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In early July 2003, Carollo Engineers initiated a six-month pilot study at the Castaic Lake WaterAgency (Santa Clarita, California). The ultimate goal of this project was to demonstrate the efficacy offixed-bed biological treatment for perchlorate removal from Saugus aquifer water (i.e., showconsistent removal of perchlorate to below the method detection limit of 4 mg/L). Specificobjectives of the project were to:verify that sufficient perchlorate-reducing biological activity can be developed in the pilot-scalereactors using microorganisms indigenous to the Saugus aquifer;develop full-scale design criteria for empty-bed contact time (EBCT), backwashingprocedures, electron donor (acetic acid) addition, and nutrient addition; evaluate the robustness of the fixed-bed biological process with respect to system upsets,such as electron donor feed failure, process shut-downs, and spikes in the feedwater oxidantconcentrations; and, determine post-treatment requirements for the fixed- and fluidized-bed perchlorate removalprocesses (i.e., characterize process effluent quality). Results demonstrated that a perchlorate-reducing, fixed-bed biological reactor can be acclimatedusing organisms indigenous to the Saugus aquifer, that perchlorate can be removed to belowdetection using reasonable contact times, and that effluent water from these processes is of fairlyhigh quality. Ultimately, the results of this project will be used to evaluate the feasibility andcosts associated with treating perchlorate-laden Saugus aquifer water using both fixed- andfluidized-bed biological reactors.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 4File Size: 1 file , 230 KB