Extracted text: 1. The dissolved oxygen (DO) in an unseeded sample of diluted waste having an initial DO of 9.5 mg/l is measured to be 3.5 mg/l after 5 days. The dilution factor is 0.03 and reaction rate constant, k = 0.22/day (to the base 'e' in the decay curve at 20°C). Estimate- %3D (a) The 5-day BOD of waste at 20°C (b) Ultimate carbonaceous BOD. noo (C) Remaining oxygen demand after 5-days nene(d) The 5-day BOD of this waste at 25°C assuming a temperature coefficient of 1.047