人造革廢水COD光電檢測裝置設(shè)計
[Abstract]:Aiming at the defects of COD (chemical oxygen demand) traditional chemical method, such as cumbersome operation, easy to produce secondary pollution and so on, and combining with the industry background of dense leather enterprises in Zhejiang Province, large discharge of production wastewater and high concentration of water quality COD, etc. In this paper, the 282nm characteristic wavelength method with high detection speed and accuracy is applied to the determination of COD in artificial leather wastewater, and a set of equipment is designed to realize the automation of its detection. In addition, the COD prediction model of the device is calibrated by ultraviolet spectrum instead of the traditional chemical method, which can quickly protect the environment and further improve the reliability of the device. The device has low operating cost, high detection accuracy and is suitable for popularization in enterprises. The main contents of this paper are as follows: 1. The research results of water quality detection system at home and abroad are introduced, and combined with the traditional COD measurement method, the detection based on characteristic wavelength method is discussed. Feasibility and significance of designing COD photoelectric detector for artificial Leather Wastewater calibrated by Ultraviolet Spectroscopy .2 Design a set of COD photoelectric detection device for artificial leather wastewater, which is mainly composed of optical detection system, sampling and treatment system, Electric control system PLC control system is composed of four parts. According to the inspection requirements, the components selection and combination of the optical inspection system, the device design and mechanical construction of the sampling and processing system are completed, and the control of the optical detection and the waterway flow through the electrical control system is realized. On this basis, the software and hardware design of PLC control system is completed. Finally, the software of PLC system is debugged and simulated, and it is verified that the device can be operated automatically. 3. The waste water samples from several different artificial leather enterprises in Wenzhou, Lishui and other places will be divided equally by different proportions of dilution, and the national standard method will be used respectively. The COD chemical value, absorption peak area and absorbance were measured by UV scanning and the characteristic wavelength of the device. According to the obtained data, two groups of prediction models were established, and the accuracy of the model was tested by using ultraviolet spectrum method instead of chemical method to calibrate the COD prediction model of this device. In this paper, 16 samples of artificial leather waste water were detected by using two prediction models and the results were compared with the national standard method. The error was not more than 5, which indicated that the two models had high accuracy. The detection results of this device are reliable. 5 the absorbance of other industrial wastewater COD is detected by the characteristic wavelength of the device, and the conclusion that they have good correlation with the chemical value of COD is also obtained. The influence of temperature, turbidity and pH on the absorbance detection of the device is studied. Finally, the performance indexes of the device, the possible causes of the error and the place to be improved are put forward.
【學(xué)位授予單位】:中國計量學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:O657;X832
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