 4540: Sustainable Municipal Drinking Water Treatment Monroe Weber-Shirk 4 The design inputs for flocculation •We need collisions and thus G is a logical design specification •We need to specify energy use •Velocity gradient ‐ )̅ •Energy dissipation rate ‐ Ý̅ •Total head loss ‐ r Clarifier design overflow rates. 11-3. The design criteria for coagutation and flocculation tank is presented in Table Q1a and Table Q1b. A town of Indah Valley has requested proposals for a new water treatment plant to cater water demand of 13 405 m /day. Velocity of flow: i) From rapid mixing unit to flocculator ii) Through flocculation basin iii) From flocculation basin to settling tank through pipe or channel (to prevent settling or breaking of flocs) 0.45 0.9 m/s 0.2 0.8 m/s 0.15 0.25 m/s Step 1 Design of Influent Pipe Assume velocity of flow through pipe and use continuity eqn. Coagulation and Flocculation Cost $297,691 Project 1 – Treatment Cost Sedimentation System Cost Step 1 - Compute the prototype sediment tank retention time tp. American Water Works Association American Society of Civil Engineers. 50 -60 sec-1 in 2nd tank. Water Works . flocculation is to be designed with two parallel trains and each train is to be made of five compartments in series. Valentine, Jr. Environmental Treatment Systems, Inc. P.O. 10-2. Flocculation and Dissolved Air Flotation Sean Bowen, Aleah Henry . Finally, the ballast media point of zero charge and shape were not identified as key criteria for ballasted flocculation. For certain applications, lighter ballast media may be more economical because they offer more available surface area for a given mass concentration, hence reducing the amount of ballast media required in the flocculation tank. 15:27/25/10/2006 2/2 Design Clarifier Tank/Design Criteria. The concentration of BM inside the flocculation tank (typically referred to as the maturation tank) is very high, in the range of 4–10 g silica sand (SS)/L for industrial applications. Design criteria for paddle wheel flocculator Horizontal shaft paddle wheel flocculators are to be used for flocculation in a water treatment plant with a design flow rate of 130 ML/d. These criteria directly influence the design and construction of sedimentation. The failures in coagulation plant are due to incorrect does of the coagulant, inadequate mixing arrangements, improper tank design, etc. The processes of coagulation and flocculation are greatly influenced by the physical characteristics of water, its dissolved constituents and the temperature. 4 1.56 gallons mL L gallon 1,000 minute 1000ml 3.785L tp 3 tank 3 gallon Volume 360 in. The speed of formation of the floc is reflected in the flocculation chamber design. The design flow for a water treatment plant (WTP) is 1 MGD (3.8x103 m3/d).The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The sedimentation tank comes after the flocculation tank. The baffles in the flocculation tanks will be made of 1.5 inch thick ferro cement slabs and these baffles will not be removable. The treatment process will be similar to that used in the pilot plant. Coagulation, Flocculation, Sedimentation 1. Final design on the initial construction program began in February 1971 and was concluded in April 1973. 11-1. Recommended . The cost of coagulant and size of the plant are important factors to be considered in the design of a clariflocculator; Coagulation and flocculation play a very important role in any water treatment plant. It is common industrial practice to add polymeric flocculants directly into slurry streams during 11-2. Various chemical feed arrangements can be used. Flocculation tank design factors. RETHINKING DISSOLVED AIR FLOTATION (DAF) DESIGN FOR INDUSTRIAL PRETREATMENT Charles C. Ross, P.E. 4. When coagulants are added, the stabilised colloidal system of water is disturbed and the coagulant forms primary flocculation particles. 1 CEE 371 Fall 2009 Homework #6. 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