Effects of ozone treatment on the biodegradability of sludge from municipal wastewater treatment plants

Authors
Yeom, ITLee, KRLee, YHAhn, KHLee, SH
Issue Date
2002-09
Publisher
IWA PUBLISHING
Citation
WATER SCIENCE AND TECHNOLOGY, v.46, no.4-5, pp.421 - 425
Abstract
The effects of ozone pretreatment on the biodegradability of municipal wastewater sludge were determined. Three types of experiments were conducted: anaerobic digestion, aerobic biodegradation, and denitrification using ozone-treated sludge as a carbon source. For 5 days, ozonated sludge at 0.1 gO(3)/g-SS showed about 2-3 times greater biodegradation compared to the raw sludge in both aerobic and anaerobic conditions. In anaerobic experiments, biodegradation increased with ozone dosage up to 0.2 gO(3)/g-SS. Further increase of ozone dosage did not improve the biodegradation. In aerobic condition, about 77% of the ozonated sludge at 0.1 gO(3)/g-SS could be biodegraded after 15 days and is compared with 36% degradation of the untreated sludge. Most of the biodegradation of the ozonated sludge occurred within 5 days while the raw sludge was biodegraded steadily throughout the experimental period. The biodegradation enhancement of ozonated sludge was confirmed in batch denitrification experiments.
Keywords
anaerobic digestion; biodegradability; ozone treatment; sludge; sludge pretreatment
ISSN
0273-1223
URI
https://pubs.kist.re.kr/handle/201004/139258
DOI
10.2166/wst.2002.0641
Appears in Collections:
KIST Article > 2002
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