One of your friends, Rasta, works at a local wastewater treatment plant (WWTP) in his hometown. Despite the plant having several process steps, Rasta is adamant that the dominant process step is biological treatment which happens in a 500 m3 bioreactor. The water flows to the bioreactor at a rate of 1.6m3/minute. The conditions inside the bioreactor favor extreme production of nitrogen (N), from the degradation of amino acids found in the wastewater, during the first half of each day. By midday the concentration of nitrogen in the bioreactor is almost always 2 mg/L. Since nitrogen is regulated, Rasta must then get the concentration down to half of this concentration within one hour. The influent (into the bioreactor) has no nitrogen. Rasta has two alternatives to facilitate the process. The first option is to increase the throughput rate by 150%. The second option is to keep the normal throughput rate and add an adsorbent “pillow” that removes nitrogen with a rate of 0.01/minute. Can either or both methods get the levels of nitrogen inside the bioreactor low enough in 60 minutes? N:B 1. State the objective of the problem in your own words. For example, “The objective of problem #1 is to determine the total mass (in kg) of carbon dioxide emitted from my Hummer during my 25 km commute from Bedfordview to Braamfontein every work day.” 2. Identify the physical setting of the problem using a well labeled figure of the system or a brief statement of the physical setting: list of important parameters, dimensions, constants, etc. 3. Solve the problem showing all assumptions and without skipping any steps. Make sure that all parameters have clearly indicated and correct units. Include a brief running summary so that I can follow exactly what you have done.
One of your friends, Rasta, works at a local wastewater treatment plant (WWTP) in his hometown. Despite the plant having several process steps, Rasta is adamant that the dominant process step is biological treatment which happens in a 500 m3 bioreactor.
The water flows to the bioreactor at a rate of 1.6m3/minute. The conditions inside the bioreactor favor extreme production of nitrogen (N), from the degradation of amino acids found in the wastewater, during the first half of each day. By midday the concentration of nitrogen in the bioreactor is almost always 2 mg/L. Since nitrogen is regulated, Rasta must then get the concentration down to half of this concentration within one hour. The influent (into the bioreactor) has no nitrogen. Rasta has two alternatives to facilitate the process. The first option is to increase the throughput rate by 150%. The second option is to keep the normal throughput rate and add an adsorbent “pillow” that removes nitrogen with a rate of 0.01/minute. Can either or both methods get the levels of nitrogen inside the bioreactor low enough in 60 minutes?
N:B
1. State the objective of the problem in your own words. For example,
“The objective of problem #1 is to determine the total mass (in kg) of
carbon dioxide emitted from my Hummer during my 25 km commute
from Bedfordview to Braamfontein every work day.”
2. Identify the physical setting of the problem using a well labeled figure
of the system or a brief statement of the physical setting: list of
important parameters, dimensions, constants, etc.
3. Solve the problem showing all assumptions and without skipping any
steps. Make sure that all parameters have clearly indicated and correct
units. Include a brief running summary so that I can follow exactly what
you have done.
Step by step
Solved in 3 steps with 1 images
