Description;Measurements and settings on a lab-scale MBR operated by BIOMATH;
Document;http://lib.ugent.be/catalog/rug01:001216253;

Data name;Description;Sensor,Transmitter;Remark;
Real Time;Time in string format;-;-;
Time (s);Timestamp of LabVIEW system time (reference 12:00 AM, January 1, 1904);-;-;
Aerobic(1)-anoxic m(0),r(-1) phase;Indicator of the bioreactor phase;-;-;
Phase of Membrane;Indicator of membrane phase;-;-;
Temperature (C);Temperature sensor (included in ORP sensor);Kemotron 9222, Knick Stratos 2402;Used for manual control of cooling setpoint;
pHan (-);pH sensor in anaerobic zone;METTLER TOLEDO Inpro4250, Knick stratos-E 2402 pH;Not frequently calibrated*;
pHa (-);pH sensor in aerobic/anoxic zone;METTLER TOLEDO Inpro4250, Knick stratos-E 2402 pH;Not frequently calibrated*;
DO (mg/l);DO sensor in aerobic zone;METTLER TOLEDO InPro6050, Knick stratos-E 2402 oxygen;Not frequently cleaned and/or calibrated*;
Reactor level (cm);Pressure sensor at the bottom of the bioreactor;142PC02D,Honeywell;Measurement of flux control loop;
PS2 (KPa);Pressure sensor at the feed side;142PC15D, Honeywell;-;
PS3 (KPa);Pressure sensor at the concentrate side;142PC15D, Honeywell;-;
PS4 (KPa);Pressure sensor at the permeate side;143PC15D, Honeywell;-;
Controlled flux value (L/m2h);Actuator value from the level controller**;-;Setpoint calculated from reactor level sensor;

Fixed settings name;Description;Value;
Total influent cycle duration (s);Total time of influent intake;180;
DO probe time constant UP (s)***;Time lag during rising DO concentrations;10;
DO probe time constant DOWN (s)***;Time lag during dropping DO concentrations;20;
Influent rate P1 (ml/min);Pump speed of P1;75;
Inter-bioreactor recirculation rate P2 (mL/min);Pump speed of P2;600;
Bioreactor to membrane recirculation rate P3 (mL/min);Pump speed of P3;375;
Membrane surface area (m2);Membrane surface area;0.17;
Membrane cross-section area (m2);Membrane cross-section area (calculated);0.00025485;
Design crossflow liquid (m/s);Pump speed of P4;0.5;
Design crossflow air (m/s)****;Flow through V5;0.5;

Variable settings name;Description;Control info;
Real Time;Time in string format;-;
Influent concentrate duration (s);Time of concentrate intake;Controls V1;
Aerobic Phase duration (min);Time of V4 on, V3 intern;Controls V3, V4;
Total Anoxic phase duration ( min);Time of V4 off, V3 intern;Controls V3, V4;
Anoxic Recirculation duration  (min);Time of V4 off, V3 return loop;Controls V3, V4;
Sludge Waste duration (s);Opening duration of sludge waste valve, during last moments of aerobic phase;Controls V2;
DO Set Point (mg/l);Setpoint of DO control loop;Controls V4;
DO bound (mg/l);Setpoint dead band for DO on/off control;Controls V4;
Set point of reactor level (cm);Setpoint of reactor level control loop;Controls P5*****;
Manual flux setpoint (L/m2h);Setpoint of flux;Controls P5******;
BW Flux (L/m2h);Setpoint of backwash flux;Sets P5;
Slope of P4;Slope of P4 calibration curve;-;
Intercept of P4;Intercept of P4 calibration curve;-;
Slope of P5;Slope of P5 calibration curve;-;
Intercept of P5;Intercept of P4 calibration curve;-;
Filtration Duration (s);Duration of filtration time;Controls V6, V7 and P5;
BW Duration (s);Duration of backwash time;Controls V6, V7 and P5;
Relaxation2 Duration (s);Duration of pump rest after backwash;Controls V6, V7 and P5;

Remarks
* Can be seen from the data as sudden jumps in these sensor data.;
** This is not a measument, but is the actuator value that the reactor level control is giving for the flux. This can only vary in a limited range from the manual setpoint.;
*** Time constants as described in Philichi T.L. and Stenstrom M.K. (1989). Effects of dissolved oxygen probe lag on oxygen transfer parameter estimation, J. WPCF, 51 (1): 83 – 86.;
**** Design value of crossflow was not respected at all times, due to manual changes in aeration flow.;
***** Level control by controlling filtration flux. The reactor level fluctuates when influent and effluent flow are different. The level also fluctuates due to wastage. The level control is automated but has often been reinitialized manually.;
****** Manual setpoint (expected long-term mean value) arround which the controlled flux value can vary.;