- (a) A submerged biological contactor (SBC) must be air driven and does not require a cover. An SBC is any biological contactor where more than 60% of the surface is below the water level at design flow.
(b) An SBC system requires the same pretreatment as a rotating biological contactor system and must meet the criteria in §217.185 of this title (relating to Rotating Biological Contactors), except as described in paragraphs (1) and (2) of this subsection.
- (1) Each SBC unit must include two air headers - one to provide rotation of the unit, and one to provide dissolved oxygen for biological activity.
- (2) Submerged bearings must be sealed to prevent intrusion of wastewater.
- (c) If an SBC has any moving parts that require lubrication, an SBC must have lubrication access above the water level.
Source Note:The provisions of this §217.188 adopted to be effective August 28, 2008, 33 TexReg 6843; amended to be effective December 4, 2015, 40 TexReg 8254.