Unit processes comprise the components of a treatment train used to remove contaminants from water. An understanding of these processes provides the foundation for continued learning and for designing treatment systems. The principles of unit processes also apply to ambient environmental contexts, such as transport of groundwater contaminants and stream pollution. Unit process theory is one of the core areas of an environmental engineering curriculum, and is important for the design of water treatment systems. This text provides grounding in the underlying principles of unit processes in a...

In 1983 the author, a Christian Businessman, arrived home from a sales trip to discover that his wife and three children had been brutally murdered. A year later he was convicted and sent to prison. He was innocent. In prison he met Henry Hillenbrand, known as the card man because he sold homemade greeting cards. Henry told David an incredible story. In 1970, after murdering the woman he loved and the man he found her in bed with, he had executed a daring escape from jail by cutting through his cellblock's iron cage and the bars of a window and rappelling from the third floor with a rope he...