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Innovations in Passive Lime Mixing and Dissolution for Enhanced Water Treatment Efficiency

This presentation by Tim Danehy and co-authors explores a groundbreaking passive mixing technology for lime dissolution. Focused on the MixWell and A-Mixer systems, it highlights their efficiency in dissolving pebble quicklime and enhancing ferrous iron oxidation while controlling pH levels. The study showcases significant cost reductions in lime treatment and improvements in lime utilization in water treatment processes. Various chemical reactions involved in the process are discussed, emphasizing the environmental benefits and efficiency of these technologies at multiple Pennsylvania sites.

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Innovations in Passive Lime Mixing and Dissolution for Enhanced Water Treatment Efficiency

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  1. Passively-Enhanced Lime Mixing and Dissolution Presented by: Tim Danehy1 Additional Authors: B. R. Leavitt2, B. J. Page1, R. M. Mahony1, C. A. Neely1, C. F. Denholm1, S.L. Busler1, and M. H. Dunn1 1 BioMost Inc. 434 Spring Street Ext. Mars, PA 16046 2 Consulting Hydrogeologist 2776 S-Bridge Rd Washington, Pa. 15301

  2. Semi-Active Lime Dissolution Water powered Lime Dosers. Long Dissolution Channel. Lime Buildup in Channel or Ponds. Carbon Dioxide Reacts to Form Calcite.

  3. Manor Site – Clearfield County, PA Manor Erie Lecontes Mills 879 Pittsburgh Harrisburg Philadelphia

  4. Site overview

  5. Raw Water Chemistry

  6. Add Pebble Quicklime

  7. MixWellpatent pending Raw water is feed to the bottom of the MixWell. Lime or lime slurry is added to the annulus and sinks to the bottom. The lime is agitated by the raw water. Only small particles rise to the discharge.

  8. MixWell patent pending

  9. MixWell (Video)

  10. Particles Retained in MixWell

  11. Lime Particles from MixWell

  12. A-Mixerpatent pending Compressed Air supplied by Trompe. Airlift created in 12 inch pipe. Circulation in tank keeps small particles suspended. Airlift provides oxygen for iron oxidation.

  13. A-Mixer

  14. A-Mixer(Video)

  15. Lime Particles from A-Mixer

  16. Pebble Quicklime

  17. Chemical Reactions Fe+2 + ¼ O2 + H+ → Fe+3 + ½ H2O Fe+3 + 3H2O → Fe(OH)3 + 3H+ And / Or Fe(OH)2 + ½ H2O + ¼ O2 → Fe(OH)3

  18. Process Chemistry

  19. Gypsum Formation SO4 Ca

  20. Calculated Lime Efficiency Lime Measured Lime estimated Over Treating

  21. 40% Cost Reduction $30,000/yr. $18,000/yr.

  22. Conclusions • Passive mixing technology can have a very significant improvement in lime utilization where pebble lime is the source of the alkalinity. • The MixWell technology is very effective at dissolving pebble quicklime and reducing the particle size of its effluent. • The A-Mixer*, if operated at pH 7 or above, can advance the oxidation of ferrous iron while maintaining pH. (*A-Mixer can be applied at Hydrated Lime/other sites)

  23. Acknowledgement The authors gratefully acknowledge the Pennsylvania DEP, especially Mike Smith, Mario Carrelloand Eric Rosengrant for supporting our new technology. In particular we offer our thanks to Bill Gongaware of Gongaware Environmental Services and his crew who let us play with their water and supported our efforts at every turn. Thanks guys!

  24. Questions

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