1. (a) A submerged biological contactor (SBC) system must be air driven and does not require a cover.

2. (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. (1) Each SBC unit must include two air headers, one for rotation of the unit and one to provide dissolved oxygen for the biological activity.
   2. (2) The submerged bearings must be sealed to prevent intrusion of the wastewater.
3. (c) If lubrication is required, an SBC unit 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.