A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater

Zhang, Y; Jing, Y; Quan, X; Liu, Y; Onu, P

A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater

Zhang, Y Jing, Y Quan, X Liu, Y

Onu, P

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Publication Type:: Journal Article
Citation:: Water Science and Technology, 2011, 63 (4), pp. 741 - 746
Issue Date:: 2011-04-04

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Field	Value	Language
dc.contributor.author	Zhang, Y	en_US
dc.contributor.author	Jing, Y	en_US
dc.contributor.author	Quan, X	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Onu, P	en_US
dc.date.issued	2011-04-04	en_US
dc.identifier.citation	Water Science and Technology, 2011, 63 (4), pp. 741 - 746	en_US
dc.identifier.issn	0273-1223	en_US
dc.identifier.uri	http://hdl.handle.net/10453/117445
dc.description.abstract	Waste scrap iron was packed into an upflow anaerobic sludge blanket (UASB) reactor to form a zero valent iron (ZVI) - UASB reactor system for treatment of azo dye wastewater. The ZVI acted as a reductant to decrease ORP in the reactor by more than 40 mv and functioned as an acid buffer to increase the pH in the reactor from 5.44 to 6.29, both of which improved the performance of the anaerobic reactor. As a result, the removal of color and COD in this reactor was 91.7% and 53%, respectively, which was significantly higher than that of a reference UASB reactor without ZVI. The UV-visible spectrum demonstrated that absorption bands of the azo dye from the ZVI-UASB reactor were substantially reduced. The ZVI promoted methanogenesis, which was confirmed by an increase in CH 4 content in the biogas from 47.9% to 64.8%. The ZVI bed was protected well from rusting, which allowed it to function stably. The effluent could be further purified only by pH adjustment because the Fe 2+ released from ZVI served as a flocculent. © IWA Publishing 2011.	en_US
dc.relation.ispartof	Water Science and Technology	en_US
dc.relation.isbasedon	10.2166/wst.2011.301	en_US
dc.subject.classification	Environmental Engineering	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	Iron	en_US
dc.subject.mesh	Azo Compounds	en_US
dc.subject.mesh	Water Pollutants, Chemical	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Sewage	en_US
dc.subject.mesh	Waste Disposal, Fluid	en_US
dc.subject.mesh	Anaerobiosis	en_US
dc.subject.mesh	Hydrogen-Ion Concentration	en_US
dc.subject.mesh	Color	en_US
dc.subject.mesh	Coloring Agents	en_US
dc.title	A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	63	en_US
utslib.for	MD Multidisciplinary	en_US
utslib.for	090409 Wastewater Treatment Processes	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.declined	2017-09-21T09:35:28.954+1000
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	63	en_US

Abstract:

Waste scrap iron was packed into an upflow anaerobic sludge blanket (UASB) reactor to form a zero valent iron (ZVI) - UASB reactor system for treatment of azo dye wastewater. The ZVI acted as a reductant to decrease ORP in the reactor by more than 40 mv and functioned as an acid buffer to increase the pH in the reactor from 5.44 to 6.29, both of which improved the performance of the anaerobic reactor. As a result, the removal of color and COD in this reactor was 91.7% and 53%, respectively, which was significantly higher than that of a reference UASB reactor without ZVI. The UV-visible spectrum demonstrated that absorption bands of the azo dye from the ZVI-UASB reactor were substantially reduced. The ZVI promoted methanogenesis, which was confirmed by an increase in CH 4 content in the biogas from 47.9% to 64.8%. The ZVI bed was protected well from rusting, which allowed it to function stably. The effluent could be further purified only by pH adjustment because the Fe 2+ released from ZVI served as a flocculent. © IWA Publishing 2011.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/117445