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Sulfide and methane production in sewer sediments

Recent studies have demonstrated significant sulfide and methane production by sewer biofilms, particularly in rising mains. Sewer sediments in gravity sewers are also biologically active; however, their contribution to biological transformations in sewers is poorly understood at present. In this study, sediments collected from a gravity sewer were cultivated in a laboratory reactor fed with real wastewater for more than one year to obtain intact sediments. Batch test results show significant sulfide production with an average rate of 9.20±0.39gS/m2·d from the sediments, which is significantly higher than the areal rate of sewer biofilms. In contrast, the average methane production rate is 1.56±0.14g CH4/m2·d at 20°C, which is comparable to the areal rate of sewer biofilms. These results clearly show that the contributions of sewer sediments to sulfide and methane production cannot be ignored when evaluating sewer emissions. Microsensor and pore water measurements of sulfide, sulfate and methane in the sediments, microbial profiling along the depth of the sediments and mathematical modelling reveal that sulfide production takes place near the sediment surface due to the limited penetration of sulfate. In comparison, methane production occurs in a much deeper zone below the surface likely due to the better penetration of soluble organic carbon. Modelling results illustrate the dependency of sulfide and methane productions on the bulk sulfate and soluble organic carbon concentrations can be well described with half-order kinetics

Ramon Ganigu e gratefully acknowledges support from Beatriu de Pin os fellowship (BP-2011-B) and FP7 Marie Curie Career Integration Grants (PCIG13-GA-2013-618593)

© Water Research, 2015, vol. 70, p. 350-359

Elsevier

Author: Liu, Yiwen
Ni, Bing Jie
Ganigué Pagès, Ramon
Werner, Ursula
Sharma, Keshab R.
Yuan, Zhiguo
Date: 2015 March 1
Abstract: Recent studies have demonstrated significant sulfide and methane production by sewer biofilms, particularly in rising mains. Sewer sediments in gravity sewers are also biologically active; however, their contribution to biological transformations in sewers is poorly understood at present. In this study, sediments collected from a gravity sewer were cultivated in a laboratory reactor fed with real wastewater for more than one year to obtain intact sediments. Batch test results show significant sulfide production with an average rate of 9.20±0.39gS/m2·d from the sediments, which is significantly higher than the areal rate of sewer biofilms. In contrast, the average methane production rate is 1.56±0.14g CH4/m2·d at 20°C, which is comparable to the areal rate of sewer biofilms. These results clearly show that the contributions of sewer sediments to sulfide and methane production cannot be ignored when evaluating sewer emissions. Microsensor and pore water measurements of sulfide, sulfate and methane in the sediments, microbial profiling along the depth of the sediments and mathematical modelling reveal that sulfide production takes place near the sediment surface due to the limited penetration of sulfate. In comparison, methane production occurs in a much deeper zone below the surface likely due to the better penetration of soluble organic carbon. Modelling results illustrate the dependency of sulfide and methane productions on the bulk sulfate and soluble organic carbon concentrations can be well described with half-order kinetics
Ramon Ganigu e gratefully acknowledges support from Beatriu de Pin os fellowship (BP-2011-B) and FP7 Marie Curie Career Integration Grants (PCIG13-GA-2013-618593)
Format: application/pdf
ISSN: 0043-1354 (versió paper)
1879-2448 (versió electrònica)
Document access: http://hdl.handle.net/10256/13210
Language: eng
Publisher: Elsevier
Collection: Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.watres.2014.12.019
Articles publicats (D-EQATA)
info:eu-repo/grantAgreement/EC/FP7/618593
Is part of: © Water Research, 2015, vol. 70, p. 350-359
Rights: Tots els drets reservats
Subject: Clavegueram
Sewerage
Title: Sulfide and methane production in sewer sediments
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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