REMOVAL OF NITROGEN FROM INDUSTRIAL WASTEWATERS BY 3-STEP NITRIFICATION AND DENITRIFICATION

  • 1 January 1979
    • journal article
    • research article
    • Vol. 28  (4) , 301-309
Abstract
The removal of N from industrial waste waters carrying about 1000 mg NH4-N and urea-N/l was investigated on a laboratory scale. The use of a 3-step nitryfying activated sludge with adjustment of pH from step to step resulted in 99% oxidation of both forms of N to nitrites. The efficiency of nitrification was 18 mg N/l/h. Total time of waste water aeration depended on N concentration and was 33-54 h. Complete denitrification of NO2-N was obtained in packed-bed reactor with the use of acetic acid as a C source. Efficiency of denitrification was 361 mg N/l/h.