Overview Flashcards
What were the benefits of the Clean Water Act of 1972?
Gave EPA authority to create measurable and enforceable standards for wastewater treatment and provided funding for new technology installation
Why treat wastewater?
To protect public health, the environment, and recreation
Total solids
All solida present in the wastewater, including suspended solids and dissolved solids as wel as inorganic and organic solids
Dissolved Solids
Solids in suspension that will pass through a filter
Suspended solids
Composed of settleable and nonsettleable solids
BOD (Biochemical Oxygen Demand)
A measurement of the oxygen needed to stabilize decomposing organic matter. Serves as food for microorganisms, used as a measure of the strength of organic waste in water.
COD (chemical oxygen demand)
A measure of oxygen-consuming capacity of organic matter in wastewater. Includes matter that bacteria may not stabilize, so it is not always related to BOD
Aerobic
Presence of free dissolved molecular O2
Anoxic
Lack of sufficient free dissolved molecular O2
Anaerobic
Absence of free dissolved molecular O2
Toxicity
Substances prohibiting biological activity or causing death
Facultative
Aerobic, anaerobic, or anoxic
Stages of Treatment
Preliminary treatment, primary treatment, secondary treatment, tertiary treatment, disinfection, and solids handling
Preliminary treatment overview
Removes rags and grit
Purpose of Primary treatment
Removes settleable solids, some TSS, BOD, and floatables
