6, (15%) (a) Describe the step of the BOD test (b) Describe how to correct seed

Question

6, (15%) (a) Describe the step of the BOD test (b) Describe how to correct seed bacteria in BOD test (c) Derive test L(t) In (-:2--kt for a BOD test. Start your answer by defining L() = BODL_ BOD(). Assume first-order decay of L during (c) Derive In (Y) =-kt for a BOD testin BODtest(ie. L t vs. time. You will have to gues click onplottedda alayR-s ven below plot L(t) (d) BOD test results are given below, plot . time. You will have to guess a value for BOD. Assume BODL is 400 mg- O/L. Find the first order kinetic constant k from the plot. (If you use MS Excel, right click on plotted data points, choose "Add Trendline," check for "Linear," set "O" for "Set Interception," and check for "Display equation" and "Display R-square value.") Show the resulting plot in your answer. Once k is found, calculate BOD and compare it with the initial guess In revalued) Show Incubation time (days) Measured BOD (mg O2/L) 4 201 0 72 102 156 221 (e) If the initial guess of BODL (400 mg/L) were not given, write a short discussion on how you would find BODL

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6, (15%) (a) Describe the step of the BOD test (b) Describe how to correct seed

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