Development of novel on-site treatment system for medical solid wastes using supercritical water oxidation

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The objective of this project was to obtain the fundamental engineering information on the on-site treatment of infectious medical wastes by supercritical water oxidation (SCWO). The outreaches of this project are summarized as follows.1. For the degradation of polypropylene and disposable diapers, chosen as model medical supplies, the dependence of conversion on the reaction conditions (temperature, pressure, oxygen concentration) was experimentally investigated using a small batch reactor. As a result, it was demonstrated that these materials can be completely destructed Within 15 minutes of reaction time at 450℃ and 25 MPa.2. The reaction progress of plastic degradation was directly observed by means of shadowgraph imaging.3. It was experimentally confirmed that E.Coli DH5α,a model infectious substance, can be completely destroyed under supercritical water condition.4. Supercritical water oxidation of methylamines was studied in order to obtain the basic kinetic information of nitrogenous organic compounds.5. A semi-batch reactor system for the on-site treatment of infectious medical wastes was designed, taking the problems of corrosion and safety into consideration.6. Interviews With several hospitals and medical institutions were carried out and the feasibility of this system was discussed.