Following completion of Chapter 7, students should be able to:

1. Explain how an enhanced biological treatment system can be used to improve biological treatment process control and performance.
2. Set priorities when more than one treatment objective must be met.
3. Operate and maintain enhanced nitrogen and phosphorus removal systems.
4. Operate and maintain enhanced SVI control to prevent sludge bulking.
5. Operate and maintain the Bardenpho process.
6. Review plans and specifications for an enhanced biological treatment system.

The purpose of this chapter is to show students how various modifications of the activated sludge process can be used to remove nitrogen and phosphorus from wastewaters and to enhance overall treatment results. The chapter also explains how to set priorities when it is necessary to accomplish more than one objective with a biological treatment system. System flexibility is an important consideration in enhanced biological treatment; therefore, this chapter presents an extensive review of the factors that should be considered when reviewing plans and specifications for such a system.

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