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Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division Office of Research and Develo

Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division Office of Research and Development U.S. Environmental Protection Agency Cincinnati, OH. Topics – Part 1. Arsenic Chemistry BAT Technology Adsorptive Media. Arsenic Chemistry.

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Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division Office of Research and Develo

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  1. Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division Office of Research and Development U.S. Environmental Protection Agency Cincinnati, OH

  2. Topics – Part 1 • Arsenic Chemistry • BAT Technology • Adsorptive Media

  3. Arsenic Chemistry Arsenic Species As (III) - H3AsO30, H2AsO3-1 , HAsO3-2 As (V) - H3AsO40 , HAsO4-1, AsO4-2

  4. Arsenic Chemistry • What is the significance of arsenic speciation? • As V more effectively removed than As III • by most treatment technologies

  5. Arsenic Occurrence • Surface waters - predominantly As (V) • Ground waters – usually found as As (III), however, it can As (V) or a combination of • As (III) and As (V).

  6. Arsenic Chemistry For maximum As removal oxidize As (III) to As (V) before applying treatment

  7. As III Oxidation Effective! • Free Chlorine • Potassium Permanganate • Ozone • Solid Oxidizing Media (MnO2 solids) Ineffective • Chloramine • Chlorine Dioxide • UV Radiation

  8. Oxidation of As III by aeration not effective

  9. Topics – Part 1 • Arsenic Chemistry • BAT Technology • Adsorptive Media

  10. Arsenic Rule Best Available Technology (BAT) TechnologyMaximum Percent Removal (As V) Ion Exchange 95 Activated Alumina 90 Reverse Osmosis >95 Modified Coag/Filtration 95 Modified Lime Softening 80 Electrodialysis Reversal 85 Oxidation/Filtration (20:1 Fe/As) 80

  11. Arsenic Rule Other Ground Water Processes TechnologyReason for not beinglisted as BAT Coagulation Assisted No full scale history Microfiltration Granular Ferric Lack of published data Hydroxide (GFH)

  12. Arsenic Rule • Small Systems Compliance Technologies • Centralized Treatment – IE, AA, MC/F, MLS, Fe Removal • POU - RO, Activated Alumina • POE – Activated Alumina

  13. Topics – Part 1 • Arsenic Chemistry • BAT Technology • Adsorptive Media

  14. Arsenic Demonstration Program – Round 1 Technologies selected for demonstration (12 sites) Adsorptive media – 9 Iron media – 7 (E 33, Sorb 33, GFH) Iron based media – 1 (G2) Modified activated alumina –1 (AAFS 50) Ion exchange – 1 (As & NO3) Iron removal – 1 Treatment modification (iron removal process) - 1

  15. Adsorptive Media Processes • Advantages • Simple process • High removal capacity • Non hazardous waste products • Low cost

  16. Adsorptive Media Treatment • Disadvantages • Removal capacity impacted by water chemistry, such as pH • pH adjustment may be required • Media replacement

  17. Adsorptive Media Treatment • Key design factors • Media • Bed configuration

  18. Adsorptive Media Listed in NSF/ANSI STD 61

  19. Adsorptive Media System Designs Simple 1, 2, or 3 beds in parallel

  20. Adsorptive Media System Design A A Roughing filter Polishing filter B B Series Design

  21. Activated Alumina System - New Hampshire

  22. Adsorptive Media Treatment

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