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A comparative study of methanol as a supplementary carbon source for enhancing denitrification in primary and secondary anoxic zones

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Abstract

A comparative study on the use of methanol as a supplementary carbon source to enhance denitrification in primary and secondary anoxic zones is reported. Three lab-scale sequencing batch reactors (SBR) were operated to achieve nitrogen and carbon removal from domestic wastewater. Methanol was added to the primary anoxic period of the first SBR, and to the secondary anoxic period of the second SBR. No methanol was added to the third SBR, which served as a control. The extent of improvement on the denitrification performance was found to be dependent on the reactor configuration. Addition to the secondary anoxic period is more effective when very low effluent nitrate levels are to be achieved and hence requires a relatively large amount of methanol. Adding a small amount of methanol to the secondary anoxic period may cause nitrite accumulation, which does not improve overall nitrogen removal. In the latter case, methanol should be added to the primary anoxic period. The addition of methanol can also improve biological phosphorus removal by creating anaerobic conditions and increasing the availability of organic carbon in wastewater for polyphosphate accumulating organisms. This potentially provides a cost-effective approach to phosphorus removal from wastewater with a low carbon content. New fluorescence in situ hybridisation (FISH) probes targeting methanol-utilising denitrifiers were designed using stable isotope probing. Microbial structure analysis of the sludges using the new and existing FISH probes clearly showed that the addition of methanol stimulated the growth of specific methanol-utilizing denitrifiers, which improved the capability of sludge to use methanol and ethanol for denitrification, but reduced its capability to use wastewater COD for denitrification. Unlike acetate, long-term application of methanol has no negative impact on the settling properties of the sludge.

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Acknowledgments

The research was financially supported by the Australian Research Council (ARC), Brisbane Water, Sydney Water, Cab Water and ANOX NV (Sweden) through the ARC grant LP0347793. We are grateful for the above industry partners for their scientific and technical input into this project.

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Authors and Affiliations

  1. Advanced Water Management Centre, The University of Queensland, St. Lucia, QLD, 4072, Australia

    Maneesha P. Ginige, Jocelyn C. Bowyer, Leah Foley, Jürg Keller & Zhiguo Yuan

  2. CSIRO Land and Water, Private Bag No. 5, Wembley, WA, 6913, Australia

    Maneesha P. Ginige

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  1. Maneesha P. Ginige
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  2. Jocelyn C. Bowyer
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  3. Leah Foley
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  4. Jürg Keller
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  5. Zhiguo Yuan
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Correspondence to Zhiguo Yuan.

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Ginige, M.P., Bowyer, J.C., Foley, L. et al. A comparative study of methanol as a supplementary carbon source for enhancing denitrification in primary and secondary anoxic zones. Biodegradation 20, 221–234 (2009). https://doi.org/10.1007/s10532-008-9215-1

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  • DOI: https://doi.org/10.1007/s10532-008-9215-1

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