lit à forte charge

CONT: In the high-rate filter the rate of feed has been increased, the recirculation ratio increased and the loading per unit of filter media has been stepped up.
CONT: High-rate filters are dosed with a much heavier organic loading per unit of media than is the low-rate filter (...)
OBS: (...) the effluent from the [high-rate] filter is normally mixed with the raw sewage and returned to the filter for additional treatment. (...) Returning all or a portion of the filter effluent is called recirculation and is a characteristic of the high-rate filter system.

OBS: Aunque la palabra ""filtro"" no es correcta ya que no se efectúa ninguna acción coladora ni filtrante, se utiliza más ""filtro"" que ""lecho"".