Which components constitute the essential sequence of modern wastewater treatment established between 1890 and 1915?
Answer
Preliminary screening, primary sedimentation, and secondary biological treatment
The period between 1890 and 1915 solidified the fundamental workflow for wastewater treatment plants that is still standard today. This sequence begins with preliminary screening to remove large physical objects and debris. This is followed by primary sedimentation, where the water is held in tanks to allow solid particles to settle to the bottom. Finally, the process moves to secondary biological treatment, where microorganisms are utilized to break down and oxidize the remaining dissolved organic pollutants.
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