There are many other biochemical operations in use or development. Among those are the hybrid systems, such as the activated biofilter, which combine the attributes of suspended and attached growth bioreactors. Even though these systems are not listed in Tables 1.1 and 1.2, they are covered at appropriate points. However, many other new biochemical operations are not included in this book due to space constraints. Their exclusion should not be construed as a bias against their use. Rather, it is felt that once the fundamental principles of biochemical operations are learned, the reader will be able to apply them to understand and evaluate any biochemical wastewater treatment system.
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