STUDIES ON PURIFICATION OF WASTES FROM NITROGEN-FERTILIZER INDUSTRY BY INTENSIVE ALGAL CULTURES .4. GROWTH OF CHLORELLA-VULGARIS IN WASTES WITH HIGH NITROGEN-CONTENT IN CONTINUOUS AND INTERMITTENT LIGHT

  • 1 January 1977
    • journal article
    • research article
    • Vol. 26  (1) , 79-93
Abstract
The growth and utilization of N by intensive C. vulgaris in wastes from production of urea, containing 1300 mg NH4+-N and 4000 mg urea-N/l was investigated. In these conditions only C. vulgaris AA strain, adapted to high concentrations of NH4+-N can grow. The elimination of N by continuous cultures was 750 mg urea-N/l with a 5 day flow rate. A considerable part of the urea was hydrolyzed by urease bacteria and removed in the form of NH3. The effect of intermittent light on the growth of algae was also studied. A better growth than in continuous light was obtained with alternate 1 h periods of light and darkness. Good results were also obtained with 12 h light and 12 h darkness. [This process also yields large amounts of biomass with high protein content.].

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