This paper describes the technology development by which biomass is produced by treatment of pollutants using microalgae, and is recycled. A bioreactor system has been developed, in which microalgal biomass can be obtained through the effective treatment of CO2 and NOx using microalgae having ability of increase under the severe condition with simultaneous flow of CO2 and NOx. A new method has been also developed for separating and recovering the microalgae. Materials, such as glucose, glycerol, acetic acid, and lactic acid, were produced from the obtained biomass through physico-chemical and biological treatments. These materials can be converted into ethanol and hydrogen. For this treatment and recycling system, functions as a part of natural material recycling were considered to be most significant. Development of an analysis and evaluation method of an impact of this system on the natural environment is also tried. 1 fig.
Miyamoto, K; Nasu, M; Hashimoto, C; Tanaka, K; Hirata, M;  Fujita, M; Takagi, M;  Hirata, Y; Taya, M;  Yamanishi, H 
- Osaka University, Osaka (Japan). Faculty of Pharmaceutial Science
- Osaka University, Osaka (Japan). Faculty of Engineering
- Osaka University, Osaka (Japan). Faculty of Engineering Science
- Osaka University, Osaka (Japan). Faculty of Medicine