Fate of cyanobacteria in drinking water treatment plant lagoon supernatant and sludge.
Identifieur interne : 001E97 ( Main/Curation ); précédent : 001E96; suivant : 001E98Fate of cyanobacteria in drinking water treatment plant lagoon supernatant and sludge.
Auteurs : Carlos J. Pestana [Australie] ; Petra J. Reeve [Australie] ; Emma Sawade [Australie] ; Camille F. Voldoire [France] ; Kelly Newton [Australie] ; Radisti Praptiwi [Australie] ; Lea Collingnon [France] ; Jennifer Dreyfus [Australie] ; Peter Hobson [Australie] ; Virginie Gaget [Australie] ; Gayle Newcombe [Australie]Source :
- The Science of the total environment [ 1879-1026 ] ; 2016.
Abstract
In conventional water treatment processes, where the coagulation and flocculation steps are designed to remove particles from drinking water, cyanobacteria are also concentrated into the resultant sludge. As a consequence, cyanobacteria-laden sludge can act as a reservoir for metabolites such as taste and odour compounds and cyanotoxins. This can pose a significant risk to water quality where supernatant from the sludge treatment facility is returned to the inlet to the plant. In this study the complex processes that can take place in a sludge treatment lagoon were investigated. It was shown that cyanobacteria can proliferate in the conditions manifest in a sludge treatment lagoon, and that cyanobacteria can survive and produce metabolites for at least 10days in sludge. The major processes of metabolite release and degradation are very dependent on the physical, chemical and biological environment in the sludge treatment facility and it was not possible to accurately model the net effect. For the first time evidence is provided to suggest that there is a greater risk associated with recycling sludge supernatant than can be estimated from the raw water quality, as metabolite concentrations increased by up to 500% over several days after coagulation, attributed to increased metabolite production and/or cell proliferation in the sludge.
DOI: 10.1016/j.scitotenv.2016.05.173
PubMed: 27265732
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pubmed:27265732Le document en format XML
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<front><div type="abstract" xml:lang="en">In conventional water treatment processes, where the coagulation and flocculation steps are designed to remove particles from drinking water, cyanobacteria are also concentrated into the resultant sludge. As a consequence, cyanobacteria-laden sludge can act as a reservoir for metabolites such as taste and odour compounds and cyanotoxins. This can pose a significant risk to water quality where supernatant from the sludge treatment facility is returned to the inlet to the plant. In this study the complex processes that can take place in a sludge treatment lagoon were investigated. It was shown that cyanobacteria can proliferate in the conditions manifest in a sludge treatment lagoon, and that cyanobacteria can survive and produce metabolites for at least 10days in sludge. The major processes of metabolite release and degradation are very dependent on the physical, chemical and biological environment in the sludge treatment facility and it was not possible to accurately model the net effect. For the first time evidence is provided to suggest that there is a greater risk associated with recycling sludge supernatant than can be estimated from the raw water quality, as metabolite concentrations increased by up to 500% over several days after coagulation, attributed to increased metabolite production and/or cell proliferation in the sludge.</div>
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