1 Turbidity = NTU 2pH = 3 Alkalinity = mg/l as CaCO 3 4 Temperature = 5 Fe mg/l 6 Mn mg/l 7 Total Hardness mg/l as CaCO 3

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3 DESIGN CALIFIER TANK (SLUDGE BLANKET CLARIFIER TYPE : VERTICAL SLUDGE BLANKET) 1. Flow Rate Q = 150 m /hr. Raw Water Quality input 1 Turbidity = NTU ph = Alkalinity = mg/l as CaCO Temperature = 5 Fe mg/l 6 Mn mg/l 7 Total Hardness mg/l as CaCO o C 8:16 AM//8/007 1/1 Design Clarifier Tank(Skert)/Design Flow

4 . Design Criteria.1. Kawamura.1.1 Flocculation Time = approximate = 0 min.1. Settling Time = 1 - hr.1. Surface Loading = - m/hr.1. Weir Loading = m /hr.1.5 Upflow Velocity = < 10 mm/min.1.6 Slurry Circulation rate = up to - 5 time the raw water inflow rate.1.7 G = 0-50 s MAXIMUM MIXER TIP SPEE 0.9 m/s (Baffled Channel) = 0.9 m/s (Horizontal Shaft with Paddles) = m/s (Vertical Shaft with Paddles) Equation mixer tip speed = πdn.1.9 Free Board is approxim = 0.6 m.1.10 Water Depth = - 5 m Length and Width ratio = 6 : 1 (minimum : 1) (Rectangular Basin).1.1 Width and Water Depth = : 1 (maximum 6 : 1) (Rectangular Basin).1.1 Blade area/rapid Mixing Tank area = % (page 11).1.1 Blade : Diameter Blade/Diameter Mixing Tank = (page 11).1.15 Shaft rpm = Q, Sim..1 Detention Time = Hr.. Surface Loading = - m/hr.. Weir Loading = 7.1 m /m.hr.. Sheet Master Degree of Environmental Engineering..1 Weir Loading = 7.1 m /m.hr.. Surface Koading - Q < 0.5 m /min = m/hr 8:16 AM//8/007 1/ Design Clarifier Tank(Skert)/Design Criteria

5 - Q > 0.5 m /min = m/hr.. Water Depth = - 5 m... Paddle radius = 65-75% of radius for Flocculator..5 Detention Time = 1 - Hr..6 Diameter Tank < 5 m..7 Paddle at bottom tank high bottom = 15-0 cm..8 Paddle Velocity = - rpm..9 Effective Paddle Area = 10 % Sweep area of the fllocculator.. Water Work Engineering Book..1 Flocculation..1.1 Detention Time = 0-60 min..1. Velocity Gradie = S GT = 1x10-15x Periperal Velocity of Paddle = m/s..1.5 Shaft rotation speed = rpm.. Sedimetation (Coagulation)...1 Detention Time = - 8 hr... Surface Loading = 0-0 m /m.day... Weir Loading = m /m.day.. Sedimentation (Softening)...1 Detention Time = 1-6 Hr... Surface Loading = 0-60 m /m.day... Weir Loading = m /m.day.5 Clarifier Design (Water Poluttion Control Federation 1985).5.1 Detention Time Flocculator central well = 0-0 min.5. Weir Loading (outlet) = 100 to 150 m /m.day.5. Radial inner feed well = 10 to 1% of the tank radius.5. velocity gradient = 0-50 S -1 8:16 AM//8/007 / Design Clarifier Tank(Skert)/Design Criteria

6 GiveContact Time in Hopper inside (Flocculation Zone) = 0 min 5 Flow Rate = 150 m /hr 6 Volume in Hopper inside = = Q x t 75 m 7 Give Detention Time in Hopper outside (Sedimentation Zone = Hr 8 Volume in Hopper outside = Q x t = 00 m 9 Calculation Diameter Hopper inside Give D 1 = m Surface Area = πd m = m 10 Theory Volume of Conical Basin = A 1 d ( A + A + A x A ) 1 1 Give Water Depth = 5 m Volume Hopper inside = 75 m Then 5 = A = A ( ) =.971 A A =.71 m A A Theory Surface Area = πd = D D = m. Then = m. D 1 D Water Depth = 6 m. = 5 m. 8:17 AM//8/007 1/ Design Clarifier Tank(Skert)/Hopper inside&outside

