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From: Javier Climent (firstname.lastname@example.org)
Hello ASIM Community, I am using ASIM_orig model to validate my own model. I have several problems with results from rho9 and rho10, that is, Hydrolysis of entrapped organic nitrogen process adapted from Henze et.al to ASIM. I would like to communicate my doubt using these two expressions as follows: Here we have the expression 1, two terms from Hydrolisis of Henze model which should appear in rho9 and rho 10 of ASIM_orig: TERM 1 * TERM 2 (Xs/Xbh) / [Kx + (Xs/Xbh)] * Xnd/Xs = expression 1 They are implemented together in ASIM by means of the following Adsorption Process located in Kinetics of Part. Species as: *(X1 /X2 ) / (Kx + (X1/ X2 )) or *(Xnd /Xbh ) / (Kx + (Xnd/ Xbh )) = expression 2 The expression 1 and the expression 2 should be the same but they don't; so I would like to ask you the reason they are implemented in this way (two terms simplified in one Adsorption term). Thank you in advance Regards
For clarification: In the original ASM1 the process of hydrolysis of X_S and X_ND are separate processes and are processes number 7 and 8, respectively. Your question is about the hydrolysis of X_ND and not of X_S where in ASM1 rho_8 = rho_7 * X_ND/X_S. If you multiply (Xs/Xbh) / [Kx + (Xs/Xbh) by X_ND/X_S then you have a adsorption saturation expression in terms of X_ND/X_BH. This is what is implemented in ASIM. Note that the value of K_X must be adjusted depending on whether you choose the direct saturation with X_ND/X_BH or whether you follow the ASM1 description. I hope this helps. Best, Eberhard.