EXAMPLE: Waterworks of a town treat 35 x 106 litres/day. The water is treated by coagulation-sedimentation tanks. The quantity of filter alum is consumed at 20 mg/litres of water. If the alkalinity of the raw water is equivalent to 4.5 mg/litre of CaCO3, determine the quantity of filter alum and the quick lime (containing 80% of CaO) required per month by the water works. Molecular weights are given as [Ca = 40, C = 12, S = 32, O = 16, Al = 27 and H=1]

EXAMPLE: Waterworks of a town treat 35 x 106 litres/day. The water is treated by coagulation-sedimentation tanks. The quantity of filter alum is consumed at 20 mg/litres of water. If the alkalinity of the raw water is equivalent to 4.5 mg/litre of CaCO3, determine the quantity of filter alum and the quick lime (containing 80% of CaO) required per month by the water works. Molecular weights are given as [Ca = 40, C = 12, S = 32, O = 16, Al = 27 and H=1]

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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(a) Acidity of water is significant in water supply system. why?
2. A water treatment plant having an average daily flow rate of 53 MGD (MGD = million gallons per day) adds lime during softening at a dosage of 220 mg/L. Calculate the mass of lime in metric tons/c that must be supplied each day.
2. 1 Jar tests have indicated that 80 mg/L of alum are required to coagulate water for drinking water treatment. The source water contains 180 mg/L alkalinity as CaCO3 and 10 mg/L of suspended solids. The treatment plant capacity is 0.5 m³/s. How much alkalinity remains in the water after coagulation?
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A river water was taken for analysis. The results for anions and cations analysis are shown below, 165 mg/l 70 mg/l HCO, 2+ Ca Са 173 mg/l 30 mg/1 SO42 2+ Mg 202 mg/l 125 mg/l ci Na Determine and justify either the analysis is acceptable or not. II II II