Dissolved Organic Matter (DOM) Optical Property in Industrial Effluents

• Main Authors: Ming-hsien Lin, 林明賢
• Other Authors: Ting-Chien Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/32882544177587863758

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 100 === Dissolved organic matter (DOM) originates from a variety of sources, impacts distribution, absorption, transport, and biotoxicity of organic pollutants, and plays an important role in biochemical cycles in an aquatic environment. Fluorescence spectroscopy is a sensitive technique, which is used to track the movement of natural and synthetic DOM in ocean and freshwater. The wastewater effluent DOMs (EfOM) of a steel plant (P1), a panel plant (P2), a resin plant (P3), a chemical fiber plant (P4), and a sewage treatment plant (P5) were analyzed in this study with UV/vis and fluorescence spectra to detect absorbance and excitation-emission matrix (EEM) of EfOM samples. The UV/vis and fluorescence spectral indices, percentage of fluorescence region integration (FRI), and correlations of each index were examined in order to find out applicability of an optical index for the different EfOMs. The results show specific ultraviolet absorbance at 254 nm divided DOM carbon concentration (SUVA254), used as a tool to determine molecular size and extent of humification, are applicable to EfOM of P1, P2, P4 and P5. The similar fluorescence spectra of each EfOM sample had closer FRI percentage, which suggests FRI is a suitable way to analyze fluorescence spectra. In this study, EfOMs of P1, P2, P4, and P5 are similar in chemical composition and structure of DOMs generated by microbial or bacterial in water; however, the EfOM of P3 consisted of non-microbial DOM when compared to fluorescent indices of raw, retentrate, and permetate solutions. Considering UV/vis index, the values of ratio of absorbance at 250 nm and 365 nm (E2/E3) were negative and the inverse proportion to DOM molecular weight did not exist. Regarding the distinguishing type of DOM in EfOMs, the integrated peak location with its regional integration percentage is a more complete judgment. The comparison values of the slope of the 275-295 nm absorbance region (S275), the way to determine DOM molecule size in EfOM of P1, P2, P4, and P5, were consistent with Helms’s (2008) study results. Based on value of SUVA254, the index of absorbance integral area from 250 nm to 450 nm (A250) in three kind solutions shows significantly positive correlations with values of SUVA254 that is applicable in determining molecule size and hmuification of industrial EfOM. The biological index (BIX) values in original and penetrate solutions showed significant positive correlation with SUVA254.