This paper considers the question of which is better; the batch or the continuous activated sludge processes? It is an important question because dissension still exists in the wastewater industry as toi the relative merits of each of the processes. A review of perceived differences in the processes from the point of view of two related disciplines process engineering and biotechnology, is presented together with the results of previous comparative studies. These reviews highlight possible areas where more understanding is required. This is provided in the paper by application of the flexibility index to two case studies. The flexibility index is a useful process design tool that measures the ability of the process to cope with long term changes in operation.

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