N-Tox® - Early warning of nitrification toxicity for activated sludge treatment
| dc.contributor.author | Callister, S. | - |
| dc.contributor.author | Stephenson, Tom | - |
| dc.contributor.author | Butler, M. D. | - |
| dc.contributor.author | Cartmell, Elise | - |
| dc.date.accessioned | 2012-04-03T23:01:45Z | |
| dc.date.available | 2012-04-03T23:01:45Z | |
| dc.date.issued | 2006-09-01T00:00:00Z | - |
| dc.description.abstract | N-Tox® is a new technique for evaluating the nitrification efficiency in industrial or municipal activated sludge systems, using direct measurement of nitrous oxide (N20) as an indicator of nitrification failure. Research using pilot-scale activated sludge plants treating real settled wastewater has demonstrated that detection of increased N2O concentration in the aeration tanks by N-Tox® is able to provide early warning of nitrification failure. The N-Tox® monitor relies on non-invasive gas-phase detection which avoids sampling of activated sludge and eliminates associated probe fouling problems and maintenance issues. Nitrification failure detection by N-Tox® is rapid, giving plant operators the time to take remedial action before possible release of ammonia. Recently presented data has shown the effectiveness of N-Tox® in providing early warning of nitrification inhibition following loss of aeration and ammonia overloading events. New data is now presented to demonstrate the effectiveness of N-Tox® in providing early warning of nitrification failure for a number of well-known toxic chemicals. These include the organic compound phenol, the nitrification suppressant allylthiourea (ATU) and the inorganic fungicide and herbicide, sodium azide. N-Tox® was able to detect nitrification failure when the first step of nitrification was inhibited, resulting in a rise in effluent ammonia, and when the second step was inhibited, resulting in a rise in effluent nitrite. The pattern of N2O emission indicated the failure mode: a sharp peak indicated ammonia breakthrough whereas a sustained increase in N2O indicated nitrite formation. The N-Tox® device can also be used to quantify emissions of N2O, a powerful greenhouse gas, from wastewater treatme | en_UK |
| dc.identifier.citation | Callister, S., Stephenson, T., Butler, M. and Cartmell, E.; N-Tox® - Early warning of nitrification toxicity for activated sludge treatment. Presented at 4th CIWEM (Chartered Institute of Water and Environmental Management) Annual Conference held 12-14 September 2006, Newcastle | - |
| dc.identifier.uri | http://dspace.lib.cranfield.ac.uk/handle/1826/1477 | |
| dc.subject | N2O | en_UK |
| dc.subject | Nitrous Oxide | en_UK |
| dc.subject | Nitrification | en_UK |
| dc.subject | Inhibition | en_UK |
| dc.subject | Toxicity | en_UK |
| dc.subject | Monitor | en_UK |
| dc.subject | Greenhouse Gas | en_UK |
| dc.title | N-Tox® - Early warning of nitrification toxicity for activated sludge treatment | en_UK |
| dc.type | Conference paper | - |