Hydrolyzed molasses as an external carbon source in biological nitrogen removal [An article from: Bioresource Technology]

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Description:
Hydrolyzed molasses was evaluated as an alternative carbon source in a biological nitrogen removal process. To increase biodegradability, molasses was acidified before thermohydrolyzation. The denitrification rate was 2.9-3.6mg N/g VSSh with hydrolyzed molasses, in which the percentage of readily biodegradable substrate was 47.5%. To consider the hydrolysate as a carbon source, a sequencing batch reactor (SBR) was chosen to treat artificial municipal wastewater. During the 14 days (28 cycles) of operation, the SBR using hydrolyzed molasses as a carbon source showed 91.6+/-1.6% nitrogen removal, which was higher than that using methanol (85.3+/-2.0%). The results show that hydrolyzed molasses can be an economical and effective external carbon source for the nitrogen removal process.