Hach-Lange RTC103 N-Module - Manual (Page 48)

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Parameterization and operation
4.9.2 SRT (MANUALLY)
Manual input for the Sludge Retention Time (SRT [d]).
In case of a failing TSS signal, this is also used as fallback value.
4.9.3 DAILY SURPLUS MASS
The amount of sludge daily removed from the process. Based on
that amount, the MLSS concentration in the aeration tank and the
aerated volume the SRT is calculated.
4.9.4 COD-TKN RATIO
This is the assumed COD / TKN ratio. The RTC103 N-Module
considers a certain COD-related amount of NH
4
-N to be
incorporated in the bio mass, reducing the amount of NH
4
-N to be
nitrified.
4.9.5 MIN NITRIFERS CONC.
Based on the amount of NH
4
-N nitrified during the last SRT, the
RTC103 N-Module calculates the concentration of nitrifiers in the
activated sludge. This concentration is required to determine the
DO set point. If the calculated concentration is lower than the MIN
NITRIFERS CONC., the MIN NITRIFERS CONC. will be used to
determine the DO set point.
4.9.6 MAX NITRIFERS CONC.
Based on the amount of NH
4
-N nitrified during the last SRT, the
RTC103 N-Module calculates the concentration of nitrifiers in the
activated sludge. This concentration is required to determine the
DO set point. If the calculated concentration is higher than the
MAX NITRIFERS CONC., the MAX NITRIFERS CONC.. will be
used to determine the DO set point.
4.9.7 MODEL CORRECTION FACT.
This factor can be used on order to fine tune the DO
concentration calculated by the model (feed forward part of the
RTC103 N-Module).
4.9.8 SUBSTIT. DO FOR MODEL
If there is a failure in the input signals (NH
4
-N, TSS, Flow) and
the RTC103 N-Module is not able to calculate the required DO
concentration, the RTC103 N-Module will apply this DO feed
forward set point for all further calculation.
4.9.9 NH4-N SETPOINT
Desired set point of the NH
4
-N concentration effluent aeration.
4.9.10 P FAKT NH4 (only if NH
4
-N measurement in effluent is available for feed back
control)
Proportional factor for the PD closed loop controller for the NH
4
-N
concentration effluent aeration.