The YSI IQ SensorNet 2020 XT is a water quality system for a complete sensor network. It's ideal for various installation needs. The modular system can accept additional sensors easily at any time. This is a powerful system to continuously measure water quality parameters anywhere in a facility for process control. Measure: Dissolved oxygen (optical or electrochemical) pH ORP Conductivity Temperature Turbidity - ultrasonic cleaning TSS (total suspended solids) - ultrasonic cleaning Ammonium Nitrate* Potassium COD (chemical oxygen demand) - ultrasonic cleaning TOC (total organic carbon) - ultrasonic cleaning DOC (dissolved organic carbon share of TOC) - ultrasonic cleaning SAC (spectral absorption coefficient) - ultrasonic cleaning BOD (biochemical oxygen demand) - ultrasonic cleaning UVT-254 Orthophosphate Immediate benefits include better network visibility and management, early detection of network failures, improved compliance with regulatory targets and cost savings (energy, pump/blower maintenance, labor).

1. Process Monitoring and Automation
of Water Resource Recovery
Facilities (WRRF)

2. What’s Inside?
• Online process monitoring instrumentation –
what’s new?
• Dissolved Oxygen measurement (optical)
• DO aeration control
• Nitrogen measurement (ISE)
• Ammonium based aeration control
• TSS
• SRT (Solids Retention Time) control
• Nitrogen, COD, phosphate

3. Online Process Monitoring Instrumentation
• Solid-state in-situ sensors
• Multiparameter universal controllers
• Digital communications
• Measurement
• New parameters – NH4, NOx
• New methods – DO, TSS
• Better performance
What’s new

4. Solid-State In-Situ Sensors
Signal processing in sensor
• Auto-recognition (plug & play)
• Calibration
• Multiple measurements
• Self-diagnostics

5. IQSN Sensors

6. Multiparameter, Universal Controllers
Brain of the system
• Up to 20 channels
• Measurement display
• Internal communications
• Operating functions

7. IQ SensorNet Controller Digital
Expandable Multi-location System
Model 2020XT: 1 – 20 parameters

8. Customized solutions,
happy customers…
Units are separated and encased
in standardized modules,
adaptable to local conditions
Power supply
Analog outputs / inputs
Interfaces
System extension
Controller in a module
Modules

9. Digital Communications
Enhanced signal stability
• Simultaneous and 2-way
communication
• Convenient placement of
components
• Large distances
• Less cabling
• RS-485, Modbus, profibus,
Ethernet IP, Modbus TCP/IP

10. Dissolved Oxygen
(Optical)

11. Optical insulation
Filter
Detector
Optical DO Sensor - FDO
Gas selective membrane
with fluorescence dye

12. Step 1: Excitation flash
Step 2: Fluorescence flash:
Starting time and intensity
depend on O2 concentration
Oxygen Measurement

13. Oxygen Measurement
Time or intensity • Time
• Highly
accurate
• No
interferences
from ambient
light /
bleaching
• Check: some
signal must
be detected

14. Effect of DO Concentration on Biological
Treatment
Basis for maintaining DO at or below 2 mg/L setpoint
D.O.  Reaction 
0.75
D.O.  : Reaction 
D.O. ~ 2 mg/l  sufficient for
nitrification
COD removal
Nitrification
0.5 1.0 2.01.5 2.5 3.0 O2 (mg/l)
1/2 vmax
vmax
Reactionrate
0.3

15. Automated DO Control Alternatives
• On-off
• Mixing required
• Never at setpoint
• Direct control of airflow
• Difficult control problem - DO vs. airflow non-linear

16. Cascade Control
Most effective / most complicated
PI

17. FDO 700 IQ

18. Optical DO Sensor

19. Intelligent Sensor Cap (Replaceable)
• Data stored on memory chip
• Automatic transfer of
calibration constants
Individual factory calibration

20. Interferences
Bubbles & coatings cause
overestimate and erratic
measurements

21. Interferences

22. Nitrogen Removal – The
Traditional Way

23. 1 mole Ammonia
(NH3 / NH4
+)
1 mole Nitrite
(NO2
-)
1 mole Nitrate
(NO3
-)
1 mole Nitrite
(NO2
-)
1/2 mole Nitrogen gas
(N2)
75% O2
25% O2
40% Carbon
60% Carbon
Nitrification /
Denitrification
Aerobic Anoxic

24. Ion Selective Measurement System

25. Nitrification - Denitrification
Pre denitrification (MLE) • Anoxic zones –
denitrification
• Oxic zones (DO
control) – nitrification
• Mixers to uncouple
aeration/mixing
(anoxic)
• Recirculation – IMLR
• Readily degradable C
– ww or methanol ($$)
• Sensors & control
system
Ingildsen, P, Wendelboe, H., “Improved nutrient removal results using in situ
continuous on-line sensors with reduced response time”, WEFTEC 2003

26. Ammonium-Based Aeration Control
Feedback control
• Direct control on ammonium
• DO not controlled at all
• Direct control w/ DO limit
(ceiling)
• DO changes faster –
control authority?
• Cascade control
• Ammonium controller
calculates DO setpoint

