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KMID : 0382420000260040082
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.82 ~ p.87
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Nutrient Release during the Aerobic and Alternant Aerobic Sludge Digestion
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Park Jong-An
Hur Joon-Moo
Kim Seong-Hong
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Abstract
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Batch digestion experiments of the biological sludge by full aeration and altemant aeration were carried out to find the release characteristics of nitrogen and phosphorus in this study. Nitrogen content of the sludge increased for the endogenous respiration period but the content gradually decreased to the same content of raw sludge. Nitrogen removal efficiency was up to 42.5% for 34 days by the altemant aerobic digestion of which aeration ratio was 0.5 and the efficiency was dependent on aeration ratio. Phosphorus released as the sludge digested and phosphorus content of the digested sludge increased because phosphorus release rate was much lower than VSS reduction rate. A new empirical equation was made based on this study. Phosphorus release rate can be estimated using this equation dependent on the VSS reduction rate and initial phosphorus content of the sludge.
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