1. EG-CE 441 Environmental Engineering Homework #3 (Due 10/15/13) (Show your calculations) 1. A wastewater stream has a BOD5 of 150 mg/L, and the BOD rate constant is 0.20/day (base e). The BODultimate of this wastewater = 237 mg/L. The BOD7 of this wastewater =179 mg/L. 2. Calculate the theoretical oxygen demand of 10-4M ethanol, CH3CH2OH. ThOD = 9.6mg/L. 3. Use the information given in the following table to answer the question: Compound Sodium chloride Sand and clay Coffee grounds AlcoholConcentration (mg/L) 10 90 30 80Dissolves?Burns or volatilizes at 550 oC?Yes No No YesNo No Yes Yes TSS = 120 mg/L. VSS = 30 mg/L. TDS =10mg/L. FDS = 10 mg/L.4. A wastewater stream is being discharged into a river that has a temperature of 15 oC. What fraction of the maximum oxygen consumption has occurred in five days if the BOD rate constant determined in the laboratory under standard condition is 0.25/day (base e)? 48.6% 5. A constant volume batch reactor was operated to provide data for determination of reaction rate constant for ultraviolet enhanced ozonation of a synthetic organic compound. The duration of the batch reaction was 1 hr and the concentration of the organic compound was reduced from 200 g/L to 10 g/L. If the reaction is assumed to be first-order with respect to this synthetic compound, then determine the rate constant for the oxidation reaction in 1/hr. 3.0 hr-1 6. What would be the half-life of the compound in the reactor in question #5? 0.231hr 7. The chlorine dose for a 10 MGD water treatment plant is 8 mg/L. The peak factor is 1.8. Determine the monthly usage of chlorine at this plant. 2.0x104 lbs/mo