Show simple item record

dc.contributor.authorWang, Qilinen_US
dc.contributor.authorYe, Liuen_US
dc.contributor.authorJiang, Guangmingen_US
dc.contributor.authorHu, Shihuen_US
dc.contributor.authorYuan, Zhiguoen_US
dc.date.accessioned2017-05-29T12:35:10Z
dc.date.available2017-05-29T12:35:10Z
dc.date.issued2014en_US
dc.identifier.issn1879-2448en_US
dc.identifier.doi10.1016/j.watres.2014.02.029en_US
dc.identifier.urihttp://hdl.handle.net/10072/337808
dc.description.abstractNitrogen removal via nitrite (i.e. the nitrite pathway) is beneficial for carbon-limited biological wastewater treatment plants. This study presents a novel strategy for achieving the nitrite pathway, which involves recirculating a portion of the activated sludge through a side-stream sludge treatment unit, where the sludge is subject to treatment with free nitrous acid (FNA i.e. HNO2). The strategy is proposed based on a novel discovery reported in this work that in the concentration range of 0.24–1.35 mg View the MathML source–N/L, FNA is substantially more biocidal to nitrite oxidizing bacteria (NOB) than to ammonium oxidizing bacteria (AOB). Two sequencing batch reactors (SBR) treating synthetic domestic wastewater were used to demonstrate the concept, with one serving as an experimental reactor and the other as a control. In the experimental system, 22% of the sludge from the SBR was transferred to the side-stream treatment unit each day, and was subject to FNA treatment at 1.35 mg N/L for 24 h and then returned to the SBR. The nitrite pathway was rapidly (in 15 d) established in the experimental reactor with an average nitrite accumulation ratio (View the MathML source–N/(View the MathML source–N + View the MathML source–N) × 100%) of above 80%. Fluorescence in-situ hybridization demonstrated that the NOB population in the experimental reactor was 80% lower than that in the control reactor, indicating that the majority of NOB were eliminated from the experimental reactor. The FNA-based strategy for establishing the nitrite pathway substantially improved total nitrogen removal, and did not increase N2O emission or deteriorate sludge settleability. The strategy can be easily integrated with a previously demonstrated strategy, which enhances methane production through pre-treatment of secondary activated sludge, to enable maximum energy recovery while achieving improved nitrogen removal.en_US
dc.description.peerreviewedYesen_US
dc.languageEnglishen_US
dc.publisherElsevieren_US
dc.relation.ispartofpagefrom245en_US
dc.relation.ispartofpageto255en_US
dc.relation.ispartofjournalWater Researchen_US
dc.relation.ispartofvolume55en_US
dc.subject.fieldofresearchEnvironmental Biotechnology not elsewhere classifieden_US
dc.subject.fieldofresearchcode100299en_US
dc.titleSide-stream sludge treatment using free nitrous acid selectively eliminates nitrite oxidizing bacteria and achieves the nitrite pathwayen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.hasfulltextNo Full Text


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record