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The study has assessed the denitrification performance of fermented and dark-fermented biosolids as external carbon sources using lab-scaled Sequencing Batch Reactors (SBRs). This was done by adding fermented and dark-fermented biosolids into anoxic zones of two SBRs, and then assessing the change of effluent characteristics comparing to before adding and to a third controlled reactor. The results showed that by adding 150-170 mg rbCOD/L of either of the selected fermented biosolids, almost complete denitrification could be reached for tested SBRs (reduced from initial ~20 mg NO3/L to < 1 mg NO3/L). Finally, the experiment also found that the impact of NH4 components of fermented and dark-fermented biosolids onto the final effluent were much lesser than expected, where only less than 2.5 mg NH4/L were detected in the effluent, much lower than the added 5.0-5.7 mg/L.

Assess the Denitrification Performance of Fermented and Dark-fermented Biosolids as External Carbon Sources Using Sequence Batch Reactors (SBRS)