Lesson 1 - Overview of Wastewater Treatment


Collection systems; Treatment facilities; Influent; Preliminary, primary, secondary, and tertiary treatment; Disinfection; Solids handling

Learning Objectives:
– List the purposes of wastewater treatment.
– Describe the way organic wastes pollute water.
– Identify elements of wastewater collection systems.
– Outline the stages of wastewater treatment at the typical treatment facility.
– Explain what happens to wastewater during preliminary, primary, secondary, and tertiary treatment.
– Describe methods of solids handling.

Lesson 2 - Physical Separation of Solids


Screening; Grinding; Grit removal; Sedimentation; Clarifiers; Air flotation; Filtration; Effluent disposal

Learning Objectives:
– Identify and describe the different types of bar and woven screens used for screening.
– Identify and describe common types of grit-removal equipment.
– List factors affecting settling rates.
– Figure the length of detention time needed to settle out settleable particles.
– Describe the three principal methods of land disposal.

Lesson 3 - Chemical Treatment Processes


Solids in wastewater; Chemical coagulants; Phosphate removal; Chemical clarification; Disinfection; Equipment used in chlorine feeding

Learning Objectives:
– Describe what colloidal particles are and outline the problems associated with removing them from wastewater.
– List chemicals used as coagulants.
– Explain how the flocculation process works.
– Explain the function of a precipitant.
– List chemical agents commonly used as disinfectants.
– Identify factors affecting disinfection.
– Describe methods for applying chlorine to wastewater.

Lesson 4 - Biological Processes


Lagoons; Activated sludge; Aeration; Trickling filters; Activated biofilter process; Rotating biological contactors; Secondary clarifiers

Learning Objectives:
– Differentiate between the way unaerated and aerated lagoons function.
– Distinguish between suspended growth and fixed-growth systems.
– List and describe different methods of utilizing activated sludge to stabilize wastewater.
– Tell how trickling filters, ABFs, and RBCs operate.
– Explain how secondary clarifiers are used in conjunction with fixed- and suspended-growth systems.

Lesson 5 - Solids Treatment and Disposal


Sludge conditioning; Thickening; Dewatering; Drying beds; Lagoons; Vacuum filtration; Filter presses; Composting; Ultimate disposal

Learning Objectives:
– Distinguish between conditioning, thickening, and dewatering.
– List the factors that affect which conditioning, thickening, and dewatering methods are used.
– Describe four methods of sludge conditioning.
– Describe three methods of thickening.
– List factors that affect drying-bed operation.
– Describe methods for disposing of digested or dewatered sludge.