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Carl Harvey L. Aque Napple Donn Jerico Buhian Janne Mary Daluz Problem: It is proposed to design a sedimentation tank for the wash waters coming from fruit washing plant of 150 tons of fruit/day plant which requires approximately 50 m³ of water per ton of fruits. The initial load of dust and dirt in the wash water is 2 g/L and it is to be concentrated to 10 times of the solid concentration in the underflow of sedimentation tank. Find minimum area of tank using (a) Talmadge and Fitch Method (b) Solid Flux Method (Kynch Method) t, min Height of Interface Z, cm 0 48 1 28 2 23.4 3 20.6 4 18.4 5 16.8 6 15.7 7 14.8 8 14 10 12.8 12 11.8 14 11.2 16 10.6 18 10.4 20 10.2 26 10

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Analysis: a.) Talmadge and Finch Method The given table was plotted on Microsoft Excel given time t on the x-axis and height z on the y- axis which was shown on figure 1. Tangent lines were drawn on the initial and final legs of the settling curve. To get critical concentration C c , the angle of intersection of the tangent lines was bisected extending to the settling curve. The point will be the critical concentration. Another tangent line was

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