HACH LANGE RTC103 N-Module User Manual page 48

Parameterization and operation
4.9.2 SRT (MANUALLY)
4.9.3 DAILY SURPLUS MASS
4.9.4 COD-TKN RATIO
4.9.5 MIN NITRIFERS CONC.
4.9.6 MAX NITRIFERS CONC.
4.9.7 MODEL CORRECTION FACT.
4.9.8 SUBSTIT. DO FOR MODEL
4.9.9 NH4-N SETPOINT
4.9.10 P FAKT NH4 (only if NH
control)
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Manual input for the Sludge Retention Time (SRT [d]).
In case of a failing TSS signal, this is also used as fallback value.
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.
This is the assumed COD / TKN ratio. The RTC103 N-Module
considers a certain COD-related amount of NH
incorporated in the bio mass, reducing the amount of NH
nitrified.
Based on the amount of NH
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.
Based on the amount of NH
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.
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).
If there is a failure in the input signals (NH
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.
Desired set point of the NH
-N measurement in effluent is available for feed back
4
Proportional factor for the PD closed loop controller for the NH
concentration effluent aeration.
-N to be
4
-N nitrified during the last SRT, the
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-N nitrified during the last SRT, the
4
-N, TSS, Flow) and
4
-N concentration effluent aeration.
4
-N to be
4
-N
4