Bio-trickling filter

Attached growth processes Wastewater treatment processes in which the microorganisms and bacteria treating the wastes are attached to the media in the reactor. The wastes being treated flow over the media. Trickling filters, bio-towers, and RBCs are attached growth reactors. These reactors can be used for removal of BOD, nitrification, and denitrification. 

Trickling filter An attached culture,wastewater treatment system. A large tank generally filled with rock or rings (see Bio-Tower). Wastewater is sprayed over the top of the media, providing the opportunity for the formation of slimes or biomass to remove wastes from the wastewater, through revolving arms which have spray nozzles. Water is pumped from the bottom of a trickle filter to a secondary clarifier. 

In a study of the removal of 16 FMs from wastewater, Simonich et al. [11] conducted their studies at 17 wastewater treatment plants with plant flows of 1.4x106-1.0x108 L day-1. Twelve of the plants were located in different states and regions of the U.S. and five plants were located in Europe. In addition, five of the 17 plants were activated sludge plants, two were carousel plants, two were oxidation ditch plants, five were trickling filter plants, one was a rotating bio-... 

The trickling filter process, including conventional rate filters, multiple-stage, high-rate systems, and bio-oxidation roughing towers. 

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