At endogenous (stationary or equilibrium) phase of growth, the bacterial population has reached the carrying capacity of the biological treatment unit. The bacteria cannot grow indefinitely due to (1) the lack of an ever-increasing quantity of substrates, (2) the lack of electron acceptors such as free molecular oxygen or nitrate, and (3) production and accumulation of toxic metabolic wastes. There is no net increase in bacterial growth. Cellular growth is balanced by cellular death during endogenous phase of growth.
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