Hello,
I use WEST 2014; in ASM1_AN, K_NH3_NH is expressed in gNH3-N/m3, infact in the expression of the aerobic growth of AOB, it is converted to N-NH4+.
The default value of K_NH3_NH (expressed in gNH3-N/m3) is 0.75; this value, according to the Anthonisen equation for the conversion to ammonia nitrogen, is approximately equal to 48 gNH4-N/m3 (at Temperature = 20 ° C and pH = 7.5); it is a very high value for half-saturation constant for ammonia oxidation! Instead, in ASM1, K_NH seems to be expressed as N-NH4+, infact in the expression of the aerobic growth of AOB, there is not a conversion to N-NH4+; however, in Block Details the unit of measurement is gNH3-N/m3; is this an error? The default value of K_NH in ASM1 is 1; this value, expressed in gN-NH4+/m3 is consistent with the ammonia oxidation process.
Thank you,
Iacopo
