Wastewater Engineering Treatment and Resource Recovery

Abstract

Since completion of the fourth edition of this textbook, the field of wastewater engineering has evolved at a rapid pace. Some of the more significant changes include: 1. A new view of wastewater as a source of energy, nutrients, and potable water. 2. More stringent discharge requirements related to nitrogen and phosphorus; 3. Enhanced understanding of the fundamental microbiology and physiology of the microorganisms responsible for the removal of nitrogen and phosphorus and other constituents; 4. An appreciation of the importance of the separate treatment of return flows with respect to meeting more stringent standards for nitrogen removal and opportunities for nutrient recovery, 5. Increased emphasis on the treatment of sludge and the management of biosolids; and 6. Increased awareness of carbon footprint impacts and greenhouse gas emissions, and an emphasis on the development of energy-neutral or energy-positive wastewater plants through more efficient use of chemical and heat energy in wastewater.