3. Suppose you are to measure the BOD removal rate for a primary wastewater treatment plant.You take 2 samples of raw sewage on its way into the plant and two samples of the effluentleaving the plant. Standard 5-day BOD tests are run on the four samples, with no seedingproducing the following data:SampleDilutionDoi (mg/L)DOf (mg/L)Source1Raw1:309.02.22Raw1:209.0?3Treated1:158.51.54Treated?9.01a. Find the BOD5 for the raw and treated sewage, and the percent removal of BOD in thetreatment plant.b. Find the DO that would be expected in sample 2 at the end of the test.c. What would be the maximum volume of treated sewage for sample 4 that could be put intothe 300 mL BOD bottle and still have the DO after 5 days remain above zero?

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3. Suppose you are to measure the BOD removal rate for a primary wastewater treatment plant. You take 2 samples of raw sewage on its way into the plant and two samples of the effluent leaving the plant. Standard 5-day BOD tests are run on the four samples, with no seeding producing the following data: Sample DOi (mg/L) DOf (mg/L) TEP Source Dilution 1 Raw 1:30 9.0 2.2 2 Raw 1:20 9.0 3 Treated 1:15 8.5 1.5 4 Treated ? 9.0 1 a. Find the BOD5 for the raw and treated sewage, and the percent removal of BOD in the treatment plant. b. Find the DO that would be expected in sample 2 at the end of the test. c. What would be the maximum volume of treated sewage for sample 4 that could be put into the 300 ml BOD bottle and still have the DO after 5 days remain above zero?

3. Suppose you are to measure the BOD removal rate for a primary wastewater treatment plant. You take 2 samples of raw sewage on its way into the plant and two samples of the effluent leaving the plant. Standard 5-day BOD tests are run on the four samples, with no seeding producing the following data: Sample DOi (mg/L) DOf (mg/L) TEP Source Dilution 1 Raw 1:30 9.0 2.2 2 Raw 1:20 9.0 3 Treated 1:15 8.5 1.5 4 Treated ? 9.0 1 a. Find the BOD5 for the raw and treated sewage, and the percent removal of BOD in the treatment plant. b. Find the DO that would be expected in sample 2 at the end of the test. c. What would be the maximum volume of treated sewage for sample 4 that could be put into the 300 ml BOD bottle and still have the DO after 5 days remain above zero?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

3. Suppose you are to measure the BOD removal rate for a primary wastewater treatment plant.
You take 2 samples of raw sewage on its way into the plant and two samples of the effluent
leaving the plant. Standard 5-day BOD tests are run on the four samples, with no seeding
producing the following data:
Sample
Dilution
Doi (mg/L)
DOf (mg/L)
Source
1
Raw
1:30
9.0
2.2
2
Raw
1:20
9.0
?
3
Treated
1:15
8.5
1.5
4
Treated
?
9.0
1
a. Find the BOD5 for the raw and treated sewage, and the percent removal of BOD in the
treatment plant.
b. Find the DO that would be expected in sample 2 at the end of the test.
c. What would be the maximum volume of treated sewage for sample 4 that could be put into
the 300 mL BOD bottle and still have the DO after 5 days remain above zero?

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