Rads - H2O'C · 2015. 6. 4. · Rads Recap Dr. John OʼConnor, PE [email protected] Tom OʼConnor, PE...
Transcript of Rads - H2O'C · 2015. 6. 4. · Rads Recap Dr. John OʼConnor, PE [email protected] Tom OʼConnor, PE...
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RadsRadsEngineering Evaluation of the Control of
Radionuclides in Missouri Public Water Supplies
Dr. John OʼConnor, PE [email protected]
Tom OʼConnor, PE [email protected]
H2OʼC Engineering
877-22-WATER
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OverviewOverview
About Radionuclides
Radionuclide Removal Technologies
Case Study #1: PWSD #9 of Boone County
Case Study #2: Leadwood, MO
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About About RadionuclidesRadionuclides
Pronunciation
Definition
What They Do
Health Effects
Rads in Regs
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PronunciationPronunciation
+ NEW +
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RadionuclideRadionuclide
+ NEW +
RADIO NEW CLYDE
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What are What are RadionuclidesRadionuclides??
Radioactive material capable of givingoff radiant energy in the form ofparticles or rays as alpha, beta andgamma rays by the disintegration ofatomic nuclei.
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RadiumRadium
Radium-226 / -228
• naturally-occurring
• half-lives of 1,620 / 5.8 years
• primarily alpha / beta emitters
• behave like calcium
• removed by lime softening or ion exchange
• reverse osmosis also a BAT
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Health EffectsHealth EffectsRadionuclides Notice of Data Availability
Technical Support Document, March 2000
“EPA recognizes that, at these levels, the actualhealth impact from ingested radionuclides willbe difficult, if not impossible, to distinguishfrom natural disease incidences, even usingvery large epidemiological studies employingsophisticated statistical analyses.”
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EPA
Health EffectsHealth EffectsRadium Dial Painters
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EPA
Health EffectsHealth EffectsRadium Dial Painters
benign bone growths,
osteoporosis,
severe growth retardation,
tooth breakage,
kidney disease,
liver disease,
tissue necrosis,
cataracts,
anemia,
immunological suppression,
death
Ingestedover 50 mCi
of Ra-226 or -228
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“Peterson et al. (1966) found an elevated rate offatalities from bone malignancies among residentsof Iowa and Illinois with elevated radium-226 indrinking water.
However, the statistical significance was marginaland confounding factors could not be ruled out.”
Health EffectsHealth EffectsThe Three Studies: #1
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“Bean et al. (1982) found an increased incidenceof four out of 10 cancers investigated among Iowaresidents of small communities with elevatedradium-226 content of the water supply.
However, confounding by radon exposure couldnot be ruled out and cancer sites were differentfrom those observed in dial painters.”
Health EffectsHealth EffectsThe Three Studies: #2
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“Lyman et al. (1985) found a small consistentexcess of leukemias in Florida counties withelevated radium-226 or radium-228 in private wells,
but there was no evidence of a dose-responsetrend. Rates of colon, lung and breast cancer andlymphoma showed no consistent excess.”
Health EffectsHealth EffectsThe Three Studies: #3
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“Using RADRISK modeling, EPA estimated that
continuous consumption of 15 pCi/L of most alpha
particle emitters in drinking water at 2 l/day would
pose a lifetime cancer risk between 10-6 and 10-4.”
Health EffectsHealth EffectsComputer Modeling
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Regulatory HistoryRegulatory History
1976 Radionuclides Rule
1991 Proposed Radionuclides Rule
EPA proposed to retain the 15 pCi/L MCL for gross alpha
particle activity, but modify it by excluding radium-226, as
well as uranium and radon. MCLs of 20 pCi/l for radium -226
and -228 were proposed.
