1 / 26

Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division

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.

dixie
Download Presentation

Treatment Options Part 1 Tom Sorg Darren Lytle Water Supply and Water Resources Division

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related