PartV

Part IV presents the fundamental principles of ideal attached growth reactors and their application to packed towers, rotating disk reactors, and fluidized bed reactors. In Part V, those principles are applied to the practical design and operation of a variety of attached growth reactors. Chapter 19 addresses the design of trickling filters, the principal packed tower used in practice. Chapter 20 addresses rotating biological contactors, the principal rotating disk reactor used in practice. Both have been widely used in practice for removal of biodegradable organic matter, combined carbon oxidation and nitrification, and separate stage nitrification. Finally, Chapter 21 addresses a variety of submerged fixed film reactors that have undergone various degrees of development and application in practice. These include downflow and upflow packed bed reactors, fluidized bed reactors, and combined suspended and attached growth reactors. They have been used for removal of biodegradable organic matter, combined carbon oxidation and nitrification, separate stage nitrification, and denitrification using both the carbon in the wastewater itself and supplemental carbon (such as methanol). As in Part III, several process design approaches are presented, representing diverse degrees of sophistication and information requirements. The reader is referred to Chapter 9 for discussions of the iterative nature of biological process design and the need for a variety of design procedures.