The Ohio EPA has projected the dissolved oxygen in the Mahoning River to be less than...

 

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The Ohio EPA has projected the dissolved oxygen in the Mahoning River to be less than 4.0 g/m3 during low-flow conditions; therefore, discharges of BOD demanding substances will be restricted along the river. As a new engineer, you've been asked to determine if the EPA's recommended treatment is excessive. You've obtained determine the waste's ultimate BOD (BOD) and reaction rate constant, k. The lab representative waste from each company along the river and performed laboratory tests to results from Pollutors-R-Us are given below. Day 0 1 2 3 4 5 6 30 ml 8.21 4.8 0.45 0 0 0 Bottle size: 300 ml Dissolved Oxygen [g/m] 15 ml Temp: 20C 8.87 7.76 6.15 5.49 4.51 3.8 3.05 6 ml 8.97 8.59 8.51 8.33 8.16 8.01 7.87 blank 9.0 8.93 8.86 8.79 8.72 8.65 8.51 a) Determine BODu and k using Thomas graphical and Thomas slope method. Report the best method (based on difference squared). b) With the 'best values' from part a, calculate the BOD5 and k if the temperature of the river was raised to 25C. The Ohio EPA has projected the dissolved oxygen in the Mahoning River to be less than 4.0 g/m3 during low-flow conditions; therefore, discharges of BOD demanding substances will be restricted along the river. As a new engineer, you've been asked to determine if the EPA's recommended treatment is excessive. You've obtained determine the waste's ultimate BOD (BOD) and reaction rate constant, k. The lab representative waste from each company along the river and performed laboratory tests to results from Pollutors-R-Us are given below. Day 0 1 2 3 4 5 6 30 ml 8.21 4.8 0.45 0 0 0 Bottle size: 300 ml Dissolved Oxygen [g/m] 15 ml Temp: 20C 8.87 7.76 6.15 5.49 4.51 3.8 3.05 6 ml 8.97 8.59 8.51 8.33 8.16 8.01 7.87 blank 9.0 8.93 8.86 8.79 8.72 8.65 8.51 a) Determine BODu and k using Thomas graphical and Thomas slope method. Report the best method (based on difference squared). b) With the 'best values' from part a, calculate the BOD5 and k if the temperature of the river was raised to 25C.

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The image provides data from a biochemical oxygen demand BOD experiment which is used to measure the amount of oxygenconsuming organic matter in a wat... View the full answer