Hydrolyzed molasses as an external carbon source in biological nitrogen removal.
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.
Quan
Zhe-Xue
ZX
Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Jin
Yin-Shu
YS
Yin
Cheng-Ri
CR
Lee
Jay J
JJ
Lee
Sung-Taik
ST
D001673:Biodegradation, Environmental; D019149:Bioreactors; D006868:Hydrolysis; D007723:Korea; D008965:Molasses; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D009566:Nitrates; D014874:Water Pollutants, Chemical