Mathematics of Complete-Mixing Activated Sludge
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VIEW THE REPLYPublication: Transactions of the American Society of Civil Engineers
Volume 128, Issue 3
Abstract
The complete-mixing activated-sludge process has been shown to have definite advantages over the conventional activated-sludge process for treating liquid wastes, especially industrial wastes. There are three basic complete-mixing systems: (1) Aeration only, (2) excess sludge in effluent, and (3) separate sludge wasting. Mathematical equations are presented to permit complete evaluation of the three systems. The mathematical equations contain various constants that have been evaluated on the basis of existing data.
Examples are presented for each system to show how the data obtained can be used in the design of the various systems. The aeration-only system is being used in aerated lagoons that are finding use in the treatment of domestic sewage as well as industrial wastes. The excess sludge in the effluent system is the basis for the extended-aeration activated-sludge systems being used for treatment of domestic sewage in small subdivisions, as well as for small industries. The separate sludge-wasting system approaches the conventional activated-sludge system, but offers definite economic and operational advantages over the conventional process.
Theoretical relationships and field operations have confirmed that with the complete-mixing activated-sludge process it is possible to take a waste of any organic strength and produce an effluent of any organic strength in a single stage unit when the unit is properly designed.
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Published In
Transactions of the American Society of Civil Engineers
Volume 128 • Issue 3 • January 1963
Pages: 497 - 524
Copyright
© 1963 American Society of Civil Engineers.
History
Published in print: Jan 1963
Published online: Feb 10, 2021
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