|June 4 1997||Yashiro Plant obtained certification.|
|Nov. 28, 1997||Yashiro Plant and Ikeda Office established the total integrated system and obtained an extended ISO14001 certification from Japan Quality Assurance Organization (JQA). This is the 12th certification in Ricoh group.|
|June 23, 2000||Shin-Yokohama Office and RICOH System Center including the design section obtained ISO14001 certification from JQA.|
|Feb 9, 2007||Integrated Certification obtained as RICOH|
|Certification body||JAPAN QUALITY ASSURANCE ORGANIZATION|
The Yashiro Plant, at which produces semiconductors, introduced a hydrofluoric acid recycling system. This is the first system in the world that recovers hydrofluoric acid by using a crystallization method to turn the acid into fluorite, which can be reused to make hydrofluoric acid again. This system requires less space than the existing macro-molecule coagulant system and enables the generation of artificial hydrofluoric acid of at least 90% purity that can be recycled as chemical ingredients.
Hydrofluoric acid is a chemical substance used in the etching process in semiconductor manufacturing. In the past, this substance was properly processed as sludge, but the introduction of the acid recycling system resulted in zero waste at a higher level by circulating the substance for recycling. This system contributed to modifications in the existing wastewater processing device, resulting in significant energy conservation. The New Energy and Industrial Technology Development Organization " NEDO " approved a subsidy of this technology because of its innovation and energy conserving capability.
In 2004, the advanced fluorine adsorption system was installed after the process of the hydrofluoric acid recycling system to further reduce the concentration of fluorine in the drain water. The water processed by the advanced system is returned to the previous recycle system to recover fluorine, which contributes to recycle resources.