2) For the BOD measurement routine, 3 mL of a wastewater was added to a BOD bottle (300 ml) and
the clean water was added to fill up the bottle. The
dissolved oxygen DO was measured in this bottle as
9.4 mg/L and then the bottle was incubated for 5
days. The DO measured after 5 days was 2.3 mg/L.
The BOD of the wastewater (in mg/L) was (rounded to
1 decimal place).
2points​