Effect of silver in severely nitrified chloraminated bulk waters
Chloramine has been widely used in many water utilities as a secondary disinfectant because of increased concern over disinfection by-products (DBPs) formation. However, its popularity has been affected due to microbial acceleration, which is traditionally believed to be by nitrifying organisms or t...
| Main Authors: | , |
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| Format: | Journal Article |
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IWA Publishing
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/44234 |
| _version_ | 1848756940098764800 |
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| author | Bal Krishna, K Sathasivan, Arumugam |
| author_facet | Bal Krishna, K Sathasivan, Arumugam |
| author_sort | Bal Krishna, K |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Chloramine has been widely used in many water utilities as a secondary disinfectant because of increased concern over disinfection by-products (DBPs) formation. However, its popularity has been affected due to microbial acceleration, which is traditionally believed to be by nitrifying organisms or their products such as nitrite and pH value which change substantially under nitrifying conditions. With the traditional belief in mind, the conventional approach to solve 'chloramine decay' was aimed at killing or flushing out nitrifiers. We have recently shown that either soluble microbial products (SMPs) released by microbes or changes in natural organic matter (NOM) characteristics under nitrified conditions could be responsible for the acceleration. With this new insight, a new control strategy was attempted by dosing silver at a concentration of 0.1 mg-Ag/L to the nitrified bulk waters obtained in a laboratory scale system. Accelerated chemical and microbial chloramine losses were significantly reduced after the addition of silver. These results are very promising for future applications. |
| first_indexed | 2025-11-14T09:20:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-44234 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:20:10Z |
| publishDate | 2012 |
| publisher | IWA Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-442342017-09-13T16:03:55Z Effect of silver in severely nitrified chloraminated bulk waters Bal Krishna, K Sathasivan, Arumugam Mild nitrification Chloramine Silver Severe nitrification Distribution system Chloramine has been widely used in many water utilities as a secondary disinfectant because of increased concern over disinfection by-products (DBPs) formation. However, its popularity has been affected due to microbial acceleration, which is traditionally believed to be by nitrifying organisms or their products such as nitrite and pH value which change substantially under nitrifying conditions. With the traditional belief in mind, the conventional approach to solve 'chloramine decay' was aimed at killing or flushing out nitrifiers. We have recently shown that either soluble microbial products (SMPs) released by microbes or changes in natural organic matter (NOM) characteristics under nitrified conditions could be responsible for the acceleration. With this new insight, a new control strategy was attempted by dosing silver at a concentration of 0.1 mg-Ag/L to the nitrified bulk waters obtained in a laboratory scale system. Accelerated chemical and microbial chloramine losses were significantly reduced after the addition of silver. These results are very promising for future applications. 2012 Journal Article http://hdl.handle.net/20.500.11937/44234 10.2166/ws.2012.008 IWA Publishing restricted |
| spellingShingle | Mild nitrification Chloramine Silver Severe nitrification Distribution system Bal Krishna, K Sathasivan, Arumugam Effect of silver in severely nitrified chloraminated bulk waters |
| title | Effect of silver in severely nitrified chloraminated bulk waters |
| title_full | Effect of silver in severely nitrified chloraminated bulk waters |
| title_fullStr | Effect of silver in severely nitrified chloraminated bulk waters |
| title_full_unstemmed | Effect of silver in severely nitrified chloraminated bulk waters |
| title_short | Effect of silver in severely nitrified chloraminated bulk waters |
| title_sort | effect of silver in severely nitrified chloraminated bulk waters |
| topic | Mild nitrification Chloramine Silver Severe nitrification Distribution system |
| url | http://hdl.handle.net/20.500.11937/44234 |