Suspended growth treatment systems freely suspend micro-organisms in water. They use biological treatment processes in which microorganisms are maintained in suspension within the liquid. In suspended growth treatment systems, microorganisms convert the organic matter or other constituents in the wastewater into gases and cell tissue. The most common type of aerobic system is the suspended growth treatment system. Aerobic suspended growth technologies are conventional activated sludge treatment systems that use various process modes ranging from: conventional, extended aeration, contact stabilization, sequencing batch, and single sludge.