Question

# Introduction to environmental (4-1, DC 332) Glutamic acid (C5H9O4N) is used as one of the reagents...

Introduction to environmental

(4-1, DC 332) Glutamic acid (C5H9O4N) is used as one of the reagents for a standard to check the BOD test. Determine the theoretical oxygen demand of 150 mg/L of glutamic acid. Assume the following reactions apply:

C5H9O4N + 4.5O2 →5CO2 + 3H2O + NH3

NH3 + 2O2 → NO3- + H+ + H2O

1. (4-3, DC 332) If the BOD5 of a waste is 220 mg/L and the ultimate BOD is 320 mg/L, what is the rate constant (base 10)?
2. (4-5, DC 332) Convert the rate constant found in problem 2 to base e.
3. (4-7, DC 332) Assuming that the data in problem 2 were taken at 20 oC, compute the rate constant at temperature of 15 oC.
4. (4-15, DC 333) Using the Thomas Method, calculate the BOD rate constant ((in base e) from the following data:

 t, day 2 5 10 20 35 BOD, mg/L 86 169 236 273 279.55

1. Solids: The laboratory analysis of 25 mL sample after filtration gave the following data:
• Weight of the filter disk after drying at 103 oC and 550 oC = 5.31g
• Weight of the filter disk and sample after drying at 103 oC = 5.374g
• Weight of the filter disk and sample after igniting at 550 oC = 5.339g

Determine the concentrations (in mg/L) of: a) Total suspended solids (TSS), b) Volatile suspended solids (VSS), and c) Fixed suspended solids (FSS) of the water sample.

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