Determine the diameter of the vertical pipe needed for a flow of a liquid of kinematic viscosity 1.95 x 10^-3 m^2s^-1 at a Reynolds number of 1500. The constant pressure is maintained throughout its length.

2Medium

A town with population of 1 lakh is supplied with 150 lpcd of water. The chlorine required for disinfection was found to be 0.28 mg/l and residual chlorine required was 0.2 mg/l. Estimate the chlorine dose and quantity of bleaching powder required per year (in kg/year), if available chlorine in bleaching powder is 30%.

3Medium

5% diluted wastewater was subjected to BOD test and the following observations are recorded: DO of water used for dilution = 3.6 mg/l; DO of wastewater sample = 0.8 mg/l; DO in sample after 5 days = 0.7 mg/l; k20 = 0.12/day. Determine:

(i) BOD of wastewater;

(ii) ultimate BOD.

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