Biological Nitrogen Removal Using the Supernatant of Ozonized Sludge as Extra Carbon Source |
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| Authors: | Shuo Yang Tao Zhang Peng Li Chuanfu Wu |
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| Affiliation: | 1. School of Civil and Environmental Engineering , University of Science &2. Technology Beijing , Beijing, 100083, China;3. Technology Beijing , Beijing, 100083, China;4. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing, 100085, China |
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| Abstract: | A sludge ozonation process with lab-scale anaerobic/oxic (A/O) system was used to investigate the utilization of the ozonized sludge (OS) supernatant as extra carbon source for denitrification. The optimal ozone dose for the sludge ozonation was 0.2 gO3/gSS. The concentrations of SCOD, BOD, NH3-N and TN in the supernatant increased respectively at this ozone dose. In the meantime, the sludge was significantly reduced. The OS supernatant had negative effect on nitrification because of low pH and alkalinity. After alkalinity adjustment, the A/O with the OS supernatant as the extra carbon source achieved a nitrogen removal rate of 78%, which was very close to the control experiment using glucose (79%). |
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| Keywords: | Ozone Sludge Wastewater Nitrogen Removal Low Carbon Source |
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