Topics of Environmental Activities
An explanation about our environmental activities that we especially emphasize.
- Reducing water use in etching equipment
- Recycling of Hydrochloric acid
- Cascade use of waste heat
- Automation of free cooling
The treatment method for wastewater from rinsing tanks for etching equipment depends on how dirty the water is.
The Arai Plant checked the dirtiness of all the water for its etching equipment and reconsidered the treatment methods for the wastewater. The results showed that the wastewater from two rinsing tanks was recyclable. Accordingly, the plant connected piping to recover the wastewater and feed it to pure water production equipment for recycling. This reduced water use by an additional 7,387 m3/year.
The waste water which fulfills the conditions of "low metal composition", "low organic matter ingredient" and "acid waste water in which a fixed quantity of Free-acid which has not been combined with metal exists" was collected from the acid waste water discharged from a plating process for another piping, and it decided to utilize as a chemical for regeneration of ion-exchange resin (recycling Hydrochloric acid).
By having developed the regeneration processing method which uses the original acid waste water of our company, the amount of purchase of the Hydrochloric acid used for ion-exchange resin regeneration has reduced by 30%.
Moreover, the Caustic soda which neutralizes the waste Hydrochloric acid discharged after ion-exchange resin regeneration has also been reduced by 25%.
Although heat was radiated to the outside air after sending the waste heat which comes out of a production facility to the cooling tower as it was cooling conventionally. But in TAKAOKA new building, waste heat is not simply thrown away, the outside air is warmed in winter, and it is reusing to heating.
Thereby, the steam which was being made for warming of the outside air has been reduced by 25%.
Moreover, since the temperature of the waste heat sent to a cooling tower by outside air heating falls, the re-cooled energies are also reduced.
Up to now, stop the refrigerator to make the air-conditioning and production for cold water in winter, we introduced the outside air cooling equipment incorporated into the direct indoor cooling and free cooling to build a cold water to cool the water using cold outside air.
However, since the man-hours it takes manually switching the piping system, we have implemented only the middle of winter the temperature drops by day and night continuously, but in TAKAOKA new building, it was made to be switched always automatic.