Marshall Environmental Training and Consulting Group, Inc., (METC Group)

Aerated Stabilization Basin Operations Training Course


This 2-day course is for operators, technicians, engineers and managers of aerated stabilization basins. Biological treatment concepts for ASBs will be reviewed. Effluent treatment plant microbiology (filamentous and non-filamentous) will be related to ASB performance. Management and operation of the key control elements for ASBs will be discussed. It is operations oriented providing practical information for day-to-day operation. Attendees will participate presenting their operational approaches to various topics such as nutrients, aeration and basin sludge removal.

Review of Wastewater Treatment

  • Composition of Wastewater - types of solids, organics
  • Preliminary Treatment - screening, equalization
  • Primary Treatment - settleable solids vs. suspended solids removal
  • Secondary Treatment - conversion of organics, solids capture

Primary Treatment

  • Solids Capture and Efficiency
  • Negative Impacts from Priamry on Secondary

Overview of Biological Treatment

  • ·Overview of ASB Processes
  • Bacterial growth - metabolism, respiration, growth phases
  • Growth Pressures: Temp., pH, dissolved oxygen, nutrients, toxics, hydraulic loading

Microscopic Evaluation of ASBs

  • Floc Structure
  • Filament Abundance
  • Protozoa and Other higher Life Forms

Aeration & Dissolved Oxygen Control

  • Types of Aeration
  • Monitoring, D.O. probes
  • Mixing
  • Causes of D.O. deficiency

Nitrogen & Phosphorus Management

  • Sources of nutrients, nutrient requirements
  • Monitoring residuals
  • Nutrient deficiency
  • Nitrification/denitrification

Managing ASB solids

  • Wastewater characteristics
  • ASB Design Impact on Solids
  • Sludge Removal and Reduction

Sludge Quality Problems & Control

  • Poor floc formation
  • Foaming
  • Toxicity
  • Filamentous bulking (low D.O., low F/M, nutrient deficiency, septic/sulfide)
  • Controlling bulking problems

ASB Troubleshooting

  • High Effluent BOD and TSS
  • Effluent toxicity
  • High Effluent ammonia
  • Foaming
  • Rapid Sludge Accumulation

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