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Process Monitoring and Automation of Water Resource Recovery Facilities | IQ SensorNet | YSI
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Transcript of Process Monitoring and Automation of Water Resource Recovery Facilities | IQ SensorNet | YSI
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Process Monitoring and Automation of Water Resource Recovery
Facilities (WRRF)
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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
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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
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Solid-State In-Situ Sensors
Signal processing in sensor
• Auto-recognition (plug & play)
• Calibration
• Multiple measurements
• Self-diagnostics
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IQSN Sensors
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Multiparameter, Universal Controllers
Brain of the system
• Up to 20 channels
• Measurement display
• Internal communications
• Operating functions
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IQ SensorNet Controller Digital
Expandable Multi-location System
Model 2020XT: 1 – 20 parameters
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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
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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
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Dissolved Oxygen (Optical)
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Optical insulation
Filter
Detector
Optical DO Sensor - FDO
Gas selective membrane with fluorescence dye
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Step 1: Excitation flash
Step 2: Fluorescence flash: Starting time and intensity depend on O2 concentration
Oxygen Measurement
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Oxygen Measurement
Time or intensity • Time • Highly
accurate • No
interferences from ambient light / bleaching
• Check: some signal must be detected
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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 2.0 1.5 2.5 3.0 O2 (mg/l)
1/2 vmax
vmax
Rea
ctio
n ra
te
0.3
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Automated DO Control Alternatives
• On-off • Mixing required • Never at setpoint
• Direct control of airflow • Difficult control problem - DO vs. airflow non-linear
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Cascade Control
Most effective / most complicated
PI
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FDO 700 IQ
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Optical DO Sensor
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Intelligent Sensor Cap (Replaceable)
• Data stored on memory chip • Automatic transfer of
calibration constants
Individual factory calibration
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Interferences
Bubbles & coatings cause overestimate and erratic measurements
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Interferences
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Nitrogen Removal – The Traditional Way
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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
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Ion Selective Measurement System
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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
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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
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VARiON Plus 700 IQ, AmmoLyt Plus 700 IQ, NitraLyt Plus 700 IQ - Nitrogen Measurement
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VARiON® Plus 700 IQ AmmoLyt® Plus 700 IQ
NitraLyt® Plus 700 IQ
ISE Sensors for Ammonium (NH4), Nitrate (NO3)
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ISE Sensor Design
Four individual electrodes
• NH4, NO3, K, Cl • 1-yr. warranty • Automatically recognized in
system
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AmmoLyt Plus 700 IQ NitraLyt Plus 700 IQ
VARiON Plus 700 IQ
3 slots 3 slots
Sensor Types
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Total Suspended Solids
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Optical Measurement of Solids
Particles absorb, reflect, scatter light
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Inte
nsity
Turbidity / Suspended Solids
90° (DIN, ISO, US EPA) < 90°
180° (or back scatter)
Effect of Measuring Angle on Measuring Range
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0.0
4.0
8.0
12.0
16.0
5 10 15 20 25
Nit
rifi
cati
on
SR
T, d
SRT (Solids Retention Time) Required for Nitrification
Design SRT; SF=1.5
Operating Range
Change SRT by changing wasting rate
Min. SRT
Temperature, °C
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Approaches to SRT Control
Qe, Xe
V, MLSS
Qr, Xr Qw, Xr
Qi, Xi
SRT setpoint
Qw
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Sensor Maintenance
Ultrasonic cleaning with UltraClean technology & sapphire windows
• No wipers • No moving parts
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without cleaning system (30 days) with cleaning system (30 days)
UltraClean Ultrasonic Cleaning
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Nitritation - Anammox
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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
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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
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2013 WEF/IWA Nutrient Removal & Recovery Conference
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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
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What Different Wavelengths Tell You About What is in the Sample Measurement & compensation
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Difference Between UV and UV-VIS Sensors
Measurement of NO2 and NO3
• 256 wavelengths measured • 200 – 390 nm • 0.74 nm resolution
wavelength [nm]
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COD, TOC, BOD, NO3-N, TSS mg/l mathematics
Calculation
• Measurement procedure 1. Record spectra 2. Calculate concentrations from model
Models stored in instrument
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Deammonification
• Sidestream treatment (DEMON®, MBBR)
• Mainstream treatment
Applications
46
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CarboVis, NitraVis, NiCaVis, NiCaVis NI
UV-VIS and UV Spectral Measurement
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200 nm 720 nm
Immersible Spectrophotometer
256 wavelengths
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Low Maintenance
Durable / low ownership cost
• Integrated UltraClean ultrasonic cleaning
• Very hard, smooth sapphire window
• No wipers • Titanium / PEEK
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• 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
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Phosphate
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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
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Features
• Low reagent consumption • Optional outdoor climate package • Automatic calibration • Integrated permeate pump • Filter module
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Application Example Chemical Dosing
Flocculating agent
Phosphate [mg/l]
time
Use of P700 IQ for regulation of
flocculating agent dosage
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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)
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Contact Us +1 (937) 767-7241 (800) 765-4974 [email protected] YSI.com @YSIinc