Applications Suspended Growth Reactors

Part I presents the fundamental principles upon which the design and evaluation of the biochemical operations used in wastewater treatment systems are based. These principles are then applied in Part II to the modeling of ideal suspended growth bioreactors. In Part III, we apply these principles to the practical design and operation of suspended growth biological wastewater treatment systems. Chapter 9 provides an overview of the design and evaluation of these systems, whereas the remaining chapters address specific suspended growth applications. Chapter 10 describes the design of activated sludge systems for the removal of biodegradable organic matter, the stabilization of particulate organic matter, and the oxidation of ammonia-N. The use of aerobic selectors to control the growth of certain types of filamentous bacteria is also considered. Chapter 11 addresses the design and operation of suspended growth biological nutrient removal systems. Single-sludge nitrogen removal, phosphorus removal, and combined nitrogen and phosphorus removal systems are considered, along with separate stage denitrification systems. The use of anoxic and anaerobic zones to control solids settleability is also addressed. The use of aerobic-digestion to stabilize the waste solids (both primary and secondary) produced in the liquid process train of a wastewater treatment plant is the topic of Chapter 12. Conventional aerobic digestion systems are considered, along with anoxic/aerobic digestion systems and autothermal thermophilic aerobic digesters. Chapter 13 addresses the use of anaerobic processes for the treatment of high strength wastewaters and sludges. Both suspended growth and combined suspended and attached growth processes are considered. Finally, pond and lagoon systems are considered in Chapter 14. The environments in these systems are complex and deviate more than the environments in the other named biochemical operations from the ideal reactors considered in Part II. In spite of that, the fundamental principles developed in Parts I and II of this book can be applied to their design and operation.

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