| US 7,575,686 B2 | ||
| Process for autotrophic perchlorate reduction using elemental sulfur and mollusk shells | ||
| Sukalyan Sengupta, N. Dartmouth, Mass. (US); Sarina Ergas, Amherst, Mass. (US); Klaus Nüsslein, Amherst, Mass. (US); and Ashish Sahu, Amherst, Mass. (US) | ||
| Assigned to University of Massachusetts, Boston, Mass. (US) | ||
| Filed on Dec. 22, 2006, as Appl. No. 11/645,152. | ||
| Claims priority of provisional application 60/753992, filed on Dec. 23, 2005. | ||
| Prior Publication US 2007/0267346 A1, Nov. 22, 2007 | ||
| Int. Cl. C02F 3/00 (2006.01) | ||
| U.S. Cl. 210—617 [210/902] | 36 Claims |
| 1. A method for treating liquid from a source to reduce perchlorate concentration in the liquid, comprising:
supplying inlet liquid from a liquid source, the liquid having a first perchlorate concentration,
delivering a liquid into a bioreactor having a cavity and at least one inlet and at least one outlet opening connecting to
the cavity, the bioreactor having a packed media comprising a plurality of granules of electron donor material and pieces
of mollusk shell buffer material having at least 90% calcium carbonate by weight, positioned in the bioreactor cavity such
that a liquid passing through the bioreactor cavity makes fluid contact with the media and such that the pieces of mollusk
shell material are in fluid communication with the granules of electron donor material, the media being seeded with a sludge
containing bacteria,
forming a treated liquid having a second perchlorate concentration less than the first, and
passing the treated liquid out of the bioreactor outlet opening.
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