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From: Pranchalee (email@example.com)
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 bicarbonate) Thank you.
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.