SUBJECT: Enhance ammonia removal under shock loading conditions – Petroleum Refining WWTP
PRODUCT: Formula 150 – nitrifier bacterial blend
SYSTEM OVERVIEW: DAF->Caustic addition -> Complete Mix Activated Sludge System-> 2-Secondary clarifiers (D=140’; SWD = 12’)

  • Two separate treatment trains
  • Each aeration basin, 5.4 MG
  • MLSS = 3,000 – 4,000 mg/l
TREATMENT OBJECTIVE: To faciliate the recovery of ammonia removal in this large refinery WWTP. Ammonia spills in the process had resulted in excessive influent ammonia loading to the activated sludge basins with subsequent breakthrough into the effluent.
TREATMENT PROGRAM: Formula 150 was applied to the activated sludge basins as follows:

  • Day 1 = 500 lbs./day
  • Days 2 – 11 = 100 lbs./day
  • Days 12 – 60 = 20 lbs./day
*Adjustment of the influent pH to 9.5 was recommended to increase the pH in the aeration basins.