You and your team have decided to build an aerated lagoon to treat the waste generated by a local village in a developing country. You estimate that the influent flow rate will be around 40 m³/d and the BOD5 roughly 250 mg/L. To avoid impacting the river that will receive the effluent, the BOD5 must be reduced to 15 mg/L. Based on your experimental lab work, you have determined the following microbial kinetic parameters: = Ks 100 mg-BOD5/L ka = 0.1 d¹ μm = 1.6 d Y = 0.6 mg-VSS/mg-BOD5 (a) To meet the effluent BOD5 limit, what must the hydraulic retention time (HRT) be in the lagoon? (b) What mass of microbes will be produced in the lagoon each day? How could this be problematic for the operation of the lagoon?
You and your team have decided to build an aerated lagoon to treat the waste generated by a local village in a developing country. You estimate that the influent flow rate will be around 40 m³/d and the BOD5 roughly 250 mg/L. To avoid impacting the river that will receive the effluent, the BOD5 must be reduced to 15 mg/L. Based on your experimental lab work, you have determined the following microbial kinetic parameters: = Ks 100 mg-BOD5/L ka = 0.1 d¹ μm = 1.6 d Y = 0.6 mg-VSS/mg-BOD5 (a) To meet the effluent BOD5 limit, what must the hydraulic retention time (HRT) be in the lagoon? (b) What mass of microbes will be produced in the lagoon each day? How could this be problematic for the operation of the lagoon?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:You and your team have decided to build an aerated lagoon to treat the waste generated by a local
village in a developing country. You estimate that the influent flow rate will be around 40 m³/d and
the BOD5 roughly 250 mg/L. To avoid impacting the river that will receive the effluent, the BOD5
must be reduced to 15 mg/L. Based on your experimental lab work, you have determined the
following microbial kinetic parameters:
=
Ks 100 mg-BOD5/L
ka = 0.1 d¹
μm = 1.6 d
Y = 0.6 mg-VSS/mg-BOD5
(a) To meet the effluent BOD5 limit, what must the hydraulic retention time (HRT) be in the lagoon?
(b) What mass of microbes will be produced in the lagoon each day? How could this be problematic
for the operation of the lagoon?
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