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dc.contributor.authorWang, Yali
dc.contributor.authorZhao, Jianwei
dc.contributor.authorWang, Dongbo
dc.contributor.authorLiu, Yiwen
dc.contributor.authorWang, Qilin
dc.contributor.authorNi, Bing-Jie
dc.contributor.authorChen, Fei
dc.contributor.authorYang, Qi
dc.contributor.authorLi, Xiaoming
dc.contributor.authorZeng, Guangming
dc.contributor.authorYuan, Zhiguo
dc.date.accessioned2019-07-11T03:03:46Z
dc.date.available2019-07-11T03:03:46Z
dc.date.issued2018
dc.identifier.issn0043-1354
dc.identifier.doi10.1016/j.watres.2018.08.011
dc.identifier.urihttp://hdl.handle.net/10072/382634
dc.description.abstractSimultaneous sludge fermentation and nitrite removal is an effective approach to enhance nutrient removal from low carbon-wastewater. It was found in this work that the presence of nitrite largely promoted hydrogen production from acidic fermentation of waste activated sludge (WAS). The results showed that with an increase of nitrite from 0 to 250 mg/L, the maximal hydrogen yield increased from 8.5 to 15.0 mL/g VSS at pH 5.5 fermentation and 8.1–13.0 mL/g VSS at pH 6 fermentation. However, the maximal hydrogen yield from WAS fermentation at pH 8 remained almost constant (2.9–3.7 mL/g VSS) when nitrite was in the range of 0–250 mg/L. Further analyses revealed that free nitrous acid (FNA) rather than nitrite was the major contributor to the promotion of hydrogen yield. The mechanism investigations showed that FNA not only accelerated the disruption of sludge cells but also promoted the biodegradability of organics released, thereby provided more biodegradable substrates for subsequent hydrogen production. Although FNA inhibited activities of all microbes involved in the anaerobic fermentation, its inhibitions to hydrogen consumers were much severer than those to hydrolytic microorganisms and hydrogen producers. Further investigations with microbial community showed that FNA increased the abundances of hydrogen producers (e.g., Citrobacter sp.) and denitrifiers (e.g., Dechloromonas sp.), but reduced the abundances of hydrogen consumers (e.g., Clostridium_aceticum). This work demonstrated for the first time that FNA in WAS fermentation systems enhanced hydrogen production. The findings obtained expand the application field of FNA and may provide supports for sustainable operation of wastewater treatment plants.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeUnited Kingdom
dc.relation.ispartofpagefrom113
dc.relation.ispartofpageto124
dc.relation.ispartofjournalWater Research
dc.relation.ispartofvolume145
dc.subject.fieldofresearchWater Resources Engineering
dc.subject.fieldofresearchcode090509
dc.titleFree nitrous acid promotes hydrogen production from dark fermentation of waste activated sludge
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dcterms.licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyright© 2018 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
gro.hasfulltextFull Text
gro.griffith.authorWang, Qilin


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