Understand that urban lifestyles and industrial processes generate substantial amounts of waste water that must be treated prior to environmental release.
Identify that sewage and agricultural waste water require the removal of organic matter and harmful microbes.
Identify that industrial waste water often requires the removal of both organic matter and harmful chemicals.
Describe the key stages of sewage treatment, including screening and grit removal, sedimentation to produce sewage sludge and effluent, anaerobic digestion of sewage sludge, and aerobic biological treatment of effluent.
Evaluate and comment on the relative ease and difficulty of obtaining potable water from various sources: waste water, ground water, and salt water.
