Abstract
Bench-scale tests have been conducted on a process using cyanobacteria to remove nutrients and utilize waste heat in nuclear reactor cooling waters. Based on its tolerance of temperature extremes, Fischerella Strain 113 was selected for semicontinuous culture studies. Cultures maintained with 10 mg L−1 daily productivity, diurnally varying temperature (55 °C to 26–28 °C), 200 μE sec−1 m−2 illumination, and 50% biomass recycling into heated effluent at the beginning of each 12-h light period, removed >95% of NO3 − + NO2 −-N, 71% of NH4 +-N, and 70% of total P. Nutrient removal was not severely impaired under conditions simulating scaled-down reactor operation, increased insolation, or dissolved inorganic carbon (DIC) limitation. Recycling biomass at the end of the light period resulted in slower growth, unimpaired NO3 − + NO2 −-N removal, 38–45% P removal, and no net NH4 + removal. Approximately 80% N removal and diurnally varying P removal (averaging 50–60%) are projected for the full-scale process.
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