Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring...
Transcript of Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring...
![Page 1: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/1.jpg)
Online Monitoring of Metaldehyde
Alice Elder, Affinity Water
Jeff Stubbs, Anatune Ltd.
![Page 2: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/2.jpg)
Contents
• The challenge
• The solution
• The future implications
![Page 3: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/3.jpg)
WTW Site Overview
• 36 Mld Treatment Works serving North London
• 4 groundwater sources• One on-site, 3 off-site (furthest being 7.5km away)
• Karstic geology• Heavily surface-influenced• Flashy
• Site is subject to a DWI Undertaking for metaldehyde• Treatment of individual and total pesticides• Online monitoring
![Page 4: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/4.jpg)
Water Quality Challenges
On site
borehole
Remote
source 1
Remote
source 2
Remote
source 3Seasonal
Metaldehyde
(Max 4.55 ug/l)
Historic Aquifer
Pollution –
Metaldehyde
(Ave. 0.19 ug/l)
Historic Aquifer
Pollution –
Metaldehyde
(Ave. 0.07 ug/l)
Seasonal
Metaldehyde
(Max 0.29 ug/l)
Other pesticides Other pesticides
Turbidity
(>100 NTU)
Turbidity
(>10 NTU) (>30 NTU)
Turbidity
(>60 NTU)
Nitrate
(>70 mg/l)
Bromates
(~30 ug/l)
![Page 5: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/5.jpg)
Source Metaldehyde Trends
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
![Page 6: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/6.jpg)
Existing Treatment
Membrane Ultra Filtration(Disinfection/Crypto removal)
Granular Activated Carbon Filters
Remote 2(8.73 Ml/d)
Remote 3(4.5 Ml/d)
Remote 1(9.09 Ml/d)
Onsite(9.09 Ml/d)
Clarifiers
Bromate Blending
Final Conditioning(Residual Disinfectant/Plumbsolvency)
Metaldehyde Blending
Abstraction management
Waste
Handling
Main Unresolved Issues:• Metaldehyde• Loss of output
![Page 7: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/7.jpg)
More Challenges….
• Some current treatment methods struggle to remove some compounds
• Newer removal techniques more costly
• Treatment only needed when a trigger value exceeded
• Treatment being wasted if used when levels are low
• Need for a better ‘Control Philosophy’ for treatment management
• More measurements needed with quicker results turnaround
![Page 8: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/8.jpg)
Importance of More Measurements
• 1 daily sample taken for lab (around 12pm in example above)
• Lab sample misses the spike in pesticide concentration overnight
• Monitoring every hour allows changes in levels to be observed
• Action can be taken on results immediately rather than wait for lab results
![Page 9: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/9.jpg)
Potential Solution
• Increase sampling frequency (more per day?)
• Prioritise samples to get results quicker
Issues
• More transporting samples to lab
• Increased pressure on lab to turnaround
• Water has left WTW when results are obtained
• Hard to make decisions when issue has gone
• Not the most efficient use of time/money
Potential Solutions & Issues
![Page 10: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/10.jpg)
✓ Allows monitoring at WTWs
✓ More data points to make better decisions
✓ Faster turnaround than taking samples to lab
Issues
× Sensitivity – some unable to detect below trigger levels
× Compound specific
× Comparison with lab results questionable
What About Current Online Instrumentation?
![Page 11: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/11.jpg)
What Was Needed….
• Install instrumentation used in lab (proven, reliable, sensitive) at WTW• Automate sample preparation so whole workflow can be as unattended as
possible• Results as quickly as possible• Lab grade/UKAS accredited, comparable results• Similar sensitivity to lab performance• GC or LC platforms• Mass Spec/Diode Array/UV detection• Potential to link data to SCADA input and treatment control philosophy• Gives greatest degree of monitoring with best measurement performance• Saves wasting expensive treatment measures when not required
![Page 12: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/12.jpg)
Online Monitor Solution -Instrumentation
Agilent 7890/7000C GC-QQQ (Analyser)
GERSTEL Dual Head Multipurpose Sampler (MPS) with SPE (Automated Sample Prep)
Flow Cell
![Page 13: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/13.jpg)
Online Monitor Solution -The Cabin
![Page 14: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/14.jpg)
System OverviewMonitoring KioskSite SCADA
Anatune
Instrument
Control SystemSampling & Filtration
waste
Source 1
Source 2
Source 3
Data
Results
Trending
Alarms / Events
Remote Control
Site
PLC
![Page 15: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/15.jpg)
Validation Summary
15 footer
Aqua-Check 516 Result Aqua-Check 520 Result
516 A 0.1012 520 A 0.0795
516 B 0.1022 520 B 0.0823
516 C 0.1022 520 C 0.0737
516 D 0.1072 520 D 0.0795
516 E 0.1016 520 E 0.0759
516 F 0.1026 520 F 0.0791
Average Result (ppb) 0.1028 Average Result (ppb) 0.0781
Reported (ng/L) 102.8 Reported (ng/L) 78.1
Assigned Value (ng/L): 95.3 Assigned Value (ng/L): 77
Z_score (-2 to 2) 0.79 Z_score (-2 to 2) 0.17
Carried out = 21/11/2016 Carried out = 06/02/2017
![Page 16: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/16.jpg)
Current Instrument Status
• Running since September 2016
• Real live data
• Running in low and high frequency modes
• Improvements on operator intervention frequency
• Data validation and transfer refinements to SCADA
• Results better than the lab!!
• Concept proven. Other compounds and different analysers being discussed for other problem sites
![Page 17: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/17.jpg)
• ITT went out in January 2017
• Offer letter sent out in August 2017
• Contract still to be signed
• Design Specification to the tenderers• Metaldehyde• Turbidity• Aluminium
• Anatune online metaldehyde monitor was a critical component in developing designs
The Treatment Solution
![Page 18: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/18.jpg)
Remote
Source 1
Remote
Source 2
Remote
Source 3
Onsite
Source
New pipe
route to site
Existing
pipe route
to site New
treatment
processes
The Solution - Sources
![Page 19: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/19.jpg)
The Solution - Technologies
To GAC adsorbers
Four sources
Actiflo-
Turbo
Actiflo-
Carb
![Page 20: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/20.jpg)
PAC
Dosing
New treatment
Remote
Source 1
Existing WTW
Anatune monitor
Feed forward control Feed back control
SCADA
Remote
Source 2
Remote
Source 3
Onsite
Source
The Solution – Control
![Page 21: Online Monitoring of Metaldehyde - SWIG | Sensors for Water … · 2017-10-05 · Online Monitoring of Metaldehyde Alice Elder, Affinity Water Jeff Stubbs, Anatune Ltd. Contents ...](https://reader036.fdocuments.us/reader036/viewer/2022081612/5f7571c392dbed22217df0f2/html5/thumbnails/21.jpg)
• Implications for Affinity Water and PR19
• Implications for the industry
AMP6 AMP7 AMP8 Beyond…
The Future