A contaminant is present in an industrial wastewater at a concentration of 268 mg/L and can be degraded according to a first-order reaction. Previous research has identified that K = 5.2/hr. The contaminant is regulated at 2.5 mg/L and must be removed prior to discharge to the sewer. a. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal continuously-stirred tank reactor (CSTR). b. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal plug flow reactor (PFR). c. If the wastewater flowrate is 7,000 gallons/day (gpd), identify the volume required (in gallons and ft) for ideal CSTR and PFR treatment system to achieve the target effluent concentration of 2.5 mg/L. d. Management would like to use two 500 gallon tanks operated as two-CSTRS in series to treat the wastewater at a flowrate of 7,000 (gpd). Will this be satisfactory for discharge? Justify your response with a suitable calculation.
A contaminant is present in an industrial wastewater at a concentration of 268 mg/L and can be degraded according to a first-order reaction. Previous research has identified that K = 5.2/hr. The contaminant is regulated at 2.5 mg/L and must be removed prior to discharge to the sewer. a. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal continuously-stirred tank reactor (CSTR). b. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal plug flow reactor (PFR). c. If the wastewater flowrate is 7,000 gallons/day (gpd), identify the volume required (in gallons and ft) for ideal CSTR and PFR treatment system to achieve the target effluent concentration of 2.5 mg/L. d. Management would like to use two 500 gallon tanks operated as two-CSTRS in series to treat the wastewater at a flowrate of 7,000 (gpd). Will this be satisfactory for discharge? Justify your response with a suitable calculation.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A contaminant is present in an industrial wastewater at a concentration of 268 mg/L and can be
degraded according to a first-order reaction. Previous research has identified that K
contaminant is regulated at 2.5 mg/L and must be removed prior to discharge to the sewer.
1.
5.2/hr. The
a. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent
concentration of 2.5 mg/L in an ideal continuously-stirred tank reactor (CSTR).
b. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent
concentration of 2.5 mg/L in an ideal plug flow reactor (PFR).
If the wastewater flowrate is 7,000 gallons/day (gpd), identify the volume required (in gallons and
ft') for ideal CSTR and PFR treatment system to achieve the target effluent concentration of 2.5
mg/L.
d. Management would like to use two 500 gallon tanks operated as two-CSTRS in series to treat the
wastewater at a flowrate of 7,000 (gpd). Will this be satisfactory for discharge? Justify your
response with a suitable calculation.
c.
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