Patent ID: 8764986

Claim:
A system for removal of undesirable substances from a body of liquid, comprising: an aeration structure constructed of a pipe having a continuously inclined surface configured to provide an interaction of air bubbles against substantially an entire length of the continuously inclined surface while moving toward a top of the body of liquid, the continuously inclined surface being substantially submerged in the body of liquid; a bio-film of bacteria disposed on the continuously inclined surface; a high surface area-to-volume structure located within the pipe upon which a bio-film of bacteria can be formed; an aeration system, couplable to an air supply system, configured to release the air bubbles toward a bottom of the continuously inclined surface, such that the air bubbles move along the continuously inclined surface and the high surface-to-volume structure as the air bubbles rise so as to (i) create a variety of aerobic-anaerobic conditions for the bio-film and (ii) create a bottom-to-top circulation pattern to provide selective air mixing to support a micro climate for the bio-film on exposed surfaces.