Comparison of the Effects of Conventional and Alternative External Carbon Sources on Enhancing the Denitrification Process
Abstract:The aim of this study was to determine the immediate effects of dosing different carbon sources on the denitrification capability of the process biomass from the “Wschod” WWTP in Gdansk (Poland). Five carbon sources, including the settled wastewater, methanol and three industrial effluents (distillery, brewery and fish-pickling process) were tested in two kinds of batch experiments. The acclimation period of biomass to methanol was also investigated in bench scale systems. During the “conventional” batch experiments with the industrial effluents the observed nitrate utilization rates (NURs) ranged from 2.4 to 6.0 g N/(kg VSS·h). For comparison, the rates associated with the utilization of readily biodegradable fraction in the settled wastewater were 4.6-7.8 g N/(kg VSS·h). The “conventional” NURs observed with methanol and non-acclimated process biomass were very low, i.e. 0.4-1.5 g N/(kg VSS·h), and a minimum two week acclimation period was needed to reach the level of 4.0 g N/(kg VSS·h).
Document Type: Research Article
Publication date: January 1, 2008
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