This book is titled Physical-Chemical Treatment of Water and Wastewater. This chapter begins by defining wastewater and physical-chemical treatment of water and wastewater and treats briefly the coverage. It also addresses the unit operations and unit processes. In addition, in the environmental engineering field, construction of water and wastewater treatment plants and the requirements of their levels of performance are mostly driven by government laws and regulations. For example, the Clean Water Act mandates construction of wastewater treatment facilities that, at least, must produce the secondary level of treatment. The Safe Water Drinking Water Act also requires performance of treatment plants that produce drinking water of quality free from harmful chemicals and pathogens. For these reasons, the Clean Water Act and the Safe Drinking Water Act are discussed at length, detailing their developments and historical perspectives.

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