MICROORGANISMS IN WATER ALTER LEVELS OF DISSOLVED OXYGEN

Which should have a greater capacity to decompose organic matter aerobically a still pond or a babbling brook [Pg.568]

Was this your answer The capacity for aerobic decomposition is limited by the amount of dissolved oxygen. In a babbling brook, aeration guarantees that any dissolved oxygen lost to aerobic decomposition is quickly replaced. [Pg.569]

Sewage entering a river dramatically decreases the level of dissolved oxygen in the water. Because it takes time for aerobic bacteria to decompose organic wastes and because rivers flow, the drop in dissolved oxygen is often most pronounced far downstream. Fish start to die when the concentration of dissolved oxygen dips below 3 milligrams/liter. [Pg.568]

Aerobic microorganisms decompose this organic matter to the point that the water loses all its dissolved oxygen, and anaerobic microorganisms start functioning. This [Pg.569]

Big Chemical Encyclopedia