Abstract
Free nitrous acid (FNA) was previously demonstrated to be biocidal to anaerobic sewer biofilms. The intermittent dosing of FNA as a measure for controlling sulfide and methane productions in sewers is investigated. The impact of three key operational parameters namely the dosing concentration, dosing duration and dosing interval on the suppression and subsequent recovery of sulfide and methane production was examined experimentally using lab-scale sewer reactors. FNA as low as 0.26. mg-N/L was able to suppress sulfide production after an exposure of 12. h. In comparison, 0.09. mg-N/L of FNA with 6-h exposure was adequate to restrain methanogenesis effectively. The recovery of sulfide production was well described by an exponential recovery equation. Model-based analysis revealed that 12-h dosage at an FNA concentration of 0.26. mg-N/L every 5 days can reduce the average sulfide production by >80%. Economic analysis showed that intermittent FNA dosage is potentially a cost-effective strategy for sulfide and methane control in sewers. © 2011 Elsevier Ltd.
| Original language | English |
|---|---|
| Pages (from-to) | 6163-6172 |
| Journal | Water Research |
| Volume | 45 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 15 Nov 2011 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Funding
The authors acknowledge the Sewer Corrosion and Odour Research (SCORe) Project LP0882016 funded by an Australian Research Council Industry Linkage Project Grant and supported financially and in-kind by key members of the Australian water industry and acknowledge the other University Research Partners (for more details see: www.score.org.au). Guangming Jiang is grateful to the scholarships: Endeavour International Postgraduate Research Scholarship (IPRS) and University of Queensland International Living Allowance Scholarship (UQILAS).
Research Keywords
- Biocidal effect
- Free nitrous acid
- Intermittent dosing
- Methane
- Modeling
- Nitrite
- Recovery
- Sewer
- Sulfide
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