ESEL Paper Review_20115015
 
By Hong Guo

1,Title and Author

Title: Monitoring organic loading to swimming pools by fluorescence excitation-emission matrix with parallel factor analysis (PARAFAC)

Authors: Bozena Seredynska-Sobeckaa, Colin A.Stedmonb, Rasmus Boe-Hansenc, Christopher K. Waula, Erik Arvina, *

aDepartment of Environmental Engineering, Technical University of Denmark, Miljoevej, Building 113, 2800 Kgs, Lyngby, Denmark
bDepartment of Marine Ecology, National Environmental Research Institute, Aarhus University, Frederiksborjvej 399,
cKruger A/S, Gladsaxevej 363, 2860 Soborg, Denmark

2. Summary of Paper
  In this paper, the author use the fluorescence excitation-emission matrices of swimming pool organic matter were evaluated by PARAFAC modeling which delivered information on both qualitative an quantitative aspects of the obtained fluorescence signal.
2.1PARAFAC components and correlation to wastewater addition
  The author set the 5 different components which are (a) cold water pool (b) warm water pool sample with 0.75%additionof waste water (c) MQ water with 0.75 % addition of waste water (d) warm water pool  
  The results showed that among the 5 components (the author found typically 5components in the swimming pool), the best linear relation ship between wastewater concentration and fluorescence was found for component 4(Excitation wave length <240nm, Emission wavelength: 370nm) and component 5(Excitation wave length <240,310nm, Emission wavelength: 360nm) give the best association with swimming pool organic matter. Actually, the component 5 is between protein-like and humic-like. Thus we can know that this one is a something that has both the microbial activity products and humic-like substances.
2.2 Daily variability of fluorescence in the swimming pool
  During the days, the components4 shows the biggest increase trend but the component 3 is above the detection limit all the time. Component 5 also show the organic matter-peak, but there is no systematic. 1,2 are under the detection limit
2.3 Monitoring organic matter loading and accumulation in swimming pool water. 
  The component 3 is very stable in the warming pool but becomes oxidized during the night when the organic loading to the pool has stopped. And here we also consider that the higher temperature means more organic matters from the human body.
  The component 5 here shows that it is produced in chemical more than microbial reactions in the swimming pool water.
2.4 Wastewater detection limit
  The detection limits of wastewater in the swimming water were calculated for all the wastewater components, and it shows that the lowest detection limit was the component 4 and the highest one is the component 1.

3.Contribution:
   As we know, the fluorescence has a potential for the monitoring water quality. In this paper, the author discussed about the monitoring of the swimming poor-a new area of fluorescence detection area. As a conclusion, we know that the components 3(Excitation wavelength <240,330; Emission wavelength 420nm) is very good indicator for anthropogenic release to swimming pool. And I also think for the semi-closed the system, it also can be used as the indicator. (Just my prediction. It is need to proved)