JAPAN TAPPI JOURNAL
Online ISSN : 1881-1000
Print ISSN : 0022-815X
ISSN-L : 0022-815X
Energy Saving I
Fuel Gas Production from Organic Wastewater by Hydrothermal Gasification Treatment Using Catalyst
Nobuyuki Matsumoto
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2017 Volume 71 Issue 6 Pages 598-604

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Abstract

The new technology that can utilize the potential energy contained in organic wastewater is required in the terms of the prevention of global warming.

The hydrothermal gasification process for the wastewater containing organic matter in high concentration was developed and commercialized by Osaka Gas. In the hydrothermal gasification process, the organic matter contained in wastewater is decomposed at high speed and converted into the gas such as methane that can be utilized as fuel in the catalytic reactor under the condition of sub-critical water. The application of the hydrothermal gasification process to the wastewater conventionally treated by incineration because biological treatment cannot be applied enables the energy recovery, CO2 emission reduction and treatment cost reduction.

The catalyst possessing high gasification activity in sub-critical water was developed. The process was developed by the laboratory scale and bench scale test. The decomposition characteristic of the typical organic matter contained in wastewater and the treating condition of the simulated or actual wastewater was clarified by the test.

The pilot plant was designed and installed in an actual factory. The performance of the hydrothermal gasification process was verified by the operation of the pilot plant for about 8,000 hours. The organic matter concentration of the treated water was maintained in low level and the generated gas composition was enough stable to be used for boiler fuel. The pilot plant has being in operation as the actual treatment plant for the factory after the demonstration test. The accumulated operation time of the plant is now more than 33,000 hours.

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© 2017 Japan Technical Association of the Pulp and Paper lndustry
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