This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: a point of mixing. You are told the BOD 5 in the river after mixing is 37 mg/L. What is the BOD 20 at the point of mixing. What is common between the two numbers? Why are the numbers different? Problem 4: A 500 ml BOD bottle is dosed with 50 of sewage and aerated until the bottles oxygen is at 85% of saturation. The bottle is sealed. The oxygen level in the bottle is 2.5 mg/l after five days. What was the BOD 20 of the undiluted wastewater sample? (neglect BOD of dilution water) Problem 5: After you finish measuring the dissolved oxygen in the BOD bottle described in Problem 4, you re-aerate it and close it up again. How much dissolved oxygen will be left in the bottle after five days?...
View Full Document
- Spring '10