MBR and Sludge glossary (R)

RBC
Rotating biological contactor

Recirculating bed reactor RBR
Reactor configuration based on a recirculating media bed, usually sand

Recycle ratio
Ratio of the recycle flow rate to influent sludge flow rate in a dissolved air flotation process

Redox
Reduction-oxidation

Residence or retention time
Period of time the solids or liquid are retained in the reactor

Resource recovery rate
Rate at which an embedded sludge resource (water, nutrients, biogas, etc) is recovered

Return liquors
Liquid stream from anaerobic digestion or sludge solid−liquid separation process returned to the wastewater treatment works inlet

RO
Reverse osmosis

Rotary drum thickening RDT
Sludge consolidation by allowing water to drain through a porous rotating drum

Rotary dryer
See rotating drum dryer

Rotary press RP
Dewatering technology based on a cylindrical vessel housing two slowly-rotating circular screens which are sandwiched together

Rotating cone reactor RCR
Reactor configuration used for fast pyrolysis based on a rotating cone

Rotating drum dryer
Convective dryer based on a rotating drum through which hot air passes axially to dry the sludge particles