The Determination Of Dyeing Wastewater By Snapshot Imaging Spectrometer

Printing and dyeing textile industry can promote the development of China's economy,but at the same time will discharge a large number of printing and dyeing wastewater,which are harmful to the water environment.The composition of dyeing wastewater is complex,and the wastewater is extremely difficult to deal with.The rapid detection of printing and dyeing wastewater is a challenge of our water quality testing technology.The snapshot imaging spectroradiometer is able to obtain a 3D spectral dataset of a target within the time of a shutter's time,thereby rapidly detecting the target based on spectral information.In this paper,we use the self-developed snapshot imaging spectrometer to establish an accur ate,fast,simple and field-detectable detection method for printing and dyeing wastewater.The detection method in this paper is based on spectrophotometry.T he instrument has excellent image acquisition performance,fast spectral recovery ability and th spectral resolution was better than 11 nm at 532 nm.It was also proved that the instrument can be used for the detection of liquid samples.Then the Rhodamine B was selected as the object of study,the detection conditions were optimized,and the detection light source suitable for different application scenarios was determined.At the same time,the sample cell was also designed.The single factor analysis of variance showed that the background light had no effect on the detection.After that,the simulated printing and dyeing wastewater was tested.For single component simulated wastewater,the standard curve of orange G and Rh B was established at the range of 0-50 mg/L by using white light LED array as a test source.The detection limit of the rapid detection method was 0.837 mg/L,and the recoveries of single component Rh B and Orange G wastewater was 93%-113% and and 102%-104%,respectively.And the relative standard deviations(RSDs)were 5.2% and 1.3%,respectively.The error of direct detection of mixed wastewater was higher,and the absorption spectra collected by UV-2550 showed that the spectrum of wastewater was shifted.Then the detection model of mixed component printing and dyeing wastewater was established by multiple linear regression combin ed spectrophotometry,which reduced the relative error of measurement significantly.In the experiment of monitoring the decolorization process of dyeing wastewater by snapshot imaging spectrometer.The reaction system of granular activated carbon adsorption and Fenton reagent oxidized Rh B wastewater was designed.The standard curve of Rh B wastewater was established under laboratory conditions,and the liner range is 0.5-10 mg/L.The correlation coefficient was better than 0.99.With the adsorption of Rh B wastewater by activated carbon,the change of the spectrum in the range of 500-550 nm was monitored.And the effect of the active carbon intake on the adsorption effect is explored.T he dosage of activated carbon has a direct impact on the adsorption effect.In the Fenton reagent oxidation experiment,the reaction was very fast,and the decolorization process of waste water was monitored by snapshot imaging spectrometer used continuous sampling mode.The decolorization rate of wastewater was 90.68% under 5 m L/L hydrogen peroxide dosage.