Aerated Stabilization Basins

none scheduled at this time

ASB Workshop Outline

This 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

Registration Fee: $500 USD

Workshop Registration

Workshop Descriptions

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Activated Sludge Operations /Aerated Stabilization Basin Workshop Outline

This special workshop is a combination of the activated sludge workshop and the aerated stabilization basin workshop. Day 1 is devoted to activated sludge operations. Day 2 is devoted to common topics for both types of systems. Day 3 is devoted to ASB operations.

DAY 1 - Activated Sludge
Process Control and Monitoring Tests for Activated Sludge Operations

o Settlometer - measuring/assessing sludge settling characteristics
o Depth of blanket - determining clarifier inventory and sludge detention time
o Oxygen uptake - determining metabolic rate, detecting and managing toxicity, spills

Using the Microscope
o Floc Structure
o Filament Abundance
o Protozoa
o Other organisms

Secondary Clarifier Operation
o Controlling RAS flow - strategies (Clarifier Sludge Detention Time, Blanket Level, Inventory)
o Controlling WAS flow - strategies (MCRT, F/M. Inventory)
o Optimizing clarifier capacity

Process Control Management
o Monitoring AS plants
o Using Trend Charts
o Developing a Control Plan
o Plant Mass Balance Tracking

Class Exercises, Case Histories

DAY 2 - Activated Sludge and ASB
Overview of Wastewater Treatment
o Classification of Solids
o Treatment Steps - Preliminary, Primary, Biological, Sludge

Primary Clarifiers
o Assessing Performance
o Impacts on Secondary Treatment (positive, negative)

Biological Growth Pressures
o Organic Loading
o Hydraulics
o Temperature
o pH
o Oxygen
o Nutrients

Controlling Aeration
o Types of Aeration
o Oxygen Demand
o Impacts of Oxygen Deficiency
o D.O. Monitoring

Nutrient Management
o Types of Nutrients - nitrogen, phosphorus
o Nutrient Management - Overfeeding/Underfeeding
o Nitrification/Denitrification
o Control

Troubleshooting Sludge Settling Problems
o Non-Filamentous Problems
- Pin floc
- Dispersed Growth
- Straggler Floc
- Denitrification
- Slime Bulking
- Tetrads
- Foam
o Filamentous Problems
- Septicity (sulfides/organic acids)
- Low D.O.
- Low F/M
- Nutrient Deficiency
- Greases/Fats/Oils
o Short-Term Control
- Settling aids
- Hypochlorite/peroxide
o Long-Term Control
- Identify Cause
- Eliminate Cause

Overview of ASBs

o Layers
o Types - completely aerated, partially aerated, anaerobic
o Benthic Feedback

Using the Microscope
o Floc Structure
o Filament Abundance
o Protozoa
o Other organisms

Monitoring of ASBs
o Solids - TSS/VSS
o Nutrients
o Sludge Accumulation

Troubleshooting ASBs
o High Effluent BOD
o High Effluent TSS
o Foam
o High Effluent Ammonia
o Effluent Toxicity
o Sludge Accumulation

Class Exercises, Case Histories

Registration Fee: $500 USD for 2-day, $750 for all 3 days (AS and ASB)

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