Fill in the blanks using the following words: contaminants, wastewater, pretreatment, adverse, sedimentation, ultimate, bacteria. 1. Toxic wastes must receive … by the polluter prior to introduction into a water reservoir or municipal used-water return

Task 7. Fill in the blanks using the following words: contaminants, wastewater, pretreatment, adverse, sedimentation, ultimate, bacteria.
1. Toxic wastes must receive … by the polluter prior to introduction into a water reservoir or municipal used-water return lines.
2. Although pollutants may be minute, innumerable studies have shown their … effects on human and other animal life.
3. The final step is the … management of this treated material, or biosolids, which can be used beneficially through methods such as land application.
4. Screening removes large floating objects from the incoming … stream.
5. … tanks are designed to hold wastewater for several hours.
6. The major goal of secondary treatment is to biologically remove … that are dissolved in wastewater.
7. In secondary treatment, air is supplied to encourage the natural processes of growth of … and other biological organisms to consume most of the waste.