Using the EPA equation and the data from Problem 2-11, calculate the rinse water

Question

Using the EPA equation and the data from Problem 2-11, calculate the rinse water flow rate for one. two. three, four and five rinse tanks in series using a computer spread sheet you have written. Use the spreadsheet graphing function to plot a graph of rinse water flow rate versus number of rinse tanks. If biodegradable organic matter, oxygen, and microorganisms are placed in a closed bottle, the microorganisms will use the oxygen in the process of oxidizing the organic matter. The bottle may he treated as a hatch reactor and the decay of oxygen may he treated as a first-order reaction. Write the general mass balance equation for the bottle. Using a computer spread sheet program you have written, calculate and then plot the concentration of oxygen each day for a period of 5 days starting with a concentration of 8 mg/L. Use a rate constant of 0.35 d-1 Answer: day 1 = 5.64 or 5.6 mg/L; day 2 = 3.97 or 4.0 mg/L In 1908. H. Chick reported an experiment in which he disinfected anthrax spores with a 5 percent solution of phenol (Chick. 1908). The results of his experiment are tabulated below. Assuming the experiment was conducted in a completely mixed batch reactor, determine the decay rate constant for the die-off of anthrax.

Explanation / Answer

ln(A)= -kt+ln(Ao) Ao = initial concentration k = rate constant t= time for day 1 ln(A) =- 0.35*1 +ln 8 ( A)= 5.63 mg/l for day 2 ln(A) = -0.35 *2 +ln8 (A)=3.97mg/l for day 3 (A)= 2.79mg/l for day4 (A)=1.97 mg/l for day 5 (A) = 1.39 mg/l

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