Development of Artifical nose for the detection of swine facility odors

• Main Authors: Chang-wen Chi, 紀長文
• Other Authors: Andrew C. Y. Fei
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/17557098290732500292

碩士 === 國立臺灣大學 === 獸醫學研究所 === 89 === In the recent years, people pay more attention to the environment impact of swine facility due to the high education level and environment protection knowledge. According to US Environmental Protection Agency report that the high concentration of noxious gases ( such as Hydrogen sulfide, Carbon dioxide, Ammonia etc.) in the swine facility would cause person to breathe irritatively breathing. The noxious gases is also reported as one of the factors that caused to the death of hogs. More and more statistic data shows that the odors nuisance has become the major environmental problems in Taiwan. In order to solve the argument, an artifical nose study was conducted to detect and estimate the noxious gases in the swine facility. In this study a sensor system was employed to detect different gaseous odorants. The system consists of an array of six sensors in which different biological materials ( DH31, TN, HAC01, A1N, A5N, P1) were coated onto the surface of piezoelectric electrode. The principle theory of this study is when the specific gas is sorbed onto the coated material, the increased mass will reduce the resonant frequency of the crystal. By monitoring the change in the resonant frequency, the specific gas can, thus, be quantified. 135 samples were tested from 127 swine facilities and 8 laboratories in 8 counties from September, 2000 to May, 2001. there is good validation data of sensors sensitivity and reproducibility test. the detection range of Ammonia, Indole , Hexanoic acid and Toluene range from 0.001 to 100 ppm, and 0.01 to 100 ppm for Skatole. The response time is about 350 seconds. The test results indicate that the sensor of CH1,CH3 and CH4 receptor have significant changes of the resonant frequency in 127 swine facilities. Those changes are classified to be the degree 3 and degree 4 of odors level, compared by the method of human olfactory detection system (Olfactometry), We checked coated marterial of those sensor receptors and find out that the swine facility odors consist of Amines, Mercaptans and Organic acid. The array of six sensors form an unique fingerprint for each compound which could be used to identify different odorants. We believed that using artifical nose to monitor the odour problems in swine facility, will become handly method in the near future. Although, sensor lifetime, desorption and biological molecules analogues problems need to be improved. Many applications should be easily accessible with the piezoelectric biosensor since it offers relatively low cost, real-time output, and experimental simplicity. As piezoelectric detection systems are optimized to their potential uses in livestock industry.