It has been demonstrated, that the elimination of triclosan is very effective in wastewater treatment with eliminination rates > 90%. However, a persistent transformation product (triclosan-methyl) is beeing formed in the activated sludge treatment process. In contrast to other studies, mass balances on wastewater treatment plants show that the fate of more than 50% of the incoming triclosan remains unknown.
In this study we will present data on which part of the treatment process (BOD removal, nitrogen removal, phosphorus removal, i.e., aerobic-, nitrate reducing- and anaerobic conditions) is the most relevant for the elimination of triclosan as well as the formation of triclosan-methyl. Kinetic data for the different steps and conditions are being presented. Also we investigated the fate of the unknown mass fraction of triclosan in reactor experiments. Some results from full scale treatment plants will be given as well as first indications on how to decrease emissions of triclosan and triclosan-methyl in current wastewater treatment processes.
While the aerobic conditions seem to be preferential for the degradation of triclosan, no drirect clues are available yet for the formation of triclosan-methyl.Keywords: Triclosan, wastewater treatment, bio-methylation
|Publication status||Published - 2009|
|Event||ASPD 5 Specialised conference on Microbial population dynamics in Biological Waste water treatment - , Denmark|
Duration: 24 May 2009 → 27 May 2009
|Conference||ASPD 5 Specialised conference on Microbial population dynamics in Biological Waste water treatment|
|Period||24/05/2009 → 27/05/2009|