Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residence time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste activated sludge. Although the main purpose of an equalization basin is to give a relatively constant flow rate to downstream treatment operations and processes, a secondary benefit is the removal of some of the total suspended solids.
Enter T next to the following true statements and F next to the false statements. Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation. Thickening prior to digestion is common in many wastewater treatment plants because it reduces the size needed for the digester. Based on a temperature of 30°C, a design mean cell residence time of about 20 days would be reasonable for a completely-mixed anaerobic digester without recycle. A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g) at 250°C. The theoretical yield coefficient can be estimated from the observed yield coefficient if the specific growth rate constant is known. Air flotation would likely be more efficient for thickening waste activated sludge than primary sludge, while the opposite would be true for gravity thickening. The net mass of cells produced in the activated sludge process equals the total cell mass synthesized minus the cell mass wasted as waste activated sludge. Although the main purpose of an equalization basin is to give a relatively constant flow rate to downstream treatment operations and processes, a secondary benefit is the removal of some of the total suspended solids.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Enter T next to the following true statements and F next to the false statements.
Settling of suspended solids in secondary clarifiers is typical of Type II sedimentation.
Thickening prior to digestion is common in many wastewater treatment plants because it
reduces the size needed for the digester.
Based on a temperature of 30°C, a design mean cell residenee time of about 20 days
would be reasonable for a completely-mixed anaerobic digester without recycle.
A volatile suspended solid is defined as an organic solid that can be oxidized to CO2 (g)
at 250°C.
The theoretical yield coefficient can be estimated from the observed yield coefficient if
the specific growth rate constant is known.
Air flotation would likely be more efficient for thickening waste activated sludge than
primary sludge, while the opposite would be true for gravity thickening.
The net mass of cells produced in the activated sludge process equals the total cell mass
synthesized minus the cell mass wasted as waste activated sludge.
Although the main purpose of an equalization basin is to give a relatively constant flow
rate to downstream treatment operations and processes, a secondary benefit is the
removal of some of the total suspended solids.
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