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Wastewater containing raw sewage is being discharged into a river. The following information is known: a. A sample of the wastewater is collected and a standard five-day BOD test is run on a mixture of 10mL of the wastewater plus 290mL of pure dilution water. The initial DO of the mixture is 8.8mgL, and the DO after five days is determined to be 2.2mg/L. What is the BOD of the wastewater in mg/L ? b. Additional measurements were taken to determine that the deaeration rate constant of the BOD,kd, is 0.255 day 1 for this wastewater at 20C. What is the temperature-corrected deaeration rate constant for the 15C river and wastewater discharge? Use =1.047 for the temperature correction. c. What is the ultimate BOD(L0,w) for the wastewater in mg/L ? d. Determine the saturation dissolved oxygen concentration in mgL for the river using Henry's law and Table 2.4. The volume fraction of oxygen in air is 0.21. e. Determine the ultimate BOD in mg/L of the mixture of river water and wastewvater, immediately after the mixing point. Assume complete and instantaneous mixing (no reaction occurs during the mixing). f. Determine the initial dissolved oxygen concentration (D00) and the initial dissolved oxygen deficit (D0) of the mixture of river water and wastewater, immediately after the mixing point. Report both in units of mgL. Assume complete and instantaneous mixing. g. Determine the reaeration rate constant, k (day 1), in the river at 15C. For the temperature correction of kr, use =1.024. h. A fishery is located 60km downstream of the waste discharge. Determine the remaining BOD and the dissolved oxygen concentration at this location. Report both in mg/L. i. Determine the distance (in km) downstream of the waste discharge where the critical point of the oxygen sag curve occurs, and the dissolved oxygen concentration (in mg L ) at the critical point (DO,mie)