PERCHLORATE TREATMENT UTILIZING GAC AND SAND BASED BIOLOGICAL FLUIDIZED BED REACTORS

摘要

It is believed at certain concentrations perchlorate can be detrimental to humanrnhealth. At relatively high doses, perchlorate is known to interfere with the thyroid抯rnability to produce hormones and regulate metabolism. Perchlorate contamination ofrnground water is widespread. Most perchlorate contaminated sites are associated withrncurrent or former propellant and/or rocket manufacturing and testing facilities.rnResearchers generally agree the technology that holds most promise for economicalrntreatment of perchlorate contaminated waters and wastewaters is biochemicalrntreatment. A laboratory pilot plant study was conducted involving operation ofrnbiological fluidized bed reactors (FBRs) containing either granular activated carbonrn(GAC) or sand as the fluid bed media, treating perchlorate contaminated water orrnground water. Ethanol, methanol or mixtures of the two alcohols were fed to the FBRsrnas electron donors to promote perchlorate reduction. Results from the study impliedrnmethanol was not effective as an electron donor. GAC and sand based FBRs bothrnachieved significant perchlorate reduction with GAC exhibiting superior performance.rnAn ethanol-methanol mixture appeared to be equally effective as an electron donor asrnethanol alone in promoting perchlorate reduction. The FBR technology for perchloraternremoval was demonstrated at the full scale level through operation of 2, 4.27 m, GACrnbased FBRs with ethanol added as the electron donor.