1. A system for a treatment process of wastewater comprising: a reactor unit having a volume, a plurality of sub-volumes within the reactor unit having at least one of (i) one or more mixing devices, or (ii) one or more of aerators, wherein at least one of the plurality of sub-volumes constitutes a flexible environment configured to dynamically transition some or all of that sub-volume between two or more of anaerobic, anoxic, fermentation, suboxic, and aerobic environments, and wherein the flexible environment is not bounded by any physical barriers and comprises (i) the one or more mixing devices and (ii) the one or more aerators, wherein the one or more of the plurality of mixing devices and the one or more aerators in the flexible environment are arranged in an overlapping proximity to permit providing coinciding mixing and aeration, respectively, to the wastewater within the flexible environment; and one or more controllers for controlling the one or more mixing devices and the one or more aerators, wherein the one or more controllers selectively and independently controlling the one or more mixing devices within the flexible environment and selectively and independently controlling the one or more aerators within the flexible environment.