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A sample of wastewater is diluted 10 times. The diluted solution has an ultimate biochemical oxygen demand (BOD), Lo, of 30 mg/L and a reaction rate constant, k, of 0.20/d. The values of ultimate BOD and the reaction rate constant of the original wastewater are most nearly _____.

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ajeigbeibraheem

Answer:

474.59 mg/L

Explanation:

Given that

BOD = 30 mg/L

Original BOD  = 30 mg/L × dilution factor

Original BOD  = 30 mg/L  × 10 = 300 mg/L

[tex]L_o = \frac{BOD}{1-e^{-5t}}[/tex]

here [tex]L_o[/tex] is the ultimate BOD ; BOD is the  biochemical oxygen demand ;  t = 0.20 /day

[tex]L_o = \frac{300}{1-e^{-5(0.20)}}[/tex]

[tex]L_o = 474.59 \ mg/L[/tex]

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