Feasibility of sulfide control in sewers by reuse ofiron rich drinking water treatment sludge

Sun, Jing, Pikaar, Ilje, Sharma, Keshab Raj, Keller, Jurg and Yuan, Zhiguo (2015) Feasibility of sulfide control in sewers by reuse ofiron rich drinking water treatment sludge. Water Research, 71 150-159. doi:10.1016/j.watres.2014.12.044


Author Sun, Jing
Pikaar, Ilje
Sharma, Keshab Raj
Keller, Jurg
Yuan, Zhiguo
Title Feasibility of sulfide control in sewers by reuse ofiron rich drinking water treatment sludge
Journal name Water Research   Check publisher's open access policy
ISSN 1879-2448
0043-1354
Publication date 2015-03-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.12.044
Volume 71
Start page 150
End page 159
Total pages 10
Place of publication London, United Kingdom
Publisher IWA Publishing
Language eng
Abstract Dosage of iron salt is the most commonly used method for sulfide control in sewer networks but incurs high chemical costs. In this study, we experimentally investigate the feasibility of using iron rich drinking water treatment sludge for sulfide control in sewers. A lab-scale rising main sewer biofilm reactor was used. The sulfide concentration in the effluent decreased from 15.5 to 19.8 mgS/L (without dosing) to below 0.7–2.3 mgS/L at a sludge dosing rate achieving an iron to total dissolved inorganic sulfur molar ratio (Fe:S) of 1:1, with further removal of sulfide possible by prolonging the reaction time. In fact, batch tests revealed an Fe consumption to sulfide removal ratio of 0.5 ± 0.02 (mole:mole), suggesting the possible occurrence of other reactions involving the removal of sulfide. Modelling revealed that the reaction between iron in sludge and sulfide has reaction orders of 0.65 ± 0.01 and 0.77 ± 0.02 with respect to the Fe and sulfide concentrations, respectively. The addition of sludge slightly increased the total chemical oxidation demand (tCOD) concentration (by approximately 12%) as expected, but decreased the soluble chemical oxidation demand (sCOD) concentration and methane formation by 7% and 20%, respectively. Some phosphate removal (13%) was also observed at the sludge dosing rate of 1:1 (Fe:S), which is beneficial to nutrient removal from the wastewater. Overall, this study suggests that dosing iron-rich drinking water sludge to sewers could be an effective strategy for sulfide removal in sewer systems, which would also reduce the sludge disposal costs for drinking water treatment works. However, its potential side-effects on sewer sedimentation and on the wastewater treatment plant effluent remain to be investigated.
Keyword Drinking water treatment sludge
Integrated management
Iron
Sewer odor control
Sulfide
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Advanced Water Management Centre Publications
 
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