Liquid Waste Decomposition by DC Water Plasmas at Atmospheric Pressure

• Nishioka Hiroshi

• Saito Hironori

• Watanabe Takayuki

Abstract

Decomposition system of liquid waste by DC water plasmas generated at atmospheric pressure was developed. The developed water plasma torch is a DC thermal plasma generator of coaxial design with a cathode of hafnium embedded into the copper rod and a nozzle-type copper anode. The plasma torch can generate 100%-steam plasma without a commercially available steam generator. The water plasma system is a portable light-weight system that does not require any gas supply. The plasma system has high energy-efficiency since cooling water is not needed. Methanol or ethanol used as model substances of liquid waste was mixed with water for plasma supporting gas. Rapid and complete decomposition for these alcohols produce H2, CO, and CO2 in the decomposed gas. The decomposition rate as well as the decomposition mechanism was determined by gas chromatography and mass spectrometry. The water plasma system can be used for industrial application of liquid waste decomposition.

Journal

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 33 (3), 691-694, 2008

  The Materials Research Society of Japan

Keywords

• water plasma
• thermal plasma
• atmospheric pressure plasma
• hydrogen production
• waste treatment

Details

• CRID: 1390002184882354688
• NII Article ID: 130007809528
• DOI: 10.14723/tmrsj.33.691
• ISSN: 21881650
• ISSN: 13823469
• Web Site: https://www.jstage.jst.go.jp/article/tmrsj/33/3/33_691/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed