Release: December 9, 1999
NGK Insulators, Ltd. (President: Masaharu Shibata, Head Office: Nagoya) has developed a water treatment system that effectively decomposes and removes chemicals like dioxin.
In July 1999, the Japanese Diet approved a bill to reduce dioxin emissions and a dioxin control law is expected to become effective in January 2000. The Environment Agency has proposed water quality standards for dioxin which limits contamination to 1 picogram (one-trillionth of a gram) per liter in rivers, streams, lakes, marshes and sea water; and 10 picograms per liter in the waste water of refuse-incineration facilities and final disposal spaces. When the law becomes effective, Environment Agency officials will be empowered to inspect facilities and demand documentation.
The newly developed water treatment system is attached to catalyzer-ozone equipment for dioxin removal. This equipment is constructed with a reacting tower filled with catalyzer and a ozone generator that produces ozone from oxygen in the air. The catalyzer - manganese dioxide -is brazed onto a porous ceramic substrate. Active radical species produced from ozone are dissolved into the waste water and oxidize and remove the dioxin group.
NGK's goal in the near future is 5 billion yen in annual sales of landfill leachate treatment system at waste disposal facilities. Furthermore, we will expand business into systems for the removal of microdose toxic agents such as dioxin, environmental hormones and COD's in sewage and industrial liquid waste.
cutaway of catalyzer-ozone equipment for dioxin removal