| Summary: | 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℃.
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