| With the rapid development of economy in our country, the scale of printing and dyeing industry enterprise is becoming larger. And printing and dyeing industry is typical high water consumption, energy intensive and highly polluting. The amount of printing and dyeing wastewater is one of the largest one in industrial waste water in China. It is characterized by the high chromaticity, high organic matter content, complicated components, especially containing different kinds of teratogenic, carcinogenic substance. And it is also the difficult biodegradation toxic wastewater. Because of illegally wastewater discharge, the printing and dyeing enterprises often cause serious water pollution and water environment security.Three-dimensional fluorescence is applied more and more in the water quality monitoring of natural water bodies and sewage water because of its high sensitivity, fast test, clearly showing the composition of organic matter in water, less secondary pollution, and many other advantages.To study the three dimensional fluorescence characteristics of printing and dyeing wastewater, the printing and dyeing wastewater of three different treatment plants was chosen in this study in the south of China where dyeing and printing enterprises are concentred. The results showed that the three dimensional fluorescence characteristics of printing and dyeing wastewater from the three treatment plants is a clear similarity, i.e., all containing 280/310 nm and 230/340 nm fluorescence peak with different fluorescence intensity. The fluorescence intensity of waste water in A treatment plant is the highest while it is equal in B treatment plant and C treatment plant. The ratio of two fluorescence intensities is also different. The ratio A treatment plant is 0.62~0.73, B is 0.58~0.66 and C is 0.41~0.47. The ratio of different fluorescence peak intensity also showed the differenct organic components in three wastewater. Based on the comparison of the three dimensional fluorescence spectra, the main fluorescent pollutants in printing and dyeing wastewater were checked, and the fluorescent substance was found to come mainly from the dyes widely used in the dyeing and dyeing process.The relationships between three-dimensional fluorescence characteristics of printing and dyeing wastewater and the routine monitoring parameters of wastewater was also studied. The results showed that the correlation coefficient between the fluorescence peak intensity and the water quality parameters COD, TN and ammonia nitrogen from A and C two plant is small, i.e. among 0.0034~0.1903,while the one from B plant is positively related, i.e., amon,0.8002~0.9287. So in the different printing and dyeing wastewater from different raw materials and production process, the relationship between a single routine water quality monitoring parameter and the fluorescence peak of fluorescence intensity is not obvious. Different sampling point of the samples respectively with a concentration of an upward trend while doing linear fitting in the same coordinate diagram, in the coordinate space was separated by, so it is provided data basis to determine sources of printing and dyeing wastewater.The study showed that printing and dyeing wastewater has obvious unique three-dimensional fluorescence characteristics, stable signals. The three-dimensional fluorescence characteristics can be used as the basis for the early warning, discharge and identification of pollution sources of the printing dyeing wastewater drainage. |
