CHEN 452 - Water and Wastewater Treatment Spring 2023 HW\#5 1. A wastewater stream has a BOD of 4000mg/L. Calculate the flowrate of BOD (in kg/hr) if the wastewater has a flowrate of 5000m3/hr. Assume, if necessary, the density of wastewater as 1.05g/cm3 2. A sample of wastewater has an ultimate BOD of 280mg/L and a 5 -day BOD of 240mg/L. Calculate 20-day BOD of this sample. 3. Determine the 5-day BOD for a 15ml sample that is diluted with dilution water to a total volume of 300ml when the initial DO concentration is 8mg/1 and after 5 days, has been reduced to 2mg/l. Due date: January 26, 2023 - Week\#9