From April of this year, Daifuku Kogyo engaging mainly in the construction business in Shimane Prefecture and the neighboring regions started the CO2 PSA business utilizing the natural zeolite of local origin as an adsorbent which was extracted by itself, and has already succeeded in sales to several strawberry and tomato producing farmers. The utilization of CO2 to promote photosynthesis generally depends on a supply from cylinders or the generation by combustion of kerosene. This case of Daifuku Kogyo is the first attempt to utilize PSA.
　
Daifuku’s PSA which takes in CO2 from the air has a structure to raise the concentration of CO2 up to about 4,000ppm before discharging which is a concentration 10 times as high as the ordinary 400ppm in the atmosphere.
With the promotion of photosynthesis using the generator the crop of strawberry is expected to increase by 35% approximately. According to the company, it is possible to introduce the PSA generator at the same cost as that for 7 to 8 years of adopting the conventional method by burning of kerosene. Among the zeolite minerals, those which have adsorptive effects are called ferrierites, being purified artificially in many cases. Natural ones are produced only in some part of the Tohoku District and in Shimane Prefecture.

The company has long been engaged in mining and selling of natural zeolite other than the ferrierite group for the purpose to mix with fertilizers for agricultural or livestock use, and has taken advantage of the knowhow for mining and selling of natural ferrierite as a new business since 3 years ago when it started mining. The extracted ferrierite is pulverized from the form of rocks in its own plant and supplied to the PSA manufacturer consigned for production.