27. VARiON Plus 700 IQ, AmmoLyt Plus 700 IQ,
NitraLyt Plus 700 IQ - Nitrogen Measurement

28. VARiON® Plus 700 IQ
AmmoLyt® Plus 700 IQ
NitraLyt® Plus 700 IQ
ISE Sensors for Ammonium (NH4), Nitrate
(NO3)

29. ISE Sensor Design
Four individual electrodes
• NH4, NO3, K, Cl
• 1-yr. warranty
• Automatically recognized in
system

30. AmmoLyt Plus 700 IQ NitraLyt Plus 700 IQ
VARiON Plus 700 IQ
3 slots 3 slots
Sensor Types

31. Total Suspended Solids

32. Optical Measurement of Solids
Particles absorb, reflect, scatter light

33. Intensity
Turbidity / Suspended Solids
90° (DIN, ISO,
US EPA) < 90°
180° (or back
scatter)
Effect of Measuring Angle on Measuring
Range

34. 0.0
4.0
8.0
12.0
16.0
5 10 15 20 25
NitrificationSRT,dSRT (Solids Retention Time) Required for
Nitrification
Design SRT; SF=1.5
Operating Range
Change SRT by changing
wasting rate
Min. SRT
Temperature, °C

35. Approaches to SRT Control
Qe, Xe
V, MLSS
Qr, Xr Qw, Xr
Qi, Xi
SRT setpoint
Qw

36. Sensor Maintenance
Ultrasonic cleaning with
UltraClean technology &
sapphire windows
• No wipers
• No moving parts

37. without cleaning system (30 days) with cleaning system (30 days)
UltraClean Ultrasonic Cleaning

38. Nitritation - Anammox

39. 1 mole Ammonia
(NH3 / NH4
+)
1 mole Nitrite
(NO2
-)
1 mole Nitrate
(NO3
-)
1 mole Nitrite
(NO2
-)
1/2 mole Nitrogen gas
(N2)
75% O2
25% O2
40% Carbon
60% Carbon
Aerobic Anoxic
Anaerobic

40. 1 mole Ammonia
(NH3 / NH4
+)
1 mole Nitrite
(NO2
-)
1 mole Nitrate
(NO3
-)
1/2 mole Nitrogen gas
(N2)
Aerobic Anoxic
Deammonification
Anaerobic
37.5% O2

41. 2013 WEF/IWA Nutrient Removal &
Recovery Conference

42. UV Sensor – Principle of Measurement
• Absorbance depends on
• Concentration (what you are measuring)
• Optical path length (distance from lamp to detector)
• Transmission characteristics of sample (everything in
the water that absorbs or reflects light)
lamp detector
I0 I
Light gets absorbed
/ weakened by
sample
sample

43. What Different Wavelengths Tell You About
What is in the Sample
Measurement & compensation

44. Difference Between UV and UV-VIS Sensors
Measurement of NO2 and NO3
• 256 wavelengths measured
• 200 – 390 nm
• 0.74 nm resolution
wavelength [nm]

45. COD, TOC, BOD,
NO3-N, TSS mg/lmathematics
Calculation
• Measurement procedure
1. Record spectra
2. Calculate concentrations from model
Models stored in instrument

46. Deammonification
• Sidestream treatment (DEMON®
, MBBR)
• Mainstream treatment
Applications
46

47. CarboVis, NitraVis, NiCaVis, NiCaVis NI
UV-VIS and UV Spectral Measurement

48. 200 nm 720 nm
Immersible Spectrophotometer
256 wavelengths

49. Low Maintenance
Durable / low ownership cost
• Integrated UltraClean
ultrasonic cleaning
• Very hard, smooth sapphire
window
• No wipers
• Titanium / PEEK

50. • NitraVis: NOx, (TSS)
• CarboVis: SAC, CODtotal, CODsoluble, BOD, DOC, TOC,
(TSS)
• NiCaVis NI: NO3, NO2, SAC, CODtotal, CODsoluble, BOD,
DOC, TOC
• 200 nm to 390 nm (UV only)
• Measuring gap
• 1 mm (high concentrations)
• 5 mm (low concentrations)
Sensor Types
Up to 5 parameters on one sensor

51. Phosphate

52. Chemical P Removal
• Effluent monitoring
• Feedback control
• Pre-precipitation
• Post-precipitation
• Feed forward control
• Feedback feed forward
P 700 IQ P 700 IQ P 700 IQ

53. Features
• Low reagent consumption
• Optional outdoor climate package
• Automatic calibration
• Integrated permeate pump
• Filter module

54. Application Example Chemical Dosing
Flocculating
agent
Phosphate
[mg/l]
time
Use of P700 IQ for regulation of
flocculating agent dosage

55. Resources
YSI.com/IQ
bit.ly/IQwin (win an IQ instrument)
bit.ly/IQanimation (IQ overview video)
bit.ly/IQfeatures (IQ features video)
bit.ly/IQcolorado (IQ installed in WWTP in Colorado)
blog.ysi.com/IQ-SensorNet (related blog posts about IQ)

57. Contact Us
+1 (937) 767-7241
(800) 765-4974
info@ysi.com
YSI.com
@YSIinc