1 CVEN3502 Workshop BOD, Screening and Grit Removal QUESTION 1 (Mines, Chapter 3, Q12). A five-day BOD test is performed on an industrial wastewater sample that contains no bacteria; therefore, a “seeded” BOD test is run. 10 ml of “seed” are added to 20 L of dilution water. 30 ml of industrial wastewater are added to a 300 ml BOD bottle and the remaining volume consists of “seeded” dilution water. The average dissolved oxygen concentration of the diluted wastewater samples and blanks (seeded dilution water) on the first day of the test is 7.5 mg/L and 9.0 mg/L, respectively. After incubating separate BOD bottles at 20°C for five days, the average DO concentration of the diluted wastewater BOD bottles and seeded dilution water BOD bottles is 3.1 and 8.5 mg/L, respectively. Calculate the five-day BOD of the industrial wastewater. QUESTION 2 (Mines, Chapter 7, Q4). Estimate the head loss through a course screen before and after the accumulation of solids occurs. Assume the following conditions for solving the problem. The approach velocity and
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