Ferrous salt demand for sulfide control in rising main sewers: Tests on a laboratory-scale sewer system

Zhang, Lishan, Keller, Jurg and Yuan, Zhiguo (2010) Ferrous salt demand for sulfide control in rising main sewers: Tests on a laboratory-scale sewer system. Journal of Environmental Engineering-asce, 136 10: 1180-1187. doi:10.1061/(ASCE)EE.1943-7870.0000258

Author Zhang, Lishan
Keller, Jurg
Yuan, Zhiguo
Title Ferrous salt demand for sulfide control in rising main sewers: Tests on a laboratory-scale sewer system
Journal name Journal of Environmental Engineering-asce   Check publisher's open access policy
ISSN 0733-9372
Publication date 2010-10-01
Sub-type Article (original research)
DOI 10.1061/(ASCE)EE.1943-7870.0000258
Volume 136
Issue 10
Start page 1180
End page 1187
Total pages 8
Place of publication Reston, VA., U.S.
Publisher American Society of Civil Engineers
Language eng
Formatted abstract
The addition of ferrous salts is a commonly used strategy for sulfide control in sewer networks. The Fe2+ dosing requirement in rising main sewers which takes into account of the effect of anaerobic sewer biofilms on the dosing demand is investigated. A laboratory-scale rising main sewer, consisting of four biofilm reactors in series and fed with real sewage, was operated for over 12 months, during which FeCl2 was dosed at several locations and at various dosing rates. The experimental results consistently revealed that approximately 0.7 mol of Fe2+ was required to precipitate sulfide formed from the reduction of 1 mol of sulfate by anaerobic sewer biofilms. This ratio is significantly lower than the ratio expected from reaction stoichiometry (molar ratio of 1:1), and also the Fe2+ to sulfide ratio (1.07–1.10 mol:1 mol) observed in batch tests conducted with real wastewater in the absence of sewer biofilms. Biofilms adapted to Fe2+ addition were found to contain a substantially higher amount of elemental sulfur than biofilms not receiving Fe2+ dosage. This suggests Fe2+ addition might have altered the final product of sulfate reduction by anaerobic sewer biofilms. The study also showed that the addition of ferrous salts at the inlet of a rising main sewer can effectively control sulfide throughout the whole system despite of the presence of competing anions in wastewater. Phosphate precipitation with ferrous iron in anaerobic rising main sewers is negligible.

©2010 ASCE
Keyword Ferrous iron
Rising main
125 Degrees-c
Pyrite Formation
H2s Oxidation
Iron Salts
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Submitted 6 October 2009; accepted 13 April 2010; posted ahead of print 20 April 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Advanced Water Management Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 17 Oct 2010, 10:07:26 EST