Primary clarifier Primary clarifier are usually designed to

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Primary clarifier

Primary clarifier

• Primary clarifier are usually designed to remove particles with settling rate of

• Primary clarifier are usually designed to remove particles with settling rate of 0. 3 – 0. 7 mm/sec. • Two types of primary clarifiers • 1. rectangular • 2. circular.

Clarifier Loading Calculations Detention Time (DT) = Tank Volume, MG X 24 Flow into

Clarifier Loading Calculations Detention Time (DT) = Tank Volume, MG X 24 Flow into Tank, MGD Surface Overflow Rate (SOR) Flow, gallons/day = Surface Area, ft 2 gallons/day Weir Overflow Rate (WOR) = Flow, Length of Weir, ft Solids Loading = Solids, lbs/day Surface Area, ft 2

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Example 1: If a tank is 10 ft long and 5 ft wide, what is the surface area? SA, ft 2 = 10 ft X 5 ft = 50 ft 2

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Example 2: If a tank is 10 ft 6 inches long and 5 ft 9 inches wide, what is the surface area in sq. ft. ? NOT SA, ft 2 = 10. 6 ft X 5. 9 ft

Converting Inches to Feet 6 inches = 0. 5 ft 6 inches = 12

Converting Inches to Feet 6 inches = 0. 5 ft 6 inches = 12 in/ft So: 10 ft 6 inches = 10. 5 ft 9 inches = 0. 75 ft 9 inches = 12 in/ft So: 5 ft 9 inches = 5. 75 ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Example 2: If a tank is 10 ft 6 inches long and 5 ft 9 inches wide, what is the surface area in sq. ft. ? SA, ft 2 = 10. 5 ft X 5. 75 ft = 60. 4 ft 2

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Work Calculations on Separate Paper Answers Given on Next Slides Practice 1: If a clarifier is 25 ft long and 9 ft wide, what is the surface area in sq. ft. ? Practice 2: If a clarifier is 22 ft 3 inches long and 7 ft 7 inches wide, what is the surface area in sq. ft. ?

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Practice 1: If a clarifier is 25 ft long and 9 ft wide, what is the surface area in sq. ft. ? SA, ft 2 = 25 ft X 9 ft = 225 ft 2

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft

Surface Area Calculations Rectangles Surface Area, ft 2 = Length, ft X Width, ft Practice 2: If a clarifier is 22 ft 3 inches long and 7 ft 7 inches wide, what is the surface area in sq. ft. ?