Patent ID: 7575686
Filing Date: 2009-08-18
Classification: C02F,Y02W,Y10S

Abstract:
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.