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In secondary treatment, bacteria are added to the wastewater to ingest organic solids, producing secondary sludge that settles to the bottom. Tertiary treatment filters the water to remove whatever solids remain, disinfects it with chlorine, and removes the salt.
Public drinking water generallycomes to a treatment facility either from underground aquifers orfrom surface streams and reservoirs such as the one featured inthis video segment. Depending on the quality of the incoming rawwater, treatment facilities use a variety of processes to makethe water safe enough to drink. At the facility in Cambridge,Massachusetts, workers first add alum to the water.