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Title: Nitrogen behavior during sludge ozonation: a long-term observation by pilot experiments.
Authors: Sui, Pengzhe
Nishimura, Fumitake  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6669-2407 (unconfirmed)
Tsuno, Hiroshi
Keywords: nitrogen release
nitrogen removal
sludge ozonation
sludge reduction
Issue Date: Feb-2014
Publisher: IWA Publishing
Journal title: Water science and technology
Volume: 70
Issue: 2
Start page: 289
End page: 296
Abstract: Sludge ozonation is a promising technology for dealing with the increasing challenge of excess sludge treatment and disposal. However, nitrogen behavior during sludge ozonation and subsequent biological removal remains unclear. To clarify the feasibility and stability of oxidizing organic nitrogen (released during sludge ozonation) in the bioreactor (but not during ozonation), and the best operational conditions for sludge ozonation, nitrogen behavior was investigated by a long-term observation. The results showed that when inlet ozone concentration increased from 30 to 80 mg O3/L, and ozonation time decreased from 29 to 11 h, less soluble organic nitrogen was oxidized to ammonia (from 66.1 to 18.7% of soluble total nitrogen). This can reduce the operational costs of sludge ozonation. Furthermore, it is feasible to convert organic nitrogen to nitrate by biological processes because full nitrification was restored in three weeks after shock loading of organic nitrogen owing to the change in ozonation conditions. After combining sludge ozonation with the anaerobic/oxic process, the mass balance for nitrogen showed that nitrogen in the excess sludge decreased with increasing sludge reduction rate. The decreased nitrogen in the excess sludge was mainly transformed to nitrogen gas by denitrification, whereas nitrogen in the effluent did not increase noticeably.
Rights: ©IWA Publishing 2014. The definitive peer-reviewed and edited version of this article is published in 'Water Science & Technology Vol 70 No 2 pp 289–296 doi:10.2166/wst.2014.219' and is available at www.iwapublishing.com
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/200622
DOI(Published Version): 10.2166/wst.2014.219
PubMed ID: 25051476
Appears in Collections:Journal Articles

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