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Process Design Implications due to Differences in Anaerobic COD Stabilization Models

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Two biological nutrient removal membrane bioreactor WWTPs were compared using Biowin with both the default stoichiometry & kinetics and with modified stoichiometry & kinetics to prevent hydrogen and methane production. The modified Biowin configuration was to better follow the standard International Water Association's Activated Sludge Model 2d which does not include H2 as a state variable.

The modified Biowin configuration predicted up to 17% higher oxygen requirement and up to 21% higher solids mass for the WWTP process designs considered. These differences can have important impacts on aeration and bioreactor sizing.

Biological process designers are responsible for all assumptions used in their design. The methodology discussed here allows process designers to assess the inherent assumptions regarding anaerobic COD stabilization in the model they are using.
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Document Type: Research Article

Publication date: 2008-01-01

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