7 Free Board from Design Criteria = 0.6 m (Kawamura) Solid Contact Clarifier Tank Height = 5.6 m 8:17 AM//8/007 / Design Clarifier Tank(Skert)/Hopper inside&outside

8 ZONE A D D A1 Depth ZONE Depth ZONE Depth ZONE D A 8:17 AM//8/007 / Design Clarifier Tank(Skert)/Hopper inside&outside

9 11 Actual Volume in Hopper inside Theory Volume of Conical Basin = d ( A + A + A x A ) 1 1 A 1 A πd = = m πd = = 8.7 m Calculate Acture Volume in Hopper inside Volume in Hopper inside = d ( A + A + A x A ) 1 1 = m V Q 1 Acture Contact Time = = Hr. t = 150 =.9867 min. 1 Calculate Diameter in Hopper Outside (Sedimentation Zone) Volume in Hopper Outside (Sedimentation Zone) = 00 m A πd = = 8.7 m Calculate A Theory Volume of Conical Basin = d ( A + A + A x A ) = A = A ( A ) = m A = m A A 8:17 AM//8/007 1/ Design Clarifier Tank(Skert)/Acture Volume&Contact time

10 Acture Volume in Hopper outside πd D = m = m A πd = = 8.7 m A = πd = m 1 Calculate Acture Volume in Hopper outside + Outside = d ( A + A + A x A ) Volume in Hopper outside + Outside = 8.59 m Conclusion - Volume in Hopper inside = m - Volume in Hopper outside = m 8:17 AM//8/007 / Design Clarifier Tank(Skert)/Acture Volume&Contact time

11 15 Detention Time in Hopper outside t = V Q t = Hr. 16 Calculate Paddle 16.1 At Depth level = 1.5 m. Slope =. m. Then. = 1.5 X 1 X 1 = 0.5 m. Diameter Paddle =.9 m. Sweep Area = πd = m Paddle Area = 10 % of Sweep area(bhole,a.g, Personal Communication) = m Assume There are paddle. paddles Length of each paddle = % of Radius of Flocculation selection 70 % - At depth level 1.5 m. Diameter of Flocculator =.9 m. Radius = 1.95 m. Length of each paddle = 1.65 m. Area Length x Height of each paddle = = m. 8:18 AM//8/007 1/ Design Clarifier Tank(Skert)/Detention Time&Paddle Area

12 16. At Depth level =.5 m. Slope =. m. Then. =.5 X X = 1.05 m. Diameter Paddle = 5.1 m. Sweep Area = πd = 0.81 m Paddle Area = 10 % of Sweep area(bhole,a.g, Personal Communication) =.0 m Assume There are paddle. paddles Length of each paddle = % of Radius of Flocculation selection 70 % - At depth level.5 m. Diameter of Flocculator = 5.1 m. Radius =.55 m. Length of each paddle = m. Area Length x Height of each paddle = = m. 16. At Depth level =.7 m. Slope =. m. Then. =.7 X X = 1.1 m. 8:18 AM//8/007 / Design Clarifier Tank(Skert)/Detention Time&Paddle Area

13 Diameter Paddle = 5.8 m. Sweep Area = πd = 6.60 m Paddle Area = 10 % of Sweep area(bhole,a.g, Personal Communication) =.66 m Assume There are paddle. paddles Length of each paddle = % of Radius of Flocculation selection 70 % - At depth level.7 m. Diameter of Flocculator = 5.8 m. Radius =.91 m. Length of each paddle =.07 m. Area Length x Height of each paddle = = m. 8:18 AM//8/007 / Design Clarifier Tank(Skert)/Detention Time&Paddle Area

14 Slope X1 Dept X1 X X X X 8:18 AM//8/007 / Design Clarifier Tank(Skert)/Detention Time&Paddle Area

15 17 Power Requirement Give Shaft rotation speed = rpm (Design criteria = - rpm.) 17.1 At depth level = 1.5 m. Radius of Paddle = 1.65 m. The rotation speed of paddle = πrn = m/s Design Criteria < 0.9 m/s (Horizontal Shaft with Paddles) 17. At depth level =.5 m. Radius of Paddle = m. The rotation speed of paddle = πrn = m/s Design Criteria < 0.9 m/s (Horizontal Shaft with Paddles) 17. At depth level =.7 m. Radius of Paddle =.07 m. The rotation speed of paddle = πrn = m/s Design Criteria < 0.9 m/s (Horizontal Shaft with Paddles) 18 Calculation Relative of Paddle with respect to water V = 0. 75V paddle m/s 18.1 At depth level = 1.5 m. = m/s V paddle V = m/s 18. At depth level =.5 m. = m/s V paddle V = m/s 18. At depth level =.7 m. = m/s V paddle V = m/s 8:18 AM//8/007 1/1 Design Clarifier Tank(Skert)/Calculation Velocity Paddle

