| The treatment and discharge of oily sludge has attracted more and more attention of enterprises and environmental protection departments,so it is very important to find a fast and green method to determine the oil content of oily sludge.The results show that the oil content of oily sludge is above15.2% before treatment,and 86% after treatment is below 8%.On this basis,the high temperature extraction reduction method was analyzed.The results showed that when the oil content decreased to below 9.16%,the oil content measurement error increased significantly,and the maximum relative error of oil content was 31.24%.The conclusion proved that the high temperature extraction reduction method,as a traditional oil content measurement method,was difficult to accurately determine the oil content of oily sludge with low oil content.In order to solve the above problems,high temperature extraction dic（digital image colorimetry）was applied to the field of oil content measurement of oily sludge for the first time,and VDB（blue deviation）was proposed as a parameter to describe the concentration of oil solution for the first time.The experimental results show that when VDB is greater than 20,the concentration of oil solution is low,and the linear relationship between b value and concentration is good;When VDB is less than 20,the concentration of oil solution is higher,and the g-curve linearity is better.The results show that the VDB value has a good discrimination for defining the concentration region of oil solution,and can be used for crude determination of oil solution concentration and targeted determination of different concentrations of oily sludge extract according to the concentration.In order to optimize the use conditions of the above two curves,this paper explores the test conditions of DIC.The experiment shows that the best light source is 10 W LED strip light source and the best shooting angle is 30 °、 The results showed that the best shooting distance was 30 cm,the best sensitivity was 200,the best exposure time was 1 / 200 s at low concentration,and the best exposure time was 1 / 50 s at high concentration,and the best beat balance value was 6500 K.under these conditions,high temperature extraction DIC was analyzed and tested.The test results showed that the correlation coefficients of standard curves in high concentration area and low concentration area were more than 0.99%,the recoveries in low concentration area were 97.0%-104.5%,and the recoveries in high concentration area were 96.1%-104.9%,indicating that the method had high accuracy.High temperature extraction DIC can solve the problem of insufficient accuracy in the determination of low oil content samples in traditional oil content testing methods,and effectively avoid the interference of water content in samples.However,high temperature extraction DIC still has the problems of large amount of organic solvent,high energy consumption and long time consuming.Through the solvent recovery experiment to determine the feasibility of solvent recovery,and ultimately solve the problem of large amount of solvent.In order to solve the problem of energy consumption and efficiency,low temperature ultrasonic DIC was applied to the field of oily sludge oil content test for the first time,and the method was analyzed and tested.The experimental results show that the whole test process of this method only takes 30 min,the amount of solvent is 33.56 ml,the time is saved by at least 9.5 h compared with high temperature extraction reduction method,and the amount of solvent is saved by 56.44 ml,The purpose of fast and green test for oil content of oily sludge is achieved.Through the parallel determination experiment of standard samples,the average relative error of54 groups of samples is 3.2%,which indicates that the accuracy of the method reaches the actual test standard.Finally,high temperature extraction DIC is suitable to guide the treatment of oily sludge in the laboratory,while low temperature ultrasound DIC is suitable for the on-site detection of oily sludge treatment in the factory,and is expected to participate in the on-line real-time monitoring of oily sludge treatment in the factory. |
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