Hach-Lange RTC113 ST-Module - Manual (Page 28)

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Parameterization and operation
4.6 PRESELECT PROG
4.6.1 POLYMER DOSING CONTROL
Based on the measured feed flow rate [m³/h] and the measured
TSS concentration [g/L] from the influent, the polymer dosing rate
[L/h] is calculated such that the setpoint corresponds to the
specific polymer dosing rate [g/kg].
Note: This open-loop control mode can only be activated if FEED FLOW
CONTROL is deactivated.
Note: The polymer flow rate is controlled via the RTC.
4.6.2 FEED FLOW CONTROL
Based on the measured TSS concentration [g/L] and the
specified polymer dosing rate [L/h], the feed flow rate is
calculated such that it corresponds with the specific polymer
dosing rate [g/kg] (FACTOR POLYMER DOSING).
Note: This open-loop control mode can only be activated if POLYMER
DOSING CONTROL is deactivated.
Note: The feed flow rate is controlled via the RTC.
4.6.3 CLOSED LOOP EFFLUENT CONTROL
If activated, the specific polymer dosing rate FACTOR POLYMER
DOSING is adjusted based on the difference between the target
and actual TSS concentration in the thickened sludge.
If FEED FLOW CONTROL is activated, the TSS load fed with the
sludge thickening is adjusted based on the difference between
the target and actual TSS concentration in the filtrate.
Note: This closed-loop control can only be activated if POLYMER
DOSING CONTROL ( section 4.6.1 ) or FEED FLOW CONTROL
( section 4.6.2 ) is activated.
4.7 CONTROL PARAMETER
4.7.1 FACTOR POLYMER DOSING
Required specific polymer dosing [g/kg]. This parameter
determines how many grams of polymer per kilogram of TSS are
fed by the machine.
4.7.2 POLYMER CONCENTRATION
Polymer concentration [g/L] fed via the polymer pump.