Town-scale microbial sewer community and H2S emissions response to common chemical and biological dosing treatments |
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| Authors: | Elizabeth R Mathews Jennifer L Woo Dean Phillips Nathan Billington Dean Barnett Ashley E Franks |
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| Institution: | Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Australia;Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Australia;Centre for Future Landscapes, La Trobe University, Melbourne, Australia;Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Australia;Western Water, Sunbury, Australia;Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Australia;Centre for Future Landscapes, La Trobe University, Melbourne, Australia |
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| Abstract: | Controlling hydrogen sulfide (H2S) odors and emissions using a single, effective treatment across a town-scale sewer network is a challenge faced by many water utilities. Implementation of a sewer diversion provided the opportunity to compare the effectiveness of magnesium hydroxide (Mg(OH)2) and two biological dosing compounds (Bioproducts A and B), with different modes of action (MOA), in a field-test across a large sewer network. Mg(OH)2 increases sewer pH allowing suppression of H2S release into the sewer environment while Bioproduct A acts to disrupt microbial communication through quorum sensing (QS), reducing biofilm integrity. Bioproduct B reduces H2S odors by scouring the sewer of fats, oils and grease (FOGs), which provide adhesion points for the microbial biofilm. Results revealed that only Mg(OH)2 altered the microbial community structure and reduced H2S emissions in a live sewer system, whilst Bioproducts A and B did not reduce H2S emissions or have an observable effect on the composition of the microbial community at the dosed site. Study results recommend in situ testing of dosing treatments before implementation across an operational system. |
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| Keywords: | Corresponding author Microbially induced concrete corrosion Biological dosing treatments Magnesium hydroxide Hydrogen sulfide Sulfate-reducing bacteria Microbial ecology |
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