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Author(s): |
ChengBin Xu, School of Environmental Science, Liaoning University, Shenyang 110036, China
Xuelian Meng, School of Pharmacy Liaoning University, Shenyang 110036, China
XiPing Ma, School of Environmental Science, Liaoning University, Shenyang 110036, China
BaoRong Fu, School of Environmental Science, Liaoning University, Shenyang 110036, China
LiHong Zhang, School of Environmental Science, Liaoning University, Shenyang 110036, China
XiuJuan Hui, School of Environmental Science, Liaoning University, Shenyang 110036, China |
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Abstract: |
Three-dimension excitation emission matrix fluorescence spectroscopy(3DEEM) was used to investigate changes of fluorescence characterization of dissolved organic matter (DOM) in eutrophic water by treatment with three different compound vertical flow wetlands(CVFW). Comparing the effect of plant composition and substrate on DOM， and analyzing the sources of DOM in eutrophic water. The results showed : (1) All the samples were analyzed in the study, two fulvic-like and two protein-like were characterized, and the fluorescence peak of visible fulvic-like (marked M), UV fulvic-like (marked A), and tyrosine-like(marked S) were clear, the fluorescence peak of tryptophan-like was not clear. (2) Decreasing rate of fluorescence spectrophoto- metric of fulvic-like from water samples by treatment of three different CVFWs: CVFW-1 ＞ CVFW-2 ＞ CVFW-3, Decreasing rate of fluorescence spectrophotometric of protein-like from water samples by treatment of three different CVFWs: CVFW-2＞CVFW-1＞CVFW-3. It appears the different substrate and plants would have a significant impact on the purifying effect of constructed wetlands: Gravel better than shale; the combination of Cyperus alternifolius and Canna generalis. Better than the combination Juncus effusus L. and Acorus calamus Linn. This is the reason the purifying effect of CVFW-1 and CVFW-2 were better than the purifying effect of CVFW-3. (3)The values of f450/500 ranged from 1.674 to 1.796, r(S，M) ranged from 0.734 to 0.834, r(A，M) ranged from 1.396 to 1.465. By analysising these parameters of DOM, it is possible that dissolved organic matter in the water is relatively simple structure, its comes mainly from the life of phytoplankton and microbial activity or the residue decomposition.
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