Alaska Wastewater Treatment: Level 1-2 Biological Treatment & Solids Fundamentals
This guide bridges Alaska's entry-level WWT overview and its advanced biological-process/solids-handling guide, covering the preliminary/primary treatment operations and foundational solids concepts a Level 1/2 operator must know before tackling advanced process control.
Preliminary & Primary Treatment
Preliminary treatment (headworks) protects downstream equipment: bar screens (manual and mechanical) remove large debris, and grit chambers remove sand/gravel that would otherwise abrade pumps and settle in tanks. Know why grit removal design targets a specific velocity range — too fast and grit stays suspended, too slow and organic solids settle out with it. Primary clarifiers remove settleable solids and floatables via gravity settling before biological treatment; understand surface overflow rate (SO