Question

what is biochemical oxygen demand? select one: o a. amount of oxygenrequired to decay a certain amount of organic matter o b. a necessary material that is in short supply o c. the amount of oxygen animals need o d. method by which settled organic matter is returned to aeration tanks

Explanation:

Biochemical oxygen demand (BOD) is defined as the amount of oxygen required by aerobic microorganisms to decompose organic matter in water over a specific period of time.

Answer:

A. amount of oxygen required to decay a certain amount of organic matter