Upflow continuous backwash filter

摘要: An upflow continuous backwash deep bed sand filter (UCBF) (100) having a recycle line (180, 170, 167) for returning carbonaceous denitrifying bacteria attached to biomass the influent of UCBF (100). The returns treatment process at location upstream Further, liquid level control unit (130) is provided that reduces fluctuations and significant drop in (144) (100), thereby avoiding or minimizing flow turbulences, air induction, undesirable wastewater aeration resulting need dose excessive carbon source remove dissolved oxygen aerated wastewater.