role do biofilms play in trickling filters? Transcribed Image Text: 2 Rotating arm Distributes liquid waste Filter media Biofilm-coated plastic pieces or coarse gravel and rocks Liquid waste trickles through

role do biofilms play in trickling filters? Transcribed Image Text: 2 Rotating arm
Distributes liquid waste
Filter media
Biofilm-coated plastic pieces
or coarse gravel and rocks
Liquid waste trickles
through
5 Outlet pipe
Liquid waste from the filter goes to
a sedimentation tank before
1 Inlet pipe
Liquid waste from primary
treatment enters
advanced treatment or disinfection
FIGURE 29.2 Trickling Filter Wastewater is channeled into the
rotating arm, and then trickles through holes in the bottom of the arm
onto plastic or a gravel and rock bed.

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