TY - JOUR
T1 - Biological nitrate removal using sugar-industry wastes
AU - Ueda, Tatsuki
AU - Shinogi, Yoshiyuki
AU - Yamaoka, Masaru
N1 - Funding Information:
Acknowledgments This study was conducted as a part of the bio-recycle research project in the Miyako Island, which was funded by the Ministry of Agriculture, Forestry and Fisheries of Japan. The authors are grateful to the members and associates of the project, particularly those living in the Miyako Island, for their kind support to this study.
PY - 2006/9
Y1 - 2006/9
N2 - Biological denitrification experiment was conducted using sugar-industry wastes, namely final molasses as a carbon source and bagasse charcoal pellets as supporting media for denitrifying bacteria. We employed an upflow fixed-bed reactor filled with the pellets and biofilm attached onto them. This was fed with potassium-nitrate and dilute-molasses solutions. Total nitrogen removals of more than 85% were achieved at influent carbon-nitrogen (C/N) ratios between 2 and 4, and hydraulic residence times of more than 0.8 h. This demonstrated that final molasses could be used as an alternative carbon source. On the other hand, final molasses also contained some organic/ammonium nitrogen and refractory organic matter including colors, both of which were difficult to remove with the reactor. Accordingly, at higher C/N ratios, these substances caused major increases in effluent total-nitrogen and organic-carbon concentrations. Therefore, an optimum C/N ratio was found to be around 2.
AB - Biological denitrification experiment was conducted using sugar-industry wastes, namely final molasses as a carbon source and bagasse charcoal pellets as supporting media for denitrifying bacteria. We employed an upflow fixed-bed reactor filled with the pellets and biofilm attached onto them. This was fed with potassium-nitrate and dilute-molasses solutions. Total nitrogen removals of more than 85% were achieved at influent carbon-nitrogen (C/N) ratios between 2 and 4, and hydraulic residence times of more than 0.8 h. This demonstrated that final molasses could be used as an alternative carbon source. On the other hand, final molasses also contained some organic/ammonium nitrogen and refractory organic matter including colors, both of which were difficult to remove with the reactor. Accordingly, at higher C/N ratios, these substances caused major increases in effluent total-nitrogen and organic-carbon concentrations. Therefore, an optimum C/N ratio was found to be around 2.
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U2 - 10.1007/s10333-006-0040-z
DO - 10.1007/s10333-006-0040-z
M3 - Article
AN - SCOPUS:33747048421
SN - 1611-2490
VL - 4
SP - 139
EP - 144
JO - Paddy and Water Environment
JF - Paddy and Water Environment
IS - 3
ER -