Title: Investigations of PAA degradation in aqueous solutions: Impacts of water hardness, salinity and DOC Authors
|Liu, Dibo -|
|Meinelt, Thomas -|
Submitted to: European Association of Fish Pathologists
Publication Type: Abstract Only
Publication Acceptance Date: September 10, 2012
Publication Date: September 19, 2012
Citation: ]Liu, D., Straus, D.L., Meinelt, T. 2012. Investigations of PAA degradation in aqueous solutions: Impacts of water hardness, salinity and DOC [abstract]. European Association of Fish Pathologists. The XIV (14th) bi-annual EAFP-Conference of the German, Austrian and Swiss Branches, September 19-21, 2012, Bautzen, Germany. p.49. Technical Abstract: Peracetic acid (PAA) is used in aquaculture under various conditions for disinfection purposes. However, there is lack of information about its environmental fate. Therefore, the impact of water hardness, salinity, and dissolved organic carbon (DOC) on PAA-degradation within 5 hours was investigated in this study. The main difference among all experimental settings was various combinations of ions in the solutions, especially the combination of Na+ and K+ with Ca2+ and Mg2+. It can be found that higher ionic complexity was positively related to the PAA degradation. For instance, sea salt caused higher PAA degradation ratio than pure NaCl. Also, a high ratio of Ca2+ and Mg2+ ions in the solution stabilized PAA, even in the presence of the Na+ and K+ ions. In conclusion, the results indicate that salinity, especially sea salt, and DOC stimulated PAA-degradation strongly. Water hardness is also likely to stabilize PAA. For scaling up, the fate of PAA has to be checked in aquaculture facilities.