| Title |
Monitoring of COD as organic indicator in waste water and treated effluent by fluorescence excitation-emission matrix (FEEM) characterization |
| Authors |
이석헌 ( Seock Heon Lee ) ; 김종석 ( Jong Seok Kim ) ; 안규홍 ( Kyu Hong Ahn ) |
| Abstract |
The fluorescence excitation-emmission matrix (FEEM) of domestic waste water, treated effluent of waste water treatment plant, and receiving river water was analyzed to select wavelengths for the monitoring of organic contents as COD. 220 nm/350 nm and 270 nm/350 nm of excitation/emission wavelength for protein-like fluorescence and 240 mm/450 nm and 340 nm/450 nm for humic acid-like fluorescence were suggested as fluorescence peak emitting wavelength pairs, respectively. Without any pre-treatment, protein-like fluorescence peak showed better correlations between COD values and fluorescence intensities than humic acid-like fluorescence peak does. No enhancement in correlation was observed by removing the suspended solids in samples using filtration. However, statistical multiple regression methods, using fluorescence intensity from each peaks and light scattering intensity at 633nm/633nm as variables, resulted in drastic enhancement in correlations with r^2 > 0.9 for measured and predicted COD values. |