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Ozonolysate of excess sludge as a carbon source in an enhanced biological phosphorus removal for low strength wastewater |
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| Authors: | Park K Y Lee J W Song K G Ahn K H |
| Affiliation: | a Department of Civil and Environmental System Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, South Korea b Department of Environmental Engineering, Korea University, Jochiwon-eup, Chunngnam 339-700, South Korea c Water Environment and Remediation Research Center, Korea Institute of Science and Technology (KIST), P.O. Box 131 Cheongryang, Seoul 136-650, South Korea |
| Abstract: | Potential use of the municipal sludge ozonolysate as a carbon source was examined for phosphorus removal from low strength wastewater in a modified intermittently decanted extended aeration (IDEA) process. At ozone dosage of 0.2 g O3/g solids, readily biodegradable COD accounted for about 36% of COD from sludge ozonolysate. The denitrification potential of ozonolysate as a carbon source was comparable to that of acetate. Although, the first order constant for phosphorus release with the ozonolysate was half that of acetate, it was much higher than that of wastewater. Continuous operation of the modified IDEA process showed that the removals of nitrogen and phosphorus were simultaneously enhanced by addition of the ozonolysate. Phosphorus release was significantly induced after complete denitrification indicating that phosphorus release was strongly depended on nitrate concentration. Effectiveness of the ozonolysate as a carbon source for EBPR was also confirmed in a track study of the modified IDEA. |
| Keywords: | Intermittently decanted extended aeration (IDEA) process Carbon source Enhanced biological phosphorus removal Ozonolysate Waste activated sludge |
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