Teaching Metacognition Marsha C. Lovett, Ph.D. [email protected].
Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP
-
Upload
zephr-case -
Category
Documents
-
view
33 -
download
0
description
Transcript of Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP
![Page 1: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/1.jpg)
Selenium Removal from Mine Selenium Removal from Mine WatersWaters
Raymond J. Lovett, Ph.D.Raymond J. Lovett, Ph.D.Environmental ChemistEnvironmental Chemist
ShipShaper, LLPShipShaper, LLPMorgantown, WVMorgantown, WV
![Page 2: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/2.jpg)
SUPPORTSUPPORT
National Mine Land Reclamation Center, National Mine Land Reclamation Center, West Virginia UniversityWest Virginia University
United States Office of Surface MiningUnited States Office of Surface Mining
Magnum Coal CompanyMagnum Coal Company Catenary CoalCatenary Coal
![Page 3: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/3.jpg)
Typical Southern West Typical Southern West Virginia Mine WaterVirginia Mine Water
[Se] = 13 ug/L[Se] = 13 ug/L[Fe] = 0.15 mg/L[Fe] = 0.15 mg/L[SO[SO44
-2-2]] = 980 mg/L= 980 mg/L
Alkalinity = 235 mg/L as CaCOAlkalinity = 235 mg/L as CaCO33
pH = 7.1pH = 7.1
![Page 4: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/4.jpg)
ProblemsProblems
Overriding ConcernOverriding ConcernRegulatory limit near 5 ug/LRegulatory limit near 5 ug/L
Specific Problems for TreatmentSpecific Problems for TreatmentLow level of SeLow level of SeDiffering chemistriesDiffering chemistries
Selenate, SeOSelenate, SeO44-2-2, Se(VI), Se(VI)
Selenite, SeOSelenite, SeO33-2-2, Se(IV), Se(IV)
![Page 5: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/5.jpg)
Selenium Removal Selenium Removal DifficultiesDifficulties
Different dissolved speciesDifferent dissolved speciesNo direct precipitation chemistriesNo direct precipitation chemistriesReduction of selenate is difficult Reduction of selenate is difficult
(slow)(slow)Sulfate may interfereSulfate may interfere
![Page 6: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/6.jpg)
Treatment System Treatment System ObjectivesObjectives
Effluent maximally 5 ug/L Effluent maximally 5 ug/L SeSe
Low installation costLow installation costLow operating costLow operating costPassivePassive
![Page 7: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/7.jpg)
Demonstrated ChemistriesDemonstrated Chemistries
Adsorption or co-precipitation by Adsorption or co-precipitation by Fe(III) Fe(III) hydroxides hydroxides
Biological (bacterial reduction)Biological (bacterial reduction) Reverse osmosisReverse osmosis Reduction by Fe(0) Reduction by Fe(0)
![Page 8: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/8.jpg)
Reduction with Iron MetalReduction with Iron Metal
SeOSeO44-2-2 +Fe(0) => Fe(II,III) +Se(0) +Fe(0) => Fe(II,III) +Se(0)
SeOSeO33-2-2 +Fe(0) => Fe(II,III) +Se(0) +Fe(0) => Fe(II,III) +Se(0)
![Page 9: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/9.jpg)
Selenium Species on IronSelenium Species on Iron
![Page 10: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/10.jpg)
Field TrialField TrialCatenary CoalCatenary Coal
Test in a real settingTest in a real setting
Real, variable input chemistryReal, variable input chemistry
Continuous Se InputContinuous Se Input
![Page 11: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/11.jpg)
Field Trial SystemField Trial System
![Page 12: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/12.jpg)
Field Trial SystemField Trial System
![Page 13: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/13.jpg)
0
0.005
0.01
0.015
0.02
0.025
0.03
0 50 100 150 200 250
Removal of Selenium with Iron
Influent SeEffluent SeRegulatory Limit
Se
, m
g/L
Days
![Page 14: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/14.jpg)
0
0.005
0.01
0.015
0.02
0.025
0.03
0 5 10 15 20
Selenium Removal versus Flow
Influent SeEffluent SeRegulatory Limit
Se
, m
g/L
Flow, gpm
![Page 15: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/15.jpg)
0
0.005
0.01
0.015
0.02
0.025
0.03
0 5 10 15 20
Selenium Removal versus Residence Time
Influent SeEffluent SeRegulatory Limit
Se
, m
g/L
Residence Time, hr
![Page 16: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/16.jpg)
45
50
55
60
65
70
75
80
85
0 50 100 150 200 250
Temperature Profile for Trial Period
Te
mp
era
ture
, F
Days
![Page 17: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/17.jpg)
0
0.005
0.01
0.015
0.02
0.025
0.03
45 50 55 60 65 70 75 80 85
Selenium Removal versus Temperature
Influent SeEffluent SeRegulatory Limit
Se
, m
g/L
Temperature, F
![Page 18: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/18.jpg)
Catenary Post Trial 1Catenary Post Trial 1
![Page 19: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/19.jpg)
Catenary Post Trial 2Catenary Post Trial 2
![Page 20: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/20.jpg)
Catenary Post Trial 3Catenary Post Trial 3
![Page 21: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/21.jpg)
Catenary Post Trial 4Catenary Post Trial 4
![Page 22: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/22.jpg)
Catenary Post Trial 5Catenary Post Trial 5
![Page 23: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/23.jpg)
Reduction with Iron MetalReduction with Iron Metal
PotentialPotentialRemoval of selenate and seleniteRemoval of selenate and selenitePassivePassive
ProblemsProblemsIron Oxides/ Dissolved Fe, MnIron Oxides/ Dissolved Fe, MnExhaustionExhaustionPassivationPassivationExpense (surface area)Expense (surface area)
![Page 24: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/24.jpg)
BacterialBacterialEstimated CostEstimated Cost
Flow = 285 gpmFlow = 285 gpm Capital Cost = $7.2 to $10 millionCapital Cost = $7.2 to $10 million O&M = UnknownO&M = Unknown
![Page 25: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/25.jpg)
Reverse OsmosisReverse OsmosisEstimated CostEstimated Cost
Flow = 200 gpmFlow = 200 gpm Capital Costs = $1.2 millionCapital Costs = $1.2 million O&M = $5.85 million/yearO&M = $5.85 million/year
![Page 26: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/26.jpg)
Iron HydroxideIron HydroxideEstimated CostEstimated Cost
Flow = 200 gpmFlow = 200 gpm Capital Cost = $0.69 to 1.03 millionCapital Cost = $0.69 to 1.03 million O&M = $1.39 million/yearO&M = $1.39 million/year
![Page 27: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/27.jpg)
Zerovalent IronZerovalent IronEstimated CostEstimated Cost
Flow = 250 gpm*Flow = 250 gpm* Capital costs = $478,000Capital costs = $478,000 O&M = $150,000 to $300,000O&M = $150,000 to $300,000
* Gravity flow, includes surge* Gravity flow, includes surge
![Page 28: Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP](https://reader035.fdocuments.net/reader035/viewer/2022070401/568135c1550346895d9d24f5/html5/thumbnails/28.jpg)
ConclusionsConclusions
Iron metal removes selenate and Iron metal removes selenate and selenite, but currently requires long selenite, but currently requires long
contact timescontact times Manganese and iron generatedManganese and iron generated Temperature sensitive (?)Temperature sensitive (?) Less expensive than other methodsLess expensive than other methods