HACH LANGE RTC103 N-Module, User Manual

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Parameterization and operation
4.4.1 1-Channel RTC103 N-Module
RTC MODULES / PROGNOSYS
RTC MODULES
RTC
CONFIGURE
SELECT SENSOR
Selection list of available, relevant sensors for the RTC module in
the sc network (refer to
4.6 Select sensors on page 45 ).
N CONTROL
SRT MODE
Three different types of operation regarding the aerobic Sludge
Retention Time (SRT) can be selected:
• Manually : The SRT is provided as a manual input to the
controller
• SRT-RTC : The SRT is provided by a separate SRT-RTC and
forwarded to the RTC103 N-Module
• TSS mL : The SRT is calculated based on the TSS
concentration and the amount of TSS daily removed.
SRT (MANUALLY) Manual input for the SRT (also used as fallback value) [days]
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.
[kg/d]
COD-TKN RATIO
This is the assumed COD / TKN ratio. The N-RTC considers a
certain COD-related amount of NH4-N to be incorporated in the bio
mass, reducing the amount of NH4-N to be nitrified.
MIN NITRIFERS CONC.
Based on the amount of NH4-N nitrified during the last SRT, the
N-RTC 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.
[%]
MAX NITRIFERS CONC.
Based on the amount of NH4-N nitrified during the last SRT, the
N-RTC 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.
]%]
MODEL CORRECTION FACT.
This factor can be used to fine tune the DO concentration calculated
by the model (feed forward part of the N-RTC).
SUBSTIT. DO FOR MODEL
If there is a failure in any of the input signals (NH4-N, TSS, Flow) the
N-RTC will apply this DO feed forward set point for all further
calculations.
[mg/L]
NH4-N SETPOINT Desired set point of the NH4-N concentration effluent aeration. [mg/L]