Survey of Total-VOCs, H2S, and NH3 Concentration in the Atmosphere of a Municipal Wastewater Treatment Plant in Southern Taiwan

• Main Authors: Kuan-Neng Wang, 王冠能
• Other Authors: Lien-Te Hsieh
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/01359096634851836371

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 100 === In recent years, wastewater treatment plants have played a vital role in controlling water pollution. As more wastewater treatment plants are successively built in various cities and counties of Taiwan, one after another, odors and pollutants, such as t-VOCs, H2S, and NH3, are naturally diffused with mists of water treatment, and have become a considerable issue. In particular, H2S and NH3, which are defined as toxic pollutants in the Air Pollution Control Act, can cause negative effects on olfactory and the health of operators of operators of wastewater treatment plants and adjacent residents. Consequently, a survey was conducted on the gas concentration of t-VOCs (TVOC), H2S, NH3, and LEL (Lower Explosion Limited) in one of the municipal wastewater treatment plants in southern Taiwan. First, by using portable gas detectors to measure and monitor the concentrations in 16 points that belong to various process units in the plant, we determined that the average concentration of t-VOCs under wastewater inlet well cover (403.35ppm) and sludge digester cover (1638.20 ppm) are relatively higher than the concentration above wastewater inlet well cover (2.93 ppm) and sludge digester cover (9.02 ppm). Second, by using SPSS to analyze the correlation coefficient, we discovered that the concentration values among gases are significantly correlated ( p < .01). The correlation coefficient of H2S vresus t-VOCs, LEL versus t-VOCs, and H2S versus LEL are 0.969, 0.969 and 1.000, respectively. These results indicate that a high concentration of t-VOCs results in that of H2S and LEL. The results of our research also show that the measured values of various gases in the targeted municipal wastewater treatment plants lower than the standards of regulation (t-VOCs<150 ppm、H2S<0.1 ppm、NH3<1 ppm).