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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.
Drinking Water. 3.1 Water Treatment. Suspended particulates that contribute to total organic carbon are generally removed during the pre-treatment step usually by a combination of coarse and fine screens, micro-strainers and/or simple gravity settling (National Health and Welfare 1993).