GATE Civil Engineering (CE) 2014 Shift 2 Solved Paper

An effluent of a flow rate of 2670 m³/day from a sewage treatment plant is to be disinfected. The laboratory data of disinfection studies with a chlorine dosage of 15 mg/litre yield the model N_t = N_o e^(-0.145t) where N_t = Number of organisms remained at any time t (in 'min')and N_o = Number of initial organisms at time t = 0. The volume of disinfection unit (in m³) required to achieve a 98 % kill of micro-organisms is ______________