2000 Final Radionuclides Rule
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Rads Rads in in RegsRegsRadionuclides of Concern in Drinking Water
Radionuclide MCL
Combined Radium-226 / -228 5 pCi/l
(Adjusted) Gross Alpha 15 pCi/l
Beta Particle and Photon Radioactivity 4 mrems/yr
Uranium 30 µg/l
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Implementation ScheduleImplementation Schedule
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Removal TechnologiesRemoval Technologies
EPAʼs Small System Compliance Technology Listfor the Non-Microbial Contaminants RegulatedBefore 1996 (September 1998)
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Removal TechnologiesRemoval Technologies
• Ion exchange
• Reverse osmosis
• Lime softening
• Greensand filtration
• Co-precipitation with barium sulfate
• Selective sorbents
• Electrodialysis/electrodialysis reversal
• Pre-formed hydrous manganese oxides
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Ion ExchangeIon Exchange
BAT for radium removal (gross alpha follows)
80 - 98% radium removal
point-of-entry, point-of-use (POE/POU)
Radium sorbs preferentially to Ca and Mg
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Ion Exchange WasteIon Exchange Waste
Rinse and Backwash Water
2 - 10% of product water volume
23 - 500 pCi/l
Exhausted Resin
9 pCi/g
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Radium-Selective ResinRadium-Selective Resin
Dowex RSC
Z-88
Can treat millions of bedvolumes over several years
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RSR WastesRSR Wastes
Resin
• is not regenerated
• is a low-level radioactive waste
• must go to a LLRW landfill (UT)
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Reverse OsmosisReverse Osmosis
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Reverse OsmosisReverse Osmosis
BAT for radium removal
87 - 98% radium removal (similar for alpha, beta, photon)
Very high quality effluent (demineralized)
Applicable to POU
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RO WasteRO Waste
Reject water (up to 50%)
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Lime SofteningLime Softening
Radium precipitates as radium carbonate
80 - 95 % Radium removal
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Lime Softening WastesLime Softening Wastes
Lime sludge (~2,000 pCi/l wet, 8 pCi/g dry)
Filter backwash liquid and sludge (6 - 50 pCi/l)
Sludge supernatant (20 - 25 pCi/l)
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Greensand FiltrationGreensand Filtration
Potassium permanganate pretreatment
56 - 90 % radium removal
Detention increases removal efficiency
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Greensand Filtration WastesGreensand Filtration Wastes
Backwash sludge and supernatant (65 - 170 pCi/l)
Eventual media disposal (30 - 250 pCi/g)
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Pre-formed HMOPre-formed HMOHydrous Manganese Oxide
HMO (MnO2) formed by oxidizing manganese sulfate
Brief detention time
Filtration to remove suspended MnO2 (containing sorbed Ra)
71 - 96 % radium removals
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Pre-formed HMO WastesPre-formed HMO WastesHydrous Manganese Oxide
HMO sludge
Filter backwash
Sludge supernatant
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TitleTitle$$
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TitleTitleLiquidLiquid
WastesWastes
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TitleTitleSolids &Solids &
SludgesSludges
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Case StudiesCase Studies
Boone County PWSD #9
Leadwood, MO
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Boone County PWSD #9Boone County PWSD #9Case Study #1
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WellsWells
installed yield (gpm) % of supply
Well #3 (Harg) 1972 700 33.3
Well #4 (Murry / Route Z) 1977 600 33.3
Well #5 (Air Park) 1981 175 0 (standby)
Well #6 (Route J / Mlrsbrg) 1985 700 33.3
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Water QualityWater QualityAverage of all wells
Hardness 300 mg/l as CaCO3
Alkalinity 361 mg/l as CaCO3
Sulfate 20 mg/l
Fe & Mn little to none
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Well # 3 RadionuclidesWell # 3 Radionuclides
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Well # 4 RadionuclidesWell # 4 Radionuclides
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Well # 5 RadionuclidesWell # 5 Radionuclides
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Well # 6 RadionuclidesWell # 6 Radionuclides
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IssuesIssues
• Present treatment: chlorination only (DS II)
• Only one well out of compliance
• Disposal challenges (no nearby sewer)
• Didnʼt have a bazillion dollars lying around
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The Universe of OptionsThe Universe of Options
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Recommendations:Recommendations:
Non-Treatment AlternativesNon-Treatment Alternatives
• upgrade Well #4 to 1,000 gpm ($85,000)
• return Well #5 to routine service (H2S?)
