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Instrumentation Based Control Systems:
Controlling Processes using online, real-time BOD data
Who we are….• The development of the Proteus emerged from a Knowledge Transfer
Partnership between RS Hydro and the University of Birmingham; the aim was to develop a probe that was capable of measuring BOD in real-time.
• The result?
• A multi-parameter probe that uses fluorescence to monitor BOD, COD, TOC and Total coliforms (and variations there upon) in real-time.
Who we are
Technology behind the Proteus
• Different groups of organic matter have different known excitation and emission wavelengths – i.e when we excite at a specific wavelength of light it emits at another wavelength
Technology behind the Proteus
Tryptophan-like fluorescence
Fulvic-like fluorescence
Technology behind the Proteus
Technology behind the Proteus
• Different groups of organic matter have different known excitation and emission wavelengths – i.e. when we excite at a specific wavelength of light it emits at another wavelength
• The Proteus uses ‘Tryptophan-like fluorescence’ (TLF) as part of an algorithm which includes compensation for temperature and turbidity to derive BOD.
Technology behind the Proteus
Case Study: Wastewater Treatment
Work (WWTW)
The need for control at WWTWs
• Relatively high energy costs
• Balance to maintain microbe level in ASP treatments
• Variable influent hydraulic & organic loads – daily, weekly, seasonal & storm-based variability
• Increasing pressure to minimise environmental damage with discharges & better Pollution Incidence Prevention
• Greater need for more operational efficiency within discharge limits
• Joined up smart network control with influent sewers
• Inflexible & mechanical operating regimes
But why BOD?
• Previously held back by 5 day waiting period to report results-Realtime BOD is a game-changer…
• Closest to replicating the natural oxidation and recovery conditions in aquatic systems
• Not as narrow as DO as it encompasses all oxygen consuming constituents of the wastewater – provides context
• Compliances set around BOD – 70-80% reduction – BOD is a far more effective measure of assessing whether or not water is ‘safe’ for discharge compared to Ammonia alone.
• Almost every WWTW worldwide has a permit for BOD5.
A landmark project…
• Proteus Instruments, in collaboration with a major UK water company’s innovation team, launched an unprecedented project to prove the Proteus’s capabilities of measuring BOD in real-time with the aim of using that to control their wastewater treatment processes & compliance discharges.
• Used the Proteus simultaneously with grab sampling for lab BOD assessment to provide a direct comparison and analysis
A Landmark Project…
Automated Sampler
Peli-case containing telemetry unit and SDI-12 Converter
Battery powering peli-case and Proteus
Proteus
Post-PST Tank
The BOD5 vs Proteus sampling process…
PST – 25, 248 (PE)
y = 0.7505x + 29.543R² = 0.8321
y = 0.96xR² = 0.7484
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Proteus BOD
Sample N Date Time Lab 1 Lab 2 Lab 3 Mean Tryp+Turb
1 20/08/2019 17:00 110.00 106 113 109.67 98.65882347
2 20/08/2019 19:00 120.00 97 135 117.33 98.02031977
3 20/08/2019 21:00 130.00 132 142 134.67 122.2413768
4 20/08/2019 23:00 150.00 168 170 162.67 121.4538483
5 21/08/2019 01:00 150.00 117 138 135.00 106.2498382
6 21/08/2019 03:00 15.00 9 11 11.67 9.9788943927 21/08/2019 05:00 15.00 21 38 24.67 73.12366959
8 21/08/2019 07:00 65.00 61 70 65.33 67.72887008
9 21/08/2019 10:25 97.00 64 93 84.67 96.92740593
10 21/08/2019 10:40 110.00 96 126 110.67 95.00707447
11 03/09/2019 17:00:00 280 * 142 179 160.50 150.5329559
12 03/09/2019 19:00:00 180.00 191 184 185.00 169.2741981
13 03/09/2019 21:00:00 180.00 187 208 191.67 165.3237232
14 03/09/2019 23:00:00 17.00 16 13 15.33 28.68921222
15 04/09/2019 01:00:00 13.00 15 9 12.33 38.79471772
16 04/09/2019 03:00:00 130.00 151 157 146.00 169.4028294
17 04/09/2019 05:00:00 11.00 17 3 10.33 74.95093111
18 04/09/2019 07:00:00 80.00 74 70 74.67 114.5074746
19 04/09/2019 10:35 53 * 111 122 116.50 101.1764717
20 04/09/2019 10:55 100.00 112 137 116.33 162.672362
21 07/01/2020 17:00 170.00 143 127 146.67 165.5506886
22 07/01/2020 19:00 180.00 186 155 173.67 166.0854778
23 07/01/2020 21:00 200.00 188 182 190.00 179.3388339
24 07/01/2020 23:00 200.00 167 178 181.67 180.1765359
25 08/01/2020 01:00 160.00 184 128 157.33 158.8425719
26 08/01/2020 03:00 140.00 166 121 142.33 139.7914043
27 08/01/2020 05:00 41.00 22 31.50 53.89648625
28 08/01/2020 07:00 27.00 20 16 21.00 29.08821754
29 08/01/2020 09:25 130.00 128 129.00 103.151579
30 08/01/2020 09:45 120.00 138 97 118.33 104.6924087
