Introduction
In this chapter a cost-based integrated design approach is presented. Apart from the aeration tank, the design procedure also includes the other main treatment units of the activated sludge system: final settler, sludge thickener, sludge digester and optionally pre-treatment units such as the primary settler and the UASB reactor. Various detailed examples will demonstrate the use of this design approach in a step-by-step determination of the optimal configuration of the activated sludge system.
The theory presented in this book can also be applied to the operation of existing systems, to ensure that the desired effluent criteria are met at minimum costs and under conditions of good operational stability. In many cases, existing activated sludge systems are considerably overdesigned when compared to the actual daily applied flow and load. This may be caused by the necessity to take into account peak organic and hydraulic loads, or by a conservative design including safety margins, as there is uncertainty both with regard to expected loadings and to equipment performance. Some practical examples dealing with this subject will be discussed later. Click here to download the introduction of this section. In this section the following subjects will be discussed:
- Factors to consider in any wastewater engineering project: the basis of design, costing of the wastewater treatment plant, performance objectives, selection of most applicable treatment option and limitations & constraints
- Application of the integrated cost-based design procedure in selected examples of design and operation
Contents of this section
Integrated cost-based design and operation
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We regret that the design examples "A2 - Conventional secondary treatment with primary settling" and "A3 - Anaerobic pre-treatment with aerobic post-treatment (nitrification)", as well as several examples of operational optimisation are not available as a free online resource. If you want to know more, please purchase the handbook. More info ? |
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