Perchlorate is a major groundwater contaminant that is derived mostly from anthropogenic activities. As more sensitive analytical techniques were developed, perchlorate was detected in groundwater throughout the United States. Due to the possibility of adverse health effects, the U.S. Environmental Protection Agency recently set the perchlorate reference dose to 0.0007 mg/kg/day, which corresponds to a drinking water equivalent level of 24.5 ppb. In this research, a novel up-flow microbial reactor was constructed and operated to evaluate its effectiveness on the removal of high perchlorate concentrations in a synthetic wastewater containing acetate (600 mg/L) as the primary source of electrons. Batch kinetic tests were conducted to determine optimum flow rate for perchlorate removal. A flow rate of 150 mL/min sufficiently expanded bacteria matrices and provided the optimum perchlorate removal rate. A fluidized bed reactor (FBR), using granular activated carbon as attachment medium, was operated in parallel to compare the performance of the novel up-flow bioreactor to FBR process. In the fluidized bed reactor, twenty percent bed expansion was achieved at a flow rate of 780 mL/min. Batch perchlorate removal in both reactors followed first order kinetics and the first order removal rate constant for the up-flow reactor (k = -0.0654 min-1) was substantially higher than that of FBR (k = -0.0385 min-1).Due to the possibility of adverse health effects, the U.S. Environmental Protection Agency recently set the perchlorate reference dose to 0.0007 mg/kg/day, which corresponds to a drinking water equivalent level of 24.5 ppb. In this research, aanbsp;...
|Title||:||Design and Operation of Novel Up-flow Bioreactor for Microbial Perchlorate Removal|
|Publisher||:||ProQuest - 2008|