Impact of reduced water consumption on sulfide and methane production in rising main sewers

Journal of Environmental Management
Jing SunZhiguo Yuan

Abstract

Reduced water consumption (RWC), for water conservation purposes, is expected to change the wastewater composition and flow conditions in sewer networks and affect the in-sewer transformation processes. In this study, the impact of reduced water consumption on sulfide and methane production in rising main sewers was investigated. Two lab-scale rising main sewer systems fed with wastewater of different strength and flow rates were operated to mimic sewers under normal and RWC conditions (water consumption reduced by 40%). Sulfide concentration under the RWC condition increased by 0.7-8.0 mg-S/L, depending on the time of a day. Batch test results showed that the RWC did not change the sulfate-reducing activity of sewer biofilms, the increased sulfide production being mainly due to longer hydraulic retention time (HRT). pH in the RWC system was about 0.2 units lower than that in the normal system, indicating that more sulfide would be in molecular form under the RWC condition, which would result in increased sulfide emission to the atmosphere as confirmed by the model simulation. Model based analysis showed that the cost for chemical dosage for sulfide mitigation would increase significantly per unit volume of sewage, although the...Continue Reading

References

Nov 9, 2007·Water Research·Albert GuisasolaZhiguo Yuan
Mar 1, 2008·Water Science and Technology : a Journal of the International Association on Water Pollution Research·L Sutherland-StaceyG Hamilton
Mar 14, 2008·Water Research·Keshab Raj SharmaJurg Keller
May 9, 2009·Water Research·Albert GuisasolaZhiguo Yuan
Nov 26, 2009·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jeff FoleyPaul Lant
Oct 25, 2011·Water Research·Ramon GanigueZhiguo Yuan
Jan 27, 2012·Water Science and Technology : a Journal of the International Association on Water Pollution Research·N MarleniN Muttil
Sep 7, 2014·Applied and Environmental Microbiology·Jing SunZhiguo Yuan

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Citations

May 11, 2016·Environmental Science & Technology·Zeyad AlshboulAndreas Lorke
Mar 14, 2008·Water Research·Keshab Raj SharmaJurg Keller

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