Abstract
Summarized are the actual field investigations, which include the advection and deposition of drying components and acidification of the environment, and the air purification technology using activated carbon fibers (ACFs). The air purification technology using ACFs regards natural wind or air flow as the driving force without electric energy. Some 1,000 fundamental experiments have already been implemented for evaluating the ACFs. However, it was difficult to prove in the field any technology established in laboratory experiments. The reason is that the temperature / humidity or wind direction/speed of the outside air is always changing and a wide variety of gases and aerosols are mixed together. In order to put the ACFs into practical use, it is required to reduce the production/running costs, simplify the handling operation and produce a high performance as opposed to previous issues. It is also necessary to take into consideration the ACF regeneration technology after using it and decrease the life cycle CO2 emissions. Most of the above mentioned matters were generally understood. Meanwhile, some related technologies are being investigated. The air purification technology using the ACF will be described in the majority of general remarks and its development process explained, along with the current excellent results and future prospects.
