Abstract
The dissolved organic matter (DOM) in the tail water of the municipal wastewater treatment plant (WWTP) are complex and changeable, and can react with the organic and metal ions in the receiving water, thus affecting their migration and transformation. In order to understand the characteristics of DOM in the tail water of WWTP, the Guozhen WWTP and Kui river in Xuzhou city were taken as the research objects. The spectral characteristics of DOM were analysed by three dimensional fluorescence spectroscopy (3D-EEM), and the water quality indexes such as pH, total nitrogen (TN), ammonia nitrogen (NH3 −-N), nitrate nitrogen(NO3 −-N), nitrite nitrogen(NO2 −-N), TOC and UV254 were measured. The changing rules of these indexes in sewage, tail water and receiving river were discussed. The results showed that DOM in the tail water was mainly composed of soluble microbial metabolites and humic acids. The TN, NH3-N, NO3 −-N, NO2 −-N and TOC have been significantly reduced under the biological treatment process of the WWTP, but the large-scale drainage of the tail water will still have no negligible influence on the natural waterbody.
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