effective use of peracetic acid to reduce effluent disinfection byproduct in water resource recovery...
TRANSCRIPT
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Effective Use Of Peracetic Acid to Reduce Effluent Disinfection Byproduct in Water Resource Recovery FacilitiesIsaiah Shapiro, EITDimitri Katehis PhD, PEDave Hagan, PE
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Outline
• Background and Problem
Identification
• Evaluation Approach
• Bench and Pilot Scale Testing
• Conclusion
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Outline
• Background and Problem
Identification
• Evaluation Approach
• Bench and Pilot Scale Testing
• Conclusion
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City of Largo
• Located in Pinellas County• 4th largest City in Tampa
Bay• Serves about 75,000
residents
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WASTEWATER RECLAMATION FACILITY• Advance Wastewater Treatment Plant (AWTP)
– BOD:TSS:TN:TP = 5:5:3:1
• Influent Flow– Permitted: 18 MGD– Current: 12.5 MGD
• Effluent Discharge– Reuse: 50%– Surface Water Discharge: 50%
Headworks Primary Clarifiers A2O Process Secondary
Clarifiers
ABW FiltersDeep Bed Filters
Disinfection & DechlorinationReuse or SWD
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Expanded Environmental Stewardship Goals
• Florida Department of Environmental Protection (FDEP)
• More stringent regulation of disinfection byproducts (DBPs) in the surface water discharge– bromo-dichloro-methane (BDCM)
• Existing Disinfection System– Chlorination with gaseous chlorine– Dechlorination with sulfur dioxide
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Effluent BCDM Limits
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Outline
• Background and Problem
Identification
• Evaluation Approach
• Bench and Pilot Scale Testing
• Conclusion
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Evaluation Objective
• Reduce the effluent BDCM discharged to surface waters–Annual Average BCDM Limit• Interim: 30 μg/L• Final: 22 μg/L
• Provide an efficient and effective means of disinfection
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Why not just UV?
• High Concentration of Dissolved Organics
• Very low UVT (38%)
• Low UVT mostly on wet weather flows
• Typical design UVT: 55-65%
• Double the cost ($$$)
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Evaluation Approach
• Alternative Approaches:– Reduce Precursor (i.e. Dissolved
Organics)– Replace Gaseous Chlorine– Remove BCDM after it forms
• Treatment Configurations:– Full Flow Treatment– Split Flow Treatment
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Split Flow Treatment
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Many Options
Chlorine
Full Flow
Remove Precursor
Ozone
GAC/PAC
MIEX
Replace Chlorine
Ozone
PAA
Improve UVT
Ozone/UV
PAA/UV
GAC/PAC/UV
Ferrate/UV
MIEX//UV
Remove DBPs GAC/PAC
Aeration
OtherSplit Flow Same
• 31 Alternatives Evaluated
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Outline
• Background and Problem
Identification
• Evaluation Approach
• Bench and Pilot Scale Testing
• Conclusion
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Preliminary Evaluation
Technology Disinfection Precursor Removal
BDCM Removal
Bench Scale Testing
Ozone
Hydrogen Peroxide
MIEX
PAC/GAC
Ferrate
PAA
Desktop Studies
Coagulation
Aeration
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Viable Alternatives
Configuration Alternatives
Full Flow Treatment (FT) Ozone
Split Flow Treatment (ST)
Ozone + NaOCl
PAA + NaOCl
UV (48% UVT) + NaOCl
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Non-Cost Criteria Analysis
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Viable Alternatives - Costs
5% Interest, 20 Years
Configuration Alternatives PW - 20% Present Worth PW + 35%
Full Flow Treatment (FT) Ozone $14.9M $16.7M $19.8M
Split Flow Treatment (ST)
Ozone + NaOCl $12.7M $14.2M $16.8M
PAA + NaOCl $11.7M $12.2M $13.1M
UV (48% UVT) + NaOCl $14.7M $16.1M $18.5M
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Pilot Testing – UV and Ozone
• BCDM Reduction– Ozone was not able to
reduce BCDM below 22 μg/L• Dose up to 7 mg/L
• Precursor Removal:– Increase the filter
effluent UVT from 45% to 55%• Dose up to 10 mg/L
Advanced Oxidation Unit
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Pilot Testing – UV and Ozone
• UVT Response to Applied Ozone Dose
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PAA Pilot Testing
18,000-gallon Baffled Contact Tank
• Solvay Proxitane® WW-12 PAAComponent Concentration (% by wt)Peracetic Acid 12Hydrogen Peroxide 18.5Acetic Acid 15
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PAA Pilot Testing
• Theoretical Detention Times– 15 min, 30 min & 45 min
• Dye Testing– Hydraulic Short Circuiting
• Actual Detention Times– 2 min, 4 min & 7 min
• Dosage Range:– 1.0 to 4.0 mg/L
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PAA Pilot Testing
DatePAA
Dose, mg/L
DT, min. Inf./Eff. BDCMμg/L
TTHMμg/L
T HAAμg/L
Bromateμg/L
26-Jul 3.5 4 Influent 4.1 20 4.6 5.0 U
26-Jul 3.5 4 Effluent 3.9 19 7.3 5.0 U
27-Jul 3.0 7 Influent 4.8 20 3.9 5.0 U
27-Jul 3.0 7 Effluent 4.2 18 6.8 5.0 U
• Results
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Follow Up Bench Scale Testing
Refining dose:• 2.5 mg/L to 3.5 mg/L• Actual contact time of 15 min to 30 min
Blend Sample
s
BDCM & Residual
PAA or Cl2
Sample Add Hypo Dose
Wait 15 min
BDCM & Residual Chlorine
Sample Add PAA Dose
Wait 15 min
BDCM & Residual
PAA
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What happens when NaOCl and PAA mix?
Solution No. Sample Dose (mg/L) 15-min. Residual (mg/L) BDCM (µg/L)
- Filtered effluent 0 0 1.9
1 Filtered effluent 2.5 PAA 1.0 PAA 1.6
2 Filtered effluent 3.5 PAA 1.3 PAA 1.6
3 Filtered effluent 12 -Cl2 2.2 Cl2 14
4 Filtered effluent 9 - Cl2 1.3 Cl2 15
1 & 3 Blend NA 0.02 7.7
1 & 4 Blend NA 0.01 6.7
2 & 3 Blend NA 0.01 7.1
2 & 4 Blend NA 0.02 6.8
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Results of Pilot Testing
• Peracetic Acid (PAA)– Effective dosages
• 3.0 mg/l @ 30 min• 3.5 mg/L @ 15 min
– Effective reduction of DBPs– No increase of toxicity (WET Testing)– Minor to no impact on BOD, Turbidity,
Conductivity or pH– Increases the DO of the effluent (1 to 5 mg/L)– Little need for quenching of PAA residual when
mixed with chlorine residual
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Outline
• Background and Problem
Identification
• Evaluation Approach
• Bench and Pilot Scale Testing
• Conclusion
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Conclusion
• PAA can be a cost-effective high level disinfection alternative to reduce disinfection by-products
• Split treatment option provides:–Reliability–Flexibility–Cost Control
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Where are we today?
• Operations Permit Modification (2014)• Final Design (2014)• Award May 2015 ($13.7 M)
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Acknowledgements
• Freddy Betancourt, PE, LEED AP, ENV SP – Greeley and Hansen
• David Hagan, PE – Greeley and Hansen• Leland Dicus, PE – City of Largo• Chuck Mura, PE – City of Largo• Our partners at CDM Smith
Special Thanks!• Bob Freeborn, Peragreen Solutions• John Maziuk, Solvay Chemicals
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Thank You!