• Blend Well #5 with Well #3 to meet rads regs
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Leadwood, MOLeadwood, MOCase Study #2
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TitleTitle
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Filtronics Filtronics SystemSystem
CONTACTORS
FILTERS
(in parallel)
ferric chloride
and chlorinesulfur
dioxide
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FiltronicsFiltronics
• Iron and manganese removal
• Not on EPAʼs list of rads removal technologies
• “It worked in the pilot study…”
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HH22OO’’C EngineeringC Engineering’’s Jobs Jobclient: MDNR
1) Evaluate plant performance (rads removal)
2) Restore plant to factory specifications
3) Re-evaluate plant performance
4) Recommend improvements if necessary
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ContactorsContactors
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SulfurSulfur
DioxideDioxide
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FiltersFilters
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Electromedia Electromedia II
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HH22OO’’C EngineeringC Engineering’’s Jobs Jobclient: MDNR
1) Evaluate plant performance (rads removal)
2) Restore plant to factory specifications
3) Re-evaluate plant performance
4) Recommend improvements if necessary
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HH22OO’’C EngineeringC Engineering’’s Jobs Jobclient: MDNR
1) Evaluate plant performance (rads removal)
2) Restore plant to factory specifications
3) Re-evaluate plant performance
4) Recommend improvements if necessary
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Plant RestorationPlant Restoration
• Backwash rates
• Filter flow rates
• Breakpoint curve
• Chemical feeds
• Media replenishment (one filter only)
• Filtronicsʼ approval
Breakpoint Curve - Leadwood, MO 7/9/03
0
1
2
3
0 1 2 3 4 5
Chlorine Applied, mg Cl/l
Chlo
rine R
esid
ual, m
g C
l/l
Total Chlorine
Free Chlorine
Chloramine
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HH22OO’’C EngineeringC Engineering’’s Jobs Jobclient: MDNR
1) Evaluate plant performance (rads removal)
2) Restore plant to factory specifications
3) Re-evaluate plant performance
4) Recommend improvements if necessary
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Restored Plant PerformanceRestored Plant Performance
Words
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Restored Plant PerformanceRestored Plant Performance
Words
• Modest removals
• Comparable to historical data
• Removals insufficient to meet MCLs
• Depleted filter performed slightly better
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HH22OO’’C EngineeringC Engineering’’s Jobs Jobclient: MDNR
1) Evaluate plant performance (rads removal)
2) Restore plant to factory specifications
3) Re-evaluate plant performance
4) Recommend improvements if necessary
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Best Bets of Best Bets of BATsBATs
1. Pre-formed Hydrous Manganese Oxide (HMO) Filtration
2. Greensand Filtration
3. Coprecipitation of Radium with Barium Sulfate
4. Ion Exchange
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HMO FiltrationHMO Filtration
1) Change of chemical feed from ferric sulfate to
manganese sulfate
2) Elimination of sulfur dioxide feed (officially)
3) Projected rads removals: ~80% (Valentine, 1992)
3) Capital cost: $0 (zero, zilch, nada, bupkis, bagel)
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Non-Treatment SolutionsNon-Treatment Solutions
Source Substitution
Well Replacement, Selective Withdrawal, Purchasing
Blending
Regionalization
Do Nothing“A Radiological SNC is a PWS which… exceeds the unreasonable
risk to health level identified for that contaminant. The
unreasonable health level is 2 times the MCL.” (EPA’s
Implementation Guidance for Radionuclides)
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Rads Rads RecapRecap
Dr. John OʼConnor, PE [email protected]
Tom OʼConnor, PE [email protected]
H2OʼC Engineering
877-22-WATER
About radionuclides
Radionuclide removal technologies
Case Study #1: PWSD #9 of Boone County
Case Study #2: Leadwood, MO