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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.
Nitrate in drinking water: health effects. Nitrate is one of the most frequent groundwater pollutants in rural areas. It needs to be regulated in drinking water basically because excess levels can cause methaemoglobinaemia, or blue baby disease.itrate drinking water standards Nitrate in drinking water is measured either in terms of the amount of nitrogen present or in terms of both nitrogen and oxygen.