Sample N Date Time Lab 1 Lab 2 Lab 3 Mean Tryp+Turb
1 13/11/2019 17:00 6.00 7 6.9 6.63 5.20
2 13/11/2019 19:00 9.00 3 5.6 5.87 5.33
3 13/11/2019 21:00 7.00 4 6.8 5.93 6.17
4 13/11/2019 23:00 9.00 3 6.9 6.30 7.03
5 14/11/2019 01:00 12.00 2 8 7.33 8.25
6 14/11/2019 03:00 16.00 2 14.1 10.70 11.36
7 14/11/2019 05:00 22.00 7 14.4 14.47 12.61
8 14/11/2019 07:00 19.00 2 11.9 10.97 10.96
9 14/11/2019 09:40 15.00 2 7.8 8.27 8.10
10 14/11/2019 09:55 10.00 3 9 7.33 8.01
11 19/11/2019 17:00 4.00 6 6.2 5.40 6.58
12 19/11/2019 19:00 0.00 6 7.6 4.53 5.73
13 19/11/2019 21:00 0.00 7 8.5 5.17 5.92
14 19/11/2019 23:00 3.00 7 10.8 6.93 5.67
15 20/11/2019 01:00 0.00 6 8 4.67 5.76
16 20/11/2019 03:00 2.00 6 8.6 5.53 5.60
17 20/11/2019 05:00 3.00 6 7.6 5.53 5.95
18 20/11/2019 07:00 7.00 8 8.2 7.73 5.89
19 20/11/2019 09:35 4.00 7 7.9 6.30 5.46
20 20/11/2019 09:50 6.00 8 7.4 7.13 6.15
21 04/12/2019 17:00 *26 6 6.8 6.40 7.38
22 04/12/2019 19:00 *15 7 6.3 6.65 7.43
23 04/12/2019 21:00 *20 6 8.3 7.15 7.13
24 04/12/2019 23:00 *13 6 6.1 6.05 7.35
25 05/12/2019 01:00 *12 6 7 6.50 6.56
26 05/12/2019 03:00 *23 6 7 6.50 6.81
27 05/12/2019 05:00 *7 6 6.7 6.35 6.53
28 05/12/2019 07:00 *5 9 7.8 8.40 7.25
29 05/12/2019 09:40 *7 7 8.6 7.80 7.10
30 05/12/2019 09:55 *14 8 7.5 7.75 7.15
If you consider that BOD5 is probably +/-20% of reading at best +/- 1to2mg/l and that 80% of the readings are between 4-8mgl. This degree of correlation is extraordinary and is a real PLUS for the Proteus given this very small measurement range.
Final Effluent – 311 (PE)
y = 0.9845xR² = 0.7281
y = 0.779x + 1.5686R² = 0.7872
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Proteus BOD
Large WWTW (300,000 PE) controlling ASP process
Large WWTW (300,000 PE) controlling ASP process
Large WWTW (300,000 PE) controlling ASP process
Anatomy of install…Anatomy of an Installation
Ammonium ISE
TLF Fluorometer
Wiper and Turbidity sensor
pH/ ORP
Temp
Reference electrodeThis Proteus has been in-place for three months and has experienced zero dropouts and no maintenance required!
SCADA Data
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pH
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Turb
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OD
ASP Water Quality
BOD_mg/L Turb_NTU COD_mg/L Temp_deg_C NH4_mg/L-N pH_units
Data Observations & Findings
• Ammonia/BOD pattern
• Aeration control based on BOD is better than ammonia
• Potential cost saving for aeration compared to fixed speed
• Ensures greater process stability
• Optimise treatment to utilise consent limits more fully.
• Feed-Back or Feed-Forward approaches.
Data Observations and Findings
Small is beautiful….
• Don’t need to have to be PLC based systems...
• BOD is a parameter that has massive potential to control global WWTWs and environment
• Locations required often have no power.
• Solar based low powered systems (permanent or portable)
• SCADA ready systems using Cloud/API connections.
• True early warning systems based on direct measurement and not secondary parameters such as DO or ammonia.
• Allows users to identify potential problems long before process or ecosystem is out of control.
Small is beautiful
Case Study: Whisky Distillery
Previously tried a UV-VISsystem for 6 months – nocorrelation to BOD despitemanufacturer claims.
Peli-case containing telemetry unit and SDI-12 Converter with solar panel.Can be AC/DC powered.
Installed by client in 30mins
Data sent to cloud and connected to SCADA using API/xml
Very happy Environmental Manager
Whisky Distillery – Semi-permanent - SCADA
• Superb correlation given that sampling range was only 8-15mgl. Combined sample/lab accuracy is +/-20% of reading at best.
• Client was so impressed with data they requested 5 more systems within 24 hours generating their first report.
• Near real-time SCADA connection allows operators to control effluent discharges and ensure 100% compliance 24/7.
Whisky Distillery – Site calibration data
• The Proteus (patented) is pushing the boundaries of fluorescence technology and getting encouraging results
• We are still learning and developing with each new application
• The Proteus is already being used successfully around the globe
• BOD5 has its place but today presents a new era of real-time BOD; there are endless benefits to being able to now monitor BOD in real-time
Summary
• We have c.25 distributors appointed in last 12 months
• The Proteus has proved that it is more than capable of improving upon BOD5
• Already providing real-time protection for WWTWs & Environment across the globe.
Success to Date
What could you use Proteus for?
Efficiencies?Process stability?Energy Saving?
Real-time alerts?Infrastructure connection?
