slide1
Download
Skip this Video
Download Presentation
Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP

Loading in 2 Seconds...

play fullscreen
1 / 28

Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP - PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on

Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP Morgantown, WV. National Mine Land Reclamation Center, West Virginia University United States Office of Surface Mining Magnum Coal Company Catenary Coal. SUPPORT. [Se] = 13 ug/L

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Selenium Removal from Mine Waters Raymond J. Lovett, Ph.D. Environmental Chemist ShipShaper, LLP' - zephr-case


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1
Selenium Removal from Mine Waters

Raymond J. Lovett, Ph.D.

Environmental Chemist

ShipShaper, LLP

Morgantown, WV

support
National Mine Land Reclamation Center, West Virginia University

United States Office of Surface Mining

Magnum Coal Company

Catenary Coal

SUPPORT
typical southern west virginia mine water
[Se] = 13 ug/L

[Fe] = 0.15 mg/L

[SO4-2]= 980 mg/L

Alkalinity = 235 mg/L as CaCO3

pH = 7.1

Typical Southern West Virginia Mine Water
problems
Problems
  • Overriding Concern
    • Regulatory limit near 5 ug/L
  • Specific Problems for Treatment
    • Low level of Se
    • Differing chemistries
      • Selenate, SeO4-2, Se(VI)
      • Selenite, SeO3-2, Se(IV)
selenium removal difficulties
Selenium Removal Difficulties
  • Different dissolved species
  • No direct precipitation chemistries
  • Reduction of selenate is difficult (slow)
  • Sulfate may interfere
treatment system objectives
Treatment System Objectives
  • Effluent maximally 5 ug/L Se
  • Low installation cost
  • Low operating cost
  • Passive
demonstrated chemistries
Demonstrated Chemistries
  • Adsorption or co-precipitation by Fe(III) hydroxides
  • Biological (bacterial reduction)
  • Reverse osmosis
  • Reduction by Fe(0)
reduction with iron metal
Reduction with Iron Metal
  • SeO4-2 +Fe(0) => Fe(II,III) +Se(0)
  • SeO3-2 +Fe(0) => Fe(II,III) +Se(0)
field trial catenary coal
Field TrialCatenary Coal

Test in a real setting

Real, variable input chemistry

Continuous Se Input

reduction with iron metal1
Reduction with Iron Metal
  • Potential
    • Removal of selenate and selenite
    • Passive
  • Problems
    • Iron Oxides/ Dissolved Fe, Mn
    • Exhaustion
    • Passivation
    • Expense (surface area)
bacterial estimated cost
BacterialEstimated Cost
  • Flow = 285 gpm
  • Capital Cost = $7.2 to $10 million
  • O&M = Unknown
reverse osmosis estimated cost
Reverse OsmosisEstimated Cost
  • Flow = 200 gpm
  • Capital Costs = $1.2 million
  • O&M = $5.85 million/year
iron hydroxide estimated cost
Iron HydroxideEstimated Cost
  • Flow = 200 gpm
  • Capital Cost = $0.69 to 1.03 million
  • O&M = $1.39 million/year
zerovalent iron estimated cost
Zerovalent IronEstimated Cost
  • Flow = 250 gpm*
  • Capital costs = $478,000
  • O&M = $150,000 to $300,000

* Gravity flow, includes surge

conclusions
Conclusions
  • Iron metal removes selenate and selenite, but currently requires long contact times
  • Manganese and iron generated
  • Temperature sensitive (?)
  • Less expensive than other methods
ad