ASIM User Forum - [Can ASIM result pH of water. ]

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From: Pranchalee (
Date: 03/14/2016

Dear all
I have some question related to ASIM 5 model. Is it possible
to calculate pH 
of water from its alkalinity. I mean can I use alkalinity
(gathered from 
ASIM) to calculate pH of water (without concentration of

Thank you.

Reply #1
From: Eberhard Morgenroth (
Date: 03/19/2016
You have to differentiate between ASIM (the software) and
the activated sludge models (ASM: Henze, M. (2000) The
Activated Sludge Models (1, 2, 2d, and 3), IWA Scientific &
Technical Report, IWA Publishing, London, U.K.). 

The ASM do not have enough state variables that allow to
calculate pH. There is no way to translate the alkalinity
into pH. But in principle the models could be extended so
that pH can then be modeled. 

See for example: Batstone, D.J., Amerlinck, Y., Ekama, G.,
Goel, R., Grau, P., Johnson, B., Kaya, I., Steyer, J.-P.,
Tait, S., Takacs, I., Vanrolleghem, P.A., Brouckaert, C.J.
and Volcke, E. (2012) Towards a generalized physicochemical
framework. Water Science and Technology 66(6), 1147-1161.

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