ABSTRACT
Distribution of Volume, Mixed Liquor Suspended Solids, and Oxygen in Nonuniform Systems. As indicated by guiding principle 4 in Table 9.1, the total mass of biomass and the total oxygen requirement in the various alternative activated sludge systems will all be essentially the same, provided they all have the same SRT. Thus, they can be calculated by the simple model of Chapter 5 as modified in Section 9.4.2. However, when the design involves the distribution of flows or volumes into reactors in series, the biomass and oxygen requirement must also be distributed appropriately. This can be done for the steady-state case by the application of mass balances and appropriate heuristics. Distribution of the transient-state oxygen requirement is more difficult. Because the procedures involved are unique to each activated sludge variation, they will be considered individually in the sections that follow.
