Journal
WATER RESEARCH
Volume 44, Issue 14, Pages 4241-4251Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2010.05.030
Keywords
Sulfide; Methane; Sulfate-reducing bacteria; Methanogen; Sewer; Nitrite; Inhibition; Recovery; Modeling
Funding
- Australian Research Council [LP0882016]
- Endeavour International Postgraduate Research Scholarship (IPRS)
- University of Queensland International Living Allowance Scholarship (UQILAS)
- Australian Research Council [LP0882016] Funding Source: Australian Research Council
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Nitrite dosing is a promising technology to prevent sulfide and methane formation in sewers, due to the known inhibitory/toxic effect of nitrite on sulfate-reducing bacteria (SRB) and methanogenic Archaea (MA). The dependency of nitrite-induced inhibition on sulfide and methane producing activities of anaerobic sewer biofilms on nitrite levels and exposure time is investigated using a range of nitrite concentrations (40, 80, 120 mg-N/L) and exposure time up to 24 days. The recovery of these activities after the 24-day nitrite dosage was also monitored for more than two months. The inhibition level was found to be dependent on both nitrite concentration and exposure time, with stronger inhibition observed at higher nitrite concentrations and/or longer exposure time. However, the time required for achieving 50% recovery of both sulfate-reducing and methanogenic activities after the cessation of nitrite dosage only marginally depended on nitrite concentration. Model-based analysis of the recovery data showed that the recovery was likely due to the regrowth of SRB and methanogens. The lab studies and mathematical analysis supported the development of an intermittent dosing strategy, which was tested in a 1-km long rising main sewer. The field trial confirmed that intermittent dosing of nitrite can effectively reduce/prevent the formation of both sulfide and methane. (C) 2010 Elsevier Ltd. All rights reserved.
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