| abstract |
(57) [Problem] To sufficiently purify even a low concentration of a nitrogen compound, a phosphorus compound, a metal ion, an organic substance and the like. SOLUTION: The light source 1, a carrier 2 for attaching photosynthetic bacteria and / or cyanobacteria, and a container 3 for accommodating a fluid to be purified are contained at least in the container 3. The fluid is purified by the metabolic action of photosynthetic bacteria and cyanobacteria attached to the carrier 2. |