Hydrolyzed molasses as an external carbon source in biological nitrogen removal |
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Authors: | Quan Zhe-Xue Jin Yin-Shu Yin Cheng-Ri Lee Jay J Lee Sung-Taik |
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Affiliation: | Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea. |
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Abstract: | 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 2.9-3.6 mg 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. |
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