ENVIRONMENTAL ENGINEERING-WATER POLLUTION: Incoming wastewater, with BOD5 equal to 200mg/L, is treated in a well-run secondary treatment plant that removes 90% of the BOD. You are to run a five-day BOD test with a standard 300mL bottle, using a mixture of treated sewage and dilution water (no seed). Assume the initial DO is 9.2 mg/L. FIND: Roughly what maximum volume of treated wastewater should be put into the bottle in you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)? If you make a mixture of half water and half treated wastewater, what DO would you expect after five day?
ENVIRONMENTAL ENGINEERING-WATER POLLUTION: Incoming wastewater, with BOD5 equal to 200mg/L, is treated in a well-run secondary treatment plant that removes 90% of the BOD. You are to run a five-day BOD test with a standard 300mL bottle, using a mixture of treated sewage and dilution water (no seed). Assume the initial DO is 9.2 mg/L. FIND: Roughly what maximum volume of treated wastewater should be put into the bottle in you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)? If you make a mixture of half water and half treated wastewater, what DO would you expect after five day?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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ENVIRONMENTAL ENGINEERING-WATER POLLUTION:
Incoming wastewater, with BOD5 equal to 200mg/L, is treated in a well-run secondary treatment plant that removes 90% of the BOD. You are to run a five-day BOD test with a standard 300mL bottle, using a mixture of treated sewage and dilution water (no seed). Assume the initial DO is 9.2 mg/L.
FIND:
- Roughly what maximum volume of treated wastewater should be put into the bottle in you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)?
- If you make a mixture of half water and half treated wastewater, what DO would you expect after five day?
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