Ethylene Oxide Removal from Wastewater for Reuse

• Main Authors: Chin-Wen Yeh, 葉金文
• Other Authors: Ho-Shing Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/22658445372595509947

碩士 === 元智大學 === 化學工程研究所 === 86 === The sorption behaviors of ethylene oxide (EO) in wastewater using the adsorption and stripping methods were stadied. Because EO in wastewater appear a lot when the factory operate abnormally, microorganism dies instantly and the capability of wastewater treatment decreases. Hence, removing EO from wastewater is necessary.The subject of this research is to stady the physical and chemical properties of EO in wastewater, and mass transfer and equilibrium of EO between wastewater and air using the adsorption and stripping method. 1. In adsorption, the removal of EO was measured by four adsorbents (XAD4,XAD7,XAD8,XAD16). The sequence of the removal of EO for adsorbents was XAD16>XAD4>XAD8>XAD7. The removal capability of EO for XAD16 is 12.3mg/g XAD16 at 10℃. This result is not good. 2. In stripping method, two operating type, semi-batch and continuous packed bed, were conducted in this work. Temperature, airflow, and packed material were evaluated to obtain the optimum sorption condition. The high airflow rate and the high temperature were favorable to increase the stripping efficiency. 3. According to experimental result, the liquid mass-transfer coefficient KL* and gas mass-transfer coefficient KG* in a aqueous/air semi-batch stripping experiment were calculated. These parameters can offer to scare up the removing process of EO by stripping method. 4. In general, acidity agent added this removing system can increase the absorption and the absorption efficient in a stripping tower. The high concentration of acidity agent is of high absorption efficient. H2SO4 and HCl which cheap were carried out in this work to test the absorption of EO. The absorption capability of EO for H2SO4 and HCl was high. However, the absorption capability of EO for H2SO4 was better than that for HCl. 5. We used several absorbed liquid to absorb the EO in the wastegas treatment 500mL 1M HCl（aq）to remove EO from the wastegas. By counting the experiment data, we find 500mL 1M HCl（aq）can absorb about 10g EO at 70℃.