The City of Alliance has had some bad tasting water for years. The Water plant looked for options. The City hired Arcadis to design a UV Oxidation solution. This presentation describes teh rationale for selecting UV Oxidation for T&O treatment
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Ohio AWWA City of Alliance Selection of UV Oxidation for Taste & Odor treatment
1. Said Abou Abdallah, Terry Keep and Dr. Dean Reynolds
Ohio AWWA
September 20, 2012
The City of Alliance's Solution for
Taste and Odor Treatment
2. 2
WATER STRESS
IN AN
INTERCONNECTED
WATER SUPPLY
Sources of contaminants in
our water supply:
- Industrial discharge
- Agricultural runoff
- Chemical releases
- Municipal Wastewater
Injection
Well
Extraction
Well
Nutrients increase in Algae Blooms Taste & Odour, Algal Toxins
3. 3
EXAMPLES OF MICROPOLLUTANTS
Nitrosamines (e.g. NDMA)
Disinfection byproducts
Pesticides & Herbicides
Metaldehyde, Atrazine, Isoproturon, others
Petroleum Additives
Including MTBE
Pharmaceuticals & Personal Care Products
Includes potential endocrine disruptors
Taste & Odour Compounds
Seasonal occurrences of MIB, geosmin and others
Algal Toxins
Chronic and acute effects from cyanobacteria-derived
toxins
4. 4
TASTE & ODOUR, ALGAL TOXINS
Seasonal algae blooms occur in surface
waters
Decaying algae blooms result in MIB,
geosmin, algal toxins, other T&O
compounds
Earthy/musty, fishy, swampy, grassy
tastes & odours at low ppt
concentrations
Difficult to remove with conventional
technologies
T&O episodes compromise public
confidence in the safety of the water
5. 5
COMPOUNDS GENERATED BY SOME CYANOBACTERIA
Geosmin
2-Methylisoborneol (MIB)
GSMand MIBcan be detected
by sensitive individual down to
4 ng/L (ppt)
[Geosmin] have been
measured > 3000 ng/L
Aesthetics: T&O cmpds
Cylindrospermopsin (CYN)
Microcystin-LR (MC-LR) [MC]~1800ug/L meas drng bloom
Public Health: Cyanotoxins
W
HO
set lim
it at 1
µg/L
USEPA
added
CNTX
to
the
CCL
6. 6
TASTE AND ODOUR TREATMENT STRATEGIES
• Potassium Permanganate
– Limited Effectiveness
• Powdered Activated Carbon
– Messy PAC & Sludge Handling, no Performance Guarantee
• Granular Activated Carbon
– Frequent & Expensive Change-outs, no Performance Guarantee
• Ozone
– Complicated System & Carcinogenic by-product (Bromate)
• UV-Oxidation
– Simple, Effective for T&O with Simultaneous Disinfection, Guaranteed
Performance for life of system
7. 7
UV / H2O2 FOR TASTE AND ODOUR TREATMENT
UV Advanced Oxidation: Using UV and Hydrogen Peroxide to destroy
trace organic contaminants in water by:
UV-Photolysis
UV-Oxidation
11. 11
Planning and Engineering Approach to the
Final Design
o UV Oxidation System Feasibility Study
o UV Oxidation System Procurement
o UV Oxidation System Final Design Documents
o Design Criteria:
• UVT 92%
• Turbidity < 0.06 NTU
• TOC < 3 mg/l
• Nitrates < 1 mg/l
• pH 6.7 – 6.9
• Average Flow 5.5 MGD/10.0 MGD Max
12. 12
UV Oxidation System Feasibility Study
• Actual Costs of using Powered
Activated Carbon (PAC)
• UV Oxidation Process
• Electrical Costs
• Hydrogen Peroxide Cost
• Chlorination Cost
• Equipment Manufacturer's Variations
• Design Requirements
• Non-Cost factors
13. 13
UV Oxidation System Feasibility Study
• PAC (Powder Activated Carbon)
System Capabilities and
Limitations
• Type of PAC used
• Impact on Other Treatment
Processes
• Operational Difficulties
• Future Limitations
17. 17
UV Oxidation System Feasibility Study:
Findings
• Procurement Recommendations for UV Oxidation System
• Capital Costs and Operation & Maintenance Costs
• Non-Cost Factors (Vendor Experience)
• Impact on Water Users – Water rate, water quality
• Schedule of Implementation
18. 18
UV Oxidation System Procurement
• Traditional Design vs. Pre-selection
• Variations with Manufacturer’s
Designs
• UV Oxidation Equipment Essential
and Critical for Taste and Odor
• UV Oxidation Equipment Represents
Significant Project Cost
• Multiple Available Strategies
• Balancing Qualifications/Experience
and Costs
• Early Procurement Prevents
Duplications and Delays
19. 19
UV Oxidation System
Procurement:
Key Considerations
• Tight Procurement
Documents
• Scope of Equipment
• Warranty
• Proposal Information
• Operating Parameters
• Capital Cost Analysis vs.
