Proposal for Novel Treatment Technologies and Management Systems of Laboratory Wastes

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The objective of this study is to evaluate the feasibility of such waste treatment technologies as "supercritical water oxidation (SCWO)" and "biochemical degradation", as an alternative method to conventional calcination process for the treatment of laboratory wastes in universities. The outreaches of this project are summarized as follows.1. Laboratory wastewater treatment was carried out with the aid of SCWO facility in Kashiwa Campus, The University of Tokyo. The results suggested that the wastewater that consists of simple organics including chlorinated compounds can be completely destructed without the problems of dioxine formation and corrosion.2. An SCWO compact sized reactor was designed for the purpose of on-site treatment of laboratory wastewater. It was experimentally confirmed that the major chemical species in laboratory wastes were successfully decomposed using the SCWO compact reactor.3. The degradation ability of hazardous organic chemicals by cytochrome P450-producing … More bacteria, Rhodococcus sp. strain EP1 and Gordonia sp. strain EP4, was investigated. A possibility exists that the bacterial P450s are potential tools in the degradation of hazardous organic chemicals in waste water. A dichloromethane (DCM)-degrading bacterium, Ralstonia metallidurans PD11, was immobilized in a polyvinyl alcohol (PVA) gel to use in a bioreactor for DCM treatment. The PVA gel-immobilized cell of R. metallidurans PD11 is thought to be a prospective candidate for bioremediation to eliminate DCM from drainage water from research laboratories.4. It was experimentally confirmed that Iron-Oxidizing Bacterium, Asidithiobacillus ferrooxidans Strain MON-1 is a highly mercury-resistant strain and that its mercury volatilization activity is remarkably strong. Besides, an electrical cultivation device was made to get this strain into a high concentration in a small amount of culture medium. These results suggest that the cultured bacteria can be used for soil purification or wastewater treatment through volatilization and recovery of mercury selectively from mercury-polluted soil and wastewater. Less