Aerobic Wastewater Treatment
This refers to the removal of organic pollutants in wastewater by bacteria that require oxygen to work. Water carbondioxide is the end products of the aerobic wastewater treatment process. Processes include trickling filtration, activated sludge and rotating biological contactors. Some bacteria that thrive in oxygen-rich environment work to break down and digest the wastewater inside the treatment plant or system.
Anaerobic Wastewater Treatment
This is a process whereby bacteria digests biosolids in the absence of oxygen. One major feature of anaerobic digestion is the production of biogas, which can be used in generators for electricity production or boilers for heating process. This, plus the fact that aerobic wastewater treatment requires a method for the introduction of oxygen into the process, makes anaerobic wastewater treatment generally more cost effective.