16 19 Calculation Power requirement Theory P 1 = C DΣA pα ( Σv) Where : P = Power requirement of Mixing (watt) or N.m/s C D = Coefficient of drang of Paddle = 1.8 A p = Area of Paddle (m ) α v = mass fluid density (kg/m ) = 1,000 kg/m = Relative velocity of Paddle with respect to water (m/s) Then P = 7.7 watt or N.m/s Efficiency Motor at 60 % = watt or N.m/s (From 1 HP = Kilowatt) Then P = HP 1 HP 8:18 AM//8/007 1/1 Design Clarifier Tank(Skert)/Power Requirement

17 0 Calculation Velocity Gradient (G) Theory Where : G = P μv G = mean velocity gradient (sec -1 ) P = power requirement for mixing (watt) or N.m/s μ = dynamic viscosity (N.s/m ) N.s/m V = volume of the tank (m ) G = sec x G = sec -1 1 Outlet Clarifier Tank Weir Loading = m /m.hr From Diameter D = m. Minus outlet hole side = 1 m. Length of weir = m. Theory Q ( m / hr) Length of weir = Weir Loading ( m / m. hr) Weir Loading = m /m.hr OK. Give Diameter of Orifice = 1 in. = 0.05 m. Give 1 m. of outlet weir have orifice = 5 pores/side side = 50 pores Length of Orifice = 1.7 m./ 1 m. weir 1 side = 0.65 m./ 1 m. weir 8:19 AM//8/007 1/ Velocity Gradient&outlet/Design Clarifier Tank(Skert)

18 Then Free Space of weir = 0.65 m./ 1 m. weir Space between orifice to orifice = m. = 1.6 cm. Give 1 m. of outlet weir have orifice = 5 pores/side side = 50 pores Then total orifice = 61 pores Then sum area of orifice = 0.1 m Flow Rate pass through 1 orifice = 0. m /hr Each of orifice area = πd Each of orifice area = m Theory Q = Av Velocity pass through each orifice = m/s 8:19 AM//8/007 / Velocity Gradient&outlet/Design Clarifier Tank(Skert)

19 Launder Collection Water at Central Tank Launder 8:19 AM//8/007 / Velocity Gradient&outlet/Design Clarifier Tank(Skert)

20 Inlet Structure From Static Mixer Design criteria velocity pass through static mixer = 1 - m/s Select velocity = 1.5 m/s Theory Q = Av Q Area = m v = m Circular pipe area = πd D D = = m. = in. 7 in. Calculation Surface Loading (Sedimentation Zone) Surface Area at Sedimentation Zone = π D D outside inside + xlaunderswidth π D outside D inside + ( xlaunders width ) = m. = m. Surface Area at Sedimentation Zone = m Surface Loading = Q A = m/hr. Design Criteria m/hr upflow (radial upflow type) Text Book (Chularrongkron University <. m/hr. Water Works Engineering m/hr 8:19 AM//8/007 1/1 Inlet structure&surface loading/design Clarifier Tank(Skert)

1 Turbidity = NTU 2 ph = Alkalinity = 34 mg/l as CaCO 3 4 Temperature = 5 Fe = 2 mg/l 6 Mn = mg/l 7 Total Hardness = 50mg/l as CaCO 3

1 Turbidity = NTU 2 ph = Alkalinity = 34 mg/l as CaCO 3 4 Temperature = 5 Fe = 2 mg/l 6 Mn = mg/l 7 Total Hardness = 50mg/l as CaCO 3 DESIGN CALIFIER TANK (SLUDGE BLANKET CLARIFIER TYPE : SLUDGE RECIRCULATION) 1. Flow Rate Q 150 m 3 /hr. Raw Water Quality input 1 Turbidity NTU ph 8.3 3 Alkalinity 3 mg/l as CaCO 3 Temperature 5 Fe mg/l