Present Worth Analysis
• Bidding Conditions
• Decision Analysis and
Weighting
20. 20
UV Oxidation System: Procurement
• Bid items
• Clear and specific
• Bid Requirements
• Financial Stability
• Experience and Past Performance
• Demonstration of successful
Operations
• Equipment Service and
Support
• Equipment Characteristics and
Flexibility
• Future Capacity
• Operations and Complexity
21. 21
UV Oxidation System: Procurement
• Cost Factors:
• Capital Cost
• O&M Cost
• Common Cost Parameters
• Energy Cost
• Chemical Cost
• Interest rates
• PW period
22. 22
UV Oxidation System:
Effective Integration of Quality and Cost
• Designed to meet the
Client and Project Goals
• Balanced between Cost
and Non-Cost Factors
• Qualifications/Experience
Emphasis
• Broad Spectrum of
Evaluation
23. 23
UV Oxidation System:
Final Design Documents
• Design Documents to Allow the Installation of
the Procured Equipment
• UV Oxidation Units
• Hydrogen Peroxide Feed and Storage System
• Chlorine Feed System
• Future Provisions
• Performance Testing
24. 24
UV Oxidation System:
Final Design Documents
• Two 30-Inch Diameter Reactor in Series
• Cooling System for Use During Filter
Backwash Operations
• Operator Input During Chlorine Trouble Times
• Dedicated Automatic Chlorinator for UV Ox Operation
• System Bypass During Non- Taste and Odor Season
25. 25
UV Oxidation System:
Final Design Documents
• Hydrogen Peroxide System
• One 3,000 Gallon Hydrogen Peroxide Bulk
Storage Tank
• Two Day tanks with Duplex Feed pump
System
• Double Containment Piping
• Chlorine Feed System Capacity Upgrade
• New Chlorine Evaporator
• Dedicated Chlorinator for UV Ox
• Use of Liquid Chlorine with Back-up Gas
Manifolds
• Re-training of personnel on use of new
Chlorine System
26. 26
UV Oxidation System:
Final Design Documents
• Future Chloramination
• Provisions for Feed System
• Provisions for Multiple
Monitoring Locations
• Implementation Schedule
• Construction Project Bidding
in September/October 2012
• Construction NTP November 2012
• Substantial Completion September 20132013
• Performance Testing by December 2013
27. SWIFT ECT 16L30” UV Reactor
30” Reactor
On line UV
Transmittance
Monitor
28. 28
QUESTIONS?
Terry Keep
ECT Sales Manager
Trojan Technologies
519.457.3400
tkeep@trojanuv.com
Said AbouAbdallah, PE | Associate Vice President
Malcolm Pirnie | The Water Division of ARCADIS
216.781.6177
said.abouabdallah @arcadis-us.com