NITRIFICATION OF INDUSTRIAL WASTE-WATERS WITH HIGH NITROGEN CONCENTRATION IN AERATED PACKED-BED REACTORS

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  • 1 January 1981
    • journal article
    • research article
    • Vol. 30  (3) , 259-272
Abstract
The use of a 2-step aerated packed-bed reactor yielded 99% nitrification of inorganic nitrogenous wastes carrying 800-1300 mg N/l (COD [chemical O2 demand] of the wastes 55 mg O2/l). The beds were aerated with air enriched in CO2. pH values between the units were routinely adjusted. The efficiency of nitrification was 33 mg N/l per h. A change of the composition of the wastes to nitrogenous-organic (COD 1200 mg O2/l) caused a drop in the efficiency of nitrification to 24 mg N/l per h and the subsequent introduction of a 3-step system. Concomitant COD reduction was 85% with 73% reduction occurring in the 1st bed. The number of auto- and heterotrophic bacteria in the nitrogenous-organic wastes and effluents from the separate beds was determined.