Question

A water treatment plant is being installed in a city. The following design parameters have been proposed for a low-turbidity coagulation/flocculation system of the plant: flow rate (Q) = 2 m3/s, flocculation detention time (t) = 20 mins, flocculation G = 30 s-1, operating temperature = 18°C (take dynamic viscosity, µ = 1.053 × 10-3 Pa.s). The flocculation basin is to be divided into 3 equal compartments. The mixing intensity is tapered such that it is reduced by 50% from the first compartment to the last compartment to yield an average G of 30 s-1. Determine the following parameters of the flocculation system: (i) The volume of each compartment of the flocculation basin (ii) The design G of each of the three compartments of the basin (iii) The average maximum volume of water that can be mixed, assuming the available mixer has 11.19 kW motor power with 80% efficiency of transfer of motor power to water power (iv) Given that each of the three compartments whose volume was determined in (i) is further divided into 3 compartments (so a total of 9 compartments) so that the mixer power is not limiting, and assuming a typical water depth of 4 m in the flocculator and a square tank arrangement, determine the dimensions of each tank compartment

          A water treatment plant is being installed in a city. The following design parameters have been proposed for a low-turbidity coagulation/flocculation system of the plant: flow rate (Q) = 2 m3/s, flocculation detention time (t) = 20 mins, flocculation G = 30 s-1, operating temperature = 18°C (take dynamic viscosity, µ = 1.053 × 10-3 Pa.s). The flocculation basin is to be divided into 3 equal compartments. The mixing intensity is tapered such that it is reduced by 50% from the first compartment to the last compartment to yield an average G of 30 s-1. Determine the following parameters of the flocculation system: (i) The volume of each compartment of the flocculation basin (ii) The design G of each of the three compartments of the basin (iii) The average maximum volume of water that can be mixed, assuming the available mixer has 11.19 kW motor power with 80% efficiency of transfer of motor power to water power (iv) Given that each of the three compartments whose volume was determined in (i) is further divided into 3 compartments (so a total of 9 compartments) so that the mixer power is not limiting, and assuming a typical water depth of 4 m in the flocculator and a square tank arrangement, determine the dimensions of each tank compartment

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